DEI0007415MA - - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

Registration date: June 30, 1953 Published on September 6, 1956

GERMAN PATENT OFFICE

The invention relates to a circuit arrangement for central control devices that each of the liaison bodies of one or more electoral levels in telecommunications, in particular Telephone systems are assigned together. Individual switches are used as connecting organs Existing multiple switches are used according to the crossbar principle.

There are already such systems with common control devices such. B. Register, known. The tasks of such a register exist after receipt by a calling participant therein, the corresponding switching order, d. H. the number of the desired subscriber receive and store. To establish the connection, the register is now used to set the individual groups and line selection levels. In such a case, the register is open during the occupied for the entire duration of the connection establishment.

The essential feature of the invention is the use of the common facilities (Register) and reduce their effort. Through a sensible division the known common control devices in individual, assigned to the respective election levels Control devices it is possible to use the

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to relieve central organs and to carry out the control processes in the individual electoral levels separately.

There is therefore a circuit arrangement according to the invention proposed which the economic advantage by relieving the central Organ (z. B. memory and marker) achieved in that a first control device is provided is, which is occupied by a calling subscriber ίο, the selection of free preselection levels and the Selection of a free register controls, and that a second and third control device is present are occupied by one by the first control device in the course of a connection Register are set, and that the second control device, the intermediate selection stages and the third control device controls the final selection stage.

The invention is illustrated in its details on an exemplary embodiment in connection with the Figures explained in more detail. Here shows

Fig. Ι a circuit for a subscriber line,

2 and 3 show a circuit for a call scanning device,

4 shows a circuit for the first call seeker,

FIGS. 5 to 7 show a common circuit for the first call seekers and line selectors,

8 to 22 show a circuit for the call seeker control;

23 to 25 show a common circuit for second call seekers,

26 to 29 show a common circuit for selecting devices for the connection sets;
30 and 31 show a circuit for a connection set (FIG. 30 shows a circuit for call seekers, which represents part of said connection set, FIG. 31 shows a circuit for the first group dialer, which also represents part of said connection set),

32 and 39 show a circuit for a register;

38 is a table showing the counting and storage relays actuated in the register in accordance with FIG represents the code number dialed by the calling subscriber,

40 to 47 in conjunction with FIGS. 13 and 19 show a circuit for group selection control,

48 and 49 show a common circuit for the first group selector,

50 shows a circuit for the last group selector,

51 and 52 show a common circuit for the last group voters,

FIGS. 53 and 60 in conjunction with FIGS. 13 and 19 a circuit for line selector control,

61 shows a circuit for a line selector,

62 and 63 the different types of pulse sources which are used for group, class and individual line identification,
FIG. 64 shows an embodiment of the evaluator as it is used in the call scanning device (FIG. 3) in order to find out a free call searcher control; FIG. -

Fig. 65 shows an example of a table. of pulse source connections for Fig. 64,.

66 shows an example of the interpreter as it is in the circuit for call searcher control (Fig. 10) is used for sampling the outputs in the call pickup device, and as an example for the pulse source connections for the evaluator,

FIG. 67 shows an example of an evaluator as it is used in the circuit for call searcher control (FIG. 18) to search for a free register, and the table for pulse source connections to the last-mentioned evaluator,

Fig. 68 shows an example of the evaluator as it is in a common circuit arrangement for the Connection set searcher (Fig. 26) is used for tapping a call searcher control, and a Table for the pulse source connections for the evaluator,

69 shows an embodiment of the evaluator for group selection and line selection control (Fig. 41 or 54) to access calling registers,

70 is a table showing an embodiment of the pulse source connections (Rdx, Rex) used for group dialer or line dialer control (FIGS. 42 and 55);

71 is a table showing an embodiment of the pulse source connections Rax, Rbx which is used for the control devices of FIGS. 18, 45, 58,

72 shows a table which shows an embodiment of the pulse source distribution Pd , corresponding to the category of the line for the connection to the subscriber terminals A and B (FIG. 5),

Fig. 73 shows in a table an embodiment of the pulse source distribution to a line within to identify a hundred-part network,

74 shows in a table an exemplary embodiment of the pulse source distribution for identifying the first group selector and the class in the first group selection level at terminals F, G and D, E (Fig. 48),

75 shows an embodiment example in a table for the distribution of the connection relays in a group selection control between common Circuits in the first, second and third group selection levels,

76 shows an overview diagram of the entire system for a local connection,

Fig. Yy to 87 an overview plan of how the individual circuit diagrams must be put together.

For the sake of simplicity in the description, the following technical terms and abbreviations are used used:

»^« - control for »call seeker control«;
»5« control for »group selection control«; »C« control for »line selector control«; . .

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"ESBO" Electronic selection and crossbar actuation for "common circuit";

VaAi-S or VaA ... for VaAi to VaA ^.

HairAIHadrA or HairA. . . for HaarA to HadrA.

In the overview diagram shown in Fig. 76:

SL a subscriber line circuit,

D a call tapping circuit,

F a circuit for first call seeker,

.S a circuit for a line selector,

L a cord connection kit,

A a circuit for call seeker control, B a circuit for group dialer control, C a circuit for line dialer control.

R a circuit for registers,

P a circuit for the last group selector, iV a common circuit for a first

Group voter,
Q a common circuit for the last

Group voter,

I a common circuit for the first call seeker,

II a common circuit for the second call seeker,

III a common circuit for the viewfinder of the cord connection kit.

As can be seen from the overview diagram in FIG. 76, every circuit diagram is a Roman one Assigned a number or a letter. Since several of these circuits have the same switching elements (tubes, Relays or relay contacts. . .) and perform the same switching functions are also the same Designations have been used for the switching elements of the schemes mentioned, and therefore the Letter or Roman numeral used where the circuits belong.

For example, VaA 1 means the tube Va ι of the principle diagram A ('»^« - control), whereas the tube VaC2 denotes the tube Va 2 of the principle diagram C (»Cx control). Relay Otrl means relay Otr of principle diagram I (common control circuit for the first caller and line selector), whereas relay Otr III denotes relay Otr of principle diagram III (common control circuit for cord set selection) and relay Otr N means relay Otr for principle diagram N (common control circuit for first group selector). Relay contact Sa 7 C means contact Sr.y of the relay SaC of the principle diagram C f "C" control).

The establishment of a connection between a calling and called party will now be described. A relayless subscriber circuit, which is shown in FIG. 1, is used here. The c-wire of each participant together with the associated resistor forms part of a hundred-part evaluator, the gates of which are controlled by the 14 sources of the groups Na, Nb and ^ Vc, as shown in FIG.

The common output terminal of the evaluator is via a tube, which acts as a cathode follower stage works, connected to the tap, which controls the call status of a subscriber line notices.

The cathode follower tube and associated circuitry is shown in Figure 5 which forms part of the ESBO for a group of call seekers and line selectors.

The call picker is shown in Figs.

Each group with 100 lines is provided with a second hundred-part group of the evaluator, the gates of which are controlled by the 14 sources of the groups Na, Nb and Nc. The combination of two of the 11 sources Nd , which correspond to the group or class or the switching state of each subscriber line in a group of hundreds, as shown in the table in FIG. 72, is connected to each of the 100 branches of this evaluator. The mentioned second evaluator is also shown in part of the “ESBO” circuit (first call searcher / line selector) in FIG. The various classes of subscriber lines and corresponding associated pulse sources are shown in the table of FIG.

When a calling subscriber initiates a connection, a voltage of around -16 volts appears on the c-wire, on which the battery voltage is -48 volts in the rest position, due to the current flowing through the subscriber loop. This voltage is fed to the individual branch of the evaluation circuit assigned to this subscriber, whereby a pulse appears at the output of the evaluator within a time unit which corresponds to the coincidence of the sources Na, Nb, Nc , which characterize the calling line and which only once in each cycle of 100 time units (4X5X5) occurs.

The common output terminal of the Aus.werters is connected to the grid of the cathode follower tube CT 11 in the first call finder / line selector ESBO (Fig. 5). The grid leads in the rest position -40 volts and is raised to -25 volts when the subscriber strobe appears at the output of the subscriber evaluation circuit. The tube CT 11 becomes conductive and the pulse is repeated without amplification at its cathode and transmitted to the grid of the tube VT 1 D in the call picker (Fig. 2). This tube is used to detect the calling pulse.

The grid of the tube VTiD is at about

- 32 volts biased by the resistor arrangement R 10 D, Rn D and the cathode via the resistor R14D to -150 volts, so that the said tube, which works as a cathode follower tube, becomes conductive. The grid current brings the grid bias to about -30 volts, while the cathode potential of this tube is about

- is 24 volts.

When the cathode of the tube CT 11 (Fig. 5) is at about -36 volts in the idle state (if it is absent

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of a participant pulse), the rectifier G 2. D (Fig. 2) is blocked.

The time pulses from the source d2, which carry a negative voltage, have a duration of 25 ^ sec and are at the end of each of the 200 / isec time units which characterize a pulse from one of the sources Na, Nb, Nc and Nd , are over given the resistor R 12 D and limited to an amplitude of 13 volts by the limiting rectifiers G 3 D and G 4 D.

These -13 volts pulses are superimposed on the -30 volt grid bias of the VT1D tube, causing the grid voltage to drop to -43 volts and the cathode potential to -37 volts.

The rectifier G2D remains blocked because it needs about 3 volts in the forward direction between the electrodes in order to become conductive.

If a positive ringing pulse is released from the cathode of the tube CT 11 (FIG. 5) in the absence of a time pulse d2 , the rectifier G 2 D can be non-conductive.

Only when the positive ringing pulse and the negative time pulse d2 at the grid of the tube VT 1 D coincide, the potential at the cathode in the tube is reduced so that the rectifier G 2 D is permeable. The cathode of the tube CT 11 (Fig. 5) is kept at a voltage of about -33 volts by the current flowing through the rectifier G 2 D ', whereas the grid of the tube Vt 1 D is negative with respect to the cathode, and this tube therefore switches off, a positive pulse of 25 / ^ sec duration appearing at the anode of this tube. This pulse is given through the capacitor CiU and the rectifier G 28 D to the grid of the tube FT ι D.

The anode of the rectifier G 28 D is biased with a potential between -125 volts and -137 volts with the aid of the voltage divider, which consists of the resistors R 31 D ₁ R 32 D ₁ R 33 D. The different tapping options at the resistor R 32 D enable the aforementioned bias voltage to be adjusted between the aforementioned limits. This bias voltage is applied to the anode of the rectifier G 28 D via the resistor R8D , to which the rectifier G 1 D is connected in parallel.

The cathode of the rectifier G 28 D is kept at rest at a voltage of -127 volts, and the anode bias is set so that the rectifier remains blocked until a positive pulse with an amplitude of more than 3 volts from the anode of the tube VTiD arrives in order to prevent that the anode output pulses of about 3 volts, which correspond to the time pulses d 2 in the absence of the call pulses, ignite the tube FT 1 D.

The call status is stored by the tubes FTiD and FT 2 D, which together with the anode grid connections form a bistable multivibrator circuit.

In the rest position the tube FT2 D is conductive and its anode carries a voltage of

- 104 volts, whereas the FTiD tube is non-conductive and its anode has a voltage of

- Has 35 volts.

The FTiD and FT.2 D tubes have a common cathode, which has a voltage of around -108 volts.

The grid of the FT 2 D tube has a voltage of around - 105 volts. In this switching state, the rectifier G 28 D is blocked, as previously explained.

As soon as an ignition pulse of sufficient amplitude appears at the anode of the tube VT1D , the rectifier G 28 D becomes conductive and the grid of the tube FT 1 D becomes positive, as a result of which the said tube ignites. The anode potential of the tube FT 1 D falls and is transmitted via the voltage divider R 24 D, R 22 D to the grid of the tube FT 2 D , which is then extinguished. The anode potential of the tube FT 2 D is raised to -3OVoIt and this increased voltage is transmitted back to the grid of the tube FT 1 D via the voltage divider, which contains the resistors R 21 D, R 23 D. Thus, the positive bias voltage on the grid of the tube FT 1 D is maintained independently of the grid pulse, so that the tube FTiD is ignited and the tube FT-2 D remains switched off as long as no memory pulse is received. The memory pulse is recorded when the call status is removed after receiving a pulse from a free "^" control, as will be explained later.

The tube CT 2 D, which is designed as a cathode follower tube, reproduces at its cathode the voltage increase which is transmitted from the anode of the tube FT 2 D. The potential at the said cathode is raised from about -90 volts to about -30 volts and thereby gives an indication of the ringing state until a memory pulse terminates this state.

As in simplified form in that shown in FIG Shown tap circuit, an evaluator is provided, which consists of resistors and There is rectifier gates, which are controlled by pulse sources and decoupling resistors, not shown to access a free "^" control. This evaluator contains so many branches how there are »^« controls.

As long as a "^" control is free, a potential slightly higher than -16 volts appears at terminal ß, which is connected to terminal p of the AMA circuit of the "^" control (Fig. 10), on the other hand, if the "^" control mentioned is occupied, the potential for example

- 40 volts, which will be explained later in connection with FIG. 11 which shows the details of the AMA circuits.

The individual gates of the evaluator are controlled by the pulse sources TVc 1-4, Nei-3, Nd 1,2,10,11. A more detailed embodiment of the said evaluator is shown in FIG. 64, whereas the associated pulse sources for each "^" control for each pair of call tappers are shown in the table in FIG. 65 ^: .

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If a »^« control is free, a pulse of around +13 volts appears on the common output line CLD of the evaluator in a time unit that characterizes the free »^« control. However, when the call picker is not in the call state, the cathode of the tube CT 2 D (Fig. 2) carries a voltage of about -90 volts. The connection point of the resistors R 53 Z), R81D is ¹ -42 volts, and the rectifier G 20 G 33 D and D are conductive and thereby take on the sampling pulses.

However, when the call picker is in the ringing state, the potential at the cathode of the tube CT 2 D is raised to about -30 volts, and the junction point of the resistors R 53 D, R81 D is raised to about -12 volts, the rectifier G 20 D and G 33 D are blocked, and the scanning pulses are transmitted unhindered to the grating of the tube VT 2 D (Fig. 3).

The positive time pulses of .25 ^ sec duration are generated by the source g? 3 at the beginning of each time unit of 200 // sec and applied to the grid of the tube VT 2 D via the capacitor C 16 D , and their amplitude is determined by the limiting rectifiers G igD and G 18 D regulated to around +12 volts.

The time pulse brings the grid potential to about -28 volts, and the superimposed sampling pulse raises this potential to about - 15 volts.

The tube VT 2 D is equipped at its cathode with a circuit for automatic biasing, which consists of the capacitor C 5 D and a resistor R82D . According to the timing pulses, which regularly occur on the grid of the tube VT2 D, the capacitor Csd is charged with a potential which is high enough to turn off the tube VT 2 D. The discharge of the capacitor C 5 Z) through the resistor R82D is balanced with each subsequent pulse by the charge of the anode current, which is caused by the brief and slight decrease in the cathode voltage with regard to the grid by the said discharge.
Since the time constant of the circuit arrangement R82D-C 5 D is much higher than the time span between two successive peaks, these anode currents only have a very small amplitude. The resulting drop in the anode potential is therefore of no significance and not sufficient to unlock the rectifier G 21 D. However, as soon as a pulse is generated by the evaluator, which indicates a free "^" control, the superimposed time pulse raises the grid voltage of the tube VT 2 D to about -15 volts, so that this tube ignites. Accordingly, a large negative pulse is produced at the anode of this tube. This pulse is transmitted to the grid of the tube CTj ₁ D via the coupling capacitor C15 D and the rectifier G21 D, which is now unlocked.

The tube CT 3 D, which is designed as a cathode follower tube, is ignited in the idle state. Your cathode has a voltage of about -31 volts. When a negative pulse is received at its grid, the tube is extinguished and its cathode potential drops. This reduced cathode potential is transmitted to the grid of the tube FT 3 D via the capacitor C 14 D.

The tubes FT 3D and FT 4 D and their associated circuits form a cathode-coupled monostable multivibrator in which the anode of the tube FTaD is connected to the grid of the tube FT 3 D via the cathode follower tube CT 3 D in between. In the idle state, the tube FT 3 D is ignited, whereas the tube FT 4 D is switched off.

The negative pulse transmitted from the cathode of the tube CT 3 D to the grid of the tube FT 3 D causes the latter to extinguish, causing the cathode bias of the tube FT a D to drop.

The tube FT aD begins to conduct and its further anode potential, which has fallen, is again transferred to the grid of the tube CT 3 D , whereby the tubes CT 3 Z), FT 3 D are extinguished and the tube FTaD is ignited. During this time, the cathode potential of the tube CT 3 D has dropped from about - 31 volts to about - 105 volts, the anode potential of the tube FT 3 D rose from about - 22 volts to ground potential, with the capacitor C 3 Z) (Fig. 2 ) has been charged and the anode potential of the tube FTaD has dropped from -36 volts to about -τ17 volts.

This switching state remains while the capacitor C14 (Z) is slowly charged via the resistor R46D , until after a delay of about 300 ", see the grid of the tube FT 3 D has reached a potential which is high enough for the said tube to unlock. The reverse process is initiated for the tubes FT 3 D and FT 4Z), whereby the initial switching status is restored.

If at the beginning of the period of 300 / fsec the cathode of the tube CT 3 D is brought to a potential of -105 volts, the rectifier G 22 D becomes conductive, and its anode, which has a potential of -36 volts through the anode of the tube FT 2 D (Fig. 2) has this potential in terms of the call state.

A current is thus tapped from the anode resistor R 80 D of said tube via the rectifier G 22 D , whereby the anode potential of the tube FT 2 D is reduced to its initial value of approximately -104 volts.

The tube FT 1 Z) (Fig. 2) is therefore blocked again. The cathode potential of the tube CT 2 D (Fig. 2) again drops to about -90 volts, with the potential of -42 volts at the junction of resistors Z ?53Z) and R81D being restored.

The ringing state is removed and the sampling pulses belonging to the "^" control device are again picked up by the rectifier G 33 D.

As already explained, the actuation causes

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of the reverse current circuit also the charging of the capacitor C 3 D (Fig. 2) and the raising of the anode potential of the rectifier G 3 D to ground potential. This means that the limiter circuit, which consists of the rectifiers G 3 D and G4D, is biased at both ends with earth potential and accordingly the time pulses d2 are prevented from reaching the grid of the tube VT 1 . This further prevents

.10 that the call given for further calls receives the pulses from the J5, S \ BO device (Fig. 5) until the capacitor C 3 D via the rectifier gate G 3 D and the resistor R 12 D a few microseconds after recovery the blocking circuit (FT 3D -FT4D) is discharged.

The capacitor C14D can then discharge to be sure that the blocking circuit is in the working position for a next call.
When a ringing condition is established, the cathode potential of the tube CT 2 D (Fig. 2) rises, as already explained, from about -90 volts to about -30 volts and is reset to -90 volts when the ringing condition no longer exists. The positive pulse is transmitted via the capacitor C ig D to the connection point of the rectifiers G 26 D, G25 D and resistor R65D . The capacitor C19D and the rectifier G26D form a differentiating circuit.

The rectifier G 26 D is conductive, its anode is at +150 volts and its cathode is connected to earth. The positive differentiated pulse, which corresponds to the leading edge of the pulse (sudden rise to +60 volts), is picked up by the conductive rectifier G 26 D.

With the negative backside at the end of the pulse (sudden drop of 60 volts) the potential at the connection point of the rectifiers G 25 D and G 26 D suddenly drops to -60 volts and thus blocks the rectifier G 26 D and unblocks the rectifier G 25 Z) . The result of this drop in potential at the anode resistor R66D of the tube FTSD is transmitted via the capacitor C 21 D to the grid of the tube FT 6 D (FIG. 3).

The tubes FT 5 D and FT 6 D form a cathode-coupled monostable multivibrator. The tube FT 6 D is conductive in the idle state, while the tube FT 5 D is extinguished in the idle state. This circuit is provided with an output cathode follower tube CT 4 D and a storage pulse gate circuit, which consists of the rectifier G 2,4 D, the resistor Ry6D and the capacitor C18D.

As soon as the negative ignition pulse is transmitted to the grid of the tube FT 6 D , the anode current of this tube drops, which also causes the cathode bias voltage of the tube FT 5 D to drop. This causes the latter tube to draw anode current. A further decrease in the voltage is therefore caused at the anode resistor R66D , which in turn is transmitted to the grid of the tube FT 6D. As a result, its anode current is further reduced, so that it will soon be switched off by the tube FT S D , whereas the tube FT 5 D is fully conductive. >

This state lasts until the capacitor C21 D is sufficiently discharged through the resistor R68D to allow the tube FT 6 D to re-ignite when the tubes are restored to their initial state after the reversal, i.e. after a unit of time (200 / isec).

The reset begins at the moment when the time pulse d? Appears at the anode of the tube _{FTz 1} D via the capacitor C 18 D and the rectifier G 34 D and then via the capacitor C21D on the grid of the tube FT6D .

It must be noted that the rectifier G 2,4 D is blocked in the idle state, its cathode is at -13 volts and its anode has a voltage of -75 volts as a result of the potentiometer R74D, Ry '5 D. Furthermore, the time pulses d 3 of approximately 36 volts amplitude cannot unlock the rectifier.

If the tube FT 5 D is conductive, the cathode potential of the rectifier G34Z) drops, its anode potential is raised by the cathode output of the tube CT 4 D , which is transmitted via the capacitor C 20 D and the charging of the capacitor C 18 D via the resistor - When R 76 caused, so that the reverse voltage at the rectifier G 34 D is reduced to zero. As a result, the time pulse d 3 is able to pass.

It must be remembered that the drop in the potential at the cathode of the. Tube CT 2 D enters at the moment when the pulse from the source d2 is transmitted through the capacitor C 16 D and the barrier multivibrator FT 3 D-FT 4 D is switched on. Exactly at this moment the pulse generating multivibrator FTS D-FT6D is switched on. On the other hand, the latter multivibrator is switched off at the following time pulse c / 3.

The positive pulse of about 39 volts amplitude, which arises at the anode of the tube FT 6 D , begins at the beginning of one time unit and ends at the beginning of the next time unit. It therefore has a duration of exactly one time unit.

This pulse is transmitted via the capacitor C 19 D and the resistor Ry 1D to the grid of the tube CT 4 D , which consequently generates the same pulse at its cathode, which on the one hand is passed on to a switch-off pulse that acts on a gate circuit, as before and on the other hand to the <"A" control, which was found free in order to occupy it.

Before the assignment of the "^" control is described, it must be noted that after the assignment pulse has been sent to the free "^" control, the tube CT 2 D and the generator for the assignment pulse PT ζ D-FT 6 D in their The rest position remains, whereas only the locking circuit FT2, D-FT4D remains in its working position during 300, asec.

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At the end of the period of 300 / tsec, this circuit is in the rest position, and after the capacitor C 3 D has released its charge, the call tap is again ready to work in the manner already described. However, before the blocking circuit has time to go into the rest position, the - »^« - control establishes a connection to the iLS'SO circuit (first call seeker / line selector), which is assigned to the call. In this case, ground potential is of Fig. 8. ( "A" - control) through normally closed contact HO 5 contact 7, the corresponding line in Figures 5, 6, 7 (first call finder / line selector) to the connection point of the rectifier G 3 D and the capacitor C 3 D (Fig. 2) given.

The ground potential prevents the capacitor C 3 D from being discharged immediately after the return to the rest position of the blocking circuit. However, as soon as the contact 7 in the ". ^" Control (Fig. 8) has opened, that is, when the calling subscriber is switched through, the said earth potential is removed and the call picker is again ready to pick up a new call.
In the free "^" control found by the call picker, the assignment takes place with the aid of the ^ AL-i circuit in FIG. 10.

So that all call pickers have access to all · >> Α « controls, these circuits are designed for simultaneous searches on the basis of time pulses.

The circuit AMA contains an electronic device for

1. the signaling of the free or busy status the »^« control to all call taps,

2. the receipt of the occupancy pulse according to the selective method, from each Rufabtreifer with regard to the signal for the free switching state is sent, and the gain this impulse and its forwarding to the tapping device in the »^« control,

3. The removal of the free switching status of the »^« control as soon as the occupancy pulse is received would.

The circuit AMA of FIG. 10, which is shown in detail in FIG. 11, contains an evaluator, which is shown in simplified form on the left-hand side and which has as many branches as there are call taps.

Each branch is connected to the output of the occupancy pulse (terminal α) of a call pickup. The pulse sources, which are used to control each branch of this evaluator, are arranged according to the N-type and selected with regard to those which are used to control the scanning of a free "A" control in the corresponding call tappers. This is done in such a way that the seizure pulse, which is sent out by any call picker, is picked up selectively by a certain "A" control after a free control device has been found, whereas it is rejected by all others.

A more detailed version of such an evaluator is summarized with a table of source connections shown in FIG.

In Fig. 11, the tube VTi serves to receive and amplify the occupancy pulses. The tubes CT 5 and CT 6 control the potential that is offered to all call tappers according to the free or busy status of the »^ /« control. The tube CTy is used to pick up the reception of an occupancy pulse and to block ^{the tubes CTs and} CT 6 immediately.

The triodes CTs and CT 6, which form two parts of a double triode, have correspondingly connected electrodes so that they work like a triode. They are also designed as a cathode follower tube (resistor R 79 A, FIG. 10). The parallel connection of the triodes CT 5 and CT 6 took place for reasons of power consumption.

The common grid potential of the tubes CT 5 and C7'6 is normally, as long as the "A" control is free, kept at -15 volts by the voltage divider RS ^, R86, which is between the negative pole of -48 volts and Earth lies. Both tubes CT 5 and CT 6 are therefore conductive, and their anode currents , which run to resistor R79A (FIG. 10), keep their common cathode at a potential which is 2.5 volts less negative. This potential, which is applied to the junction of a free evaluator for control devices in all call tappers via terminal p, indicates that the control device is available.

The common point m of the evaluator for occupancy pulses (Fig. 10) is connected to the grid of the tube FTi in the circuit AM (Fig. 11), which is designed as a cathode follower tube, the anode of which is connected to the terminal r, the contact Sf 2 A of the in -the rest position actuated relay SfrA (Fig. 8) and the resistor R62A with +150 volts and whose cathode is connected to the terminal s via the 12,000-ohm load resistor R 57 with -150 volts. As long as no occupancy pulse arrives, the grid is held at a potential of -40 volts, which is taken from the control sources Nc τ, Nc ^, and the resistor R 2JQ A via the terminal η and the rectifier G 32 (FIG. 11). In this switching state, an anode current of 10 mA flows in the tube VTi, and the cathode has a voltage of -36 volts.

An occupancy pulse of about 13 volts, which occurs at the common point m of the evaluator, blocks the rectifier G 32 and raises the cathode potential by about 12 volts.

The pulse sources Nc ι and Nc 3 are used to keep the grid of the tube VT 1 at a potential of -40 volts, which corresponds to the common basic voltage of these pulses.

The anode of the tube CTy is connected to the grids of the tubes CT 5 and CT 6, and that

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The grid normally has a voltage of -148 volts, whereas the cathode has a voltage of about -134 volts, which is generated by the voltage divider R 56, -R83 between the source of -150 volts and ground. This means that the tube CT 7 is normally switched off; but as soon as a positive pulse appears at the cathode of the tube VT 1, this pulse is transmitted via the coupling capacitor C 5 to the grid of the tube CTy , whereby its potential is raised so far that this tube ignites. The resulting voltage drop in resistors i? 86, R84. is impressed on the grids of the tubes CTs ^and CT 6 and therefore also appears on the cathodes of these double tubes. As a result, the reduced voltage is transmitted to the cathode of the tube CTy via the resistor R 78 and the coupling capacitor C 9. This causes the anode current to rise in this tube, so that the anode potential falls even more rapidly. As a result, the tubes CT 5 and CT 6 are completely switched off, and a cathode potential of about -41 volts remains.

In this way, the free potential at the terminal p (FIG. 10) is removed, and this switching state is maintained as long as the capacitor C 9 is charged via the series resistors R80 and RyS .

During this charging process the voltage on the grid and on the cathode of the tube CTy rises from -162 volts to -150 volts, and as soon as this voltage is reached the anode current in this tube decreases, causing the anode potential to rise. This increase causes the tubes CT 5 and CT 6 to ignite again. The circuit was quickly brought back to the rest position.

The time constant, which defines the time interval between the ignition and extinction of the multivibrator

4.0 circuit controls is relatively short, so that this circuit, if it were effective on its own, would only come to rest after a few time units. A rectifier gate G 5 is also provided, by means of which the multivibrator can be held in its working position by applying a sufficiently negative potential to the cathode of said rectifier gate. In the rest position, the cathode of the rectifier GS is held at ground potential, whereby this rectifier is blocked, but if this potential falls below ^-1 volts, which z. If, for example, the pulse has ignited the tube BAVA (Fig. 14), thereby lowering the potential at the contacts Pay A, Bm ^ A , the grids of the tube CT5-CT6 cannot rise above -48 volts, so that this does not re-ignite. It should be noted here that the BAVA tube ignites before the multivibrator is ready for occupancy again and a new occupancy pulse appears.

In this way, the occupancy state can be maintained by a sufficiently negative potential that is applied to the rectifier G 5, but this can also be done by disconnecting the supply line with + 150 volts at the terminal through the contact Sf 2 A (Fig. 10) can be achieved. For example, it can be seen that when Bm ^ A is opened and the tube BAVA turned off so that the negative potential at the cathode of the rectifier G ₁ 5 disappears, the off state (by the disconnection of the normally operated relay sfra contact Sf 2 A) is maintained before the relay 5m3 A \ responds.

The relay AmrA in the circuit of FIG. 18 is always activated to check for errors in the register scanning circuit. The CT 8 A tube is normally ignited and it is its anode current which switches on the AmrA relay, regardless of whether there is a fault, in which case the CT 8 A tube is extinguished and the AmrA relay has dropped out To put the circuit out of operation.

Relay AmrA (Fig. 18) is normally activated. The relays ZxrA and BurA (Fig. 15) have dropped out. The relay SfrA is operated in the idle state (Fig. 8). Since the relay VorA (Fig. 14) is not switched on, the occupancy pulse at the output terminal 9 of the call tap (Fig. 10) is passed to the comparator generator CRGiA (Fig. 12) via contact Sf A of the relay SfrA, contact Vo SA of the relay VorA and terminal UiA. Fig. 13 shows the details of such a comparator which is used in various circuits of the office.

For this reason, the facility CRG in FIG. 13 is used in place of the facility CRGiA in FIG. 12, and the corresponding sources have the suffix "iA".

Such a comparator generator has an input for signal pulses and an input for the reference pulses. Its purpose is to match the incoming signal pulses with the reference pulses to compare and to generate a new pulse when the signal pulses and the reference pulses coincide.

The newly generated pulse lies in the time unit which occurs after the coincidence and is on transferred to a memory where its time slot is sampled and stored.

Such comparator generators usually contain special blocking tubes, which in the event of failure of the corresponding generator as soon as the first pulse is sent out by said generator, avoiding more than one Pulse is successively transferred to the memory.

In the present case, the tube CT ι (Fig. 13) picks up the coincidence between the reference pulse and a pulse of 25 ^ sec. The reference pulse is sent from the source άτ, (Fig. 20), and this occurs at the beginning of each time unit. In the case of coincidence, this tube generates a short intermediate pulse at the beginning of the time unit that follows the time segment in which the reference pulse lies. The VT 2 tube senses the coincidence between an arriving

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the signal pulse and the output pulse of the tube CTi .

The triodes FTi and FT 2 form the pulse generator, the output of which is amplified by the tube CT 2.

The CTi tube is a swell tube whose cathode is biased to around 10 volts between earth and +150 volts using the voltage divider R66, R67.

The grid of this tube is normally at a potential of by the source of the reference pulses

- 29 volts biased. This means that the tube is switched off and the rectifier G 29 is

, is blocked (the cathode of the rectifier G 29 is connected to earth).

The reference pulses, which are applied via the terminal ν ι , raise the potential at the anode of the rectifier mentioned high enough to unlock it. The grid of the tube CT ι thus rises to earth potential, which is not sufficient to make the tube CT ι conductive. The positive pulses of 25 // see duration and of approximately 40 volts amplitude are fed in by the sources c? 3 at the beginning of each time unit and to the primary winding of the transformer CALA (1: 1) via the capacitor C 71 A (Fig. 20) created.

The pulses which appear at the output of this transformer are superimposed on a bias voltage of -24 volts, which is provided by the voltage divider R 27 1 A, R 272 A between earth and -48 volts. Since the transformed output level has already dropped by 5 volts, due to the fact that the impulses d ?, only occur in the last 25 ₍ «sec, el. H.

in an eighth of the time unit of 200 /, <sec (-40 Volt: = 8 * '- 5VoIt) ₁ its basic level is at -29 volts and +11 volts at their tips. These pulses are applied to the terminal wi A via resistor Rgo and capacitor C16 on the grid of the tube CT ι (Fig. 13).

A rectifier G 30 connected in parallel is provided to limit the amplitude of these pulses to 29 volts. Its cathode is normally connected to earth potential via terminal y ι Α, normally closed contact Bin ?, A, normally closed contact Pa7 A (Fig. 14). This means that the rectifier is blocked, except for the pulses that arrive via the A resistor R 90. These pulses unlock the rectifier and prevent the potential from rising above ground potential.

The pulses d}, which appear on the grid of the tube CTi via the capacitor C 16, raise the grid potential from -29 volts to earth potential when no reference pulses are present. It should be noted that, in the absence of the reference pulses, the grid of the tube CTi has a voltage of

- Has 29 volts, because of the gate circuit of the coincident network on the left side of FIG. 12, which controls the potential at the terminal ν ι Α.

When the reference pulse arrives, it charges the capacitor C16, so that the grid of the tube CT has approximately ground potential, and the pulses 6-3, which arrive via the capacitor C16 at the beginning of the next time unit, bring the grid voltage to a sufficiently high potential raise so that the tube CT ι becomes conductive.

The tube CT 1 can also become conductive when a pulse i / 3 arrives in the absence of the reference pulses, if the capacitor C 16 was previously charged by ground potential which was applied through the normally closed contact PagA of the relay ParA (FIG. 14).

When pulse d-3 is effective, a short ignition pulse of 24 volts amplitude is generated at the cathode of tube CT 1 and this pulse is applied to the grid of tube VT 2 via capacitor Cj8. The cathode of the tube VT2 is biased to about -5 volts by means of the potentiometer R6gA, R74A (Fig. 12).

As long as the comparator generator is not in operation, the grid of the tube VT2 is biased to -48 volts via the terminal ui A and the resistor R64A (FIG. 10).

However, as soon as the circuit for supplying the signal pulses is connected to the input, the lower pulse level rises to about -36 volts and the grid potential to -25 volts for each signal pulse (due to the charging of capacitor C 18). This can not unlock the tube VT 2 without a short ignition pulse being received from the cathode of the tube CT ι , and / Λλ'Άτ via the charged capacitor C 18 in the time unit following that in which the signal pulse is. In this case the grid of the tube VT 2 is unlocked for a short time. The resulting voltage drop in the anode is transmitted to the grid of the tube FT 2 via the capacitor C21.

The ignition pulse from the cathode of the tube CTi alone cannot unlock the tube VT2.

The tubes FTi and FT2 together form a cathode-coupled monostable multivibrator, and the tube FT 2 is normally conductive, whereas the tube FT 1 is normally switched off.

The anode load of the tube FT 2 consists of the resistors R 99 and RgS, which are connected in series. As soon as a negative pulse of sufficient amplitude reaches the grid of the tube / ⁷ T2, the anode current of the tube FT 2 falls, as does the cathode bias of the tube FTi. This makes the tube / ^{7 Ti conductive.} The voltage drop at the anode of the tube / ⁷ Ti is transmitted by the capacitor C 21 to the grid of the tube FT 2 and causes the latter to become non-conductive. The tube / ⁷ T2 will soon be completely switched off, whereas the tube FT 1 is conductive.

This switching state remains while the capacitor C 21 is charged via the resistor Rp /, which causes the grid potential of the tube FT 2 to increase exponentially until it reaches a value for which the tube / ⁷ T2 becomes conductive again, whereby by a

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In the reverse process, the initial state is restored with the tube FT 2 ignited and the tube FT 1 switched off.

The exact moment at which the tube FT 2 is unlocked again is ensured by a stop pulse from the source d.2 , which is sent to the grid of the tube FT 1 via the capacitor C 22.

The occurrence of such a pulse reduces the anode current of the tube FT 1 and thus initiates the reversal.

Since a pulse d 3 arrives via the terminal wiA at the beginning of a time unit and a pulse d2 25 / isec before the end of the same time unit, the repeated positive pulse at the anode of the tube FT 2 has a duration of exactly 175 µsec and is at the beginning that time unit which follows that in which the signal pulse and the reference pulse occur simultaneously.

This pulse of about 90 volts amplitude is transmitted via the capacitor C 25 to the grid of the tube CT 2, which is biased to -122 volts with the help of the voltage divider R 100 and Rioi.

The tube CT 2 is designed as a cathode follower tube, and the pulse on the grid is generated at the cathode output between the potential levels of -107 volts and -27 volts. The output pulse is transmitted to the memory and tube BAVA shown in FIG.

Returning to the occupancy pulse of Fig. 11, this is applied to the grid of the tube VT 2, (Fig. 13) via the terminal u 1 A , and since the relay ParA is not actuated and the contact Pag A is closed, the tube CT 1 generate a short ignition pulse without any sources of supply, Awhich its grid is initially at ground potential. As a result, a new pulse is generated again in the unit of time which follows that in which the occupancy pulse lies.

From the cathode of the tube CT 2, the newly generated pulse is applied via the terminal χ ι A to the memory (FIG. 14) via the normally closed contact Pa4A.

According to the call picker who has seized the "^" control, the seizure pulse meets three special pulses: one pulse from group Rb 1-4, one pulse from group Rc 1-4 and one pulse from group Re ι -3. Since these impulses reach the corresponding tubes of group VbA 1-4, group VcA 1-4 and group VeA 1-3, one tube is ignited in each group. The combination of the ignited tubes is the characteristic of the occupancy pulse and thus of the

Call picker that has occupied the »^« control.

The three groups of tubes mentioned make up a total of eleven tubes, which are 4X4X3 = Enable 48 combinations, namely

^c ° speaking to the 48 call taps for 4800 subscriber lines.

The anode relays BarA-BärA belong to the group of four tubes VbAi-4.

The anode relays CarA-CdrA belong to the group of four tubes VcA 1-4.

To the group of three tubes VeA. 1 -3 belong to the anode relays EarA-EcrA.

The relays RdarA to RddrA are actuated by the normally open contacts Ba 1 A to Bd 1 A. The relays RearA to RcdrA are actuated by the working contacts Ca 1 A to Cd 1 A.

The relays RearA to RecrA are actuated by the normally open contacts Ea2A to Ec2 A. Thus, a relay responds in each of the groups RdarA to RddrA, RearA to RcdrA, RearA to RecrA in order to identify the call picker that has occupied the "^" control.

At the same time the occupancy pulse ignites the tube BA VA, and the relay XrA speaks in a circuit from earth via the resistors' R 1 14 A, R 28s A, winding of the relay XrA, resistor Rii ^ A, break contact Bm 2> A, Break contact Pa 7 A, anode-cathode of the tube BA VA to-150 volts on. The potential at the connection point between relay XrA and resistor R 113 A, which is normally connected to earth potential, drops to -45 volts. In the comparator generator (FIG. 13) the rectifier G 30 is therefore conductive and swallows all the J3 time pulses which still cannot reach the grid of the tube, so that the generator is ineffective as long as the tube BAVA remains ignited.

When relay XrA is actuated, relay VorA (Fig. 14) speaks of battery via its own winding and the normally open contact X ι Α zn.

The connection between the switching device AMA (FIG. 10) and the comparator generator CRGiA (FIG. 12) is thus cut off with contact Vo 5A.

The relay BurA responds via normally open contact Vo ι A (Fig. 15), and relay SfrA (Fig. 8) drops when the response current circuit with contact Bu 2, A is opened .

The busy status of the »^« control is maintained by the switching device AMA . The supply voltage of + 150 volts is suppressed by the normally open contact Sf 2 A (Fig. 10) at the terminal r , while the connection between the device AMA and the comparator generator with normally open contact Sf ι A (Fig. 10) is still open.

The relay HrA (Fig. 8) responds via normally closed contact Ho 4 A, normally closed contact Sf 7 A and normally open contact Vo 2 A. -

The relay ZxrA (Fig. 15) cannot pick up yet because of the earth potential via the normally open contact H 3 A, as it is short-circuited by this ground potential via the normally open contacts of the anode relays of the ignited tubes and its own normally closed contacts.

Because of the response of one of the relays RdarA to RddrA, RearA to RcdrA and RearA to ReceA , one of the 48 connecting relays RA 1 to RA 48 (Fig. 8) speaks via one of the terminals of the contact pyramid (Fig. 15) from earth to break contact Lf 4 A, normally open contact H4 A and the contact

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combination of the anode relays of the ignited storage tubes.

That relay, which of the relay RA ι

until RA 48 has responded, therefore belongs to the call picker that has seized the "^" control, and therefore to the ESBO-ζ, Άϊζ to which the corresponding first caller group belongs.

The "^" control is partially connected to the aforementioned ESBO set for first call seekers (Fig. 8) via contacts 5, 7, 9, 11, whereas with contacts 1, 2, 3, 4, 6, 8, 10 the connection of the "A" control with the corresponding lines of the ESBO set is only prepared.

A test process is initiated to have the certainty that this ESBO record is free. In the circuit of this ESBO set (Fig. 7) the free state is given by a potential of +24 volts, which is applied via the following circuit: Contact Cf2.1 via the normally closed contacts T / 31, Otzl, MCl, AfZl, ESBO set, terminal 10 (Fig. 8), normally closed contact Cp 9 A (Fig. 8), normally closed contact Co 3 A (Fig. Ij), normally closed contact Ho 9 A to the test circuit STA (Fig. 18) in the "^" -Steering.

The test circuit is used to check the free or occupied state of an arrangement which is desired by the »^« control, ie to determine whether the desired ESBOSaXz is not already occupied by another »A « control.

After the ESBO record has been found free, the test circuit prevents other "^" controls, the above-mentioned ESBO record, from being assigned later, which will be explained later.

In order to avoid that two or more "^" controls the switching status of the same £ 5 "B0 record check at exactly the same point in time, there is a time division between all control devices in provided by the office. This means that every control device has a characteristic time slot, in which it can only be tested.

The main functions of the test device and its details in FIG. 19 are shown in the basic diagram STA of FIG.

Since, as can be seen later, the same test circuits are used for the "13" and "C" controls (principle diagram STB [Fig. 45], principle diagram STC I Fig. 58]), there is only one circuit in FIG shown, which is labeled .ST.

It is therefore clear that the terminals labeled xx, yy in Fig. 19 are designated as terminals xxA, yyA in Fig. 18 (for a "^" control), as terminals xxB, yyB in Fig. 45 ( for a »ß« control) and as terminals xxC, yyC in Fig. 58 (for a »C« control).

The test potential, which is connected to the first call seeker in the ESBO record via the contact Ho 9 A , is applied to the anode of the rectifier G 51 A and also to the A resistor RiGgA (FIG. 18). The latter forms part of the gate circuit which contains gates G 52 A and G 53 A. These gates are controlled by a pulse Rax from sources Ra and by a pulse Rbx from sources ¹ Rb.

As long as no pulse arrives, the gates G 52 A and G 53 A are conductive, since their anodes are connected to earth potential, with the help of the gate networks, which consist of the resistors R 206 A, RiJZA, RijoA and the rectifiers G 110 A, GmA , G 92 A, GgzA exist.

In this network, a current of 3 mA of + 150 volts flows through the resistor R 206 A. This current is divided into 2 mA through the rectifier Gi 10 A to the negative battery -48 volts through the resistor R2 10 A and 0.5 mA in each of the two branches that are parallel to - 150VoIt ₁ which contain the rectifier GgzA and the resistor RiJZ A in series for the first branch and the resistor G 92 A and the resistor RijoA in series for the second branch.

Since all rectifiers are conductive, the potential at the cathodes of the gates G 52 A and G 53 A is determined by the earth potential, which. at the rectifier Gin A. Therefore, in this switching state, the grid of the tube OT1 (Fig. 19) should not be placed above ground potential.

A pulse Rax, which is connected to the resistor RiJi A , is transmitted via the capacitor C44A and blocks the rectifiers G 52 A and G92A.

In the same way, the pulse Rbx, which is connected to the resistor R1J2A , is transmitted via the rectifiers G 53 ^ and G 93 ^! transfer.

Only when the two pulses Rax and Rbx coincide will the gates G 52 A and G 53 ^ i be blocked at the same time, and a potential of + 24VoIt, which is applied across the resistor R 16g A , will raise the potential at the grid of the tube OT 1 (Fig. 19) to + 16 volts via the resistor R 211 (via the terminal yyA, Fig. 18), the capacitor C 41 being charged. The coincidence of the pulses Rax, Rbx indicates the time slot which is allocated to the "^!" Control for the test process.

The cathode of the tube OT1 is biased to about + 22 volts, through a network consisting of the resistors R 166, R21Z and i? 2i2, which are connected to + 24VoIt ₁ ground potential and + 150 volts.

Therefore, the coincidence of the +24 volt potential in the ESBO set, the pulse Rax and the pulse Rbx is insufficient to ignite the tube OT 1.

The distribution of the pulse sources Rax, Rbx for each "^" control is shown in an exemplary embodiment in the table in FIG. 71.

The time pulses from the source dz are fed periodically at the beginning of each time unit via the capacitor C 38. They are limited by a network consisting of the resistor R 216 and the limiting rectifiers G 57 and G 58.

The anode of the rectifier G 57 is connected to earth X25 potential connected, whereas the cathode of the

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Rectifier G 58 is biased to +12 volts, through the voltage divider R 175, R217 between +24 volts and ground potential.

The time pulses are limited in amplitude to about 12 volts, and these limited pulses are applied to the grid of tube OTi through capacitor C 41.

If the mentioned capacitor is already charged in the previous time unit and a coincidence occurs between a potential of 24 volts in the ESBO-Sztz, the pulse Rax and the pulse Rbχ, the time pulse d 3 raises the grid potential of the tube OT 1 to about +28 Volts and makes this tube conductive.

As soon as this occurs, there is a voltage drop at the anodes of the tubes OTi and OT 2, and the voltage at terminals 1 and 2 of the primary winding of the transformer TR induces a voltage in the secondary winding 3-4 in the direction that the grid potential of the tube OT 2 increases.

The grid is normally biased to about -3OVoIt using the voltage divider Ri6jA, R208A between -48 volts and earth. Since the cathode of this tube is at earth potential, this tube is normally switched off.

When the voltage induced in the second winding of the transformer TR has a sufficiently large amplitude, the tube OT 2 is unlocked, which causes a further voltage drop at the anode and a greater potential increase at the grid of the tube OT 2 . This gives an impulse.

In this way a positive pulse of nearly 60 volts is generated on the grid of tube OT 2 and this pulse is transmitted to the ignition electrode of cold cathode tube SVA (Fig. 18) via capacitor C 34, terminal xxA and resistor R162A.

The cathode of this tube is connected to -150 volts through resistor R163 A and the winding of relay TrA , and the ignition electrode is normally biased to -110 volts by the voltage divider i? 273 ^, R 209 A and R 165 A between earth potential and -150 volts.

In the absence of the pulse from tube OT 2 (Fig. 19), the ignition electrode of tube SVA therefore has a bias voltage of + 40 volts with respect to the cathode, and a pulse from the blocking oscillator can thereby ignite tube SVA. When the tube SVA (Fig. 18) has ignited, a current of 15 mA flows through the cathode relay TrA. Of this, 2.4 mA are drawn from the +24 volt source, via the resistor R 159 A, normally closed contacts Fp 10 A, Ep SA, DpioA, CpioA, normally open contact Bu2A, 7.8 mA are drawn from the earth potential, namely via the rectifier G So A and the same relay contacts, the remaining 4.8 mA is taken from the test resistor in the ESBO-Sztz via the rectifier G 51 A.

As a result, the test potential in the resistor of the £ 5 "50 set (Fig. 7) is reduced to ground potential because of the voltage drop of the 24 volts at the resistor R159 A. This prevents the test circuits in other" ^ "- Control devices try to occupy the same ESBO record at the same time.

The relay TrA is actuated in the cathode circuit of the tube SVA. A ground potential is thus available in order to switch the relay BmrA (Fig. 10) via contact TiA and the normally closed contacts Fo 4 A, £ 03 ^ 4, Do 4 A, Co 4A .

The response of relay BmrA clears all tubes that are ignited in the memory by opening the contact Bm4A. The corresponding anode relays drop out. When contact Bm 3 A opens, relay XrA drops out and tube BAVA goes out (Fig. 14).

By opening the contacts of the three anode relays, namely one relay in group Bai A. . ., a second relay in group CaiA ..., a third relay in group Ea2A. . ., the relay ZxrA (Fig. 15) short-circuited directly to earth drops out, and relay ZxrA speaks via normally open contact IT3A Άτι and thus holds a circuit for the three relays of the groups RdarA. . ., RearA. . ., RearA. . . via their own working contacts and relay ZxrA in series to earth.

. The dropping out of the relay XrA does not release the relay VorA , because a holding circuit for this relay is closed via its own normally open contact Vo 3 A, normally closed contact Ha 8 A and normally open contact Bfi-i ι Α .

Relay BurA therefore remains attracted.

The relay CPRA (Fig. 10) speaks of battery over contact Zx 2 A, break contact Ho 10 A, open contact H2A to ground and switches (Fig. 8) with its own working contacts CP2a, CP3a ... Cgpa the compound of »^ «Control with the corresponding ESBO set (first call seeker), which was prepared by the connection relay RAn in the group RA 1 to RA 48.

Opening the contact Cp 10 A clears the tube SVA (Fig. 18) and the relay TrA no drops out. The anode of this tube is thus brought to a negative potential. The drop in the relay TrA causes the switch-off of the relay BmrA (Fig. 10) by opening the contact T ι Α. The opening of the contact Bm ι Α causes the fall of the relay VorA (Fig. 14), but Relay BurA remains attracted in series with relay ZxrA (Fig. 15).

The relay CorA (Fig. 10) speaks of the battery via contact Cp ι A, normally closed contacts Dp 4 A, Ep 2 A, Fp 4A and T 3 A to earth.

Simultaneously with the test process for the free switching status of the £ 5 "50 set (first Call finder) and the connection with this E ^ SO sentence becomes the register scan and the Link set scan performed.

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The 48 caller groups for 4800 lines

are divided into two subgroups A and B , which in many cases serve 4800 subscriber lines.

The »^« control begins to look for a free register. The cord connector sets are divided into groups, and each group serves 1200 lines. Each of the string groups is divided into two subgroups A and B. For an exchange with 10,000 connections, eight groups can be used which serve 1200 lines and one group which serves 400 lines.

In the example chosen for an exchange with 4800 connections, four groups with 1200 connections each are divided into subgroups A and B.

The line selectors and register groups are also divided into subgroups A and B. These are in turn divided into further subgroups A 1, A2, Bi, B2 .

Only one free register of subgroup A or B can be occupied by the "^" control if there is a free ZLS \ BO record for the cord selection device, free cord sets and free first callers of the same subgroup A or B and if the free cord connection sets are available the same subgroup belong to the string group of 1200 lines serving the calling subscriber line.

If a register is free, a potential of +24 volts is applied to the corresponding line Ei ⁷ 1 A (FIG. 18), via the normally open contact of the activated relay RfrR in. the register circuit (Fig. 32). If a register is occupied, a ground potential is connected to the corresponding line EF 1 A.

In a "^" control, all register lines EF 1 A are scanned via the evaluator, which is shown in simplified form in FIG.

A more detailed exemplary embodiment of such an evaluator is shown in FIG. 67. The Evaluator scan 24 registers through each of the eight "^" controls.

Each register subgroup A 1, A2, Bi, B2 contains six registers.

The sampler contains 40 taps in eight groups of five multiples which are controlled by sources Pb 1 -5.

Five registers of subgroup A1, five registers of subgroup A 2, five registers of subgroup B 1 and five registers of subgroup B 2 are connected to four of the named groups of five multiples.
. In the four other groups of the five multiples with the terminals a ' to e , the sixth registers of the groups y4 1, A2, Bi, B2 are connected to the terminal which is indicated by the table according to the search process for the "^" - Control, is marked.

The eight common lines for the eight groups of the five multiples are controlled by the pulse sources Pal -5, Pc 1-4, in accordance with the identification of the connection of the sources with the terminals α to d, as shown in the table with the searches for the "^" control is shown.

The terminals labeled αϊ, σ · 2, b 1, b2 are connected to the ESBO sets for the cord selectors A 1, A2, Bi, B2 so that a register circuit is assigned to only one ESBO set one for line search devices of the same subgroup and with a cord connection set that serves the corresponding group of 1200 lines. The register sampling pulses are received via the corresponding rectifier GA 1/8 if the mentioned ESBO set and the cord connection set are occupied. This will be explained in connection with FIG.

It must be noted that the rectifiers GA 1/8 are represented in a simplified manner by the rectifier GA in Fig. 18 ("^" control), whereas the 40 register branch terminals ι to 5 ... α to e in Fig. 18 are represented by the terminal EF ι Α .

In Figure 26 of the ESBO kit for cord link locators, tube VT 1III is normally conductive; its grid, which is connected to the tube VT 2III, is normally switched off. The cathode potential of the tube VT 2 III is about +16 volts, whereas the grid is at ground potential (rectifier GIII conductive).

The anode of the tube VT1 III is connected to ground potential as a result of the permeable rectifier G 2III, so that the register sampling pulses are received in the "^ /" control via the rectifier GA (Fig. 18), which is conductive.

An evaluator for scanning free cord connection sets is provided on the grid of the VT 2III tube. The evaluation branches are controlled by the sources Pd , which are applied to the cathode of the rectifier G10III connected in parallel. Each source Pd. corresponds to a cord connection set group for 1200 lines. When a cord connection set is free, a potential λ ^Γ οη + 24 volts is applied to line IV in the cord connection set (Fig. 31).

The rectifiers G 10III pick up the potential of +24 volts on the corresponding line of the evaluator, except when the corresponding source Pd sends a pulse which brings the cathode of the rectifier mentioned to + 24VoIt. In this case the grid of the tube VT 2 III is also brought to a voltage of +24 volts, and this is therefore conductive (it is assumed that the ESBO set for the cord set finder is not used). The resulting voltage drop at the anode is transmitted via the capacitor C 18III to the grid of the tube VT 1III, which performs the shutdown. As a result, the potential at the connection point of the resistors R 17 III, R 3III rises above +24 volts.

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By limiting the rectifier G 3 III, this point is brought to +24 volts, so that the rectifier GA, (Fig. 18) ("A" control) is blocked and the register strobe pulses are no longer recorded and over the common point of the The evaluator can be transferred to the »^« control. This takes place in time slots which, in addition to the register, also identify the group of the free cord connection set which are available in subgroup A or B, which is assigned to the register.

For an office of 10,000 participants, nine groups of cord connection sets are provided

(e.g. eight groups, each of which serves 1200 subscribers, and one group, which serves 400 subscribers). In this case, there are also nine sources Pd . The sources Pd 1-9 are used to control the evaluator, as shown in FIG.

However, in the example chosen for an exchange of 4800 subscribers, there are only four groups of cord connection sets, each of which serves 1200 subscribers, so that only the sources Pd 1-4 are used. The register sampling pulses can continue to be recorded from the common point of the evaluator if no first call seeker in the same subgroup A or B is free.

The subgroups A or B in the ESBOS & tz for first call seekers, in which free call seekers are identified that are connected to the "^" control, are defined by the pulse source pairs Pc i, Pc 2 (sub-group A) or the pulse source pair Fc 3, Pc4 (Subgroup B) via the normally open contacts K 21, L2I in FIG. 6.

Either one or two or none of these relays is actuated, depending on whether there are free first call seekers in either subgroup A or B or in both subgroups or in neither subgroup. In FIG. 18, the register sampling pulses in the absence of the pulses Pc in the ESBO-SaXz for first call seekers (FIG. 6) are transmitted via the rectifier G 59 A (FIG. 18, then FIG. 17, FIG. 9, FIG. 8) Contact 11 ("^" - control) and then in the ESBO set the corresponding line in Fig. 7 and 6 and the contacts L2 1, K2I connected in parallel. But whichever pulses Pci, Pc 2 or Pc 3, Pc 4 or both are applied via the corresponding contacts, the register scanning pulses are no longer recorded and transmitted from the common point of the evaluator (Fig. 18) to the grid of the tube CT&A , which as Cathode follower tube is designed and serves to amplify the evaluation pulses and then to lead them to the tapping device in the "^" control. The anode of the CT 8 A tube is connected to +150 volts. The grid is connected to earth potential through the rectifier G 60 A, which is normally conductive; a current of about 50 μΑ flows, which flows from j earth via rectifier G 60 A, resistor R'2igA to -150 volts.

If the evaluator generates a ¹ pulse of about 13 volts, the rectifier G 60 A is blocked and a pulse is produced at the cathode output of the CT 8 A tube.

A gate G Sg A is provided in order to receive certain impulses from those which are offered by the evaluator if necessary. As long as the potential connected to the cathode of the rectifier G Sg A is equal to +16 volts or higher, the gate G 5g Λ is blocked and the pulses can reach the grid of the tube CT 8 A unhindered. But as soon as the cathode potential of the rectifier G 5g A is lowered to ground potential or lower, no pulse can raise the grid of the tube CT 8 A above ground potential. This is particularly true in the absence of coincidence of the two pulse sources Pc , which characterize group A or B in the _ESBO-1 sentence (first call searcher).

When a pulse which corresponds to a free register is received at the cathode of the tube CT 8 A , it is transmitted to the comparator generator CRG 2 A (FIG. 20) via the normally closed contact Oa9> A, _ normally closed contact Wo 3 A, namely in the same way as the assignment for call tapping to the comparator generator CRGiA (FIG. 12) via the normally open contact Sf ι A and normally closed contact Vo S A was transmitted.

In the same way, the pulse is renewed in the unit of time following that in which is the coincidence of the register strobe and the reference pulse from the network on the right in FIG.

Since the relay OarA is not activated, only the sources of supply Rd 1 -4 via normally closed contact Oa 7 A are used. Since only one of the relays RdarA to RddrA has been actuated as a result of the ignition of one of the tubes VbAi- 4, only the corresponding contact from the contacts Rda 1 A to Rdd 1 A is closed and only the corresponding source Rd is used.

It should be noted that the same sources Rd 1-4 are used to control the cold cathode tubes VbA 1-4 in the memory (Fig. 14), each of these tubes identifying 1200 subscriber lines (4800/4). Since one of the tubes VbA 1 - 4 has therefore ignited due to the closing of the corresponding relay contact in the group Rda ι A to Rdd 1 A , the source Rd, which was created by this contact, identifies the group of 1200 subscribers in which the calling Participant lies.

Therefore, the renewed pulse marks a free register, which gives access to a free one Cord connection set in a cord connection group which serves a group of 1200 participants, including the calling party.

The renewed pulse is transferred to a second memory (Fig. 21) in which the Identification of the register is saved.

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This pulse ignites the tube BBVA, and relay YrA responds via normally open contact Bu 4 A, normally closed contact Cm 3 A in the anode circuit of the said tube.

With its normally open contact Yi A , relay YrA closes a circuit for relay WorA, which also responds.

The renewed pulse is also transmitted to the grid of the double triode CTgA, CT10 A , which is designed as a cathode follower tube. This double tube becomes conductive and the pulse is sent on from the cathode to the £ .S \ BO set for cord link finder (Fig. 26) to mark the circuit as busy and to prevent two free registers from being connected which access to the same cord connection set group if only one cord connection set is available. For this reason every £ 5 "J5O set for cord connection finder (Fig. 26) is provided with an evaluator which enables the scanning of all" ^ "controls (e.g. 8). The cathode of the CTgA tube in each" ^ "control is connected to the corresponding junction of the evaluator, as shown in simplified form in FIG. 26, left.

Fig. 68 shows a detailed embodiment of such an evaluator, which allows the scanning of eight "^" controls by each of the four .ES \ BO devices for string connection searchers A 1, A 2, Bi, B 2.

The output O of the evaluator in the corresponding E5 \ ß0 device for cord connection finder is connected to the grid of the tube CT 1III.

This tube is designed as a cathode follower tube. In the absence of momentum, their grid is in place at ground potential, which is negative with respect to the cathode, which has a potential of about +3 volts (current 7.65 mA).

The tubes FT 1 III -FT 2 III form a cathode-coupled monostable multivibrator. The tube FT 1III is normally switched off, whereas the tube FT 2III is normally ignited and the relay MrIII in the anode circuit has responded.

The anode of the tube FT1 III is at ground potential, and the rectifier G 4III is blocked because its anode is at about -54 volts, via the potentiometer R 28 III, R 29III between ground and -150 volts. The common cathode of the tubes FT 1 III, FT 2 III is about -125 volts. A current of about 10 mA flows through the FT 2III tube.

The anode of the tube FT 2 III has a potential of about -50 volts. Normally, the rectifier G 27III is conductive, between -48 volts and - 150 volts across resistor Rg III. The rectifiers G 9III and G 26III are blocked.

The grid of the tube VT 3III is around -48 volts, while its cathode has a voltage of around -42 volts, and because of the potentiometer R 15 III, R 16III between earth and -48 volts.

The tube FTIII is therefore not conductive, and a voltage of -24 volts is applied to its anode (the contact cfilll is activated). The rectifier G 28III is blocked, as is the rectifier G 24III.

When the scanning pulse arrives at the grid of the tube CT III, a pulse of about 14 volts amplitude appears at the cathode of this tube and is transmitted directly via the capacitor C 6III to the connection point of the rectifiers G 26III, G 27III. The rectifier G 27III is blocked, rectifier G 26III becomes conductive, and rectifier G 9III is blocked.

The grid potential of the tube VT 3III is on

- 42 volts raised (cathode potential), and the tube becomes conductive. About 6 mA flow in the Tube, the anode potential through the rectifier G 28III, which is conductive ο Volt is held and 1.2 mA flow through the resistor i? 4III, while 4.8 mA flow through the rectifier G 28III flow.

At the same time, the pulse at the cathode of the tube CT 1III runs through the capacitor C 5III and the low-pass filter R 24III, C 4III (to avoid high-frequency interference by igniting the multivibrator FT 1 III -FT 2III) to the grid of the tube FT 1III. This makes the tube conductive, the voltage drop at the anode, which is transferred to the grid of the tube FT 2 III, extinguishes the tube, whereby the anode potential is raised to ο volts.

However, this only occurs after the impulse at VT 3III has been triggered by the direct impulse, namely because of the loss of time in the low-pass filter.

The tube FT 2 III is switched off and relay MrIII drops out. This also releases relay Cfr III, which sends the test potential of +24 volts to the "^" control via contact Cf4 III (Fig. 29) and applies -48 volts to resistor R 53III via break contact cf 1III.

The rectifier G 8III is unlocked and therefore keeps the grid of the tube VT 3III at about

- 34 volts, because of the potentiometer R7III, R81II. The rectifier G9III is now unlocked, while the rectifiers G 26III, G 27III are locked again at the end of the pulse! Which is applied to their connection point.

A path with low impedance via rectifier G 24III is now provided for record those impulses which correspond to a free cord connection set.

When the contact Cf 1III closes, a current of 1.2 mA flows in R4III, 2.4 mA in i? 53III, 6 mA in the tube and therefore about 7.2 mA via the rectifier G 28III, provided that the rectifier G24III is blocked; when G 24III is conductive, it reduces the current to a value which is equal to the current in the rectifier G 28III.

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Therefore 'the rectifier G 24III can be up to Absorb 7.2 mA, which is a sufficiently large limit value.

Thus, the ES-BO device is blocked for cord connection seekers in that it receives all pulses from the free cord connection sets. This state can last up to 1 second, because of the time constant of the delay circuit C ι III -R 21III of the multivibrator FT 1 III, FT 2III.

However, as soon as the "^ (" control is interconnected with the ES BO device of the cord connection finder, the Afr III relay responds, which brings the anodes of the rectifiers G 4III, G 25III to ground potential via normally open contact, 4/4111 . the multivibrator is placed in less than 1 microsecond in the rest position. For the resistor R 51III the low-resistance circuit is connected in parallel with the rectifier G 4III in series with the resistor R 58III, whereby relay MrIII responds again.

The rectifier G 8III is blocked again, but the rectifier G 25 III is connected in parallel so that the tube VT 3III remains conductive and the ESBO device for cord connection seekers is blocked until the aforementioned £ 5730 set for cord connection seekers from the »^ «Control is disconnected (drop in relays ArHlIFr III and Afr IH). When the ground potential at the contact Af4.ΙΪΙ is removed, the circuit of Fig. 26 is brought into the rest position.

Coming back to the "/ ί" control, the renewed pulse from the circuit CRG 2 A ignites one of the three tubes VfA 1-5 via break contact Oa 3 A , which is controlled by the five sources Ra 1-5 according to the occupied "^" control one of the tubes VhA 1-4 controlled by the sources Rc 1-4 and directly ignites one of the tubes VgAi-S controlled by the sources Rb 1-5. The anode circuits are closed by break contact Cm 4 A and make contact Bu 7 A.

The corresponding anode relays pick up and thus cause a relay from the RfarA-RferA group, a relay from the RgarA-RgerA group and a relay from the Khar A-RhdrA group to pick up via the contact pyramid (above in Fig. 22), whereby the earth potentials through the normally closed contacts Od 4 A, OddA and Od 3 A are operated. From the contact pyramid (bottom left in Fig. 22) ground potential is given via break contact Ob 10 A to one of the register connection relays RgA (Fig. 16), namely via one of the contacts of the group Rf a SA / Rfe ^ A, a contact of the Group RgasA / RgesA or RgaS AlRge8 A or Rgb 7 Al RgC] A and the corresponding source.

The relays mentioned are held to earth via their own working contact 12 and working contact Bu gA.

Each of said connection relays Rga is provided for two registers, one in group A,. one in group B.

A connection is thus prepared through the switched on relay RgA for a required free register without subgroup definition (A or B) .

If, however, one of the relays KharAlRhdrA has picked up, one of the relays FmrA, SmrA responds via one of the contacts Rha 4 A to Rhd 4. A and normally closed contact ObSA to earth (FIG. 16). The actuated relay FmrA or SmrA is held via its own working contact Fm6A or Sm6A and closes the connection of the "^" control to the required free register in the corresponding subgroup via the working contacts Fm ι A to Fm 5 A (subgroup A), or Sm ι A to Sm SA (subgroup B). The exact elimination of the required subgroup by relays FrmA or SmrA becomes clear when one remembers that the relays KharA, Rhbra are activated when the tubes VhAi, VhA 2 have ignited. These two tubes are controlled by the pulse sources Rc 1, Rc 2 , which characterize the subgroup A. The relays RhcrA, RhdrA are activated when the tubes VIiAt ₁ , VhA 4 are ignited; these two tubes are controlled by the pulse sources Rc 3, Rc 4 which characterize the B subgroup.

The response of the relay FmrA or SmrA also actuates the ESBO device for the cord connection finder relay CnA (Fig. 17), which corresponds to the same subgroup A or B and the same group of 1200 subscriber lines, namely in a circuit from earth via normally open contact Fm 5 A. or Sm 5 A, normally open contact 9 or 10 of the corresponding activated register connection relay Rga, the corresponding wiring WA (Fig. 16) to one of the terminals Ai, Bi ... A ¹ S, B "$ of the relays CnA (Fig. 17).

Furthermore, the connection relay for the second call seeker CgrA (FIG. 16), which corresponds to the same subgroup A or B and the same group of 1200 subscriber connections, is also actuated via the contact pyramid in the lower right corner of FIG. In this case, ground potential is established via normally closed contact Zd 5 A, one of the contacts Rda $ A to Rdd $ A (for the group of 1200 subscriber lines), accordingly via one of the contacts FmSA to Fm 11A or SmSA to up Sm ii A (for subgroup A or B) and one of the terminals Ai, Bi ... A3, B3 is applied. Relay CgrA (Fig. 16) picks up via the normally open contact Fm4 A or Sm 4 A, terminal 7 or 8 in series with the relay CorR in the register circuit "5, which is connected to the" ^! "Control (Fig. 31) The response of the anode relays assigned to the storage tubes (Fig. 21), ie one of the relays in the FarAIFerA group, one of the relays in the Gar A / Ger A group closes a circuit for the response of the relay OarA from Earth via make contact W01 A, one make contact in Qirur] \> e.Fa2AIFe2A, one make contact in the Ga2A / Ge2A group, break contact Ob 3 A, winding of relay OarA to ■ battery.

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The relay Oar A is held via its own normally open contact Oa 6 A, normally closed contact Ob JA and in each group of contacts Rfa2A / Rfe2Ä, Rga2A / Rge2A, RhasA / RhdsA .
The way from. Register scanner (Fig. 18) to the comparator generator CRG 2 A (Fig. 20) is opened with contact Oa 8 ^ 4. The circuit CRG 2 A is connected via the same working contact with the line to the ESBO device for cord connection searcher via Fig. 17 ..

The sources Rd 1 -4 for reference pulses are separated in the coincidence network (Fig. 20) with normally open contact OaJ A and are replaced by the sources Rc 2 and Rc4 for the reference pulse, namely by the same normally open contact in addition to the reference pulse sources Rc 1 and Rc 3 via the normally closed contact OC SA and normally open contact OA ζ A.

In FIG. 21, the normally open contact Oa 3 A connects the output of the circuit CRG 2 A (FIG. 20) via a second control line to the storage tube «VfA ι -5 and VhA 1 -4.

The relay CmrA speaks from the battery via normally closed contact Whether S A and normally open contact FmJ A or SmJ A to earth (according to the actuated sub-group relay).

The anode circuits of the storage tubes and the tube BBVa (Fig. 21) are opened with the contacts Cm 3 A, Cm 4 A , and all tubes that were ignited extinguish, with the corresponding anode relays de-energizing.

The relay YrA drops out, but the relay WorA remains activated via its own working contact Wo 2 A and working contact Cm 2 A.

The release of the anode relay in the memory suppresses the earth potential which was given to the relay OarA (Fig. 21) via contact Wo ι Α , and causes the release of the corresponding auxiliary relays in the groups RfarA. . . RgarA. . . RharA. This is the second response circuit for relay OarA. . . (provided to guarantee that the auxiliary relays mentioned have actually dropped out) is also open.

However, relay OarA remains activated in series with relay OhrA via normally open contact Bu 6 A. Relay ObrA can pick up , as there is no short-circuit through the initially direct earth to relay OarA .

The response of relay ObrA releases relay CmrA . The latter circuit is open with normally open contact ObS A.

The normally closed contacts Cm 3 A and Cm 4 A again close the anode circuits for the storage tubes (Fig. 21), and the contact Cm 2 A releases relay WorA.

The scan now takes place for a free cord connection set in the desired subgroup ^ or B and in the desired group of 1200 subscriber lines.

The ESBO device for the cord connection finder of FIGS . 26, 27, 28, 29 has a capacity of 10,000 connections, which are divided into eight groups of 1200 connections each and one group of 400 connections, as in connection with the ESBO circuit described. There are three double triodes at the output of the scanner: one for groups 1 to 4 (4800 connections), one for groups 5 to 8 (4800 connections) and one for group 9 (400 connections).

Only one group of 4800 connections can be connected to the »^« control in one time unit. The other groups are through other »^« controls operated.

It is assumed that the exchange contains 11111-4800 subscriber lines and that only cord groups 1 through 4 are used. Therefore, the sampling pulse comes from the cord circle via the corresponding triode (Fig. 27) to lines 11 and 9 (Fig. Ij in the "A" control) and is through one of the contacts RcIaJ A to RddjA (for iso the elimination of the group of 1200 connections), normally open contact Cgi A, normally closed contact Oc4.A, normally open contact OaSA (Fig. 18) to the generator (Fig. 20).

The elimination of a group of 1200 connections appears understandable if one remembers that the relays RdarA to RddrA operate in conjunction with the corresponding storage tubes VbA 1-4 (Fig. 14) which are controlled by the sources Rd 1-4 which in turn identify four groups of 1200 subscriber lines each. In Fig. 17, the contacts RdajA, RdbjA are connected to the line 11 corresponding to the groups 1 and 2, which belong to the groups ι and 2, whereas the line 9, which corresponds to the groups 3 and 4, with the contacts Rdc JA, Wheel YES , which belong to groups 3 and 4.

Since only one of these relay contacts is closed, it is clear that only the pulse of the corresponding group can be transmitted to the generator from the ESBO-FAn direction of the cord connection finder.

In the coincidence network on the right-hand side of FIG. 20, the pulse sources Rc 1-4 pick up all sampling pulses which do not belong to the desired subgroup A or B on the grid of the tube CT 3 A in the comparator generator CRG 2 A.

The coincidence of the pulses Rc i -Rc2 characterizes the subgroup A, whereas the coincidence of the pulses Rc 2, -Rc 4 characterizes the subgroup B.

The renewed pulse ignites the tube BBVA and actuates relay YrA and relay WorA again in the same way as described for register scanning.

Via normally open contact Oa 3 A, the renewed pulse ignites one of the tubes VfAi- 5, which are controlled by the sources Ra 1 -5, one of the tubes VhA 1-4, which are controlled by the sources Rc ι -. \ , And immediately the renewed pulse ignites one of the tubes VgAi-S, which are controlled by the sources Rb ι - 5, according to the characteristics of the free cord connection set.

In the same way, one of the relays RfarA / RferA, one of the relays RgarA / RgerA, becomes one of the

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Relay RharAIRhdrA actuated according to the identification of the free cord set and held via its own contacts and the working contact Ob ι Α (Fig. 22).

The relay OcrA (Fig. 21) picks up via make contact Ob 3 A, a make contact of the anode relay of the group Ga2AjGe2, A, a make contact of the anode relay of the group Fa 2 AIFe 2 A, make contact Wo 1 A to earth.

Relay CmrA picks up again via normally closed contact Od 5 A and normally open contact Oc 6 A and deletes all storage tubes that were ignited. The initially applied earth potential of the relay OcrA disappears, but this latter relay remains drawn in series with the relay 'OdrA via its own normally open contact Oc ι Α .

Now the relays OarA, ObrA, OcrA, OdrA are all pulled, and relay CmrA drops out again. Its circuit is opened with contact Od 5 A ,

■ 20 and the anode circuits of the storage tubes are closed again, and the relay WorA is released with contact Cm 2 A.

A test procedure is initiated to ascertain whether the .E ₁ S ¹ BO device is free for the cord connection finder whose identification has been saved.

If this is the case, the test potential of +24 volts is applied via the normally closed contacts CF 4III, Tf 3III, Of3III, McIII, AfzlII in the above-mentioned ESBO device (Fig. 29) to terminal 10 in the "^" control (Fig connected. 17), from where it Co 3 A, break contact Hog A is transferred to the test circuit StA (Fig. 18) break contact Dp 9 A, Eo 4 normally closed contact A, open contact.

This works in the same way as was explained for the test of the first .E.S'-BO caller, with the exception that the tube SVA is ignited and relay TrA responds via normally open contact Co ι A instead of normally closed contact Cp 10 A. Relay DprA (Fig. 10) speaks of battery via normally open contact Co 4 A, normally closed contact Do 4 A, normally closed contact Eo 3 A, normally open contact TiA ■ to earth,

Via normally open contact Dp 8 A a potential of + 24Vo ₁ It or '■ -48 volts (Fig. 17) is applied via one of the contacts Rha 3 A, RHcT ₁ A or RHbT ₁ A, RHdT ₁ A , whereby relay Tfr III or OtrIII in the £ 5 "50 device for cord connection seekers (Fig. 29), according to group 1 to 25 or group 26 to 50 of the free cord connection set.

It should be noted that in the evaluator of the -EvS-SO device for cord connection seekers, the sources Pc 1 and Pc 3 correspond to the cord circuits 1 to 25, whereas the sources Pc 2 and Pc4 are assigned to the cord circuits 26 to 50. This explains the distribution of the contacts Rha 3 A, RhCT ₁ A, RHbT ₁ A, RHdT ₁ A, which correspond to the sources Rc 1, Rc 3, Rc 2 and Rc 4 that control the actuated tubes, via the anode relays, Relay RharA. . . (The sources Rc 1-4 have the same time slots as the sources Pc 1-4).

In the iiJT-BO device for cord connection seekers (FIG. 29) one, two or three of the relays Ar III / Fr III are actuated. Only one relay or none in each pair of Ar III and BrIII, CrIII and Drill, ErIII and .FrIII is addressed, depending on the contact combination of the relay RfaA. . ., RgaA. . . (Fig. 17, "^" control). This connects via the working contacts 3, i, 2 and the working contacts Dp 2 A, Dp 3 A, Dp 5 A a voltage of +24 volts or -48 volts with one of the three pairs of the mentioned relays. In. in each pair the left relay picks up at +24 volts and the right relay picks up at -48 volts.

This gives you 3 ³ - 1 = 26 combinations, one of which is assigned to one of the 26 vertical magnets. The .27. Combination (no relay picked up) is used for the rest position.

In the ESBO device of the cord connection finder, a vertical magnet (Fig. 28) is actuated according to the combination of the actuated relays ^ rIII-.Fr III, namely, via the working contacts of the above-mentioned relays, working contact Af2III (in the ESSO device for cord connection finder ), Terminal 10 and normally open contact Dp 9 A to earth (in the "^" control, Fig. 17). This causes the adjustment of the vertical rail of the multiple switch in the go cord connection set, which has access to two lines in groups 1 to 25, 26 to 50 or to the two test lines 51 and 52.

It should be noted that all multiple switches used in this application come, have no code rail magnets.

In the multiple switch, which is controlled by the -EvS-BO device for cord connection seekers, the selection bars and. Selection magnets omitted because only 50 outputs are operated by this multiple switch. The relay OtrIII or T fr'III (Fig. 29) responds to select one of the two lines, which can either be a line from group 1 to 25 or a line from group 26 to 50 or one of the Test leads 51 or 52.

The response circuit of the said relay is via contact 8 (Fig. 17), "^" control , normally open contact Dp 8 A, one of the contacts Rha 3 A, _{RHcT 1} A or one of the contacts RHbT ₁ A, RHdT ₁ A, +24 Volts or -48 volts closed.

The normally open contact DpioA (Fig. 18) triggers the test device, the tube SVA goes out, relay TrA drops out, and relay DorA (Fig. 10) speaks of a battery via normally open contact Dp 4 A ,. Normally closed contacts Ep 2 A, Fp ^ A, Tt, A to earth, and it is held via its own working contact Do 5 A and the working contact Bu 5 A.

If the relay TrA responds as a result of the test for the free switching state of the -EJi-BO device for cord connection seekers , the horizontal magnet HmR in the register (Fig. 32) attracts, via line 1/2 in the register, Normally open contact 1 or 2 in the »^ 4« control (Fig. 16), normally closed contacts Hm 5 A, ΖεΔ, Α, Ar-

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NC contacts Ta 4 A, Co 5 A, NC contact Ho 11 A to earth.

If the relay TrA drops out after the test, the magnet HmR is held in the working position via contact Dp 7 A and via working contact Do 6 A, which is parallel. The magnet HmR is held by the double contacts when the last-mentioned contact is opened in a further selection stage.

The relay LbrR responds in the register circuit (Fig. 32).

The relay HlmrA in the »^!« Control

(Fig. 16) responds in the following circuit:

Earth, normally closed contact Ho 11 A, open contact Do 6 A, closed contacts Ze 4 A, Hm 5 A, contact 1 or 2 (in the "^" - control), then in the register line 1/2, normally closed contacts Lg 3 R, Hb 2 R, working contact Hm ι R, closed contacts Lh 11 R, Lg4R, line 3/4, then back in. the "v4" control, work contacts 3 and 4, normally closed contact Zf 3 A, relay IiImA, -48 volts (Fig. 16).

When relay HlmrA is pulled in , relay HmrA via normally open contact Hm 1 A also pulls in.

The relay ZarA (Fig. 16) speaks of earth potential via the normally open contact Hm 1 A and the normally closed contacts Zd 3 A, Zb ι A. Although the contacts Do ι A and Za 1 A are closed, relay ZbrA cannot respond, namely because of the 3 "short circuit through direct earth with contact. Hm ι A.

The normally open contact Do 1 Ä closes the anode circuit of the SVA tube. The test circuit is then in the rest position again to determine a new one. Switching status. After switching off the tube in each group: VfAi ..., VgA ι ... VhA ι ... the line connection finder is scanned. The scanning for the first call seeker can be started via the ESB O facility for second call seekers (FIGS. 23, 24, 25).

The EJvBO facility for second call seekers corresponds to the desired group of 1200 subscriber connections. It contains two triodes CTiII, CT 2II (Fig. 23), each of which has the grid connected to an evaluator which scans 50 outputs (00 to 49 or 50 to 99) from a string circuit to six first caller groups, each 100 of which Subscriber 5 ”connections (e.g. groups 1, 2, 5, 6, 9, 10 or groups 3, 4, 7, 8, 12).

A total of 100 exits are checked, which are arranged for the first five caller groups are.

In order to separate the group of the first call seekers (100 connections), which are served by the scanned output, the branches of the evaluator (FIG. 23) through the pulse sources Pc 1 -4, Pe 1 -3 in ßi> example shown way controlled.

For the outputs 00 to 24, the outputs that serve the first caller groups 1, 5, 9 are assigned to the source Pc 1. The outputs that serve groups 2, 6, 10 are assigned to source Pc 4. The outputs that the groups. 1 and 2 are assigned to the source Pe 1. The outputs that serve groups 5 and 6 are assigned to source Pe 2. The outputs that the groups. 9 and 10 are assigned to the source Pe 3.

For outputs 25 to 49, the outputs that serve caller groups 2, 6, 10 are assigned to source Pc 2. The outputs that serve groups 1, 5, 9 are assigned to source Pc 3. The outputs that serve groups 1 and 2 are assigned to source Pe 1. The outputs that serve groups 5 and 6 are the source F <? 2 assigned. The outputs that serve groups 4 and 10 are assigned to source Pe 3.

For outputs 50 to 74, the outputs are the groups. 3, 7, 11 operate, assigned to the source Pc ι. The outputs that serve groups 4, 8, 12 are assigned to source Pc 4. The outputs that serve groups 3 and 4 are assigned to source Pe 1. The outputs that serve groups 7 and 8 are assigned to source Pe 2. The outputs that the groups. 11 and 12 are assigned to the source Pe 3.

For outputs 75 to 99: The outputs that the groups. 4, 8 and 12 serve are of the group; Pc 2 assigned. The outputs that serve groups 3, 7, 11 are assigned to source Pc 3. The outputs that serve groups 3 and 4 are assigned to source Pe 1. The outputs that serve groups 7 and 8 are assigned to source Pe 2. The outputs that serve groups 11 and 12 are assigned to source Pe 3.

It can be seen from this that each first caller group is identified by a source Pe , which has two sources. Pc are assigned, corresponding to the outputs 00 to 24, 25 to 49 for 600 connections, or the group of. Outputs 50 to 74, 75 to 99 for the other 600 connections (e.g. group 1 is identified by the sources Pe 1 and Pc ι in the output group 00 to 24 and by Pi? 1 and Pc 3 in the output group 25 to 49).

Among the two groups of 600 connections from which the identification pulses to the »^« control via terminals 11 and 9 for each group. (Fig. 9) arrive, the desired group of, 600 connections is selected by one of the contacts Rca 3 AIRcd 3 A, which are connected in parallel in pairs. This contact was closed as a result of the "^" control storing the identifier for the call tap, and each of these contacts identifies 300 lines.

The scanning pulses are transmitted via normally open contacts'

Oc 4 A (Fig. 17), Oa 8 A (Fig. 18) and normally closed contact Woj, A to the comparator generator CRG 2 A (Fig. 20).

All impulses that do not go to the calling part

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Subscriber group belonging to 100 lines are received by the coincidence network on the right-hand side of FIG. This network gives one of the supply sources Re 1 -3 via an actuated contact of the contacts Rea 3 A / Rec 3 A and working contact OcSA, one of the supply sources Rc 1 and Rc 2 via an actuated one of the contacts Rea ι Al Red 1 A and working contacts Oc 5 A, Oa 5 A, one of the supply sources Rc 3 and Rc 4 via an actuated one of the contacts Rcaj Al Red JA and normally open contacts Oc 3 A, Oa j A.

Since the combination of the actuated relays in the groups RearA, RdarA. . . RearA (which corresponds to the ignited tubes in the groups VcAi-4, VbAi -4, VeAi -3) identifies the identity of the stored call tap, ie the iooer group of the calling subscriber, so one can see that one source Re is combined with two Sources Rc (one of the group Rc i-Rc 2, the other of the group Rc 3 -Rc 4) identifies the desired group of 100 lines to which the calling subscriber line belongs within the 600 group.

The renewed pulse, which therefore corresponds to the one sampled output, which is the desired one Group of 100 connections served is transferred to the memory (Fig. 21).

The tube BBVA ignites again and relays YrA and WorA are activated, one tube in each group VfA 1. . . VgA 1. . . VhA 1 ... is ignited, and relay OerA responds via the contacts of the corresponding activated anode relays via the make contacts Od 1 A, Ob ^ A, make contacts of the anode relay, make contact Wo 1A to earth,

Since no other sampling is to be carried out for this call, all the tubes ignited in the memory of FIG. 21 remain switched on until the connection has been carried out, since relay OmrA can no longer be in operation.

Therefore all relays OarA, ObrA, OrcA, OdrA, OerA remain activated.

The EviT-BO device for the cord connection finder (Multiple switch) gives access to its own cord connection set when the vertical rail is actuated, from which the free switching state must be determined. This is done with a new test process.

The test potential is obtained via the ESBO device of the cord connection finder, and this is obtained via terminal 6 (Fig. 17), make contact Dp 6 A, break contact Ep 4 A, make contact Do 3 A, make contact £ 04 ^ make contact Co 3 A, break contact Hog A to the test circuit (Fig. 18) in the "^!" Control.

When the cord connection set is free, the tube SVA ignites and relay TrA responds. This triggers the response of relay EprA (Fig. 10), namely via normally open contact Do 4 A, normally closed contacts Eo 3 A, Fo 4 A, normally open contact T ι A. The relay EprA maintains its own normally open contact Ep 1 A and normally open contact D02A.

The anode circuit in the SVA tube is opened with contact Ep 5 A ; the SVA tube goes out, the TrA relay drops out, and the test circuit is switched off.

The relay EorA (Fig. 10) responds via normally open contact Ep 2 A, normally closed contact Fp4 A, normally closed contact T 2, A and maintains itself through its own normally open contact Eo 2 A and normally open contact Cg 3 A.

Normally open contact Eo 1 A sets the test circuit back to the rest position in order to be ready for the next test process.

The test process can be started immediately thereafter in order to determine whether the ESBO device is free for second call seekers via which the sampling of the outputs to the first call seekers was carried out.

If the mentioned .E.S'.BO device is free for second callers, a test potential of +24 volts is applied to the normally closed contacts Tf ₁ 3II, Ot 3II, McII, Af 3II (in the ESB O-Schahnng Fig. 25) , Terminal 10 (Fig. 9), normally closed contact FpgA, normally open contact Oe ι A, Eo4 A, CoT ₁ A (Fig. 17), normally closed contact HogA (in the "^" control) to the test circuit (Fig. 18) .

The tube 57 / M ignites and relay 7> y4 responds.

The relay FprA (Fig. 10) is operated via normally open contact Eo '-3 A, normally closed contact Fo 4 A, working congo clock TiA to earth. This relay maintains its own make contact Fp 1 A, break contacts Ze ζ A, Ho 10 A, make contact H 2 A to earth.

The open contact Fp 10 A switches off the test equipment , the SVA tube goes out and the TrA relay drops out.

The relay ForA (Fig. 10) responds via normally open contact Fp4 A and normally closed contact T 3 A to earth and maintains its own normally open contact Fo 2 A and normally open contact Cg 3 A. Closing of the contact Fo ι Α restored.

The working contacts Fp2A, Fpi A, Fp SA close the circuits for: one, two or three relays ^ rII to .FrII in the EJvSO device for second call seekers (Fig. 25), λνίε in connection with the ii ^ SO device for Cord connection finder explains via terminals 1, 3 and 2, depending on a potential of +24 volts or -48 volts, which is applied to one, two or three of the terminals, which of the contact combination of the anode relays FarA / FerA, GarA / GerA of the store in Fig. 21 are assigned. This combination identifies the scanned output to the desired first call searcher group for 100 subscriber lines.

The six mentioned relays ArII to -FrII thus result in 3 ³ - ι = 26 combinations. Each combination corresponds to one of the 26 vertical magnets of the multiple switch.

Relay Afr II responds in the EvS \ ßO facility for second call seekers. A ground potential is established by the normally open contacts A 2II, S 2II. . . F 2 II created.

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Therefore, one of the vertical magnets VII (Fig. 24) is actuated via the contact pyramid of the relays ArIIjFrII, make contact ^ / 3II (in the E5 \ ß O device for second callers), terminal 10 and make contact Pp 9 A to earth (in the "A " control according to FIG. 9). Actuation of the vertical magnet causes the corresponding vertical rail to be adjusted.

Each of the 25 first vertical magnets VII controls four outputs, namely in the groups 00 to 24, 25 to 49, 50 to 74, 75 to 99, whereas the vertical magnet 26 has the four test outputs 100, 101, 102, 103 controls, each one of the is assigned to four mentioned groups with 25 outputs.

A first separation between the four groups takes place by actuating one of the preselection magnets FFII, VSII (Fig. 25) in the ESB 0 device for second call seekers via the corresponding break contacts BfT ₁ II or Bf4II, OuII or 0i2lI, Tfill or Γ / 2ΙΙ, Terminal 4 or 6 (Fig. 9) in the "^" control, normally open contact Fp 6 A or FpJ A, normally closed contact Yc 2, A or Yc 4 A, one of the contacts RcagA, RcbgA or one of the contacts Rcc 10 A, Red το A, normally closed contacts Ya2A, Yb 5 A, normally open contact FpSA to earth. The activated preselection magnet initiates the setting of the preselection rail.
In the £ 550 device for second call seekers (Fig. 25), relay Bfr II responds in parallel with one of the preselection magnets VPIl, VSII , which was actuated via normally open contact Af 4II and magnetic contact Vp II or VsII.
Relay Bfr II and one of the selection magnets VP II, VSII are connected to earth via the two; parallel working contacts Bf 1 II and Bf ₂ II.

The rail contacts VBP 1II, VBP 2II or VBS II, V BS 2II of the preselection rail are thus closed and select two outputs or groups 00 to 24 and 25 to 49 or two outputs in groups 50 to 74 and 75 to 99 or two test leads 100, 101 or 102, 103 from.
The relay YarA ("^" - control, Fig. 9) responds either to normally closed contact Yb 6 A, a normally open contact Rcc 11 A or Red 1 1 A, normally closed contact Yc 3 A, normally open contact Fp6A, contact 4, then in the ESB O- Device for two call seekers normally closed contacts Tf 1II, Ot 1II, normally open contact bf 3II to earth or via a normally open contact Rca 10 A or Rcb 10 A, normally closed contact Yc 4 A, normally open contact FpJ A, contact 6, then in the ESB O device for Second call seeker normally closed contacts Tf 2II, 0t2lI, normally open contact Bf 4 II to earth.

Relay YbrA (Fig. 9) responds via normally open contact Ya ¹ ^ A and is held via its own normally open contact Yb 1 A and normally open contact Cg4A. In the ESB O device for second callers, one of the relays Tfrll, Oirll responds via terminal 8 ("^" control, Fig. 9) , normally open contact Yb 3 A, one of the anode relay contacts HcJ) A, FIdJ ₁ A to +24 volts for relay Tfr II or one of the anode relay contacts HaJ ₁ A, Hb 3 A to -48 volts for relay Otr II.

The response of relay Tfrll or Oirll enables relay YarA in the "^" control, namely when the contacts Ot 1II, Ot2 II or Tf ι II, Tf 2II open.

Relay YerA responds via normally open contact Yb 2 A and normally closed contact Ya 3 A.

With normally open contact Ot2 II or Tf 2 II, a further elimination of a single output in group 00 to 24 and a test of output 100 is carried out or in group 25 to 49 and a test of output 101 or in group 50 to 74 and a Check output 102 or in group 75 to 99 and one; Check output 103. The corresponding line is connected to terminal 6 in the »A« control in order to check the free switching status of the selected output. The checking process itself will be explained later.

In the ESB O device for cord connection seekers , after actuation of the relay ForA, the horizontal actuation magnet FIBaIII or HBb III (Fig. 29) responds via normally open contact Ot 1 III or Tf 1III, then contact in the "yi" control (Fig. 17) 4, make contact EpJ ₁ A, break contact Zb 4 A, make contact Hm 4 A to earth.

The horizontal actuating magnet HBaIII or HBb III is actuated according to the desired group 1 to 25 or 26 to 50 of the cord connection sets, whereby the connection of the register with the cord connection set via the wires h, f. . . c, d is produced.

When the said actuating magnet has responded , the circuit for relay HlmrA (Fig. 16) in the register (Fig. 32) with contact Lh 11 R of relay LhrR is opened, which. in the register via the working contacts Lb 1 R, FIb ι R responds.

The relays HlmrA and HmrA therefore drop out (FIG. 16).

The relay ZbrA short-circuited to earth is excited when the contact FIm 1 A opens and operated in series with relay ZarA via the normally open contacts Za 1 A and Do γ Α (Fig. 16).

The response circuit of the horizontal actuating magnet HBa III or FIBb III is opened with contact Zb 4 A or Hm 4 A , the horizontal switching magnet drops out, but the horizontal rails are kept in register in the working position by the horizontal magnet FImR.

The horizontal magnet FIL in the cord connection set (Fig. 30) speaks via the horizontal rail contact FIbe2L, normally closed _{contact CaJ 1} L, line g, then in the register (Fig. 32), normally open contacts Lh 2 R, FIb 2 R, _{normally closed contact LgJ 1} R, Line 1/2, then in the "^" control (Fig. 16) via the circuit for the horizontal register magnet HMR to earth (contact Hm 5 A is closed again).

In the "^" control, the relay HlmrA responds in the same circuit as with the one

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first tightening, but the circuit runs over the wires / and g to the cord connection set, where it is now closed via the normally open contact Hm ι L of the horizontal magnet of the cord connection set.

The relay HmrA picks up again, and relay ZcrA also responds again, via normally open contact Zb ι A, normally closed contact Zd 3 A and normally open contact Hm ι A (FIG. 16).

ίο Relay DprA (Fig. io) drops out, its circuit was opened by contact Zc ι A. The ESBO-SaXz for cord connection searcher is thus separated from the »^!« Control, since its function of connecting the cord connection set with the register has ended. All actuated relays in the mentioned ESBO-SaXz go back to the rest position.

Although the contacts Za 4 A and Zc 2 A are closed, relay ZdrA cannot respond because it is short-circuited with contact Hm 1A due to direct earth potential.

Before continuing with the connection from the cord connection set to the. The first call seeker is continued, the scanning of the calling subscriber line is now dealt with, which is taking place at the moment when relay CorA has responded .

In the ESB0-Sa.tz (1st caller) the output of the sampling circuit of the subscriber line is connected to the left grid of the double triode CTiI, CT 21 (Fig. 5). At the cathode of the triode CT 11, a pulse is generated in the time unit which is characteristic of the calling subscriber. This pulse is transmitted via contact 5 (Fig. 8) in the "^" control, break contact PaSA , make contact H 5 A, break contact Sf 2, A, break contact VO 5 A (Fig. 10) with the grid of triode VT 2 A transferred to the comparator generator CRGiA of FIG. This pulse is renewed in the following time unit without comparison with the reference pulses, da. Contact Pag A keeps the grid of the tube CT ι A at ground potential in the absence of the time pulse d $.

The renewed pulse is transferred to the memory (Fig. 14), where the tube BAVA ignites, which causes relay XrA to respond, then relay VorA to respond, as already explained, and via normally closed contact Pa 4 A, normally open contact Cp4.A , of the actuated relay CprA ignites one of the tubes VaA 1-5, which are controlled by the pulse sources Ra 1: -5, one of the tubes VbA 1 -5, which are controlled by the pulse sources Rb 1-5 and one of the tubes VcA 1-4, which are controlled by the pulse sources Rc 1 -4. The corresponding anode relays are activated.

The tubes remain ignited, but relay XrA drops out when contact Pay A opens, causing relay VoRA to drop out.

The open one. Contact Pa 9 A separates the earth potential from the grid of the CTIA tube and thereby makes it ready to receive the reference pulses transmitted by the coincidence network on the. left side of Fig. 12, for class identification of the scanning line.

Normally open contact PadA keeps the relay HrA (Fig. 8) attracted.

It is noted that the relay HrA is a slowly operating relay and therefore cannot drop out between the opening of its response circuit with normally closed contact Vo 2 A and the subsequent closing of the same circuit with normally open contact Pad A.

In the ESBO-SaXz (first call searcher, FIG. 7), one, two or three of the relays ArI to FrI are actuated, as already described in connection with the .E.S'.SO sentence for cord connection searchers, namely about the contacts. '3, 1, 2 (Fig. 8), normally open contacts Cp 2 A, CpJ ₁ A, Cp 5 A and a potential of +24 volts or - 48 volts, which is applied to one, two or three of the named contacts 3, 1, 2 according to the contact combination of the activated anode relays AarA. . ., BarA ... is created in the »^« control.

The relay Afrl in the ESBO-Sztz for first call seekers responds and accordingly one of the 26 vertical magnets VI (Fig. 6) via the contact pyramid of the relay ArijFri, working contact Af 2,1, contact 10 (Fig. 8) in the "^" -Control, normally open contact Cp 9 A, relay CwrA in series to earth.

In the £ 5jB0 device for call seekers the preselection magnet VPI or VSl (Fig. 7) responds in the same way as the ESBO device for second call seekers via K0n.ta.kt4 or 6 (Fig. 8) in the »^ « Control, normally open contact Cp6A or CpJA, normally closed contact Xc2, A or Xc4 A, one of the actuated. Contacts Cb 5 A, CcC ₁ A or one of the contacts Ca ζ A, Cd ^ A, normally closed contacts Xa 2 A, Xb $ A and normally open contact CpiA to earth.

Thus, two lines of. four lines selected, which were switched by the vertical magnet, via the normally open contacts VBP11, VBP2I or VBSiI, VBS2I of the set vertical preselection bar.

The relay BfrI moves in parallel with the magnetic code VPI or VS I via the operating contacts and Af 4I vpl or vsl (Fig. 7).

Relay Bfr I and the preselection magnet VPI or no VSI are held by ground potential that is applied via the two working contacts Bf 11, Bf 2 1.

Earth potential is applied via the working contacts Bf 31, Bf4I in the .E-SiSO-Einricritung for first call seekers to relay XarA in the "^" control, (Fig. 8). This pulls either via normally closed contact Xb 6 A, normally open contact Ca 3 A or Cd 3 A, normally closed contact Xc 3 A, normally open contact Cp6A, contact 4, then in the £ 5 * ßO device for first call seekers (Fig. 7), normally closed contacts Tf 11 and Ot 11, or via normally open contact Cc 3 A or Cb 3 A, normally closed contact Xc 4A , normally open contact Cp 7 A, contact 6, then in the ILS ¹ B O device for first call seekers (Fig. 7) through normally closed contacts Tf 2 1 and Ot 2I.

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Relay XbrA (Fig. 8) picks up via normally open contact Za 3 A and maintains its own normally open contact Xb ι A and normally open contact Co 6 A.

In the ESBO-JL'mr \ dat \ xng for first call seekers (Fig. 7) relay Tf r I or O tr I pulls via contact 8 in the "^" control, make contact Xb 3 A, make contact Ca 4A or Cc4 A to potential + 24VoIt for relay T / r ι or contact C & 4A or Cd4 A to voltage -48 volts for relay Otrl.

Thus, only one line is switched through via normally open contact Tf 21 or Ot 21 of two lines already connected by the preselection magnet VPl or VSI .

Relay XarA drops out, its circuit is opened by contacts Tf 11, Tf 2,1 or OnI, Ot2 1.

Relay XcrA (Fig. 8) picks up via normally open contact Xb2A and normally closed contact Xa $ A. This relay finally opens the response circuits of relay XarA with contacts Xc 3 A, Xc 4A. A new scan is now carried out for the class identification of the line via the £ 5 "5Ö facility for first call seekers.

The class identification of a subscriber connection (normal unrestricted subscriber, subscriber connection in, absence circuit, restricted subscriber connection, payphone with restricted operation, payphone with unrestricted operation) is carried out by two groups of sources Pd 1-11 ; one is applied to the line A 00/99, the other to the line .δοο / 99 of the scanner in the ESBO-Έϊη direction for the first call seeker FS (FIG. 5).

The class identification of the subscriber connection in the case of sampling pulses is now transmitted from the cathode of the right triode CT 21 in the mentioned .E ₁ Sf) 0 device via contact 9 in the "^" control, namely via normally open contact PaSA (Fig. 8) , Normally open contact HζA, normally closed contacts Sf 3 A, Vo 5 A (Fig. 10) to the grid of the tube VT 2 A in the comparator generator CRGiA (Fig. 12).

When contact PagA is open, the reference pulses of the coincidence network (on the left-hand side of FIG. 12) control the grid of the tube CTiA in connection with the time pulses d 3. There is a reference pulse of the sources Ra 1-5, a reference pulse of the sources Rb 1 -5, a reference pulse of the sources Rc 1 -5, which are connected via the contact of the corresponding anode relay, which corresponds to the characterization of the calling. Participant is closed.

Since the renewed sampling pulses for subscribers are delayed by a unit of time with respect to the original subscriber sampling pulse when the last pulse z. B. occurs in a time unit which corresponds to the coincidence of the sources Pa 2, Pb 3, Pci (time unit 37), the said pulse is renewed in the time unit 38 in accordance with the coincidence of the sources Ra 3, Rb ^, Rc 2 in the memory and ignites the tubes VaA 3, VbA 3, VcA 2, which correspond to the anode relays AcrA, BcrA, CbrA. This explains why in the coincidence network the sources i? Ai-5, Rc 1-S are connected via the contacts Ab 2 A / Aa 2 A, Cb 2 AJ Ca2A of the anode relays instead of the contacts Aa2AJAe2A, Ca2AJCd2A , as in the memory with regard to the same sources, and the corresponding anode relays.

In this case, the anode relay AarA is not activated, the sources Rb 1 - 5 are connected via the contacts Ba2AJBd2A and normally closed contact Aa4A, without using a circuit of the anode relay contacts. ___

In the case of a subscriber line to which the last source Pa 5 of the group Pa 1 - 5 belongs, e.g. B. in the time unit 15, which corresponds to the coincidence of the sources Pa 5, Pb? ,, Pc 3, the pulse in the time unit 16 is renewed, which corresponds to the control sources Ra 1, Rb 4, Rc4 in the memory. The tubes VaA 1, VbA4, VcA4 are ignited and the corresponding anode relays AarA, BdrA, CdrA pick up .

Since the source Pb 3 in the scanner corresponds to the source Rb 4 in the memory, it is clear that the contacts of the anode relays connected to the pulse sources Rb 1-5 in the coincidence network g ₀ must also be actuated. Since the anode relay AarA is now activated, the sources Rb 1 - 5 are now connected via the anode relay contacts Bb 4 AJBa4 A and normally open contact Aa 4 A.

The two impulses, which carry out the class identification of the subscriber connection, are renewed in the time unit which follows their coincidence with the reference sources Ra, Rb, Rc and applied to the memory (FIG. 14) via normally open contact Pa 4 A and ignite two of the tubes VeA 1-5, of which the anode circuits are closed via normally open contact Pa 1 A and normally open contact Pa 3 A for the tubes VeA 1 -3.

The tubes VeA 1-3 are controlled by the sources Rdg-11 , the tube VeA4 is controlled by the sources Rd 1-6 and the tube VeA S by the sources Rdγ-8.

Accordingly, two of the anode relays Ear to Edr are energized.

Coming back to the moment in which the relay YcrA has picked up , the free switching state of the first caller is determined by a test process, via the jEJvßO device for second callers either via working contact VBP 1 II or VBS 1 II and Ot2 II or via normally open contact VBP2II or VBS 2 II and Tf 2II in the mentioned. ESBO device, contact 6 in the "^" control (Fig. 9) Working contacts PpJA, YC4A, Fo '^ A (Fig. 9),, 120 £ 04 ^ 4, Co 3 A (Tig. 17), Normally closed contact HogA, test circuit (Fig. 18).

When the first caller is free, the tube SVA ignites and relay TrA responds.

Because the relay HmrA has responded because of the actuation of the horizontal magnet

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HmL in the cord connection set, the horizontal switch- through magnet HBa II or HBb II is now operated in the jE ^ -ÖO device for second call seekers (Fig. 25), via working contact Ot ι II, or Tf 1II, working contact 4 in the »^ «Control (Fig. 9), make contacts Fp6A, Yc 3 A, Zb 2 A, Hm 2 A, break contact Zd 6 A, make contacts Fo 4 A and Ti A, earth (Fig. 10). When the horizontal through- connection magnet HBaII or HBbII is activated, the cord connection set is connected to the desired caller with the aid of the contacts AL, BL, CL, DL, EL (FIG. 30) after the horizontal through-connection bar has been actuated.

The circuit for the response of the relay HlmrA (»^« - control) is opened with contact HB 2 L in the cord connection set.

The relay HlmrA drops out and causes the disconnection of relay HmrA.

The relay ZdrA can now respond in series with the relay ZcrA , via the normally open contacts Zc 2 A and Za 4. A, since the short-circuiting earth is removed when the contact Hm ι A ("^" - control, Fig. 16) is opened would.

The horizontal actuation magnet HBa II or HBbII falls off, the horizontal rail remains closed in connection with the horizontal magnet HmL in the cord connection set.

The horizontal pressure magnet HmF attracts in the first call seeker, via normally closed contact HB 2 F, line c, in the first cord connection set CL, normally open contact HBl 2 L, line g, in the register line 1/2 to earth in the "^" Control (Fig. 16).

The relay HlmrA in the "^" control responds again, which is connected in parallel via line 3/4 in the register, line /, contact DL in the cord connection set (Fig. 30), normally closed contact Hb 1 F, normally open contact Hm 1 F in the first call searcher to earth of the horizontal magnet HmF (Fig. 4).

The relay HmrA thus also responds again and causes the relay ZerA to respond (in the "^" control, Fig. 16) via normally open contact Hm ι A.

Relay ZfrA cannot respond in spite of the normally open contacts Ze ι A, Zd ι A because it is short-circuited at contact Hm 1 A due to direct earth potential.

The relay FprA drops out, since its circuit through contact Zi? 5 A is opened. The ESBO facility for second call seekers is thus separated from the "^" control. Your function of interconnecting the first caller with the cord connection set has ended. All relays activated in the £ 5 \ B0 device return to the rest position.

In the £ 5 "J5O device for first call seekers (Fig. 7), the horizontal switching magnet HBaI or HBbI responds via normally open contact Ot 11 or Tf il, normally open contact 4 in the" ^ "control (Fig. 8), Working contacts CpOA ₁ XcT) A, Zd2A, HmT ₁ A, CwiA and the 'contacts of the anode relays, which characterize the class of the subscriber connection, to earth.;

This is the connection of the first. Call searcher with the subscriber line through the contacts AF, BF, CF, DF, EF (in the first call searcher, Fig. 4) completed by operating the horizontal rail.

The circuit of the relay HlmrA of the "^!" Control is opened via normally open contact HB 2 F in the first call seeker circuit, so that this relay drops out and the relay HmrA switches off.

The horizontal switch- through magnet HBa I or HBb I drops out, the horizontal operating rail remains in connection with the horizontal magnet HmF in the first one. Call finder on hold.

Relay ZfrA responds in series with relay ZerA , namely via normally open contacts Ze 1 A, Zd 1 A, since the short-circuiting earth potential with the open contact Hm 1 A is suppressed.

The relay LfrR speaks in the register (Fig. 32) of soil (Fig 16, "^" -. Control), and via make contact Zf 1 A, resistor R 14g A, rectifier G 49 A, the parallel-connected relays LFRA , Normally open contact 5 or 6, then in the register via line 5/6, normally closed contact Rg4R, winding of relay LfrR to -40 volts.

In the register, the response of the relay LfrR then causes the actuation of the relays HrR and LgrR.

Furthermore, direct earth potential is applied to the line 5/6 in the register, namely via the working contacts Lb 2 R, Li3R, CogR and working contact Is ι R of the step switching relay IsrR, which was activated as soon as the first caller connected to the calling subscriber would.

Thus the relay LfrA responds in the "^" control (Fig. 16), a current flows from earth in the register via line 5/6 (in the opposite direction than the current which has actuated the relay LfrR), normally open contact 5 or 6 in the "^" control (Fig. 16), winding the relay LfrA (the rectifier G 49 A is now blocked) to the connection point of the resistors!?. 14g A, R 150 A in the potentiometer between earth and - 48 volts. , 110

A ground potential is given to the register by the "^" control, and zAvar via the chain of anode relay contacts (e.g. Ea4A, Ed2A), working contacts Lf ι A, Zf 3 A, contact 3 or 4, line 3/4 in the register, Normally open contact Lg 4 R to terminal 96 in the register. Another earth is given to the register in the same way by the "^" control via the identification of the anode relay contacts (e.g. EbiA), normally open contacts Lf 3 A, Ze 4 A ₁ normally closed contact Hm 5 A ₁ line 1 / 2 in the register, normally open contact Lg 3 R ₁ to terminal 97 in the register.

The class of the subscriber identification has thus been transferred to the register. the Terminals 96 and 97 are connected via jumper lines to the connections of the

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Relay AsrR, CnrR in the mentioned register (Fig. 36).

In the "^" control (Fig. 10) relay BmrA responds via normally open contact Lf 2 A , all tubes in the memory (Fig. 14) go out, the corresponding anode relays drop out and thus relay ParA too.

The relay HrA drops out through the open contact Pa6A , whereby the disconnection of all the relays is caused one after the other, which were actuated in the control system including relay BurA , so that relay SfrA (Fig. 8) responds again and the »^« - brings the control to the rest position.

In the register circuit (Fig. 32), dialing characters are transmitted to the calling subscriber via the normally closed contacts As 9 R, Fi 7 R, Lk 12 R, normally open contact Lh 12 R, winding IV of relay I sr R, normally open contact Lf 2 R, line b in the cord connection finder, cord connection set, call finder, subscriber loop, back via line a, normally open contact Lf 1 7 ?, winding II of the relay IsrR to earth.

The calling subscriber can now dial the required code.

The relay LmrR (Fig. 33) is switched off by opening the contact Li4R.

The »^« control is enabled, relay CorR (Fig. 32) also drops out and then relay TarR (Fig. 33) by opening contact Co 5 R.

The register circuit is kept under control of the subscriber loop, relays LbrR (Fig. 32) is still held over contact Is R 1. The selective current surges influence the pulse relay IsrR, which transmits the current surges to a group of nine counting relays, namely IUrR ₁ IbrR, IerR and larR-IfrR (Fig. 33) via the normally closed contact Is 1 R, normally open contact Li4 R, normally open contacts C 03 R, Lk 11 R ₁ FJt ₁ R and the contact combinations Ib τ R. Jc ι R, Ic 2 R, U12R, IaiR, Ia, 2R, Id ι R, Jb ι R ₁ 'JaR, JaiR, Ja ^ R, Jf 1 R accordingly the number of pulses.

In parallel to these counting relays, relay LmrR is continuously activated during each pulse series and closes the response circuit for relay TarR (Fig. 33).

Relay TyrR (Fig. 33) was actuated via

NC contact Γα3 7? and normally open contact LhSR, when relay TarR dropped out, and is kept actuated when relay TarR responds again via normally open contact Lm 1 R.

The first three counting relays IarR, IbrR, IcrR are actuated by two pulses for each cycle as follows:

If relay IsrR drops when the subscriber loop is opened for the first time, relay Iar is energized via normally closed contact Ib 1R. When relay IsrR responds again, relay IbrR is connected in series with relay IarR via normally closed contact Ic 1 7 ?, normally open contact Ty ι 7? excited because the short-circuiting earth with contact Is 1 R has been removed.

If relay IsrR drops out on the second pulse, relay IcrR is activated via normally open contact Ib 1 7? and the primary winding of relay IbrR, which is connected in parallel with a 400 ohm resistor, energizes.

Contact Ia R opens the holding circuit for relays IarR and IbrR , relay IarR drops out, but relay IbrR remains in series with relay IcrR via its second winding.

When relay IsrR switches relay IbrR on again, relay IcrR drops out.

The cycle of two dialing pulses is counted by the three pairs of counting relays: JarR / JbrR, JcrRjJdrR, JerR / JfrR. '

When relay IarR responds for the first time, it closes the response circuit for relay JarR via the working contacts Ty JR and Ia 2 R and the normally closed contacts Jd 1 7 ?, Jb 1 R.

Relay FkR (Fig. 33) is switched on via the make contacts Yes 4 7 ?, LhSR .

The Wählzeichenstromkreis (Fig. 32) is opened with contact FiyR, relays firr adheres by its own contact Fi 1 R.

If relay IarR drops out, relay JbrR responds in series with relay JarR via normally open contact Yes ι R, normally closed contact 1 7 each? and working contact Ia 1 7 ?; the short-circuiting earth is with contact Ia 2 7? taken away.

The second pulse from relay IarR successively energizes relays JcrR, JdrR, and a third pulse from relay IarR successively energizes relays JerR, JfrR.

When relay JerR responds for the first time with the fifth dialing pulse, relays IarR, JbrR drop out by opening the contact 1 R each . So contact is also Yes 3 7? opened, but the relays / "'7 ?, IcIrR held actuated via the normally closed contact // 1 R. In the sixth choice impulse speaks relay JfrR, and the relay JcrR, JdrR fall off because contact // 1 7? is open.

Relays JarR and JbrR are then used to count the fourth pulse from relay IarR and relays JcrR and JdrR are used to count the fifth pulse from relay IarR.

Fig. 38 shows the relays which are actuated at the end of a series of pulses, and accordingly the number of pulses in a pulse train, d. H. the number of digits of the selected digit.

After receiving the number in the counting relay, no the digits are stored consecutively in a group of four relays, one for each digit is provided in the following manner.

At the end of a series of pulses, relay LmrR drops out and opens the circuit of relay TyrR (Fig. 33) with contact Lm 1 7?, Whereby said relay begins to drop out. The response circuit for relay TarR is opened with contact Lm2 R , but the latter relay is activated via its own normally open contact Ta 17? and one of the earthed contacts Yes 2 R, Jc 2 R, 2 7 each? held.

In Fig. 34 are via normally closed contact Lm 3 R, normally open contact TagR and the normally open contacts which correspond to the actuated counting relay at the end of a pulse series, one, two or three of the

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Relays AarR to AdrR operated according to the selected digit and as shown in FIG. 38.

The relay TyrR is a delay relay to guarantee the response of the storage relays AarR to AdrR. When relay TyrR drops out, the holding circuit of the actuated counter relays is opened, and thus the response circuits for the storage relays are also opened. However, due to their own working contacts to earth, these remain in series with relay AerR via working contact Fi 6 R , which with its working contacts Ae 3 R, Ae 4 R ₁ Ae γ R, AeSR is the next group of storage relays BarR / BdrR with the contacts of the Counting relay for storing the next digit connects.

Since relay TarR has also dropped out when the counting relays are in the rest position, relay TyrR responds again to prepare the holding circuit for the said counting relays when the next digit is received.

■ This digit is stored with relays BarR to BdrR in the same way as with relays AarR to AdrR for the first digit. At the end of the pulse series, relay BerR responds to switch to the next group of ¹ storage relays CarRjCdrR for the third digit. This process is carried out until the fifth digit is stored in the relays EarR to EdrR , while the sixth or last digit remains stored in the nine counting relays IarR / IcrR, JarR, JfrR of FIG. These are held by earth potential with contact Ei 6 R , which replaces the earth potential via contact Ty 1 R. Relay EirR was activated in parallel with the relays EarR / EdrR when relay EerR responded , via the normally open contacts Ty 2 R, Ee τ R and normally closed contact EfgR, and then holds via its own normally open contact Eil R and normally open contact Fi2R (Fig. 34 ). Assuming that the exchange has a capacity for 10,000 subscribers, in the case of a local call the common hundred-thousand digit and the ten-thousand digit that identifies the exchange must be sent first (six-digit number), and then the thousand digit (a limited number of the thousands can only be can be used, e.g. four, if the office is not fully developed, e.g. only for 4000 subscribers).

Assume that the group of tens of thousands "86" denotes an office which only 4000 subscribers served by the thousands digits i, 2, 6, ο (lines 1000 to 1999, 2000 to 2999, 6000 to 6999, 0000 to 0999).

If the subscriber dials the hundreds of thousands digit "8" and the storage relays AbrR, AdrR have been caused to respond, the corresponding relays ZbrR, ZdrR are also activated via the contacts Ab 2 R, Ad 2 R and Be 8 R. Relay AerR also responds.

Relay LarR (Fig. 33) responds via terminal 33, which is connected to terminal 8 in the contact pyramid: Zaζ R, Zb 2R, Zc8R, Zd2R, Be-jR,

Relay LarR connects via contacts La 1 R and Lg ζ R. '

When the ten thousand digit is stored (relays BdrR and BerR are activated) the relays ZbrR, ZdrR drop out through the contact Be8R . Earth is now applied to terminal 16 (Fig. 33) via the contacts La2R, Be 2 R, Bd2 R, Bc3 R, Bb 2 R ₁ Ba 2 R.

Terminal 16 is connected to terminal 40 of the relay pyramid CarR / CerR (in the right part of FIG. 33); Likewise, the terminals 22, 21 of the pyramid (corresponding to the thousand digit 2, 1) are connected in parallel with the terminal 36, which leads to the relay LorR (in the left part of FIG. 33).

In this way, when the thousands digit (either 2 or 1 for a switch of 2000 lines) is stored in the storage relay CarRICdrR, relay CerR is activated. Relay LorR speaks via the earth given via terminals 16 and 40 or via one of terminals 22, 21, terminal 36, contact Sm 8 R, winding LorR, battery. For example, the thousands digit is 2, then only operated relay CBRR of the memory relay CarRICdrR, and also relay Cerr. A connection is therefore established between the terminals 40 and 22 via the contacts Ce 2 R, Cd 3 R, Ca 4 R, Cb 4 R.

The actuation of the relay LorR indicates a local call. The call potential is applied to point Ef 2 R (Fig. 37) in order to occupy a control device "ß" as follows: +24 V, contacts Es 7 R, Bs 4 R, Lo 1 R, Ce 5 R, Ty 6 R and Ta 10 R.

This circuit is closed via contact De 2 R when the hundreds digit is stored in the storage relay DarR / DdrR and the relay DerR has responded.

The free control device "5" searches for the call potential of the memory, whereby the memory circuits can be determined by the temporal position of the call potential.

To prevent two or more control devices "5" from accessing the same call memory check, each storage circuit is in a different time position by each control device "5" scanned so that the ringing potential is switched off before a second control device scans the same storage circuit, although a direct test circuit is available, to lock the circuits against double occupancy. __

In the control device, “!?” the search process for a call register is completed in a scanning device which is shown in simplified form in the lower part of FIG. A detailed illustration is shown in FIG. 69 for three groups of six memories A 1, A 2, one place and two main memory devices.

The common starting point of the scanning device is connected to the tube VTiB , so that the scanning pulse at the output of the scanning device produces a positive pulse at the cathode of this tube (Fig. 41).

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As usual, the relay SfrB (Fig. 43) is activated, so that the impulse is transmitted via the contacts Sf ι B, Es?, B, Bm 4 B, terminal uB to the comparator renewer CRGB (Fig. 42), which, like ' already mentioned, works in conjunction with the control device "A" (Figs. 12 and 13). The the control device "i?" Allocated sampling time is determined by the required coincidence of pulse sources Rdx, Rex in the matching network (upper part of Fig. 42) and is applied to the terminal VB via the contacts PC14.B and F'a 3 B.

A detailed example of the connection of the sources Rdx, Rex for each control device B, corresponding to the total number of all control devices "B", is shown in the table of FIG.

The pulse renewed at the output terminal xB , which is emitted in the time unit that follows the scanning pulse, is transmitted via the contacts Βιίτ, Β, PcSB (Fig. 43) to one end of the control electrode of the cold cathode tube BAVB and to the other end of the control line of the cathode tubes VaB 1-5 applied or controlled by the sources Ra 1-5 in connection with cold cathode tubes VaB 1-5 or by the sources Rb ι - 5 in connection with the cold cathode tubes VcBi-A ₁ . or controlled by sources Rc 1-4 in the recorder.

The anode circuits of the cold cathode tubes VaBi-ζ, VbBi-S are closed via the contact Bin 3 B , as well as the anode circuits of the cold cathode tubes VcB 1 -4 via the contacts Ok 5 B, Pha $ B and Bm 3 B. In this way, the tube BAVB, one of the tubes VaB 1 -5, one of the tubes VbBi-S and one of the tubes VcB 1-4 in the registration device (Fig. 43) ignited.

The VorB relay is activated in the anode circuit of the BAVB tube. Likewise one of the anode relays AarBIAerB, one of the anode relays BarBI BerB and CarB / CdrB.

The activation of one of these anode relays causes the activation of one of the relays HaarBI HaerB, HbarB / HberB via the contacts Aa 2 B / Ae2B, Ba2BIBe2.B, relay VirB in series connection (this relay is activated) and contact Sa 4 B (Fig. 46) .

Via the contact pyramid of the HaarB relay. . ., HbarB. . . (Fig. 47) one of the connection relays RRB (Fig. 40), which corresponds to the call memory, operated in series with the relay RarB .

If relay VorB is activated, relay DfrB (Fig. 41) responds via contacts Vo 6 B, Ho 11 B (Fig. 41). Relay BurB (Fig. 43) speaks via contact Vo ißan and is maintained via contact Df 7 B.

The circuit for the relay SfrB (Fig. 43) is opened by the contact Bu 4. B , so that the relay drops out and relay FtrB (Fig. 45) responds. Earth is applied via contacts Xd4B, Xc2B, Pha2B and BuSB . When contacts 1 to 11 are closed by the activated connection relay, corresponding to the call memory, the memory is controlled via contact Bx 2 R, wire 7 (memory, Fig. 39), control device B (Fig. 40), contact 7, contact A4. B, contacts Vo 7 B, Df 4B, resistor R121B and -48 V battery short-circuited.

Relay DprB (Fig. 40) is actuated via + 24 V, contacts LgSR, Bx 4 R, wire 6 (memory, Fig. 39), control device B (Fig. 40), contact 6, contact A 8 B, contact Df 3 B, relay DprB, rectifier G6t, B, earth. The relay is blocked via contact Dp 2 B so that the relays DprB of other control devices B cannot be operated.

The circuit for the relay HrB runs via earth, contacts Ra 2 B, DfgB, DpiB, relay HrB to the battery (Fig. 40).

The actuated relay RRB is blocked via the contact Ht ₁ B (Fig. 40). Relay RarB is short-circuited to earth via contact H 3 B and drops out.

Relay DfrB is held via contact H 5 B (Fig. 41).

Relay HrB is held in series with relay AxrR , which is stored in the memory device via contacts H 1 B, Df 5 B, contact 1 (control direction B, in FIG. 40), via the memory (FIG. 39), wire 1, contact Li 2 R, contact BsT ₁ R, relay AxrR and earth is addressed. As soon as the relay AxrR has picked up, the relay BxrR in the memory (Fig. 2) also responds via the contact Ax 2R. Contact Bx4 R opens the circuit for relay DprB (Fig. 40). The relay drops out.

In FIG. 41, the relay ArB is operated via the contacts H2B and Dp 3 B and relay BrB via the contact A 7 B.

Relay BmrB (Fig. 43) responds via contacts H4B, Rb 9 B, Vo2B and Vi 1 B. The tube BAVB and the tubes of the recording device which had ignited extinguish. The anode circuit is opened by contact Bm 7 B for the tube BAVB and by contact Bm 3 B for the tubes of the recording device (Fig. 43).

The relay VorB (Fig. 46) drops out. Also the relays HaarB / HaerB, HbarB / HberB and VirB. Relay BmrB drops out because the earth at contacts Vo 2 B and Vi 1 B is disconnected.

Relay RbrB is activated via contacts Bm6B, Ra4B and Ii6B (Fig. 47).

Now the registration of the group identification of the first group selector takes place Connection set is connected.

A pulse that characterizes this group identification is now from wire Z (Fig. 48) in the ESBO to the first group selector via wire Z (Fig. 31) in the connection set, contact Ca 4L, wire d (Fig. 32, register ), Contact Lh 7 R, contact SxT ₁ R, wire 3, control device "B", contact 3, contacts KC4B, Pha ^ B, Vi s B, contact Rb 2 B, contact Pha 3 B (Fig. 40), contacts Sf 5 B, EsT ₁ B, Bm 4 B (Fig. 41, 42) for

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Transfer comparator update CRGB in Fig. 42 (terminal UB) .

It should be noted that the correspondence network (left part of FIG. 42) has no sources of supply, since the terminal VB is now grounded via the contacts Bu $ B and PagB.

The pulse that marks the group identifier of the first group selector is renewed in the same unit that follows one of this first group selector corresponding, and via the output terminal XB of the comparator renewer, contact Bu 3 B to the tubes VaB 1 -5, VbBi-S and Transfer tube VdB back. Since a first group selector is identified by two P <i sources at terminals FIG (Fig. 48) in the ESBO , the tubes are ignited. Since there are eleven tubes arranged there, 55 combinations can be obtained to designate 55 groups of first group selectors. As a result, two relays from the HaaRBIHaerB, HbarBI HberB relays respond in series with the VirB relay. One of the connection relays ERB (Fig. 44) is actuated via the corresponding contacts (Fig. 47) and thus the control device "5" is connected to the ESBO of the first group selector. Relay ParB (Fig. 46) responds via contact Rb 5 B and is linked via its own contact Pa 1 B. and Bu6B. The circuit for the relay PharB is closed via the contact Pa 6 B.

Relay RcrB (Fig. 44) is actuated via the M terminal and ground on the contact of the link relay to indicate the first group selection.

In the memory device (FIG. 37) the relays CgrR and CfrR are operated in series via the wire 8, control device "5" (FIG. 41), contact 8 of the connecting relay of the memory, contacts Ts 3 B and Rc ι B. In the memory device, the relays ZarRIZdrR respond according to the thousand digit that is stored by the relays CarR / CdrR via corresponding contacts of the groups Cf 3R, Cf4R, Cgi R, CgT ₁ R of the group Ca 5 RICd 5 R.

Correspondingly, earth is connected to wires 4, 5, 6 and 7 in order to make the corresponding relay ZarBIZdrB (Fig. 40) respond in the control device "B". At the same time the relay BmrB (Fig. 43) responds via the contacts H4B, Pa s B, Vi6B, Ok 6B, Rc3 B, Pc4B and is bound via its own contact Bm 2 B (Fig. 43). In the registration facility , the tubes are deleted and thereby the HaarB relays. . ., HbarB. . . as well as relay VirB brought to waste. Relay SarB responds via the contacts Ma 4 BIMb 4 B, PhaiB, vij, B (Fig. 46). Relay BmrB drops out because the circuit through contact Say B is open. Relay ZerB (Fig. 41) responds via contacts Bm4B, ES4B, Ft 6 B and the actuated contacts of group Za 1 Bl Zd 2 B.

In the memory the relay SxrR (Fig. 36) responds via the contact Cf 2 R as well as in the connection set (first group selector) relay CarL (Fig. 31) via the wire i and in the memory the contacts Lh 3 R and Sx 2 R (Fig. 32) are operated.

A free output of the desired group is now scanned via the ESBO connection set in the first group selector, which contains a scanning device on the grid of the tube CT 1TV (FIG. 48). Further details of the connections are shown in FIG. The pulse, which marks a free output, is generated by the cathode of the tube CT 1 N. contact 11 (Fig. 44) of the ESBO connection relay via contacts Ze 5 B, Sa ^ B, Ft 3 B (Fig. 44), contact Pha 3 B (Fig. 40) and contacts 5 "/ 5 Z ?, EsT) B, Bm4B (Fig. 41, 42) are transmitted to the comparator renewer CRGB (Fig. 42).

The comparator refresher is controlled by the match network (Fig. 42). The 8c earth at terminal VB is suppressed by contact PagB.

In the comparison network, the sources Rd ι -11 via the contact pyramid of. Relay ZarBIZdrB and the contacts Pa 3 B and Pb 3 B applied to the terminal VB of the comparator renewer CRGB .

In the ESBO for the first group selector, the scanning device for the free output on the grid of the tube CT 1 N is controlled by the sources Pd ι-11 , which are applied to the terminal A (Fig. 48). Each Pd source corresponds to a level (thousands digit).

In this way, the required selection level, in which a free output must be identified, is selected in the comparison network through the combination of the relay contacts ZarBIZcrB . This marks the thousands digit and only one Fci source is applied to terminal VB . .

The pulse renewed at the output terminal XB of the comparator CRGB is indicative of a free output in the required level. This renewed pulse is transmitted back to the registration device (FIG. 43) in the manner already described and passed via the contacts Bu 3 B, PaSB, PcSB . In this way the tube BAVB, one of the tubes VaB '... passing through the sources Ra ι-ζ, one of the tubes VbB ... passing through the sources Rb ι-ζ, no and one of the tubes VcB. . ., which are controlled by the sources Rc 1-4, ignited. The anode circuits of the tubes VaB. . . and VbB are closed via the contact Bm ^ B and the anode circuits of the tubes VcB ... via the contacts Ok s B, Pha $ B, Ft 4 B, A2B . The corresponding anode relays AarB. . ., BarB. . ., CarB. . . are actuated and in turn cause the corresponding relays in the groups HcarBIHcerB, HdarBIHderB (Fig. 46) to be actuated via corresponding relay contacts and contacts Sa45, Sa6B. When the tube BaVB has ignited, the relay VorB (Fig. 43) is activated again and thus also the relay PbrB (Fig. 46) via the contacts Pa 7 B and Vo 4 B. Relay PbrB is bound via the contact Pb 1 B. . relay

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PerB (Fig. 46) is via the contacts of the actuated relays in the groups HdarB. . ., HcarB. . ., Anode relay contacts of groups Ca6B / Cd6B and contact Pb 5 B actuated and bound via contact Pc 6 B.

Relay BmrB (Fig. 43) is made to respond again via contacts H4B, Pc2B and Sa2B. The BmJ B contact opens the anode circuit of the BAVB tube and extinguishes the tube. Relay VorB drops out. By contact Bm 3 B, the anode circuits of the tubes VaB. . ., VbV. . . opened and the corresponding tubes extinguished and brought the anode relay to Alifall. The anode circuit of the tube group VcB. . . remains closed. The corresponding tube remains ignited and the associated relay is activated.

Since the corresponding group contacts Aa 1 Bl Ae ι B, Bai BIBe 1 B are open, the relays MarB, MbrB can now be in series with the relays HcarB. . ., HdarB. . . respond via the contacts of these relays and contacts A 5 B, A 6 B, Ok 3 B, Ok 4 B and Ft 2 B. The short-circuit earth at contact Sa 4 B is switched off (Fig. 46). The SarB relay drops out because the circuit through the contacts Ma 4 B and Mb4B is open ..

The scanning process for the class of the output now takes place, at which it is indicated whether a local call is present or a special service call or a call for an outgoing connection. This process takes place in the ESBO , first group selectors (FIG. 48) take place, a scanning device being shown in a simplified representation on the grid of the tube CT2 N.

Details are shown in FIGS. 73 and 74. Two control sources Pd are applied to the terminals E and D of the scanning device shown in FIG. 48, which control sources correspond to the next selection stage which is connected to the output.

The class of the output scanning pulse which is generated at the cathode of the tube CT2N is transmitted to the contact 9 of the control device B (Fig. 44) and from there via the contacts PcSB, SaJ ₁ B, FtJ ₁ B (Fig. 44 ), Phaj, B (Fig. 40), Sf 5 B, Es 3 B, Bm 4 B (Fig. 41, 42) to the comparator renewer CRGB (Fig. 42), in which the pulse is stored in the manner already described.

The correspondence network (Fig. 42) is now connected via the contacts Pb 3 B, PbSB and Pc 3 B to the pulse sources Ra, Rb, Rc according to the contact combination of the activated group relays FIcarBIHcerB, HdarBIHderB , which, as already mentioned for the control device A , are also arranged to account for the delay of a unit of time in the comparator renewer. The renewed pulse is transmitted to the registration device (Fig. 43) via the contacts Bu 3 B, PaSB, Pc 8 B , where it detects two tubes from the cold cathode tubes VaB. . . ignites, which are controlled by the sources Re ι -5, or by the cold cathode tubes VbB. . ., controlled by the sources Rd 6-10, or the cold cathode tube VdB, which is controlled by the source Rd 11. Accordingly, two of the anode relays AarB. . ., BarB. . ., DarB actuated, which in turn causes the relays HaarB ... , HbarB ... in series with the relay VirB (Fig. 46) to respond.

One or none of the relays SprB, MtrB, OjrB of the contact pyramid in the upper right part of FIG. 47 is actuated. Relay OjrB responds to an outgoing connection, Relay SprB or MtrB for a special service call, and none of these relays are activated in the case of a local call. In the right upper part of FIG. 47, for example, the terminal 1 to the terminal 21, terminal 2 to the terminal 20, terminal 3 may be connected to the terminal 22, so that the relay spr B, MTRB, OjrB earth via the contact Since 1 B and get the corresponding contacts Haa 6 B / Hae 6 B and these relays are bound via their own contacts and the BuyB contact.

The actuation of the relay SprB or MtrB or OjrB for non-local calls causes the actuation of the relay TsrB (Fig. 41). With the contact TsJ ₁ B the earth is separated from the contact 8 (Fig. 41) and thus also from the wire 8 in the memory, in which the relays CfrR, CgrR are brought to waste. As a result, the relays ZarR / ZdrR in the memory also drop out, as do the relays ZarB / ZdrB and the relay ZerB in the control device "ß" (Fig. 41).

When relay MtrB or SprB (special service call) is actuated, relay KcrB (Fig. 41) ■ responds via contact Sp 4. B or Mt 6 B and applies earth to wires 9 and 11 of the memory via contacts Kc 2 B and Kc 5 B. If relay OjrB is activated (outgoing connections), relay KcrB remains in the rest position. Ground is applied to wires 10 and 11 in the memory through contacts Oj 2 B and OJ4B (Fig. 41).

The selection is ended by time means, not shown, since only the process of a local call is to be explained.

It should be emphasized, however, that a main feature of the control device "B" is that it is able to determine the class of the output (outgoing connection, special service, local call) in the course of the election and to indirectly initiate the corresponding operation of the memory, which is purely no wait and see in nature, unlike previous systems where one of the functions of memory was to accomplish this selection.

In the case of a local call, none of the relays SprB, MtrB, OjrB is activated. However, relay MsrB (Fig. 46) responds in series with one of the connecting relays ERB for the third group selector (Fig. 44). However, this connection relay cannot respond because the current in this circuit is weakened.

If relay PbrB is activated, a follow-up test can take place to check the free condition of the ESBO for the first group selector. If this ESBO is free, a potential of +24 V (Fig. 49) is applied via the contacts _{TfJ 1} N, OtJ ₁ N,

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McN ,. AfT ₁ N, control device »ß« (Fig. 44), contact 10, contact CpiοB, ΗοιοΒ, Pb2B to the follow-up test circuit STB in Fig. 45 applied. The cold cathode tube SVB ignites. Your anode circuit is connected to +24 V via contacts Xa 4 B, Okg B and Df 1 B.

The relay TrB is operated in this cathode circuit.

The follow-up test circuit is controlled by pulse sources Rax, Rbx , so that the control device B can only test in a certain time.

The distribution of the sources Rax, Rbx for each control device "5" is shown in the embodiment of FIG. Ji .

Relay CprB (Fig. 45) is activated via contacts Df2B, Ho 8 B, Xb3B and TiB . In this way, the connection between the control device "2?" And the ESBO for the first group selector is completed by contacts of the actuated relay CprB .

In the ESBO , one, two or three of the relays ArN to FrN are activated, as already mentioned (Fig. 49), or are activated via contacts 3, 1, 2 (control device "β", Fig. 44) or via contacts Cp2B, Cp ^) B and Cp $ B will be a 24V. Potential of the 48 V battery at one, two or three of the contacts 3, 1, 2 via contact combinations of the relay groups HcarB. . .HdarB. . . created.

The circuit for the relay AfrN (Fig. 49) is closed via the contacts of the relay ArNIFrN .

One of the 26 vertical magnets (Fig. 48) is operated via the contact pyramid of the relays ArNIFrN, the contact Af ^ N (Fig. 49), contact 10 and contact Cpi ο B and connected to earth (Fig. 44).

Each vertical magnet controls four outputs.

The preselector magnet VPN or VSN (Fig. 49) is via the contact Bf 3 N or Bf 4N, Ot 1 N or Ot 2 N, Tf 1 N or Tf 2 N, contact 4 or 6 (Fig. 44), contact Cp 6 S or CpJ B, Xc 2 B or Xc 4 B actuated. In this way, two outputs outside of the four controlled by the vertical magnet are selected by the contacts of the vertical selector bar VBPiN, VB2N or VSPiN, VSP 2 N.

Relay BfrN (Fig. 49) is actuated via the contacts Af 4N, vpN or vsN with the preselection magnet FFiV or VSN. Relay BfrN is bound via one contact Bf 1 N and Bf 2 N.

Relay XarB (Fig. 44) is connected to one of the contacts Ca 4 B, Cd4B or one of the contacts Cc2B, Cb2, B, Xc2B or Xc ^ B, Cp6B or CpJB, contact 4 or 6 (Fig. 44), in the ESBO (Fig. 49) Contact Tf 1 N or Tf 2N, Ot 1 N or OfzN, Bf ^ ₁ N or Bf 4N activated and connected to earth.

The tube SVB (Fig. 45) has been extinguished and relay TrB has been released . The anode circuit of the tube is open through contact Xa4 B. Relay XbrB (Fig. 45) is operated via the contacts Χατ, Β and T ι Β .

In Fig. 49, the relay TfrN or OtrN speaks via the contacts 8, Xb 6 B, one of the contacts Ca 3 B, CcT ₁ B or one of the contacts CbT ₁ B, CdT ₁ B in connection with the 24 V potential or of the 48 V battery and thus connects one of the two selected outputs with the control device »5«.

Relay XarB (Fig. 44) drops out. The circuit is interrupted by the contacts Ot 1 N or Tf 1 N or Ot 2 N or Tf 2 N.

In the first group selector the circuit to the horizontal magnet HgL (Fig. 31) via earth in the control device "B" (Fig. 40), contacts Hm 5 B, XcZ ₁ B, Cpi B, 2, in the memory (Fig. 39 or 32), wire 2, contacts Lh 2 R, contact and wire ", in the connection set wire, contact Ca 3 L, HBg 2 L and winding of the magnet HgL over the battery closed.

After actuation of the horizontal magnet HgL , relay H 1 mrB (control device "B", Fig. 40) is parallel to the magnet via contact Hg ι L, rail contact HBg ι L (Fig. 31), SaT ₁ L, Bc6L (Fig. 30), wire and contact /, contact Lh 1R ₁ Et ^ R, SxT ₁ R (memory, Fig. 32), wire 3 (Fig. 39), control device "B" (Fig. 40), contacts, Kc / \ .B, Pha ^ B, rectifier G 53 B, first winding of the relay H 1 mrB actuated, ie connected to the -48-V battery.

Relay HmrB responds via contact H imiB .

If the relay HmrB is actuated, the circuit for the magnet HgL (first group selector) and relay H 1 mrB (control device "B") is opened by the contact Hm 5 B. However, the relay H 1 mrB and magnet HgL operated in series via earth (Fig. 40), contact Bu 10 B, second winding of the relay H1 mrB, rectifier G 54B ₁ contact Pha4B, KC4B, contact 3 (Fig. 40), wire 3, contact Sx 3 R, EtT ₁ R, Lh 1 R, contact and wire / in the storage circuit (Fig. 39 or 32), contacts Bc 6 L, SaT ₁ L (Fig. 30 connection set), horizontal rail, HBg 1 L, Contact Hg 1 L, magnet HgI.

Relay XcrB (Fig. 45) is made to respond by the contacts Xb 2 B, Hm 1 B, Xa 3 B and T 1 B.

Now the follow-up test for a free exit takes place via the ESBO for the first group voter. The free potential is applied via the ESBO for the first group selector with the control device »5« via contact 6 (Fig. 44). It is transmitted via the contacts CpJ B, XC4B, HoioB, Pb2B (Fig. 44) with the follower circuit in Fig. 45. The tube SVB is ignited and relay TrB is activated again, since the anode circuit of this tube is closed again via contact Xa4B is.

The actuated relay TrB causes the relay XdrB to respond via the contacts Xb 3 B and TiB and binds itself via the contact Xd $ B.

It should be noted that the relay FtrB (Fig. 45) is a drop-out delay relay and, after opening its own circuit, remains activated until the circuit is closed by the contact Xd4B .

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In the ESBO for the first group selector (Fig. 49) the horizontal magnet HBaN or IiBbN is actuated via the contact Ot ι N or TfiN, contact 4, Cp6B, Xc2B, Xd 2 B and connected to earth. In this way, the first group selector is connected via a free output to the third group selector via contacts Ah ₁ B'L, CL, D'L, E'L (FIG. 31) by moving the horizontal rail. Relay H 1 mrB drops out by opening the circuit at the horizontal rail contact HBg 1 L (Fig. 31). The relay HmrB also drops out.

Relay OkrB (Fig. 45) is actuated via the contact Ms ι B of the relay MsrB and connected to earth (Fig. 40) via the contacts SagB, Xd ι B and Hm 5 B. The connection relay , which was activated for the first group selection , drops out when the circuit is opened by means of contact Ok 7 B. Relay RcrB (Fig. 44) drops out.

The earth is switched off by the dropout of the link relay. The tube VcB is now extinguished. The anode circuit is opened by the contact Ok 5 B. The corresponding anode relay CarBICdrB also drops out.

The HAaN or HBaN horizontal magnet is triggered, but the horizontal rail remains in its position by the first group selector - its HgL horizontal magnet.

Relay PbrB (Fig. 46) drops out through the contact OkioB . Relay PcrB also drops out , since the earth through contact Pb 5 B, as well as with the anode relay contacts and contacts of the relay HcarB. . ., HdarB. . ., which drop out with the relays MarB and MbrB , is disconnected.

The SFB tube goes out, the TrB relay drops out. the

The anode circuit of the tube is opened by contact Ok 9 B. Relay XdrB thus drops out. The earth is separated by contact TiB .

The relays CfrR and CgrR drop out in the memory. In the control device "B" (Fig. 41) the earth is separated from the wire 8 by contact Rc 1B .

In this way, the combination of the relays ZarR / ZdrR disappears from the memory for the thousand digit. These relays are made to drop out (Fig. 35). The corresponding relays ZarB / ZdrB in the control device »ß« are also brought to the rest position and cause the relay ZerB to drop out (Fig. 41).

The released relays XdrB and XcrB cause the relay OkrB to drop out. The relay MsrB drops out, since the short-circuit earth is restored via the contact OkSB.

The current in the connection relay to an ESBO for the third group selector, which is arranged in series with the relay MsrB , is now high enough to operate this relay, which prepares a connection between the control device "5" and the ESBO for the third group selector with a view to the next electoral level. The relay RdrB (Fig. 44) is actuated via the terminal N by the earth which is applied by the connection relay to indicate the third selection stage.

It should be noted that 30 terminals are shown in FIG. 47, via which 30 connection relays ERB can be actuated. This is only intended as an exemplary embodiment, fewer or more relays can be used.

Some of these connection relays ERB can be used to connect the control device "B" to the ESBO for the first group selector, others for the connection from the ESBO to the second group selector, if necessary (second group selection or special services). Others can be used to connect the ESBO to a third tier of group voting, and finally others to connect to the ESBO and reserve voters.

An example of the distribution of such connection relays ERB (1 to 30) is shown in the table of FIG.

In the memory ^ the relays DfrR and DgrR (Fig. 37) are actuated via the wire 9, contact 9 in the control device "5" (Fig. 41) and the contacts Ts 4 B and Rd 4 B.

In the memory (Fig. 35) is a combination of relays ZarR / ZdrR corresponding to the hundreds digit via corresponding contacts in each of the groups Df 3 R, Df 4 R ₁ Dg ι R ₁ Dg 3 R and Da 2 R, Db 2 R ₁ Dc 2 R, Dd 2 R according to the hundred identification stored in the relay DarR / DdrR. A corresponding combination of the relays ZarB / ZdrB (Fig. 40) is activated in the control device "5" via wires 4, 5, 6, 7, as described for the thousands identification.

The relay BmrB (Fig. 43) is operated via the contacts H4B, PasB, Vi6B, Ok6B, Rd ^ B and Pc4B . All tubes in the recorder (Fig. 43) are cleared and the corresponding anode relays are brought to waste.

The relay HaarB. . . IibarB, VirB fall off.

Relay SarB is actuated via contact Vi 3 B , while relay BmrB drops out via contact Say B. Relay ZerB (Fig. 41) is activated again in the same way as for the first digit.

A free exit for a line selector group is now searched for. In the ESBO for the third group selector (FIG. 51), a scanning device is shown in simplified form and is used to search 100 outputs for a free output. The output of this scanner is connected to the grating of the CTiQ tube. The sampling pulse which is generated at the cathode of the tube is transmitted to the contact 11 (Fig. 44, control device "β") and from there to the comparator renewer CRGB (Fig. 42) in the same way as described.

The required height increment (in relation to the hundreds digit) is selected by the correspondence network in the left part of FIG. 42 by the new combination of the contacts of the relays ZarB / ZdrB, via which the sources Rd

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corresponding to this step in height can be applied to terminal VB in a similar way to the first group selection. The free output impulses of other height steps are thus removed.
The renewed pulse produced at the output of the comparator renewer is transmitted in a manner similar to that of the scanning device (FIG. 43), the tube BAVB igniting and a combination of the tubes VaB. . ., VbB. . ., VcB. . . and corresponding anode relays Aar B. . ., BarB. . ., CarB .... and finally the relays HcarB. . ., HdarB ... can be operated in a similar way to the first group selection. Relay VorB is activated again and causes relay PbrB to respond via contacts Pa 7 B and Vo 4 B.

Relay PcrB is operated via contacts of the aforementioned combination of relays and contact Pb ζ Β .

Relay BmrB is actuated via contacts Pc 2 B and Sa2B . The tube BAVB and the tubes in the groups VaB. . ., VbB. . . delete off. Your anode relays drop out, but the tube in group VcB. . . is held as with the first group selection.

The relays MraB, MbrB are in the holding circuit of the relays HcarB. . ., HdarB operated. Relay SarB (Fig. 46) drops out and, as a result, relay BmrB.

At the moment when the relay PbrB drops out, the follow-up test for the free state of the ESBO for the third group selector takes place. This is done in the same way as with the first group selector via contact 10 (Fig. 44). A test potential of +24 V is applied in this ESBO (Fig. 52).

The tube SVB (Fig. 45) is ignited. Relay TrB responds and makes relay CprB respond again.

In the ESBO, third group selector (Fig. 52), one, two or three relays ArQ to PrQ are activated, as already described. As a result, the relay AfrQ responds and one of the 26 vertical magnets VQ _{1 to} select four outputs from 104 outputs (26 X 4) by moving the corresponding vertical rail.

Two of these four outputs are selected by actuating one of the preselection magnets VPQ or VSQ and by moving the corresponding preselection bar.

Relay BJrQ responds (Fig. 52) and causes the actuation of relay XarB (Fig. 44) and, conversely, the release of relay TrB (Fig. 45, tube SVB is also extinguished). Relay XbrB (Fig. 45) responds again and subsequently the relay TfrQ or OtrQ in the ESBO (Fig. 52). This means that only one output is connected to the control device »ß« (via Tf 2O or Ot2 Q) .. Relay XarB drops out.

As soon as the relay CprB responds, the horizontal magnet HmP (Fig. 50) pulls in the third group selector over the horizontal rail, contact HB 2 P (Fig. 50), wire c in the first group selector (Fig. 31), horizontal rail contact HBg 2 L, contact Ca 3 L (Fig. 30), earth in the control device »ß« via the memory (wire 3).

Relay H 1 mrB responds again and also the relay HmrB.

The relay EsrB (Fig. 40) is operated via the contacts Rd ι B and Hm 2 B and tied via the contact Bu 2 B and its own contact EsSB.

Relay XcrB (Fig. 45) is actuated again and a follow-up test for a free output is carried out in a known manner. The SVB tube ignites; Relay TrB responds again. The relay XdrB is activated via the contact TiB .

The horizontal magnet HBaQ or HBbQ attracts in the ESBO for the third group selector (Fig. 52) and completes the connection between the third group selector and an output free to the line selector through contacts AP, BP, CP, DP, EP (Fig. 50) Shifting the horizontal rail.

Relay H1 mrB drops. Relay OkrB picks up again.

As a result of this switching measure, the ES'-ßO connection relay for the third group selector and the relay RdrB also drop out. The tube VcB goes out and the corresponding anode relay CarBICdrB drops out.

Relay PbrP and, as a result, PcrB drop out.

The relays CprB and XprB drop out and cause the relay XcrB to drop out. Relay HcarB. . ., HdarB. . ., MarB, MbrB fall off. As a result of the dropout of the £ 5 "50 link relay, the horizontal magnet HBaQ or HBbQ drops out, but the horizontal rail is held in place by the horizontal magnet HmP (Fig. 50) of the third group selector.

Relay TrB and, depending on it, XdrB drop out.

Relay TsrB (Fig. 41) is actuated via the contacts Es γ B and Ok 2 B. The earth at the contact 9 (Fig. 41) is switched off and thereby the relays DfrR and DgrR in the memory (Fig. 37) fall. In addition, the previously activated relays ZarRIZdrR (Fig. 35) and the corresponding relays ZarBIZArB in the control device ", Β" (Fig. 40) drop out and, as a result, also the relay ZerB (Fig. 41). Earth is applied to wires 8 and 11 (Fig. 41) or via contacts Ze ^ B and Ze ^ B, Es2B and Es 1B, Ts ^ B and Ts2B.

As a result, the relays CfrR, CgrR in the memory respond via wire 8 again. The relays FfrR and FgrR are operated via wire 11.

This actuates the relay BsrR (Fig. 36) via the contacts Cf 2R and Ff 2R . Relay AxrR ■ (Fig. 39) drops out because the circuit is opened by the contact 3 R Bs. Relay BxrR (Fig. 32) drops out because the holding relay HrB in control device "B", which was linked in series with relay AxrR, dropped out .

The dropout of the holding relay causes the dropout of all actuated relays in control device "B".

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The control device:> Γ «goes to its starting position back.

The relays Df) -D, ParB, RrB, ArB and the storage connection relays de-energize first.
In the ESBO , the connection relay and the relays BurB, PharB, BrB drop out.

This is followed by the relays CfrR, CgrR, FgrR (memory), EsrB, FtrB (control device "£?"). Relay SfrB is activated again as in the normal state.

Thereupon the relays SxrR (memory), OkrB, TsrB (control device "B") drop out.

The relay B ι srR (memory, Fig. 36) is operated in parallel with the relay BsrR via the contact SxSR .

In the connection set, the relay CarL remains activated via the contact Bs 2 R (memory, Fig. 32) when the earth at the open contact Sx 2 R disappears.

After actuation of the relay EerR (memory, Fig. 35) for the complete reception and storage of the tens digit, the call potential is transferred from +24 V to the terminal Ef 2, R (Fig. 37) and to the control device "C" via the contacts B1S4R, Ee2 R, Ty SR, Ta6R, Lo2 R transferred.

The short-circuit earth of the call potential is separated by contact Ax 4 R.

The call memory can now be scanned by the control device "C" for the final dialing in the same way as the control device "23". Each control device "C" has a different scan cycle in order to prevent two control devices "C" from being occupied by the same call memory (see Fig. 69).
The sampling pulse is renewed at the cathode of the tube Vt ι C (Fig. 54).

Since the relay SfrC (Fig. 57) is usually operated via the contacts Sa 5 C, BmjC, ZeSC, Bu 5 C, Cwb ^ C and Cw a 1 C of the usually operated relay CwarC 4.0, the pulse is transmitted via the contacts Sf iC (FIG. 54) and Bm6C (FIG. 55) are transmitted to the comparator refresher CRGC shown in FIG. 55 and in detail in FIG.

Since the scanning device (Fig. 54 and 69) is controlled by F-sources (positive), the terminal zC, which leads to the cathode of the tube VT 2 in the comparator (Fig. 13), has a positive potential via the contact 7? /; 4 C connected.

The comparator renewer CRGC is controlled by the reference sources RcIx, Rex in order to identify the sampling period for the control device "C". The combinations of the sources Rdx, Rex which correspond to the sampling period are shown as an example in the table of FIG.
The renewed pulse is transmitted to the scanning device (Fig. 56) via the output terminal xC of the equalizer (Fig. 56), in which the cold cathode tube BAVC is ignited in a known manner, its anode circuit via the contacts Bm 5C, Ra4C, SaSC, winding of the relay VorC via earth closed is. One of the five cold cathode tubes VaC 1-5, which are controlled by the sources Rai- $ , one of the five cold cathode tubes VbC 1-6 , which are fed by the sources Rb i- $, and one of the four cold cathode tubes G ₅ VcC ι -4, the controlled by the sources Rc 1-4 is triggered. The anode circuits of these tubes are closed by the contact Bin 3 C.

The combination of the ignited tubes marks the calling memory.

None of the cold cathode tubes VdC 1 -11, which are controlled by the sources Rd 1 -11, are ignited because their anode circuit is opened by the contact Tee 2C.

The corresponding anode relays AarC. . ., BarC. . ., CarC. . . are actuated.

Relay VorC responds and causes the relay VohrC to be actuated via contact Vo 2 C

(Fig · SS) -, «0

Relay TfrC (Fig. 54) is activated via contacts Lf 7 C, Xc 3 C and Vo 1 C.

Relay BurC (Fig. 54) responds via contact Full ι C and is then bound via contact T / 4 C. Relay 5 "/? ' C (Fig. 57) drops because the circuit is opened by the contact Bu 5 C.

One of the relays HaarC / HaerC, HbarC / HberC is excited in series with the relay VirC via contacts of the actuated anode relays and the contact nozzle (Fig. 59). Relay AxrC (Fig. 56) is activated via the contacts of the activated anode relay. However, this has no influence on this level.

In this way, the connection relay RRC (Fig. 53), which corresponds to the calling memory whose identity has been scanned by the cold cathode tubes, via the contact pyramid of the relays H.aarC. . ., HbarC ... operated in series with the relay RarC (Fig. 60).

Relay DprC (Fig. 53) responds in the following circuit: + 24 V, LgSR, Bx \ R, wire 6 (memory, Fig. 39), contact 6, Al C, Tf 5 C, winding of the relay, earth (control device "C", Fig. 53) ·

The ringing potential is short-circuited in the memory (Fig. 39) via the wire 7, the contacts A ^ CJTfl C, Voh $ C and the resistor RioC via the -48 V battery in the control device "C" (Fig. 53).

The anode circuit is opened by contact Ra 4 C. The BAVC tube (Fig. 56) is extinguished, no VorC relay drops out and also causes the VhorC relay to drop out.

The actuation of the relay DprC causes the response of the relay HrC (Fig. 53) via the contacts Dp ι C and Tf 2 C. The relay HrC is in series with the relay AxrC in the memory (Fig. 39) via the contacts H 1 C , Tf γ C, Rg 4C, 1, wire 1, contacts Li 2 R, B 1 s 1 R and the winding of the relay AxrR blocked.

Relay BxrR is activated again in the memory (Fig. 32). In the control device "C" (Fig. 53) the relay DprC drops out, because the circuit in the wire 6 through the contact Bx 4 7? is open.

Relay ArC (Fig. 54) responds via contacts // 5 C and Dp 3 C and causes relay BrC to be actuated via contact Aj C.

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It should be noted that although the contact Vo ι C is open, the relay TfrC remains actuated due to the dropout delay until the circuit is closed again via the contact H 2 C.
Relay BmrC responds via contacts H4 C, Rb 5 C and Vi 2 C (Fig. 56). Extinguish the ignited tubes in the scanning device, the anode _{circuit is opened by contact BmT 1} C. The corresponding anode relays and the relay HaarC and relay VirC drop out. The storage connection relay is activated via contacts 12 and if3C (Fig. S3).

Relays RarC (Fig. 60) and AxrC (Fig. 56) drop out.

Relay BmrC drops out when the circuit is open through contact V12C.

Relay RbrC (Fig. 60) picks up via contacts BmSC, Ra3C and BSC.

Relay SarC is activated via contact Rb 6 C (Fig. 59).

As soon as the relay ArC is activated, they speak

Relays CfrR and CgrR in series in the memory via wire 8 in the control device "C" and the contact, Ts S C, The 7 C, A6C and Ze 9 C (Fig. 54).

In the memory, a combination of the relays ZarRIZdrR corresponding to the combination of thousands is actuated by the memory relays CarRICdrR.

At the same moment the relay SxrR (memory, Fig. 36) responds.

In the control device "C" a combination of the relays TharC / ThdrC (Fig. 53) corresponding to the thousands digit is actuated via corresponding wires 4, 5, 6, 7 and contacts A 1 C, A2C, A ^ C, A4C. One of the relays ZharC / ZherC (Fig. 59) is activated according to the thousands figure via contacts of the activated relays TharC / ThdrC .

Relay ZerC (Fig. 54) talks about contact The SC and a combination of relay contacts ThaC. . . on.

In the memory, the relays CfrR, CgrR drop out, since the earth in the control device through the contact Zi? 9 C is separated.

The ZarRIZdrR relays drop out in the memory, but the TharC / ThdrC relays in the control device »C« remain connected to earth via their own contacts in series with the TherR relay and the BiC contact. The earth, which had short-circuited the TherC relay, is switched off.

Relay ZerC drops out because the circuit is open through contact The 8 C.

In the memory, the relays DfrR and DgrR respond in the following way: wire 9, control device "C", contact Ts 3 C, Hue 7 C, The 1 C, A 6 C, Ze 9 C (Fig. 54) ·

A new combination of the relays ZarRIZdrR is activated in the memory according to the hundreds digit stored by the memory relays DarRIDdrR.

In the control device "C" (Fig. 53) a combination of the relays HuarC / HudrC speaks according to the hundreds digit, via corresponding wires 4, 5, 6 and 7, corresponding contacts A 1 C, AzC, A3C, A4C, The ζ C ₁ The ^ C ₁ The ^ C and The 6 C an. Via this contact pyramid ZharCl ZherC and relay HuarC / HudrC (Fig. 59) a connection relay in the ESBO for the .. line selector responds according to the thousands and hundreds digit. In this way, the ESBO is selected with the final selector that corresponds to the final selector group that is switched through to the first group selector via the last group selector using the same thousands and hundreds digits.

Relay ZerC addresses via the contact Hue 8 C and the combination of the relay contacts HuaC ... In memory, the relay DfrR and DgrR fall off because the earth is separated in the control device "C" (Fig. 54) by the contact Ze 9 C.

The relay combination ZarRI ZdrR drops out in the memory and thus prevents the short circuit of the relay IiuerC (Fig. 53), which responds in the holding circuit of the relays HuarC / HudrC via the contact The 2C.

Relay ZerC drops out because contact Hue 8 C opens this circuit.

In the memory, the relays EfrR and EgrR respond in series via the wire 10 of the control device "C" (Fig. 54) and the contacts 10, Ts ^ CTeejC, Hue 1C ₁ TheiC, A6C and ZegC . ,

A new combination of the relays ZarRIZdrR is activated in the memory according to the tens digit. A corresponding combination of the relay TearCITedrC speaks in the control device. connection "C" (Fig. 53) via wires 4, 5, 6, 7, contacts A ι C, A2C, AzC A4C, The3 C, The ^ C, The $ C ₁ The6C, Hue 3 C, Hue 4C ₁ Hue ^ C, Hue 6C an.

Relay ZerC (Fig. 54) responds via contact Tee 8 C and contacts of relay TearC ... again.

In the memory, the relays EfrR and EgrR drop out, since the earth is disconnected in the control device "C" by the contact Ze 9 C. "

The combination of the relays ZarR ... drops out in the memory and thus prevents the short-circuit earth at the relay TeerC, which responds in the holding circuit of the relay TearC ... via the contact Hue 2 C. .

Relay ZerC drops out, since contact Tee 8 C breaks the circuit.

In the memory, the relays FfrR and FgrR respond in series via the wire 11, control device "C" (Fig. 54) and the contacts 11, Ts6C and Tee ι C.

A new combination of the relays is created in the memory according to the representation of ones. and thus a corresponding combination of the relays UnarC / UndrC, the control device "C" (Fig. 53) made to respond.

For units ο to 4, the relay ZerC is activated directly via the contact Ts 7 C and the contact combination of the unit relay UnarC. . . actuated.

Relay CorC (Fig. 56) is loaded for units 5 to 9 via the corresponding contacts of the unit relays.

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activates and causes relay CohrC (Fig. 56) to respond. In the example the relay ZerC speaks via the contact Coh 1 C or Coh 2 C and contacts of the unity relay UnarC. . . on.
Relay ZerC is activated via its own contact Zi? ι C held.

The sampling process for the tens and ones now begins.

This is done via the ESBO for the encl voter. In this ESBO (FIG. 5) a scanning device is controlled by the sources Na, Nb, Nc (negative) and connected to the grid of the tube CT 2 1.

This scanner is also controlled at terminals A and B by the sources Pdi-ii in order to identify the class of the line. Each class of conduction is characterized by two sources Pd, as can be seen from the table in FIG. 72. The scanning pulse generated at the output of the scanning device is renewed at the cathode of the tube CT 21 and transmitted to the comparator renewer CRGC via the connection relay and the contacts 9 (Fig. 57), B4C, Sf 3 C (Fig. 54) and Bm6C (see Fig. Figs. 55 and -13).

Since the output characteristic pulses are negative in the ESBO for Endwähler (Fig. .5), the Klemme2C comparison renovator CRGC is now connected to a negative potential through the contact Rb 4 C.

This comparator refresher is controlled by the reference sources Ra, Rb, Rc in the correspondence network (in the left part of Figures 55 and 56), the output of which is connected to the terminal vC.

The task of the correspondence network is to emit an impulse when the three sources Ra, Rb, Rc correspond, which correspond to the tens and units digits (00 to 99).

As can be seen from the table in Fig. 73, the distribution is on a hundreds network as follows:

Source Rc 1 corresponds to outputs 00
up to 24,

Source Rc 2 corresponds to outputs 25

up to 49,
Source Rc 3 corresponds to outputs 50

up to 74,
Source Rc ^ corresponds to outputs 75

until 100,
Source Rb 1 corresponds to outputs 00

to 04, 25 to 29, 50 to 54, 75 to 79,
Source Rb 2 corresponds to outputs 05
to 09, 30 to 34, 55 to 59, 80 to 84,

Source Rb 3 corresponds to outputs 10

up to 14, 35 to 39, 60 to 64, 85 to 89,
Source Rb 4 corresponds to outputs 15

to 19, 40 to 44, 65 to 69, 90 to 94,
60.Source Rb 5 corresponds to outputs 20

to 24, 45 to 49, 70 to 74, 95 to 99,
Source Ra 1 corresponds to the ones ο and 5,
Source Ra 2 corresponds to the ones 1 and 6,

Source Ra 3 corresponds to units 2 and 7,
Source Ra4 corresponds to units 3 and 8, source Ra 5 corresponds to units 4 and 9.

In order to obtain the image of two digits from 00 to 99 corresponding to the 100 outputs, a cycle of the sources Ra 1-5 is required, and a new i? £> source for every five digits is necessary, with the sources Rb 1-5 are subdivided and another source Rc makes 25 distinctions each.

A source Ra is applied to the contact combination UnaCIUndC (Fig. 55) and the contacts Ze 5 C, Sb 4 C and Sa 3 C. Each terminal for the source corresponds to two units (ζ. B. ο and 5).

A source Rb is applied to the combination of contacts Co 1 C-Co 5 C, TeaCITedC (Fig. 55) and contacts Sb 8 C and Sa4 C.

The combination of relay contacts TearC. . . Identifies the tens digit, whereby the contacts Co ι C to Co 5 C differentiate between the ones ο to 4 and 5 to 9 in the group of ten, since the source Rb changes with every five numbers.

A source Rc is either via the contact combination of the relays TearRITedrR (Fig. 56) and the contacts Sb 3 C (Fig. 55) and Sa6C (for the tens digit or 2 or 7) or via one of the contacts Coh 3 C, Coh4C, contacts the relay TearR. . . (Fig. 56) and the contacts Sb 3 C (Fig. 55) and Sa6C (for the tens digit 2 or 7, since the source Rc changes after the numbers 25 and 75, ie also for units 5 to 9 in the group of tens) .

The renewed pulse is applied via the output terminal xC to the scanning device (Fig. 56) where it ignites one of the tubes VaC 1-5, VbCi-S 'VcC 1-4 and one or two of the tubes VdC 1-11 to activate the Identify the output identity and the line class of the output.

It should be noted that the tubes VdC 1-11 can now ignite because their anode circuit is closed via the contacts Ze 2 C and Tee 2 C.

The corresponding anode relays respond. The relay AxrC (Fig. 56) is activated again via its contacts.

If the output is free, sources Pd 1 -5 and 7-11 are connected to terminals A, B in the ESBO for the final selector (Fig. 5), so that two tubes from tubes VdC 1-11 are ignited. will. If the output is occupied, one source Pd 6 is replaced by the other Pd-Qiiel \ e , so that only one tube VdC 7 ignites.

Several cases can arise: Either the exit is free or occupied and corresponds to one single line, or the output is busy and belongs to an interspersed extension group, or the exit is busy and corresponds to a small extension group, or the exit corresponds to a disconnected line, a switching line or a special line.

In the case of a free line, as can be seen from the table in Fig. 72, either a source 17.5 Pd 7 with one of the sources Pd 1, Pd 2, Pd 3, Pd 4,

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, Pd io, Pd Ii associated or a source Pd 8 associated with one of the sources Pd ι, Pd2, Pd? ,, Pd ^, PdS, Pd io, Pd 11 associated.

As a result, the relay FrrC (Fig. 58) responds via the corresponding anode relay of the ignited 'tubes VdC 1-11. Now the test process can take place on the free status of the final voter of the ESBO .

If the ESBO is free, a 24 V potential (Fig. 7) is applied via the contacts Cf 2 1, Tf 3I, 0 * 31, MCI, ^ 4 / 3I to the contact 10 in the control device "C" (Fig . 57) created.

From there it is about the contacts Cp 9 C, Ax, C and Fr 4C for Folgeprüfstromkreis STC. 15 shown in Figs. 58 and 19 are transmitted.

This follow-up test circuit is carried out by the

Sources Rax, Rbx controlled to identify the test time at the control device "C". The distribution of the sources of supply for each controller "C" is shown as an example in FIG.

The mode of operation of the follow-up test circuit

has already been used in conjunction with the. Fig. 19 explains.

"If the ESBO is free for the final selector, the SVC tube ignites. Its anode circuit is closed by contact Fr 3 C (Fig. 58).

Relay TrC responds in the cathode circuit. Relay CprC (Fig. 57) responds via the contacts Tf6C, TiC and BsgC . It completes the connection between the control ^{device 1} »C« and the ESBO for the end: - selector.

In the ESBO for the final selector (Fig. 7) one, two or three of the relays Ar I to FrI are operated. The actuation of only one or none of the relays in each pair Ar I and BrI, CrI and DrI, ErI and FrI depends on the contact combination of the actuated anode relays, which via contacts 3, 1, 2, Cρ2.C, CpJ ₁ C and Cp 5 C connect a 24 V potential or 48 V battery to at least one of the three pairs of relays.

In this way 3 ³ - 1 = 26 combinations can be obtained, each corresponding to one of the 26 vertical magnets. The 27th combination (no relay or all activated) indicates the normal idle state.

The relay Afr I responds in the ESBO for the final selector and one of the 26 vertical magnets VI (Fig. 6) is via the contact pyramid of the relays ArIIFrI, AfJ ₁ I, contact 10 (Fig. 57) in the control device "C" and contact Cp9C, actuated. In this way, four outputs are selected by sliding the corresponding vertical rail.

In the ESBO for the final selector (FIG. 7), the preselection magnet VPl or VSl is, as already described for the other ESBO , via contacts 4 or 6 (FIG. 57), Cp6C or Cp 7 C, Xc 4 C or Xc 8 C and one of the anode contacts C & 2C, Cc2 C or Ca 1 C / Cd 1 C, Xa2C, Xb ^ C and Cp8C operated. In this way, two of the four selected outputs are selected by moving the corresponding vertical selector bar.

Relay Bfr I speaks in parallel with the magnetic code VP I or VSI through the contacts and Af4.I vpl or vsl (Fig. 7). Relay BfrI and the preselection magnet VPI or VSl are bound by the earth, which is applied by means of contacts Bf 11 and Bf 2 1.

Relay XarC (Fig. 57) speaks either via the contacts Xb6C ₁ CaC or Cb 1 C, XcS C, Cp 7 C, contact 6 in the control device A, ESBO for the final selector (Fig. 7), Tf 2 1, Ot 21 and Bf 41 to earth or via the contacts Ca 2 C or Cd 2 C, Xc OfC, Cp6C, contact 4 in the control device "C", ESBO for the final selector, Tf il, Ot il and BfJ ₁ I. Relay XarC is held via its own contact Xa 1 C. In the event that it has been actuated via contact Xb 6 C, this relay does not drop out when this contact opens.

Relay XbrC (Fig. 57) responds via the contact Xa 3 C and binds itself via the contacts Xb ι C and Bu 3 C.

In the ESBO. for the final selector (Fig. 7) the relay Tfrl or Oirl responds via the contact 8 in the control device C (Fig. 57) and the contacts Xb 4 C, Ca 3 C or Cc 3 C to +24 V battery ( for the relay Tfr I). The relay Oirl is connected to the - 48 V battery via contact CbJ ₁ C or Cd3 C. In this way, only one output of two via the contacts Tf 2 1 or Ot 21 is identified. - Relay XarC drops out.

When the relay CprC is actuated, the horizontal magnet HmS in the final selector (Fig. 61) pulls over wire c, wire c in the third group selector (Fig. 50), wire c in the first group selector (Fig. 31), wire g- in the connection set (Fig. 30), wire 2 in the memory (Fig. 32 and 39), contact 2 in the control device "C" (Fig. 53), contacts Cp 4 C, _{HmJ 1} C and Xc γ C on. In the manner already described, the relay H 1 tnrC (Fig. 53) speaks in parallel with the horizontal magnet via the contacts Cp 1 C, A ^ C, Kc 2 C, contact 3, wire 3 in the memory, wire / in the connection set (Fig. 30 ), Wire d in the final selector (Fig. 61), HB 1 S, HiS (horizontal magnet).

Relay HmrC responds via contact H iwiC.

Relay H 1 mrC remains held in series with the horizontal magnet in the manner already described.

Relay XcrC (Fig. 57) speaks to contacts XbJ ₁ C, Hm ι C and Xa 3 C and connects to its own contact Xc 1 C.

A follow-up inspection process now takes place in order, in turn, to confirm the free status of the exit of the final voter to consider.

If the output is free, a -48 V potential is generated connected to wire c of the subscriber connection via a resistance of 60 kOhm.

This free potential is via the contact 0i2l or Tf2! (Fig. 7) Jn the ESBO for the final selector to contact 6 (Fig. 57) in the control device C transmitted. From there it gets over

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the contacts Cp, JC, XcSC are transferred to the grid of the tube TtC (Fig. 58) of the double triode composed of the tubes TtC and RtC . Usually the grid of the tube TtC is biased with -99 V by the potentiometer R 163 C -R 164 C, whereby the grid of the tube RtC is at -92 V via the potentiometer R 167 C- R 173 C and contact Cwb 2 C. The double triode is cathode-coupled and connected in a cathode follower circuit. ■ 10 The RtC tube is usually conductive and the anode relay CwarC activated. The TtC tube is switched off because the cathode potential is at -84 V.

If the free potential of -48 V over 60 kOhm is placed in parallel with the resistor R 164 C, the grid of the tube TtC is raised to over 75 V, so that the tube becomes conductive. The cathode potential is raised to such a level that the tube RtC is switched off and relay CwarC drops. Relay CwbrC (Fig. 57) speaks to contacts Xc 5 C, Bs τι C and Czva ι C. Relay CwbrC is dimensioned so that contact Cwb ι C is closed long before contact Cwb 3 C. Relay CwbrC is held via contact Xb 2 C. Through contact Cw ?; 2 C the potential of the grid of the tube RtC is raised to -58 V, so that the tube becomes conductive again and the relay CwarC responds again.

The actuating circuit of relay CwbrC is opened again before relay CwcrC responds via contact Cwb 3 C. Relay LfrC (Fig. 57) speaks to contacts Cwc 4 C, Czvb $ C and Czua ι C.

In the event that the subscriber line is assigned a line and isolating relay, earth is placed on the grid of the tube TtC when the line is free.

In this case, relay CzvarC cannot fall before relays CwbrC are activated,

CwcrC and CwdrC when the grid of the RtC tube is brought to +24 V via contacts Cwd 2 C, Cwc 2 C and Cwb 2 C. In this case the relay LfrC speaks through contacts Cwd 5 C,

■ Cwc 5 C, Cwb 5 C and CwaiC . In both cases the relay LfrC binds itself via its own contact Lf ι C and contact Fr 2 C.

In the ESBO for the final selector (FIG. 7) the horizontal magnet LIBa I or HBb I attracts via contact 4 (control device "C", FIG. 57) and contacts Cp 6 C, Xc 4 C and Lf 2 C.

In the final selector (Fig. 61) the horizontal rail is moved in the corresponding direction, and the final selector is connected to the subscriber line via the contacts AS, BS, CS, DS, ES .

The free condition of the exit is replaced by the busy condition. Therefore, the grid potential of the tube TtC (Fig. 58) is brought to -48V. The tube becomes conductive again and the tube RtC is switched off, so that the anode relay CwarC drops out.

Relay CwcrC responds and causes the actuation of the relay BsrC (Fig. 58) via the contacts Sc 3 C, Cwc 5 C and Czva ι C (Fig. 57) as soon as the relay CwarC through contact Cwc 2 C in the grid circuit of the tube RtC has addressed.

As soon as the horizontal rail has made contact, the circuit for the relay H 1 mrC on the horizontal rail contact LIB 1, S is opened. The relay drops out, as does the IimrC relay. Relay TsrC (Fig. 53) is activated via contacts LIm 4 C and Xc 2 C and is linked via its own contact Ts 1 C and contact B 2 C.

In the memory, the relays PfrR and FgrR drop out because the earth is switched off from wire: 1. The combination of the actuated relays ZarR / ZdrR drops out in the memory, as does the corresponding combination of the unity relays UnaRI AndR of the control device "C". Relay ZerC drops out. Relay KcrC (Fig. 53) pulls across contacts? ^ 2 C, Z <? 4 C, Cn 3 C, As 6 C an.

In the memory, the relays DfrR and DgrR respond via the wire 9, in the control device "C" (Fig. 54), contact 9 and the contacts Ti 3 C, key C and Rg 1 C , the relays LfrR 'and FgrR via the wires and contacts Ts 6 C, Kc 6 C and Rg ^ C also respond.

In the memory, the relay EsrR speaks via the contacts Df 2 R and Ff 5, R. (Fig. 36).

In the first group selector circuit (Fig. 31) relay SarL pulls in series with relay IwrC (control device "C", Fig. 53) in the following circuit: Earth, relay IivrC, contacts Oo ι C and Kc 4 C, contacts in the control device " C «(Fig. 53), memory (Fig. 39) wire 5, contacts Es ^ R, Et 4 R, Lg6R (Fig. 32), contact and wire j, wire 7 in the group selector, rectifier parallel connection of relay SbrL, relay SarL , Battery.

In the control device C (Fig. 53) the relay ItrC responds via the contacts Izv .1 C and Iv 1 C and binds itself via the contact Kc 1C. At the same time relay IwrC drops due to a short circuit to earth, which is given in the first group selector via the contacts Rt τ L, Sa ι L, Ea 5 L and Cay L.

In the connection set (Fig. 30) the relay SrrL responds in series with the relay IvrC in the control device "C" (Fig. 53) in the following circuit: earth, relay IvrC; Contacts Lf 5 C, ItT, C, Oo 2 C, Kc 3 C, contact 4 in the control device "C", further memory wire 4, contact Es 3 R (Fig. 39), contact Lg 10 R, contact and wire e (Fig. 32), connection circuit (Fig. 30), veins, contacts Bc 5 L and Say L, relay Srr L, battery.

In the control device "C" the relay ImrC (Fig. 53) responds via contact Iv ι C and connects via the contacts Im 1 C and Kc 5 C.

At the same time relay IvrC drops out due to a short circuit by means of earth in the connection set (Fig. 30) via the contacts Rc 1 L and Sr 2 L.

In the control device "C" (Fig. 53) relay OorC is actuated via the contacts Im 2 C, Lf \ C, Bs6C, It 2 C, Ιζυ ι C and Iv ι C.

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Relay SbrL in the first group selector (Fig. 31) speaks about the primary winding from earth via contact Rt 1 L, relay SbrL, wire j in the connection set, wire; in the memory, wire 5, contacts Kc \ C, OoiC, Bs ^ C, L / 6C, resistor R 9 C in the control device "C" (Fig. 53), battery on. It binds itself via the second winding and the contacts Sb ι L, Sa ι L and Rt 1 L.

From the moment the relay SbrL is picked up , ringing current is sent to the called line via contact Ea 4 L, the winding of relay RcrL, contacts Sr 3L and Sb4L, wire b, wire a, contacts SbJ ₁ L, Sr ι L and earth laid out. At the same time, the ringing current is connected to the calling line via the contacts Ea 3 L, Sr4L, secondary winding of the relays DsrL and CsrL, via earth.

If relay SbrL is activated, the relay RgrC speaks in the control device "C" (Fig. 53) via the contacts Lf 3 C, Bs2C, Kc2C, contacts, memory (Fig. 32), contacts Sx 3 R, EtJ ₁ R, Lh ι R, contact and wire / in the connection set (Fig. 30), contacts Bc 6L, 5a 3 L and Sb γ L above ground. The relay is maintained via contacts Rg 2 C and Bu 2 C.

In the control device "C" (Fig. 53) the contact Rg4-C opens the actuating circuit of the relays AxrR in the memory and HrC in the control device "C" in series; Both relays drop out, and this successively restores the initial stage in control device "C". In the memory, the relays DfrR, DgrR, FfrR, FgrR drop out, since the earth of the wires 9 and 11 is switched off by the contacts Rg 1 C and Rg 3 C.

In the memory, the relay BxrR (Fig. 32) drops out and subsequently also the relay SxrR. Relay RgrR (memory, Fig. 32) responds via the contacts Es 6 R and Sx 7 R and restores the original state of the memory.

In the control device »C«, the release of the relay HrC causes the relays TfrC, ArC and the storage connection relay to drop.

Relays CprC and BurC also drop out. Relay SfrC is activated again and relay XbrC is brought to release.

The actuated relays CwbrCICwdrC drop out and one after the other also the relays XcrC, TsrC, KcrC, ImrC and IbrC.

When the relay ArC drops out, the relay BrC also drops out and the relay BmrC is actuated. The cold cathode tube !! of groups F0C1-5, VbC 1-5, VcC 1-4 in the scanning device go out. The corresponding anode relays and the AxrC relay drop out.

The relays BmrC, RbrC, TharC / TherC, HuarC / HuerC, TearC / TeerC drop out and cause the connection relay in the ESBO to drop out, the tubes in groups VdCi-11 to drop out, the corresponding anode relays dropping out and the dropping out the relay ZharCIZherC. Relay FrrC drops out, followed by relays LfrC and TrC, whereby the SVC tube goes out. Relays OorC and IvrC drop out.

In the memory the relay LfrR drops out, furthermore the relays LirR, LgrR, LbrR, LhrR (Fig. 32). The drop in the relay LhrR causes the relays EsrR (Fig. 36), TyrR, PirR- (Fig. 33) EarL (Fig. 31) and the horizontal magnet HmR (Fig. 32, memory) to drop. The memory is disconnected from the connection set. The relay RfrR is operated via the contacts Co 10 R, Lb 4R, EsSR, TyJ ₁ R, Hb 1 R (Fig. 32), with a free potential of +24 V to the conductor Ef 1 A of the control device "A" the contact Rf 1R is applied. The relay BsrR drops out and subsequently the relay B 1 srR (Fig. 36).

The fall or the tripping of the memory results in the disconnection of the earth potential in the connection set on wire i , which causes the relay EarL to respond via the contacts Ca 2 L, Ds 2 L, Mc 4 L and 50.4L.

As soon as the relay EarL is actuated, the immediate ringing current on the line is replaced by an interrupted ringing current and ringing tone by means of the contacts Ea 3 L and Ea ^ L.

If the called subscriber picks up his flörer, the relay RcrL (Fig. 31) responds and opens the holding circuit of the relay SrrL (Fig. 30) by switching off the earth at contact Rc 1L. The drop of the relay SrrL switches off the ringing current and connects the monitoring relays CsrL, DsrL (Fig. 31) with the called line. These relays are activated via the subscriber loop. The response of the relay DsrL causes the opening of the circuit for the relays CarL and EarL. The latter is delayed so that a pulse is transmitted via the counting wire DL in order to influence the counting register of the calling line. This pulse is given by means of a +24 V potential via the contacts Ca 8 L, SaSL, Sb 5 L and Ea 1L . If the conversation is ended and both participants have hung up their handset, the relays AsrL, CsrL, DsrL (Fig. 31) drop out.

The relay SarL is brought to drop by the contact As 1 L. The relay SbrL also drops out through contact Sa 1 L.

The relay SarL opens the a-, b-, c-wires of the second caller switch on the contacts Sa6L, 5Vz. 5 L, Sag L and at contact 5a2 L the holding circuit for the magnet HiL, which in turn opens the holding circuit of the first call seeker circuit with contact H1 3 L. The horizontal rail held by the HiL magnet goes into the rest position. The contacts of the switch are opened, and the contacts of the horizontal rail HB11L, HB 12 L also return to the rest position.

The subscriber line is free and can speak outgoing or incoming connections accept.

The relay SbrL (Fig. 31) separates the conductors a, b and c of the first group selector with the contacts Sb 3 L, Sb4L, Sb6L . Likewise, the holding circuit of the magnet HgL is separated by the contact Sb 2 L , which in turn is through

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Contact Hg 3 L disconnects the holding circuit for the next group selector. The horizontal rail, which was held by the magnet HgL, returns to the rest position, whereby the contacts are opened. The contacts HBg 1 L, HBg 2 L return to the rest position. The relay BcrL (Fig. 31) is actuated via contacts Ht2L and Hg2L , whereby the connection set is again ready for another call.

In the case of a busy line, the source Pd 6 is applied to the terminal / 4 (Fig. 5) of the ESBO for the final selector, whereas the source Pd 7 or Pd 8 is applied to the terminal B. In this case, if the busy output is through the cold cathode tube !!

the control device "C" (Fig. 56) has been registered, relay BsrC (Fig. 58) can respond via the anode relay contact Dg 1 C and the two first mentioned anode relay contacts, which correspond to the Pd sources 7 and 8, The last anode relay contact corresponds to the Pd source 6.

Relay TsrC (Fig. 53) responds via the contacts Hm 4 C and Bs 8 C.

As a result, the relays FfrR and FgrR in the memory are brought to waste, since the earth on wire 11 is separated by contact Ts 6 C. The ZarRIZdrR relays drop out in the memory and cause the corresponding UnarCIUndrC unit relays in the control device "C" to drop out (Fig. 43). Relay ZerC drops out and relay KcrC (Fig. 53) is actuated via contact Ts 2 C. The relays DfrR, DgrR, FfrR, FgrR (memory, Fig. 37) are activated again via the wires 9 and 11, which is connected to earth via the contacts Tj 3 C and key C or Ts6 C and Kc 6 C. The relay EsrR (Fig. 36) responds in the memory. Relays S arL in the connection set (Fig. 31) and IwrC in the control device "C" (Fig. 53) respond in series. Relay ItrC (Fig. 53) is actuated, while relay IwrC drops out, as has already been described for a free line. Relay RgrC is activated in the control device »C« and determines the return of the control device »C« and the memory to the rest position.

In the connection set, which is held via the relay AsrL (Fig. 31) or contact As 1 L , the busy signal is applied via the contacts Ea 2.L, SbSL, Sr4L and the secondary windings of the relays DsrL and CsrL .

If a group of extensions is busy, the source T ^ cio is applied to terminal A of the scanning device in the ESBO for the final selector (Fig. 5) and one of the sources Pd 1-5 is applied to terminal B.

If the class of the output in the tubes VdC ... is stored in the memory device (Fig. 56) of the control device "C" , relay PhrC (Fig. 58) speaks via the contacts Ax 5 C, Sb g C, one of the anode contacts Db 3 C

So to Df 2 C (corresponding to sources Pd 1-5), contact As 5 C and relay contact Dg 1 C via the corresponding source Pd 6. A +24 V potential is applied to the contact Rb4C (FIG. 55) via the winding of the relay HprC and the contacts Hp 1 C and Ph 2 C (Fig. 56) in order to block the comparator renewer CRGC. This is necessary to prevent the search for a free exit in the extension group, except for the time unit that corresponds to the main connection of the extension group.

Relay SbrC (Fig. 59) responds via contact Ph 3 C and binds itself via contacts Sb 7 C and Sa ι C. Relay ScrC (Fig. 57) is actuated via contacts Sb 2 C and Lf 2 C. The supply sources Rd 1-5, which correspond to the extension lines, are now applied to the terminal vC of the comparator renewer via corresponding anode relay contacts Db 2 C to Df 2 C and contacts Sb 3 C, Sb 4 C, SbSC and Sa4C .

The sources Rb (FIG. 55), which were originally connected to the comparator renewer CRGC , are now connected to the control electrode of the cold cathode tube VshC (FIG. 56) via the contact Sc 2 C (FIG. 56). The tube is also controlled by sources Ra (Fig. 55) via contact Ze 5 C, by source Rc via contact Bm4 C (Fig. 56) and by sources Rd 1-5 via one of the anode relay contacts Db 4CIDf 4 C.

When relay PhrC is activated, relay BnirC also responds. The tubes in groups VaC ..., VbC. . ., VdC. . . extinguish and the corresponding anode relays de-energize.

The relay AxrC and relay BmrC are also brought to waste.

If there is a match between the sources Ra, Rb, Rc, Rd , which corresponds to the main line of the extension group, but whose number was dialed busy, the tube VshC (Fig. 56) is ignited. The anode circuit is closed via the contact Ph 4 C, winding of the relay HprC to +24 V and the relay is made to respond. The relay PhrC (Fig. 58), which was held via the contacts Ph 1 C, HP4C and B6C , is now released by the contact Hp 4 C.

The comparator renewer (Fig. 55) is now unlocked by the open contact Ph 2 C , so that the search process can be carried out after a free exit in the extension group by scanning the next line after the main line.

In the registration device, if a free exit has been found in the extension group, the tube BAVC (Fig. 56), one of each tube group VaC 1-5, VbCi-S, VcC ϊ- $, one of the tubes Vd 1-5 and a second tube Vd 7 ignited. The corresponding anode relays are activated. Relay VorC responds to prevent the following cycle. Relay VhorC is also activated. Relays AxrC and FrC are also used in the same way. The switching action is then carried out as for a free line.

If no free output is found in the extension group, none of the tubes in the cycle can ignite and the VorC relay is also not activated

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will. Therefore, at the beginning of the following cycle, the tube VshC is re-ignited. The anode circuit is this time closed via the contacts Ph 4 C, Vo 3 C, Sb ι C, H ^ pC and relay ShrC, which responds.

Relay BsrC (Fig. 58) is actuated via the contacts Sh ι C and Vo 4 C. It shows the busy status. The switching action is carried out in the same way as for a single busy line.

ιό In the case of a small extension group, the busy current source Pd 6 is applied to the terminal in the ESBO's scanning device for the final selector and the source Pd 11 to terminal B. In such a case, the storage device must indicate that the next group line is selected .

In the control device "C" (Fig. 58) the relay N tr C speaks via the contacts Bs 12 C, Fr 5 C, anode relay contact Da 2 C, which corresponds to the source Pd 11, contact ^ 4.? 5 C and contact Dg ι C (which corresponds to the source Pd 6 for the busy display) and is maintained via contacts N14 C and Ax 2 C.
. In the memory, the relays EfrR and EgrR are actuated via the wire 10 and a ground is applied to the contact Nt 1 C (Fig. 54). Earth is applied to the counting relays Iar to IcrR, JarR to JfrR (Fig. 33) via contacts FfSR, Ef8R, \ - Bis2, R, Ei ^ R. In the memory, the relay LmrR (Fig. 33) responds via the contacts C04.R and E13R and the same earth. The relay combination ZarR / ZdrR, which corresponds to the one digit, drops out when contact Lm 3 R is open in the memory and also causes the corresponding relay UnarCIUndrC in the control device "C" to drop. Relay ZerC (Fig. 54) drops out. This opens the anode circuits of the tubes VdC 1-11 through contact Ze 2 C , since relay N irC is actuated and contact N 13 C is open. The ignited tubes VdC. . . go out. The corresponding anode relays drop out.

Relay BmrC (Fig. 56) is activated via contacts H4C, Ze το C and Nt2 C.

This will extinguish the tubes in groups VaC. . ., VbC. . ., VcC. . ., which were ignited in the registration device. Relay AxrC and relay NtrC drop out. The holding circuit is opened by contact Ax 2 C. Relay BmrC drops out again. In the memory, the relays EfrR and EgrR drop out, since the earth at the contact Nt ι C is switched off. The earth is also switched off at the counting relay.

The counting relays have received earth for only a short period of time, i. H. get an impulse, whichever advances this relay to a new combination which corresponds to the following ones digit.

Relay LmrR drops out, and contact Lm 3 R is closed again. A new combination of relays ZarR / ZdrR, which corresponds to the following unit, is now activated. A corresponding relay combination UnarCIUndrC in the memory is activated. Relay 'ZerC is in turn actuated via these relay contacts or via contacts of relays Coh 1 R or Coh 2 R for units 5 to 9. The dialing then takes place in the same way as with a free line of the previous number.

In the case of dead lines, a message can be given if

a) the source Pd 6 is connected to the terminal in the .EvSTJO scanner and the source Pd 10 is connected to the terminal B ;

b) for non-existing hundreds; in this case relay DtrC is actuated via the nonexistent hundred combination , terminal 49 or 50 (Fig. 59) and terminal 70 (Fig. 57);

c) when the calling party's plug is unplugged; in this case the relay DtrC can respond via the contacts Xc 6 C and CwaiC before the relay CwarC drops out (this is not necessary for a free line, since the relay CwarC drops out very quickly in this case).

In all three cases of dead lines, the relays AsrC and CnrC (Fig. 58) are activated. Relay TsrC is in turn actuated in parallel via the contacts As 1 C, Cn ι C. The earth on wire 11 to the memory is switched off. The relays FfrR and FgrR drop out. The relays ZarR / ZdrR drop out in the memory and the unity relays UnarCI UndrC in the control device »C« also drop out. Relay ZerC in turn drops out, relay KcrC is actuated. In the memory, the relays CfrC and CgrR, DfrR and DgrR, EfrR and EgrR speak to via wires 8, 9 and 10 and common ground via contact Ze 3 C or contacts Cn 2 C, As 3 C and As 2 C in parallel Cn 4 C:

In the memory, the relays AsrR and CnrR (Fig. 36) respond via the contacts Df 5 R and .E / 5 R or Cf 5 R and Ef 2 R and maintain themselves via the contact Lh 9 R. Relay SrR (Fig. 34) responds via the contacts As 2 R and Cn 2 R in parallel. The relay B 1 sR drops in the memory (Fig. 36) and also causes the drop in the relay AxrR (Fig. 39) through the open contact B 1 s ι R. i ° 5 In this way, the relay HrC, which is connected in series, in the control device "C", which returns to the rest position. Circuits are prepared in the memory for the assignment of a control device »B« for a special connection for dead line calls.

The same switching action takes place if the relay CnrC is actuated alone. The corresponding PD sources 10 and ii are used for this purpose. In this case, only the relays CnrR, CfrR, CgrR, EfrR, EgrR, CnrR are activated in the memory.

The same process also applies if relay AsrC is actuated only in control device »C« (absence condition). This corresponds to the Pd sources 7 and 9 or 8 and 9 .120 or 11 and 9. In this case, only the relays AsrR, DfrR, DgrR, EfrR, EgrR are activated in the memory.

The embodiment in which, three different types of control devices for call searcher stages, Group election levels and final selection

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stage are only to be regarded as a pure example.

Other designs can be used, e.g. B. only one type of control device. So can . 5 z. B. the control device "B" can be replaced by "C". The same control device is used for group and final selection or where one type of control device replaces the "A" and "C" control devices, the same control device can be used for call seekers and final selection levels. The same control device can also be used for call searcher selection level, group selection and final selection.

Another advantage of the invention is host harm in relation to switching elements. So z. B. 100 memories for 50 £ 5 \ BO circuits be provided.

If each of the 100 storage tanks are to be connected to the 50 ESBOs via relays, then 50 X 100 = 5000 relays are required. If, according to the invention, 10 intermediate conveyors are provided, 100 X 10 = tooo relays for connections between the memories and control devices are required for 100 memories and 50 £ 50 O circuits, with 10 X 50 = 500 relays for connections between the control devices and each the BSBO''s is necessary. A total of only 1500 relays is then necessary.

It has been found that the control circuits are also used to control the connection means more economical and simplified, z. B. without registration switching means. These registration switching means remain within the storage circuits, as is already known is.

Claims (2)

PATENT CLAIMS: i. Circuit arrangement for central control devices, which are each assigned to the connecting elements of one or more dialing levels in telecommunications, in particular telephone systems, characterized in that a first control device ("A") is provided which, by a calling subscriber, occupies the selection of free dialing levels (1st and 2nd AS) and the selection of a free register (R) controls, and that a second and third control device ("B" and "C") are available, which are controlled by one of the first control device ("A") in the course of a connection occupied registers are set, and that the second control device ("B") controls the intermediate selection levels (first to last GW) and the third control device ("C") controls the final selection level (LW). 2. Circuit arrangement according to claim 1, characterized in that the control devices ("^ 4", "5" and "C" in Fig. 76) act on setting devices (I, II, III, N ₁ Q in Fig. 76), which are assigned to the individual selection levels (F, S, L and P in Fig. 76). 3. Circuit arrangement according to claim 1 and 2, characterized in that the third control device ("C" in Fig. 76) occupied by a second control device ("B" in Fig. 76) contains switching means to identify the identity of the second control device . 4. Circuit arrangement according to claim 3, characterized in that the third control device communicates its occupied state via special switching means (relay N 1 rC in Fig. 58) to other second control devices, 5. Circuit arrangement according to claim 4, characterized in that the third control device Contains time sequence switching means to prevent two or more free third Control devices are simultaneously occupied by the same second control device, and also to prevent the same third control device by two or at the same time several second control devices is occupied. 6. Circuit arrangement according to claim 5, characterized in that every third control device Includes switching means to control itself with one or more first control devices to connect and to record the identity of the outputs to be set from these. 7. Circuit arrangement according to claim 6, characterized in that every third control device Contains test switching means, via which the free state of the connected first control devices is determined. 8. Circuit arrangement according to claim 7, characterized in that the third control device Has switching means, which after a successful test the connection with the cause the first control device. 9. Circuit arrangement according to claim 8, characterized in that the third control device contains further switching means, after the connection to a first control device to make the idle state of the established line and to connect the To arrange liaison bodies. 10. Circuit arrangement according to claim 1 to 9, characterized in that a call scanner (D in Fig. 76) detects a calling subscriber, occupies a first control device ("A" in Fig. 76) and transfers the identifier of the calling subscriber to it, and that this first control device occupies the setting devices assigned to it (I-III in FIG. 76) for switching through the preselection stages (F and L in FIG. 76), the connection of a free memory (R in FIG. 76) via the preselection stages to the initiating and activating the calling subscriber, and that when the number of the called subscriber is recorded, the memory occupies a second control device ("ß" in Fig. 76) after receiving the group code and transfers the group code to the latter, whereupon the second control unit 609 617/197 I7415VIIIa / 21a ^{s 1} device passes these digits on to the setting devices assigned to it (N and Q in Fig. J6) for switching through the group selection levels (L and P in Fig. 76) and switches off, and that the memory has a third control device after receiving the final digits of the subscriber number called ("C" in Fig. 76) and this transfers the final digits, and that the third control device forwards this information to the setting device assigned to the line selection stage (I in Fig. 76) for setting the line selection stage (S in Fig. 76) and itself then switches off, and that the setting devices (I, II, III, N and Q in FIG. 76) assigned to the individual selection levels are triggered after their setting orders have been completed. Considered publications:
German patent specifications No. 826 16b, 826455, 856629. In addition 25 sheets of drawings © 609 '617/197 8. 56