DE569573C - Circuit arrangement for automatic and semi-automatic telephone systems with memories - Google Patents

Description

The present invention relates to automatic and semi-automatic telephone systems, in which the automatic voters are controlled by a memory, which for Acceptance of a different number of digits is set up.

In such systems, each memory is provided with a storage device whose Capacity is such that it can store the largest number of digits that is used to identify a participant in the system. If such a Memory is used to control the connection to a participant whose Port number consists of fewer digits than the largest ever for one in question coming number of digits, then certain digit memory in the memory is not used. Systems are inefficient as there are certain number stores in each store are not properly exploited.

According to the present invention, ordinary memories which are used to hold a Number of digits set up that is smaller than the largest in the system for use number of digits received, and one or more auxiliary memories provided, of which each associated with a plurality of ordinary memories and temporarily for manufacture a connection with one of the associated ordinary memory becomes, if the number of digits characterizing the desired connection, the digit acceptability exceeds ordinary memory.

This arrangement can be used in networks with different digits Calling numbers are used and is particularly beneficial for large telephone systems that have multiple automatic ones Include telephone exchanges located in different telephone districts and far from each other can be removed because the arrangement according to the invention enables automatic production of connections between such offices without the intervention of an official in the district in which the calling subscriber lives.

So far, such connections were made by a remote officer in the initiating the connection District established, although the office from which the connection originated with automatic Connection devices was equipped. The participants were instructed, if they wanted a remote connection, initially assign a two- or three-digit number to identify a remote connection which has been stored in systems with storage in the memory, and thereby The connection to the remote office was switched through under the influence of this local or ordinary memory. The desired subscriber or basic number was then communicated orally to the remote official. It can be seen that since such a connection to store only a small number of digits in the memory

it was enough to dimension this ordinary storage facility for the local traffic conditions. For example, if the numbering scheme of the introductory district is a six-digit Number dialing provided for local calls, then the memory was given a largest: digit capacity of six digits. However, this capacity would not be sufficient for telephone connections, ίο which is the introductory number for long-distance connections with two or three digits and the desired subscriber number with five or more digits. To remote connections automatically, it would therefore be necessary to adjust the digit capacity of the ordinary memory so that it can store as many digits as for one Remote connection are required. Taking into account the small percentage of long-distance connections this would be highly uneconomical and the ordinary memory would become unnecessarily complicated. The present invention therefore gives a satisfactory solution to the problem by providing the auxiliary memory, which can be added to an existing automatic exchange facility, without extensive changes in the local connection facility of an independent office to require, and which at the same time gives the participants of this office the opportunity to also set up remote connections fully automatically.

Further features of the invention can be found in the following with reference to the drawings given description of an embodiment.

Fig. Ι represents a connection circuit that contains a second call searcher 2LjF, a memory selector RF and a group selector ι GS , via which the connection circuit has access to the following selectors, for example to a second and third group selector, as shown in Fig. 6 schematically is shown.

Figs. 2 and 3 show a main memory designed according to the invention, which contains four sets of counting relays and two control switches R 4 and R 5.

Figs. 4 and 5 show an auxiliary memory which contains a number of auxiliary counting relay sets, a control switch R 6 and a surge transmitter RD and which can be interconnected with the main memory via a selector A RF. Fig. 6 shows a second and third group selector and a transmitter for connections to a remote network.

These illustrations are to be arranged so that Fig. 6 to the right of Fig. 1, Fig. 2 and 3 below Fig. Ι and Fig. 4 and 5 come to rest under Fig. 6.

Fig. 7 shows a connection setup for an embodiment of the invention. Thereafter, the speech path consists of the first call seeker τ LF, the second call seeker 2 LF, three group selectors xGS, 2GS, 3GS and a continuing trunk line TL. The path to the memories branches off before the first group selector, with RC being the main memory and ARC being the auxiliary memory. RF and ARF are switch-on selectors.

In the present embodiment, it is assumed that the capacity of the automatic Telephone system of the initiating network is 80,000 lines, which are made up of three Groups of 20,000 lines each, each attached to two local offices 10,000 Teikiehmer lines exist, and Assemble 20,000 lines for local and long-distance traffic. These 80,000 lines can by dialing a five-digit number. There are precautions by dialing a two digit Number of special operating connections to be established. With such a capacity, local connections will be over first and third group dialers and line dialers established, being five decades of the The first group dialer can be used for connections to the 10,000 lines of the local office. The second ten thousand office believed to be in the same building is housed is over a decade of the first group selector and a local second Group voter reached, of which also five decades for connections to the other Office to be used. These local second group voters are both offices in the way in common that, for example, for connections from an office of the unit of 20,000 lines the five even decades of the second group voter are used for the other office, while for connections from this office to the first mentioned office the five odd ones Decades of the second group selector can be used. Connections to remote offices of the initiating network are made via first, second, third group dialer and line dialer established. The corresponding Decades of the first group voter and the second remote group voter each have one Capacity of 20,000 lines. Five decades of second remote group voters are with the third group voters of the first ten thousand office of the unit for short-distance traffic, and the five other decades are in a corresponding manner as described above, attached to the second ten thousand office.

Special operation connections are made via the first group selector and second special operation group selector manufactured. Nine decades of the

second special operation group selector can be used for special operation connections. The tenth decade is with remote third party dialers tied together. Each of the ten decades of this third group voter can lead to a distant Lead network.

With such a capacity, the main memory (Figs. 2 and 3) has four sets of «Ο Counting relays for those required for a connection five digits. One of these sentences is used twice here. The relays will operated in pairs and count in a known manner. A number of them will be at Dial the digits energized and held, and the complementary relays are used to control the Voter setting.

Each digit, up to ten power surges, is picked up by one of these counting relay sets, each containing six of these relay pairs. To reduce the total number of relays required, some of the relay pairs while receiving or delivering power surges by means of two sets each Additional relays assigned by counting relays de-energized. The de-energized relay pairs are used twice during the dialing or setting process.

These relay sets are used in cooperation with a single pair of auxiliary counting relays.

Furthermore, with the single choice, in which up to twenty current surges may be required, two sets of these counting relays connected in series and finally with the individual Auxiliary relay pair connected, if the number is such that the brush carriage of the line selector on the second half of the contact bank must be switched on. If only a maximum of ten power surges for the single choice are required, d. H. when the number is connected in the first half of the contact bank only one relay set is used in the same way as the other option levels.

The main memory is set up so that it works with a connection circuit (Fig. 1) i and controls the setting of I second and third group selectors, ι which can be designed, for example, so that they create a loop circuit during the free choice to the battery and earth is to be applied from the reservoir. The line selectors associated with this memory | work together, can have a latching position between the tens and ones contacts, from where they can be switched on when the basic circuit in the main memory is closed (Fig. 2 and 3) . As already mentioned, the main memory is used to set up remote connections that are dialed by subscribers of an automatic exchange. This piece of equipment can be added to the central office in due time. The main memory is designed in such a way that, if an introductory number characterizing a remote connection is selected, it can connect itself to an auxiliary memory (Figs. 4 and 5). For this purpose, each memory is connected to nine lines which lead to the contact banks of voters (Figs. 4 and 5) which are assigned to each of the auxiliary memories. The starting circuit for these voters is jointly assigned to the office. It is connected to the first-mentioned memory and the main memory via a resistor which are individually assigned to the memories.

From the above description it can be seen that the transmitter at the outgoing end of a Connection line in one of the ten decades of a special operating group selector intended for long-distance connections is selected in which each decade corresponds to a different direction. This choice is made by main memory controlled, and the direction is characterized in that the calling party dials two leading digits, the are to be referred to below with directional numbers. The first direction digit chosen is in the particular embodiment described here 0, which is a remote connection indicates. The second direction number indicates the remote network to which the Remote connection is to be conducted. According to these directional digits, the participant dials without to wait for the official signal as quickly as possible the main number of the desired subscriber of the distant network. The main number can consist of four, depending on the size of this network consist of up to six digits. Two of these digits are in two sets of counting relays of the main memory, and all digits following these two digits are stored in the auxiliary memory. Except for this subscriber number, which is designated with the main number the calling subscriber can dial two additional or final digits to immediately switch to one connected to the remote office To dial in extension. These final digits are also stored in the auxiliary memory.

From the above it can be seen that the smallest for establishing a long-distance connection the number of digits to be dialed by the calling subscriber is six, namely two directional digits and a four-digit subscriber number; the largest number of digits to be dialed is ten, namely two directional digits, one six-digit subscriber number and two final numbers for dialing an extension. the largest number of when choosing in the auxiliary

The number of digits sent out is therefore six, so that there are six sets of counting relays in the auxiliary memory has been provided for these six digits. With the above-mentioned number of Four digits are already stored in the main memory, namely the two leading ones Digits that indicate the direction and the first two digits of the desired subscriber number. The remaining digits are stored in the auxiliary memory, which is also controls the transmission of the desired subscriber number to the remote network.

In the present embodiment, it is also assumed that the main number of Participants of a certain remote network always consists of the same number of digits. The auxiliary memory therefore has, depending on the second selected direction number Transmission of either four, five or six digits to the dialers of the remote network too steer. If necessary, these digits can be followed by one or two extension digits. If the second digit indicates that the main subscriber number is four digits contains, a special relay arrangement in the auxiliary memory is activated, and this relay arrangement causes that after the receipt of the main contractor number four digits a timer is set, which, if it is after a certain Time is actuated, the connection of the when initiating the connection in use taken connection circuit in the speech position and the triggering of the memory as soon as the last digit to the remote Office has been prepared. The timer is designed so that it, if an extension code has been dialed at the moment when the fifth digit is recorded, and then only after receiving the first extension final digit starts up. When two extension end-of-line digits have been received so that no more digits can be expected, the timer is not operated again, but the connecting circuit is immediate after the transmission of all received digits to the remote network in the speech position switched through.

In a corresponding manner, if the second direction number indicates that the Main subscriber number comprises five digits, another special relay arrangement in the Auxiliary memory energized, which brings the timer to effect for the first time after the fifth digit of the main subscriber number has been received. Two can do this Final digits are selected for which provision is made in the same way in the auxiliary memory is met, as described occasionally with a four-digit subscriber number.

If the second digit indicates that the main tenant number is six Digits, yet another relay arrangement in the auxiliary memory is used to respond brought which the switching on of the timer after receiving the sixth Digit of the main tenant number causes, which again in the already described Way two final digits can be chosen.

From the above it can be seen that the auxiliary memory is responsible for the transmission of the first two Digits of the desired participant through the auxiliary memory from the two sets of counting relays of the main memory is controlled. The transfer of the remaining digits to the office of the remote network is controlled by the counting relays of the auxiliary storage.

The switching processes are described in detail below:

link

a calling subscriber line with a free main memory

When a subscriber initiates a connection by lifting his handset, the calling line is switched through in a known manner via a first call seeker, not shown, to the contact bank of a second call seeker 2 LF shown on the left-hand side of FIG. The following circuit is then closed: Battery in the first call finder, left and right upper contacts S of control switch R 1 in position 1, left winding of relay Nmr, left and right lower contacts Q of R 1, left winding of S ir, earth. Furthermore, the following circuit for relay GIr parallel to relay Nmr is closed: battery in the first call finder, left and right upper contacts S of R 1, winding of GIr, right lower contacts F and G of R 1, break contacts of Gtr, left and right Contacts L of R 1, earth. Both relays respond. The relay Nmr prepares a circuit for the control switch magnet R 1 through its right outer contact. The relay GIr closes the following circuit for the coupling magnet PF of the second call seeker 2 LF at its left working contact: earth, working contact of GIr, left upper and lower contact C of R 1, magnet PF, battery. The magnet PF responds and switches the switching arms of 2 LF to the calling line via the contact bank. As soon as the contacts of the calling line, which is marked by the battery at contact H , are reached, the relay rtr responds via the following circuit: battery, contact H, left and right upper contacts T, left winding of Gtr, right upper one and lower contact L of R 1, earth. The relay

Gtr responds and interrupts the circuit of the relay GIr described above at its break contact, which consequently drops out and interrupts the circuit of the magnet PF , so that the switching arms on the contacts of the calling line come to a standstill. At its left-closed contact, the relay closes the GIR prepared via the right external contact of the relay circuit Nmr

to for the control switch magnet R i. The control switch moves from position ι to position 3. After leaving position 2 , relay Gtr drops out, and the following circuit for relay F ir is closed: earth at the break contact of Rmr, left upper and right lower contact M of R 1 , right normally closed contact from Nmr, normally closed contact from Gtr, right lower contacts G and E from R i, winding from F ir, battery. The relay F ir responds and closes an easily recognizable circuit for F 2r, which in turn closes the circuit of the memory selector RF to the above-mentioned earth at the relay Rmr. The memory selector starts up and looks for a free main memory (Fig. 2 and 3), which is identified by the battery on contact G. This test potential is connected from the battery via the winding of Por, the normally closed contact of Ru zr, the right upper and left lower contact X of R 4 in position 1, a resistor to the contact and switching arm g.

Furthermore, a parallel circuit from the battery is closed via a resistor to the lower right contact X of R 4 in position 1. When a free memory has been found, the relay Gtr responds again via the following circuit: Battery at contact g of RF (Fig. 1), upper left and lower right contact I of R 1 in position 3, left winding of Gtr, left working contact of F ir, earth on the inner normally closed contact of Nmr. The relay Gtr opens the circuit of the memory selector RF described above, which is shut down as a result. The relay F ir also drops out and again brings the relay F zr to drop, which closes the following circuit for R ι at its right normally closed contact: earth at the left normally closed contact of GIr, right normally closed contact from F zr, left lower contact B from R 1 in Position 3, magnet R 1, battery. As a result, the control switch R I moves to position 4, in which the loop of the other participant via the right and left upper contacts Q and the left upper and lower contacts R of R 1 to the a and δ contacts of RF and the impulse relay Isr switch through

The relay Por (Fig. 3) responds slowly via the following circuit for the relay Lmr (Fig. Z) : Earth on a working contact of the relay Por, resistance, lower left and upper right contact G of R 4 in position 1, lower and upper right contact R of R 4, winding Lmr, resistor and battery. The relay Lbr (Fig. 2) with the resistor in series with it is in this circuit parallel to the relay Lmr, and the current flowing through the relay Lmr causes this relay to respond very slowly, so that the control switch R 4 (Fig . 2) advances from position 1 via its normally open contact and contact B of R 4 with some delay. After leaving position 1, the excitation circuit of relay Por at the lower left contact X is interrupted. The relay Por with the parallel resistor at the contact X is held in the connecting circuit running test circuit via a normally open contact of the relay Por and the lower right and left contacts Y. This test potential remains switched on until R 4 ^{leaves position 2 1} Z _2.

The relays Lmr and Lbr therefore remain energized in the circuit running to the normally open contact of Por until the lower left contact G of R 4 is opened after leaving the position ι ¹ Z ₂ . Before this occurs, however, a circuit has been closed from the normally open contact of the relay Lmr via the lower left and upper right contact R of R 4 to the winding of the relay Lmr , so that this relay has current flowing through it during the time during which the lower one The left and lower right contacts of R are closed at the same time, and consequently it drops out with a delay after this circuit is interrupted. At the same time, the earth from the normally open contact of Lmr is connected directly to the winding of the relay Lbr via the lower left and lower right contacts R , so that this relay is energized by the full current flowing through its winding until Lmr drops. When this occurs, the relay Lbr also drops out with a delay, and it then closes a circuit to advance the control switch from position 2. The switching operations described above ensure that control switch R 4 moves to position 3 with sufficient delay. This ensures that the relay Isr is excited via the subscriber loop before the normally closed contact of this relay is connected to the counting relay sets via contact P of R 4. However, if the relay Isr is energized before the control switch has passed position 2, it closes a circuit via its normally open contact to the upper right contact D of R 4 in order to move the control switch to position 3 without further delay. In position 2 "J ₁ becomes

A circuit for the relay Lbr is closed via the normally open contact of the relay Isr, and this relay remains energized even if there: Relay Isr drops out during the transmission of current impulses when the subscriber dials a digit. It only drops out if the participant trips prematurely and thereby causes a very long interruption in the impulse loop.

ίο Let it now be the mode of operation of the memory described. For the sake of a better overview, the reception and transmission of power surges is said to be described separately for each type of the connections determining the memory zn. It goes without saying, however, that these processes actually take place simultaneously.

The participant dials the first digit

The first digit is selected in position 5 of R 4, and the switching of the control switch R 4 via positions 3 and 4 is brought about by the earth connected via the lower right contact D. In position 5, the primary winding of the exchange signal transmitter DTC (Fig. 2) is excited via contact E , and the subscriber receives the exchange signal in a known manner. He then dials the first digit and thereby causes a number of interruptions in the line corresponding to the selected digit, which causes the Isr relay to drop out correspondingly often. When the relay Isr closes its normally closed contact for the first time, it closes a circuit for the relay Lmr, which speaks and switches the control switch from position 5 to position 6. The relay Lmr remains energized until the end of the last current impulse of the first digit and then switches the control switch from position 6 to position 8 via its break contact. When the relay Isr closes its normally closed contact for the first time, a circuit for the first counting relay is closed in parallel with the relay Lmr. This circuit is as follows:

Break contact of Isr, left upper and right lower contact P, break contact of Ld 2r, right upper contact R, left lower contact S, right contact of counting relay Bcr 5, break contact of Bxr, break contact of relay Bcr 1.7, winding Acr 1.7, battery. Acr τ.γ responds and closes a holding circuit in series with the relay Bcri.y. Bcr 1.7 remains short-circuited at the break contact of Isr until this relay responds again, so that the relay Bcr 1.7 can only respond and then switch the circuit from the break contact from Isr to the next counting relay. In this way, a pair of counting relays are triggered by each interruption of the dial. The fifth interruption brings about the excitation of the relay Acr 5 via the normally closed contact of the changeover relay Byr . The relay Acr 5 then causes the relay Bxr to respond via its left normally open contact. This relay energizes the relay Byr via its right normally open contact, while a normally closed contact interrupts the holding circuit of all Acr and jBcy relays with the exception of relay Acr $ . The relay Byr cancels the short circuit across Bcr 5, so that this relay in series with the relay Acr 5 can operate. When the relay Bcr 5 responds, the next current surge is passed to the relay Acr 6 and the holding earth for the other relays is switched off. The counting process then continues until all power surges have been absorbed by the relay set.

80 pairing or conversion of the first

Digit

At the end of the first digit, the control switch R 4 is switched from position 6 to position 8 by the release of relay Lmr, and certain tests are then carried out to determine which first digit has been selected, since the first digit selected is Art the desired connection. Each type of connection requires a different pairing or conversion, which is described below in connection with the dialer setting.

"If a first digit identifying a special service or long-distance connection is selected has been, how later in connection with the production of a special operating or Transmission line is described, also the reception of the digits changed. It is now the reception the remaining digits of the compound are described too assuming that an ordinary one Local connection is selected so that the above-mentioned change does not take place.

The participant dials the second digit

In position 8 of R 4, the break contact of the impulse relay Isr is connected to the relay Lmr and the second set of counting relays via the following path: break contact from Isr, contact P from R 4, break contact from Ld zr, contacts R and S from R 4, Normally closed contact Spr, Contact Der 5. If the second digit is dialed, a number of relays of the second counting relay set are made _{to respond in the same way as with n 5 of} the first digit. At the same time, the relay Lmr responds in the above-mentioned circuit and switches the control switch R 4 to position 9, and when the second digit is completed, the relay Lmr drops again, whereby the control switch Ti 4 is brought to position 10.

Pairing the second digit

The pairing of the second digit is also used in the description of the second elective level explained.

The participant dials the third digit

The third digit is in the same way as the first two digits in position io

ίο and Ii of R 4 added by the third relay set. The circuit from the break contact of Isr runs as follows: break contact of Isr, contact P of R 4, break contact of Ld 2r, contacts R and 5 of R 4, break contact of Sp ir to the contact of the counting relay F er 5.

The pairing of the third digit is also explained in the description of the hundreds dial will.

The participant dials the fourth digit

The fourth digit is received in position 12 and 13 of R 4 by the fourth set of counting relays via the following circuit: normally closed contact from Isr, contact P from R 4, normally closed contact from Ld zr, contacts R and S from R 4, normally closed contact Sp zr to Contact of the counting relay Her 5.

The participant dials the fifth digit

The fifth digit is picked up in positions 14 and 15 of R 4 by the first set of counting relays Acr-Bcr . This relay set is already triggered at this moment after the voter setting of the first selection level has already taken place, so that it can be used again to receive the unit digits and to control the unit selection. The circuit from the break contact of Isr runs as follows: Isr, contact P of R 4, break contact of Ld zr, contacts R and S of R 4 to the contact of the counting relay Ber 5. At the end of the units digit, the relay Lmr drops which As was excited above via the normally closed contact of Isr and the contact P , the control switch R 4 is brought into position 16, where it remains until the election is over or the participant hangs up.

Conversion and voter setting

The transmission and dialer settings are described separately for each type of connection. The following types of connections should be considered:

a) Local connections: The connections require four settings, one setting for the first group selector and the third group selector and two settings of the line voter. Depending on the first two digits dialed, it becomes the first group dialer set to one of the five odd decades.

b) Connection to another office: With a connection to another office a connection to an office in the initiating network is meant. These Connections require settings, namely one each in the first, second and third group selector and two for the line selector.

c) Connections to land offices: Connections to land offices are made via a Established decade of the first group voters. The complementary number of the last four digits the desired subscriber number is sent to the memory of the Landamt, and it an indicator is sent to this memory as to whether the ten-thousand digit is an 8 or was a 9.

d) Special operations connection: Special operations connections require two settings, namely the first group selector and the second group selector for special service connections.

e) Remote links: Remote links require three settings in the preliminary Network, namely that of the first group selector, the second group selector for special operating connections and the third group selector for remote connections. The subscriber number must also of the desired subscriber in the remote network via the outgoing connection line to the Be transmitted to voters of the remote network.

a. Local connections

While the control switch R 4 is moving from position 6 to position 8, after receiving the first digit in position 6 ^:! ₄ and in position 7 '' ._, earth temporarily switched on to check the type of digit recorded. If a 2 has been selected as the first digit, the relay Lor (Fig. 2) responds via the earth connected in position 6 \ in the following circuit: battery, winding Lor, normally closed contact of relay Acr 3.9, normally open contacts of relays Acr 2.8 and Acri .y, normally closed contact of relay Byr, right upper contact M from R 4 to earth at contact K of R 4. The relay Lor holds itself via the left upper contact L from R 4 to earth at contact K and connects in position 1-2 ¹ Z _{4 of} the control switch R 5 earth from the upper right contact C / of R 5 with the relays RTer and RScr, which are energized in series. RTer interrupts the basic circuit with its outer right normally closed contact and also switches to ground on its right normally open contact in preparation for switching control switch R 5 to position 2 ¹ Z ₄ . R 5 is started from position 1 when the control switch R 4 reaches position 7 ^] _o , so that, due to the energized state of the relays RScr and RTer, the control switch after receiving

The first digit immediately moves to position 3 ¹ Z ₄ . The position 2 Y ₄ for setting the selector is overrun when the basic circuit is open, so that the relay GIr (Fig. 1) of the first group selector cannot respond. The control switch R 5 now waits in position 3 ¹ Z ₄ until the second digit has been recorded, which is indicated by the control switch R 4 reaching position 10. As soon as this occurs, R 5 runs from position 3 Y ₄ to 5 ¹ Z ₂ , and during this transition a check is made to see whether an odd or an even digit has been selected and, if necessary, a current surge is applied to the second set of counting relays sent out to get the correct conversion for this type of connection. A short current impulse in position 4 of R 5, if the second digit was even, energizes the relay Etr (Fig. 3). When R 5 overflows position 4 Y ₁ , the relay Etr then gives a current impulse to the second set of counting relays via one of its working contacts, namely via a circuit that connects from earth to the upper left contact B of R 5 via the working contact Etr and the Normally closed contact Rdr (Fig. 2) to the contact of the counting relay Der 5 runs. With every connection in which the relay Lor is energized, a different current impulse is sent by a ^{normally open contact of this relay in position 4 7} _ _e of R 5 via the following circuit: earth at the upper right and lower left contact T of R 5, normally open contact Lor to the contact of the counting relay The 6th In addition to the pairing current impulses described above, which are caused by the relays Etr and Lor , the relay Lor takes part in the rotation of the second set of counting relays if a 0 has been selected as the second digit. If this is the case, the relay Por responds as soon as the last counting relay is energized in position 9 of R 4. via the following circuit: Battery and winding of Por, normally closed contact Ru 2r, normally open contact of relay Der 6, normally open contact from Cr 4.0 , Left and right upper contacts Y of R 4. The response of the relay Por causes the holding earth for all relays Ccr and Der to be switched off when the control switch R 4 is switched from position 9 to position 10, so that all these relays to Garbage come. This occurs because the connection of the holding earth for the second set of counting relays through the upper left and lower right contact N of J? 4 is controlled in such a way that the holding circuit between positions 9 and 10 of R 4 remains if the relay Por is not energized, whereas in position 10 at contact N an interruption is brought about if the earth at the lower left contact N is switched off by Por. If the relay Por is energized in position 9, it immediately causes the relay Etr to respond, and it holds until the control _{switch Qo} ter R 4 is moved beyond position 10, whereupon its holding circuit at the upper right contact Y of R 4 is interrupted. The result of the conversion processes described above is shown in the following table.

Table 1 Local connection. First elective level (first digit a 2)

Aroused
ι000s
relay I. 5 6th Excited auxiliary
relay Surge working 5 · Impulse work 6th Hired Sent out
ι000s
Digit 1.2. 5 6th _ contact Etr
4 Vj of R 5
Energized relays 5 · contact Lor
4 Va ^{of R} 5
Energized relays 6th decade
(1st GW)
Position 5 ¹ Z ₂
from R 5 I. I.2.3. 7- 5- 6th Etr (4 of R 5) I. 7-5-6. I. 6th 9 2 I.2.3.4. 7.8. 5- 6th - I.2.3. 7. 5.6. I.2.3. 5-6. 7th 3 7.8.9. 5. 6th Etr (4 of K 5) I.2.3. 7.8.9.5.6. I.2.3. 5-6. 7th 4th 7. S. 9.0.5. -. 7.8.9.5.6. 5-6. 5 5 Etr (4 of R 5) I. 5-6- 5 6th - 7.8. 5-6. 3 7th Etr (4 of R 5) 7-8. 5-6. 3 8th - 7.8.9.O 6th I. 9 Por and 7.8.9.O I. 0 Etr (9 of R 4) I. 9 (see note)

Note: With the thousands digit 0, all counting relays between positions 9 and 10 of R 4 are de-energized.

The control switch R 5 now moves to position 5 \ ._, and closes the basic circuit via the following path: battery, relay GIr (Fig. 1), switch arm d of the memory selector RC,

Normally closed contact R Tvr, winding Osr, resistor, upper left and lower right contact N from R 5 to earth on the outer right working contact of Lor. The normally open contact of the impulse relay Osr is now connected to the second set of counting relays via the following circuit: normally open contact Osr, upper left and right contacts F of R 4, lower left and upper contact 0 of R 5, normally closed contacts Ehr, Rdr, contact of the counting relay Der 5. The control switch R 1 of the connection circuit (Fig. I) goes to position 5, where the shaft P 2 rotates and temporarily applies earth to the basic circuit with every step. This earth keeps the relay GIr (Fig. 1) energized and short-circuits the impulse relay Usr (Fig. 2) so that this relay drops out with every step taken by the shaft. It can be seen that the counting relays now work in a similar way when sending out current impulses as when receiving current impulses through the impulse relay I sr (Fig. 2). If the digit selected was such that the relay pair Cer 5, Der 5 and their associated relays Dxr and Dyr were not energized, they may be energized during the rush current through the relay Osr and bring the previously energized relays in the same manner as in the Consideration of the power surges sent by the subscriber to the waste. If all counting relays Ccr and Der are deenergized, the last counting relay Der 4.0 is connected to the auxiliary counting relay RS or RT via its normally open contact, the contact from Osr, the contact / from R 5.

When the latter relay responds, it stays in series with RScr via the upper left contact U of R 5 and interrupts the basic circuit at its break contact, so that the shaft P 2 is then stopped. Via its normally open contact and the right inner contact C , it switches the control switch R 5 from position 5 '/., On. The counting relays Ccr and Der are deenergized because the holding circuit at the upper right and left contact G of R 5 is interrupted. Furthermore, the relays RScr and RTer are de- energized when the upper left contact U is opened. The control switch R 1 of the cord circuit (Fig. 1) can meanwhile be in a known manner in the intended position for the free choice or possibly in a position behind this position. In the latter case, the free selection of the first group selector, which is otherwise controlled by the memory by means of the relays Jkr and Jar in position 6 ^{: i} / ₄ and 7 " ₄ of R 5, does not take place. In the present case, the control switch R 5 immediately beyond the position 6 7, which is brought about by the reactivation of the relays RScr and RTer via the normally open contact of the relay Lor and the upper right contact U of R 5. The control switch R 5 now remains in position 7 ³ ^ until the control switch R 4 moves to position 12 and thereby indicates that the third digit has been received.

After the third digit has been recorded, a test is immediately carried out in a manner similar to that described for the second digit to determine whether the digit 0 has been dialed. This is done again by means of the relay Por , which, if a 0 was selected as the third digit, responds in position 11 of R 4 via the following circuit as soon as the last relay has been energized. Battery and winding of Por, normally closed contact Ru zr, upper left contact X of R 4, normally open contact of relay Fhr (which is excited via the normally open contact of Ecr 4. ο), earth on the normally open contact of relay Bcr 6. The relay Por keeps on positions is moved away 11-17 of R 4 via the contact Y, but it does not perform switching operations, until the control switch R 5 via the position 7 _^8/4. When this occurs, the following occurs: First, if the relay Por has been energized as a result of selecting a 0 as the third digit, the holding circuit for the third counting relay set, which is dependent on the contact H of R 5, is between the positions 7 ^:! / ₄ and 8 "/ 4 interrupted, so that all these relays drop out in this case. If the relay Por is not energized, the relays remain energized via the normally closed contact of relay Por and the lower right contact ' H of R 5 If relay Por is energized, or if an even digit has been selected, relay Ehr is energized via the following circuit: battery and winding of relay Ehr, working contacts of relay Efr, contacts of counting relays Ecr and Fer to earth or working contact from Por to The relay Efr is energized when the control switch R 5 overflows the positions 8 γ., - 8 ^{; i} / j via the following circuit: battery, winding of Ef V, normally closed contact of Sp ir, lower right and upper contacts L of R 5, normally closed contact Ru zr, earth at the lower left contact 0 of R 4. The Ehr relay responds to all even numbers and stays in position 16 via the lower left contact Q of R 5. If the Ehr relay is energized, is driven over the Stell ung 9 given by R 5 a current surge from the upper right contact Q via a normally open contact of the relay Ehr to the third counting relay set. Furthermore, if the selected thousand digit was odd, which is indicated by the fact that the relay Etr is not energized, when the position 9 is overrun

IO

% of R 5 a current impulse is sent from contact L of R 5 via a normally closed contact of relay Etr to the contact of counting relay Fer 6. The result of the conversion switching operations described above is shown in the following table:

Table of hundreds choice

Dispatched Frrp ** ■ te s I. 5 · 6th Excited Impulse 5- Just 1000 he Odd 1000's Hired ι oo he 1.2. 5- 6th Auxiliary relay Working contact 5- Etr excited Etr not excited decade Digit ι oo he I.2.3. 7- 5- 6th Honor 9 from R 5 7. 5.6. Hired Impulse f3 GW) 10 relay I.2.3.4. 7.8. 5. 6th Energized relays 7. 5.6. decade Break contact I. 7 8 9 5- 6th 7-8.9-5-6. (3rd GW) 9 7 »from JR 5 2 7.8.9.0.5. Honor I. 7.8.9.5.6. Position 10 Y, Energized relays 9 3 - I.2.3. I. IO. i. 6th 7th 15th 4th Honor I.2.3. 8th 1.2.3. 6th 7th 5 ■ - 8th 1.2.3. 6th 5 6th Honor 6th 5-6. 5 7th - 6th 5-6- 3 8th Honor 4th 7.8. 5.6. 3 20th 9 - 4th 7.8. 5.6. I. O Honor Por 2 7.8.9.0.5.6. I. (11 of A4) 2 7.8.9.0.5.6. 9 (see note) IO i. 6th 25th

Note: If the hundreds digit is a 0 ^{,: i} / ₄ and 8 ^;! / ₄ de- excited by R 5.

When the control switch R 5 reaches the position 10 '/ ₄ , it closes the basic circuit to the third group selector as follows: iü contact of the memory selector, break contact of relay RTer, winding of relay Osr, resistor, upper right and left contacts N of R. 5 to the / "- contact of the memory selector. The relay O sr now responds again together with the relay GIr, not shown, of the third group selector, and it drops out at every step that the camshaft, not shown, of this selector makes connected to the third set of counting relays via the following circuit: normally open contact Osr, left upper and lower contacts F of R 4, left lower and right upper contact. from R 5 to the contact of the counting relay Fer 5. The number of times to be carried out by the camshaft of the third group selector Steps is now determined by the number of relays previously energized according to Table 2, and if the relays RScr and RTcr are energized again at the last step the basic circuit is interrupted and the camshaft of the ■ third group selector is stopped. At the same time, the control switch R 5 of the memory is switched from position 10 Y ₁ to position 11 '/ ». In position 11 '/., Of R 5, the battery is connected to the if contact of the memory selector RF via a resistor and the contact M of R 5 and, at the same time, to earth via which are all counting relays between positions 7

Winding of relay Jhr and contact N of R 5 applied to the f-contact of the memory selector. The relay Jhr now speaks via the loop (not shown), which is closed in the position of the third group selector provided for free selection, after the battery applied to contact M of R 5. Once this occurs, the relay yrs brings the relay Jar to respond, and this relay brings the control switch R5 immediately from position 11 * / * ™ the position 12 Va - ^ ^he energizing circuit of Jar is now the contact E of R5 interrupted , and the relay Jar is held independently of contact E of R 5 • via the normally open contact of Jhr. The third group selector is now looking for a free line as long as the bridge relay, which is in series with relay Jhr, is energized or until a free line has been checked. In the latter case, the third group selector moves from the position provided for free selection to a waiting position and thereby briefly interrupts the wires of the basic circuit, causing the relay Jhr to drop out. By briefly opening the make contact of Jhr , the relay Jar is de-energized, which is in position 12 ^! / ₂ of R 5 cannot respond again, even if the relay Jhr there responds again as soon as the third group selector closes the α wire of the basic circuit again. The dropped relay jar is now preparing over the top left

509573

Contact D of R 5 provides a circuit for switching the control switch 22 * 5 from position 12 ¹ J ₂ . This circuit is closed by contact N of R 4 as soon as the control switch R 4 is in position 14. got. When this happens, this indicates that the fourth digit has been included, and the control switch R 5 goes from position 12 ¹ J ^ to position 13 ¹ J. ,, in the

ίο dialing ten is carried out in the usual way. Since no conversion or pairing is required for dialing the tens, it will not be described further. After completion of the tens, the relays RScr and RTer respond again via the normally open contact of O sr and switch R 5 to position 14 ¹ J. , where it remains until the ones digit has been recorded, which is indicated by the fact that R 4 reaches position 16.

When this happens, R 5 is advanced from position 14 ¹ J., to 16, and in this position the singles selection takes place in one of two different ways, depending on whether an odd or an even hundreds digit has been selected. In the case of an even hundreds digit, the line selector is set to a number in the first half of its contact bank, and the dialing then continues as a forward dialing, and the ones contact to be occupied in this case depends solely on the ones digit selected. The normally open contact of the relay Üsr is then connected via the normally open contact of the relay Ehr, which is energized at an even hundred digit , to the set of relays Acr and Bor through which the units digit has been recorded. If an odd hundreds digit has been dialed, however, a contact in the second half of the line voter contact bank is seized and there are ten additional steps to be taken before the actual single dialing begins. This is achieved in that the normally open contact of the surge relay Osr is first switched through to the second set of counting relays via the normally closed contact of Ehr , and only after all these relays have been energized is connected to the relay set Acr, Bcr via the contact / of R 5 . In this case, the second relay set is connected in series with the first, and the brush trolley (not shown) of the line selector must first make ten steps before the normally open contact of the surge relay is connected to the single relay.

Connection of the connection circuit (Fig. 1) after completion
of choice

From the lower left contact T of R 5, earth is connected via a resistor to contact e of the memory selector, via which the relay S 2r of the connection circuit was energized from the point in time in which the connection circuit was connected to the memory. This earth is switched off after the control switch R 5 leaves the position 16 '/. As a result, the relay S zr is de-energized, so that the control switch of the connecting circuit can then be switched from position 8, which is behind the position provided for free choice. When you leave this position, the connection circuit interrupts the contacts Q and E of R ι the receiving current surge circuit to the memory, so that the relay Jsr is constantly falling. This causes the relay Lbr (Fig. 2) to drop out and the control switch R 4 to move beyond position 16. In the meantime, the control switch R 5 has been switched beyond position 18, namely via a break contact of the relay Jar, which cannot respond in this position because the circuit via the test switch arm of the memory selector is already connected to contact N of R ι in the connecting circuit (Fig . 1) is open. When the control switch R 5 reaches position 1, it switches earth to the lower right contact C of R 4 via contact R of R 5, so that R 4 can then continue from position 18 to the rest position. From this moment on, the memory is free for a new connection, since then all relays that were still energized are de-energized.

b. Choice of another office in the initiating network

Outgoing connections to another office in the same network are indicated by that the first digit is 3, 4, 5, 6 or 7.

As soon as the first digit has been recorded, a test is carried out to determine the number dialed ^{by means of an earth temporarily switched on in position 6: i} ₄ of R 4. If number 3, 5 or 7 has been selected, no auxiliary relay will be energized; if, on the other hand, 4 or 6 has been selected, the relay Ttr responds via the following circuit: battery, winding of Ttr and then either via the normally open contact of relay Acr 6 and the normally closed contact of relay Bcr 1.7 to earth or via the normally closed contact of relay Byr and the normally open contact of the relay Acr 4.0 to earth. If the relay Ttr is energized, in position 7 '/ 2 ^of R 4 ^a pairing current impulse is sent from the lower left contact D of R 4 via a normally open contact of the relay Ttr to the contact of the counting relay Bcr 6. The effect of this couple

rush current and the consequent selected at each of the above-mentioned digits The decade of the first group voter can be seen in Table 3.

By closing the lower right contact ο in position 8, R 4 brings the control switch R 5 out of position i, and R 5 now remains in position 2 ¹ J ₄ because the relay Lor is not energized. In position 2 * / ₄ the basic circuit is now closed, from the relay GIr (Fig. 1) in the connecting circuit via the switching arm d of the memory selector, normally closed contact RTer, winding Osr, via a resistor to earth at the lower left contact U of R 5. The The normally open contact of the impulse relay Osr is connected to the first set of counting relays in the following way: normally open contact from Osr, left upper and lower contacts F from R 4, left upper and lower contacts / from R 5, normally closed contact from Ru xr to the contact of the counting relay Ber 5. The choice then takes place according to the digit chosen, as in

Tabel

i. Elective level

Connection to another office i. Choice (10 ooo) position 2 ¹ ^ ^of R 5

10,000s
Digit Excited 10 000 er
relay Excited
Auxiliary relay Current surge Ttr
position
7 Y ₂ of R 4
Energized relays Elected
decade
(i. GW)
position
2 V ₄ of i? 5 3
4th
5
6th
7th I.2.3.
I.2.3.4.
5 ·
5-6.
7. 5.6. Ttr
Tir I.2.3.
I.2.3.4. 6th
5 ·
7 5-6-
7. 5.6. 8th
6th
6th
4th
4th

Table 3 is shown instead. After the selection has been completed, the RTer relay, when responding, moves the connection circuit (Fig. 1) to the position provided for free selection and the memory from position 2 * / ₄ to position 3 ¹ ^. R 5 now remains until the second digit has been received, which is indicated by the fact that R 4 has reached position 10. If this happens, R 5 runs immediately after position 5 ¹ Za. ^{Un (} i on transition from 3 Y ₄ to 5 ¹ ^ the second relay set is set, as can be seen from table 4. First, earth is temporarily switched on in position 4, whereby with a second even digit the relay Etr, in the same way as described for a local connection, The relay Etr in position 4 ^] / ₄ of R 5 sends a short current impulse to the second relay set via one of its normally open contacts . Another current impulse is sent out via a normally open contact of this relay in position 4 ^T / ₈ of R 5. In addition, if the second digit dialed was a 0, the relay For in position 9 of R 4 will respond and, if the control c holder R 4 from position 9 to position 10, all relays to drop and at the same time relay Etr to respond.

When the control switch R 5 reaches the position 5 ^J / ₂ , it closes the basic circuit again in the following way: switching arm d of the memory selector, left normally closed contact from Ld 3r, normally closed contact from RTer, winding Osr, normally closed contact from Lor, left and right upper contact N of R 5, right break contact of Ld ^ r, switching arm f of the memory selector. It should be mentioned that a balancing resistor, which was switched on with the first dialing and with a local connection also with all other dialing processes in the basic circuit, is now short-circuited via a normally closed contact of the relay Lor , for the reason because the second and the following Dialing processes of the type of connections now to be considered take place via a connection line to a remote office. A balancing resistor is then switched on in the second group selector, which together with the resistance of the connecting line results in a total resistance of the same value as that already mentioned. If the connection runs via a local second group selector, a balancing resistor is switched on in this selector.

The normally open contact of the surge relay Osr is connected to the second relay set, and the camshaft of the second group selector is set according to Table 4. After completion

the choice will he 5 cycles through the responsive relay RT the control switch in position R 5 ¹ J ₂ to 6 _^3/4 and the second array selector in the time allocated to the free choice position. The control switch R 5 remains in position 6 ³ Z ₁ until the relay Jhr via the loop, which is closed by the second group selector in the position for free selection, after the battery connected to contact M of R 5 via a high resistance appeals to. When this happens, will

R 5 switched on in a corresponding manner as before. The relay Jar responds and adheres to it in position 7 _^3/4 on the working contact of yrs. The relay of Ye and Jar thus control the choice of the second group selector in the known manner and hold the control switch R 5 at position 7 _^3/4, until the free choice terminated and reaches the position 12 to the control switch R 4, whereby indicates that the third digit has been recorded. If so, run

Tabel

Connection to another office 1000 election (position 5 V ₂ of R 5)

Elected
ι000s
Digit Excited
1000 relay 5 · Excited
Auxiliary relay Impulse
Working
contact Etr
Position 4 ' _t 5 · Odd 1000's
Ttr not energized
Hired
decade
5 7th, from R 5
, 2. GWj Just 1000 he
Ttr excited
Impulse
Working
contact Ttr A
asked
decade
(2nd GW)
= Ii ₁ 5.6. Energized relays 5 · IO 4 Vs ^{of R} 5
Energized relays from J? 5 I. I. 7. 5-6- " I. 7. 5.6. 8th I. 6. 9 -? 1.2. 7.8. 5.6. Etr I.2.3. 7. 5.6. S. 1.2.3. 6th 7th 3 I.2.3. 7.8.9. 5.6. - I.2.3. 7. S. 9.5.6. 6th 1.2.3. 6th 7th 4th 1.2.3-4- 7.8.9.0.5.6. Etr 7.8.9.5.6. 6th 5.6. 5 5 - I. 4th 5-6. 5 Ο Etr 4th 7.8. 5-6. 3 7th - 7.8. 5 6. 3 S. Etr 2, 7.8.9.0.5.6. I. 9 - IO 7.8.9.0.5.6. I. 0 Etr Por i. 6th 9 (9 of R 4) see note

Note: With thousands digit ο, all relays between positions 9 and 10 of R 4 are de-energized.

¹ ■ ', and at

the control switch to position 10

Transition from 7 ⁱ / ₄ after 10 _^2/4 the hundreds relays are set in exactly the same way as already described for a local connection. The selection now proceeds in the same way as for a local connection, and reference is therefore made to the corresponding part of the description of the local connection.

c. Connections to land offices

In the present exemplary embodiment, connections to regional offices are established via decade 2 of the first group selector, and they are identified by the introductory number 8 or 9. If an 8 or 9 is selected as the first digit, the control switch R 4 causes the series relays Ru xr and Ru2, r to respond when changing from position 6 to 8. The relay Ru xr closes a holding circuit for its own via the normally open contact of the relay Acr 5

Winding and the inner winding of the relay Ru zr. Furthermore, the relay Ru zr holds itself independently of the counting relay via its outer winding to the contact L of R 4 in the positions 2-17. To distinguish that, as a first digit has been selected 9, the relay Rar is / placed in position 1 ⁵ ₈ of R 5 through a contact of the relay Ru xr and a make contact of the relay Acr 3.9 to respond. The circuit is as follows: earth on contact of R 5, normally open contact of Acr 3.9 and Ru xr, winding Rdr, resistor, battery. The relay Rdr holds itself via the contact L of R 4, and it is the relay which has to indicate to the memory of the Landamt that the selected ten-thousand digit was a 9. This is accomplished by directly applying earth to the wires of the basic circuit so that the registry of the land office will perform a test on this earth before it moves into the first position for the voter setting

and, if a g was selected as the first digit, a relay can respond.

In addition to the contact via which the relay Rdr responds, the relay Ru xr also has a changeover contact, the purpose of which is to set the camshaft P 2 of the connection circuit (Fig. I) to the second decade for a connection to a rural office. When the control switch R 5 reaches the position 2 Y ₄ 1.0, it closes the basic circuit in the same way as it was described for a connection to another office; but the normally open contact of the impulse relay Osr is now connected directly to the contact of the relay Bcr 4. o via the normally open contact of the relay Ru ir. This causes after the camshaft P 2 has performed the connecting circuit two steps, the relay RSER and RTER already addressed and have interrupted the basic circuit, as .for a connection to a land office relay Byr already by selecting an 8 or 9 by the subscriber is excited. After the first selector setting, the first set of relays will drop out as usual, and relay Ru xr will drop out as well. Its task is then completed, and it now switches the normally open contact of the impulse relay Osr back to the contact of the relay Bcr 5, so that the relays are counted again in the usual way when the last selector is set. The relay Ru 2 r, however, continues and prevents any conversion for the other digits, so that the memory of the Landamt receives the complementary number of the number of rushes sent by the subscriber for each digit. To prevent the pairing and conversion, the relay Ru zr performs the following switching operations: It interrupts the circuit of the relay Etr, so that no pairing _{current impulses in position 4 Y 4} can be sent from R 5 to the second relay set. It interrupts the circuit of relay Por so that this relay does not respond in positions 9 and 11 of R 4 and therefore cannot trigger the second or third counting relay set if the second or third digit should be an ο. It also interrupts the circuit, is applied via the in positions 8 Y ₂ -9 _^3/4 earth at the contact L of R 5, so that the relay Efr / ₄ can not respond in the positions 8 Y ₂ -8 ³ and consequently, the transmission of a pairing current impulse to the relay in position 9 of hundreds of R 5 and further to the hundreds relay in position 9 _^5/8 of R 5 is prevented through the normally-closed contact of the relay Etr.

The Ehr relay is energized via a ground temporarily switched on in position 15 Y ₄ of R 5, so that the normally open contact of the impulse relay Osr is directly connected to the contact of the relay Bcr 5 and not to the second relay set via the normally open contact of Ehr during the last setting process will.

In addition, the relay 2 includes Ru r a work contact a circuit for relaying the control switch from the positions 6 _^3/4 and 11 Y _2,

As already described, the relay Rdr is energized if a 9 was selected as the first digit, and it connects earth to the «-wires of the basic circuit. As soon as the register is connected to the Landamt, it performs a test on this earth, and after it has been determined whether an 8 or 9 has been selected, it closes the basic circuit for the voter setting, which is in position 5 Y ₂ of R 5 takes place. When this relay is energized, the normally open contact of the surge relay Osr is first connected to the resistor in series with the latter relay via the normally open contact of the relay Rdr. This causes the relay Rdr to drop out, so that it disconnects the earth from the α wire of the basic circuit and reconnects the normally open contact of the impulse relay Osr to the second relay set. The setting then takes place in the usual way.

Special business connections

Special service connections are characterized in that a 1 is selected as the first digit, and in the present exemplary embodiment they are established over the decade 10 of the first group selector. Upon receiving the first digit 1 of the control switches R 4 brings about a at position 6 _^3/4 temporarily closed contact, the relay Spr via the following circuit to the response (Fig. 2): Earth at the contact M of R 4, normally closed contact Byr, working contact Acr 1.7, normally closed contact Bcr 2.8, winding Spr, battery. Spr stays in positions 2-17 via contact L of R 4 and causes the relays Sp ir and Sp 2r to respond. The immediate consequence of the response of the relay Spr is that in positions 8 and 9 of R 4 the receiving circuit for the second digit is switched from the second to the third relay set, so that the second digit of the special operation connection is stored by the relays Ecr and Fer will. Another consequence of the response of Spr is that, as soon as the second digit has been received and the control switch R 4 reaches position 10, earth from a normally open contact of the relay Sp 2 r is connected to the left inner contact C of R 4, so that the control switch

is switched over to position 15 and waits in position 16 until the selector setting is finished. As soon as the first digit has been recorded, the control switch R 5 is brought to position 2 ' ₄ , where the first selector setting takes place in the known manner, and since only one pair of counting relays A er and Bor is energized, the first group selector is on the tenth decade set. After completing this choice, R 5 remains in position 3 ¹ ! stand until the second digit has been added, and when this is the case it runs into position 5 '_'.,. But before the basic circuit at contact N can be closed, the relays RScr and RTcr respond in series via a normally open contact of the relay Sp ir to earth at contact V. As a result, while the basic circuit is opened at a normally closed contact of the relay RTcr, the

brought about further switching of the control switch R 5 from position 5 ¹ Z ₂ . The relay RTcr switches the control switch R 5 in the same way from position 6 ^{: i} / ₄ . Furthermore, the control switch R 5 is switched over the position 7 "J ₁ , because meanwhile

the control switch R 4 has reached position 12 in the manner described above and the relay Jar is not energized. R 5 now moves into position 10 ¹ Z ₄ , where the second selector setting takes place by means of the third relay set. If the positions 8 Va " ^{8 ?} 'U are exceeded, the relays Efr and Ehr cannot respond because the circuit of the first relay is interrupted at a break contact of the relay Sp ir . As a result, in position 9 of R 5 there is no pairing current surge to the third relay set For all digits, however, R ^{5 sends out 5} / _s via contact L and a break contact of relay Etr in position 9. It should be mentioned that if ο is selected as the second digit, relay Por in position 11 of R has responded 4 so that R 5 in this case, during the transition from 7 ¹ _li after 8 ¹ J., but stimulates all the relays of the third relay set. thus, when R 5 has reached the position 10 ¹ Z _4, an apparent from Table 5 Number of counting relays energized and the second group selector provided for special operating connections is set to a decade according to Table 5.

Tabel

Special service connection (second dialing level) Remote connection (third dialing level)

· .. chosen Aroused 5 · Aroused Rush quiet Hired
decade Digit 100 relay 5-6- Auxiliary relay contact Etr (Special amounts for GW (j. row) 7. 5.6. 9 ⁵ _i8 of R 5 or third core 7.8. 5.6. Energized relays GW) position I. I. 7.8.9. 5.6. _ 10 ^l j of Ii 5 _? 1.2. 7.8.9.0.5.6. Ί. 6th 9 3 I.2.3. 1.2. 6th 8th 4th I.2.3.4. 1.2.3. 6th 7th 5 1.2.3.4. 6th 6th ti 5-6. 5 7th 7. 5.6. 4th 8th 7.8. 5.6. 3 (note z) 9 7 8 9 5-6- Z υ (Position 11 7.8.9.0.5.6. I. from R 4) 6th 10 (Note i)

Note 1: If an ο is selected as the second digit, Por responds and brings all relays to waste between the 110 ^{: 1 3} of R 5.

when the third decade for long-distance connections

Positions 7

^{: 1} _; · ₄ and 8

/ ₄

Note 2: The number 17 is suppressed, is provided.

When the number dialing is finished, controls

the memory in the positions 11 ¹ ^ ₂ and 12 ¹ Z ₁₁ in the manner already described, the free choice of the special operation second group selector. As soon as a special service connection line is seized by the group selector, the «-wire of the basic circuit in the group selector is interrupted, so that the relay Jhr is de-energized and the relay Jar drops out. As a result, R 5 is immediately ^{advanced from position 12 1} Z ₂ , since, as stated above, control switch R 4 has already reached position 16. R 5 is now switched on beyond the position 16, since the relays RScr and RTcr are re-energized via the contact V in the positions 13 ¹ Z ₄ -IO and a normally open contact of the relay Sp 2, r . The control switch R 5 thus runs at

i6

at the normally closed contact of the RT relay, the basic circuit is open beyond positions 13 * / ₂ and 16.

After leaving the position 16 ¹ J ₉ , the earth, which held the connection circuit (Fig. 1) in the position behind the position intended for the selector setting, is switched off at contact T of R 5, so that the control switch of the connection circuit only switches to the Position 9 is reached when the second • group selector for special service connections has had the opportunity to switch through the basic circuit to the connection line intended for special service connections, see above

can that the monitoring relay S _^3/4 zr address of the connecting circuit in position 8 after the voltage applied to the special operating line ground connection and shut down the control switch of the connecting circuit in position. 9 The memory is then triggered in the manner already described for local connections.

Remote connections

A long distance connection is characterized by the fact that the first digit dialed is a zero is. The second dialed digit identifies the network in which the remote connection is to be established is. After these first two introductory digits, the participant can as quickly as he can and without waiting for the official signal, the main subscriber number of the desired subscriber of the remote network. The desired subscriber number can be either, depending on the numbering scheme of the remote network four, five or six digits, which, as already mentioned, optionally include one or two digits for direct dialing of private branch exchanges.

Of the above-mentioned digits, four are always in main memory and the remaining digits stored in an auxiliary memory (Fig. 4 and 5).

As soon as a 0 is selected as the first digit, the memory immediately looks for an auxiliary memory by closing the starting circuit of the selector ARF belonging to the auxiliary memories and applying a test potential to the test contact in the contact banks of this selector. The number of auxiliary memories is chosen so that a free auxiliary memory can be found through the main memory during the time during which the subscriber dials the fifth digit, since this is the first digit to be stored in the auxiliary memory.

As already mentioned, the connecting lines to the various remote networks originate from third group selectors, which according to the present exemplary embodiment are reached via decade 10 of the first group selectors and decade 3 of the second group selectors provided for special service connections. This means that the main memory must control three setting processes before any digit of the number of the remote party is sent out. The first two digits, which are transmitted to the main memory and which identify the direction, must therefore control these three setting processes. This is done in the following way: The fact that a 0 has been selected already indicates a long-distance connection, so that this is a sufficient indication that the tenth decade of the first group selector and the third decade of the second group selector intended for special service connections are closed choose is. The first selector setting is now controlled by setting the first counting relay set , ie the relays Acr and Bor, by the first digit selected by the subscriber. The second dialer setting is an artificial dial and is not controlled by any digit dialed by the subscriber. It is controlled by the second set of counting relays Ccr and Der . The third choice is the choice that corresponds to the second digit, since each decade of the third group voter corresponds to a specific second digit. The third choice is controlled by the third set of counting relays Ecr and For and therefore requires that the second digit be routed to the third set of relays. As soon as a 0 has been received as the first digit, the receiving circuit is switched on in such a way that the second digit is picked up by the third set of counting relays. This implies that the third and fourth digits are necessarily routed to the fourth and fifth sets of counting relays. After the fourth digit has been received, the receiving circuit is switched again in such a way that the current pulses sent by the subscriber reach the auxiliary memory (Fig. 4 and 5).

After the third choice has been completed and the transmitter (Fig. 6) of a free connection line leading to a remote network has been seized, the auxiliary memory controls the transmission of the desired subscriber number to the remote office. As stated above, the first digit of the main subscriber number is on the fourth relay set (relays Ger and Her in the main memory, Figs. 2 and 3), the second digit on the first relay set (relays Acr and Scr) and the remaining digits on the different ones Relay sets of the auxiliary memory are stored. If the auxiliary memory sends out the different digits of the desired subscriber number, the first two are sent out depending on the number of relays, which in the fourth

lind the first relay set of the main memory energized are.

As already mentioned, the desired subscriber number can consist of four to six digits exist, to which, if necessary, to directly dial an extension one or two Digits can follow. Since it is not yet known whether these last two digits follow or not, the auxiliary memory is designed so that after receiving the complete Main subscriber number a timer switches on, which after a predetermined Time, for example 10 seconds, of both the main and the auxiliary memory \ 'on the calling subscriber line switched off, if no extension numbers are dialed within this time. If only one Extension number is dialed, the timer comes after receiving this last digit for effect. If two extension numbers are dialed, the waits The memory does not save the timing of the timer; it switches itself off after the transfer the desired subscriber number for the remote office regardless of the time switch even from the calling subscriber line. So that the auxiliary storage knows whether the timer has to be activated after the fourth, fifth or sixth digit of the desired subscriber number has been dialed, the auxiliary memory transmitted from the main memory an identification process, by which indicated is how many digits the main subscriber number consists of. For this purpose it is assumed that the main subscriber number always contains one and the same number of digits for a certain traffic direction; for example, assume that in the direction corresponding to the digits 04, five digits are always required, while For example, the directional digits 07 require six digits. This of course depends on the size of the network, which corresponds to the selected directional numbers. Of course, the extension numbers can any number of digits mentioned above can be appended.

Depending on the size of the second digit selected, the auxiliary memory has to control the transmission of four, five or six digits before it switches on the timer. Once the timer has been switched on, the extension number must follow within the time after which the timer takes effect. The identification of the auxiliary memory, whether it has to control four, five or six digits, is given by applying earth to one of the contacts marked 4 Z), 5 Z) or 6 D in Fig. 3, which via three switching arms of the auxiliary memory selector with the relays D ^ r, D $ r, D 6r are connected in this memory. The contacts 4 Z), 5 Z) and 6 D can now be combined with ten other contacts 1, 2,

3 0 be wired, which of the received

correspond to the second digit. If, for example, in the example mentioned above, the main subscriber number for the directional digits 04 consists of five digits, contact No 4 must be wired to the contact 5 Z), and if the main subscriber number for the directional digits 07 consists of six digits, contact No 7 is with wire to contact 6 D.

The switching operations for a remote connection will now be described in detail. The reception switching processes in the main memory are not described in detail, however, since these have already been explained in the description of a local connection. ⁸ <>

As soon as the first digit 0 has been received and the last counting relay Acr 4.0 of the first set of relays is energized, the relay Ldr (Fig. 3) is connected from earth to a normally open contact of relay Byr via a normally open contact of relay Bcr 4.0 and the upper and lower left Contacts Z of the control switch R 5 made to respond. The relay Ldr stays in positions 2-17 via contact L of R 4 and brings the relays Ld zr, Spr (Fig. 2) via a normally open contact. and Ld ^ r (Fig. 3) to respond. The relay Spr in turn energizes the relay Sp ir (Fig. 2), but the relay Sp zr does not, because the earth for this relay is switched off by a normally closed contact of the relay Ldr. The relays Spr and Sp ι r ensure that the normally closed contact of the surge receiving relay I sr for the second digit is switched from the second to the third set of counting relays (relays Ecr and Fer) . Furthermore, the receiving circuit for the third digit in positions 10 and 11 is switched from R 4 to the fourth set of relays Ger and Her , and for the fourth digit in positions 12 and 13 of R 4, the receiving circuit is switched to the first set of Counting relay switched. If four digits have been received in the manner described above via contact P of control switch R 4, the receiving circuit is switched to the auxiliary memory (Fig. 4 and 5) by the response of relay Ld zr (Fig. 2). The relay Ld zr responds via a normally open contact of the relay Ld ir to earth at the lower left contact Zi of R 4 in positions 14-16. All other digits are therefore stored in the auxiliary memory. At the same time, the relay Ld zr switches the control switch R 4 from position 14 to position 16 by applying earth to the lower left contact C of R 4. The control switch remains in this position until the selection is completed.

iS

It should be mentioned, however, that the relay Lbr remains connected to the normally open contact of the surge receiving relay Jsr, although the normally closed contact of this relay can be connected to the auxiliary memory, so that the triggering of both the main and the auxiliary memory depends on the relay Lbr of the main memory is.

The relay Ld ^ r connects the battery via two parallel resistors and two break contacts of the relay Isr to the test contact of the switch- on selector of the main memory and at the same time closes the starting circuit for this selector via another resistor. The relay Fs xr shown in the auxiliary storage (Fig. 5) responds and causes the starting relay As xr to respond, which controls the circuit for the clutch magnets PF 1 of all free auxiliary storage switch-on selectors .4.Fi? (Fig. 4 and 5) closes. As soon as a selector reaches the test contact, the relay Rtr (Fig. 5) responds, which stops the selector and closes a circuit that runs from earth via its own right, low-resistance winding and the winding of the relay Shr to the test switch arm i . This marks the test circuit as occupied for all other voters. At the same time, the relay Fs xr is short-circuited, so that it comes to a drop and as a result all other voters are shut down. In order to avoid double tests, the relay Shr responds slowly. It causes the relay Brr to respond via a resistor to the battery. Brr performs the following switching operations:

Firstly, it causes the relay ear (Fig. 4) to respond, which switches through all switching arms of the switch-on selector ARF to the main memory via the working contacts of the relay Brr or ear.

Secondly, Brr switches the control switch 22 6 (Fig. 5) of the auxiliary accumulator from position 1, which remains in position 2.

Thirdly, the relay Brr switches the holding switch arm c via the contact D of the control switch R 6 parallel to the test switch arm i, so that the auxiliary memory is now kept switched on via a line switch arm of the selector.

Fourth, in positions 18-2, relay Brr applies earth to contacts K, L and M of control switch R 6.

From the above it can be seen that from the moment Brr and the ear are excited, the auxiliary memory is ready to receive the various digits that the calling subscriber sends to the auxiliary memory, since the receiving circuit from the break contact of the relay Isr (Fig. 2 ) of the main register is now completed in the auxiliary memory via the switching arm f of the switch-on selector and a working contact of the relay ear to the counting relay sets and at the same time the holding earth for the counting relays is applied through the contacts K ₁ L and M.

Since control switch R 4 has reached position 7 Y ₂ , control switch R 5 has been advanced from position 1, and in position 2 Y ₄ , the first selection is carried out by the first set of counting relays. Since all these relays were energized by dialing the digit 0 and the first group selector must be set to the tenth decade, their holding earth between positions 6 and 7 of R 4 is switched off by the leftmost normally closed contact of the relay Ldr. This normally closed contact switches off the earth applied by contact H of R 5 to contact L of R 4, via which the first set of counting relays is held, so that only the earth at contact K of R 4 is in positions 2-6 and 7-17 remains on. As a result, all relays drop out between positions 6 and 7 of R 4. When the position 7 Y ₂ is passed, the contact D of R 4 sends a current impulse via a normally open contact of the relay Ld xr to the counting relay pair Acr-Bcr 6, so that this relay pair at the beginning of the selection in position 2 Y ₄ of R 5 is energized alone and the camshaft P 2 (Fig. 1) of the first group selector makes ten steps. The second dial takes place when the second digit has been received and it is controlled by the control switch R 4. The control switch R 5 remains in position 3 Y ₄ until then. The second dial is controlled by the second set of counting relays, none of which is energized by a received digit. The special operating group selector is to be set to the third decade, and in order to achieve this, the line from the normally open contact of the counting relay Der 2.8 is switched off through a normally closed contact of the relay Ld xr from the contact of the counting relay Der 3.9 and via a normally open contact of the relay Ld xr and the contact K of R 5 connected to the relays RSer and RTer . This means that after two relay pairs have been energized, the normally open contact of the relay Osr is already connected to the relays RSer and RTer , so that the basic circuit is interrupted after the third step of the camshaft. The free selection of the second group selector is now controlled in the usual way in the positions 6 "J ₄ and 7 ^:! / ₄ , and if a free third group selector has been assigned and R 4 has recorded the third digit, the control switch R 5 switched to the position 10 Y ₄ ", where the third selection takes place and where the camshaft, not shown, of the third group selector is to be set according to the received second digit. The second digit will now be

added by the third set of counting relays, and therefore this set now controls the third choice. The pairing current surge in position 9 of R 5 is suppressed and that in position 9 ⁵ / _{s is} sent out, and if ο has been selected as the second digit, all relays are de-energized in the manner already explained in the description of the second selection of a special operating connection. Reference is therefore made to Table 5 to explain this choice.

However, before the conversion and selection according to Table 5 can be carried out, the auxiliary memory must be shown how many digits it has to transmit before it switches on the time switch TA (Fig. 5). It depends on the second digit recorded. The control switch R 5 is stopped thus in position 8 _^3/4, are executed zr to this display by the relay Di xr and Di, whose operating contacts, depending on the size of the dialed digit earth to one of the contacts 1, 2 ... 0 is switched on. One of the relays Di 1 r and Di zr is dependent on the relay Fyt via a normally closed contact of the relay Irr and a normally open contact of the relay Ld xr in the positions 9 "/ 4-17 of R 4, ie after receiving the second digit, for Depending on the size of the second recorded digit, earth is connected to one of the three contacts 4 Z), 5 Z) or 6 D , and after this earth a relay in the auxiliary memory responds, as described below responds, the auxiliary memory applies earth via a switching arm of the switch-on selector ARF to the contact F of the control switch R 5. After this earth, the relay Irr responds, which holds and switches off the earth for the relays Di xr and Di zr , so that the are free for other purposes from this point onwards connected to the contacts 4 Z), 5 Z) and 6 D. Furthermore, the relay Irr switches the test contact in the contact bank of the switch-on selector and the starting circuit from the battery on the working con clock from Ld 4r . However, the battery remains connected to the switch selector's holding switch arm via the high resistance. Finally the relay Irr closes the circuit for the control switch R 5 in position 7 ^{: i} / ₄ , which was interrupted at a normally closed contact of the relay Ld ^ r , so that the conversion and selection according to Table 5 can now follow. The free choice of the third group selector for long-distance connections is in the positions 11 '/., And 12 Y ₂ from Z? 5 controlled, and if a free connection line has been seized, the control switch Z? 5 independent of the control switch Z? 4 is advanced from the 12 V ₂ position via a ground connected to a normally open contact of the relay Ld xr. It should be mentioned that the control switch Zi 5 _{could not leave position 7 "7 4} until the control switch Z? 4 had reached position 12 and thereby indicated that the third digit had been recorded. Shortly before reaching position 13 Va the control switch Z? 5 brings the relay Ld ^ r to respond via the contact M and a working contact of the relay Ldr , and this relay switches the basic circuit to the auxiliary storage on a working contact of the relay RTer, via which the control switch Z? 5 is switched on, is now brought into dependence on the auxiliary memory when the relay Ld $ r responds.

It will now be described how the various received digits in the counting relay sets of the auxiliary memory. It should be noted, however, that the control switch of the Auxiliary memory does not remain in position 2 until all these digits have been recorded, but the switching operations 85 · to be carried out by it take place simultaneously with the receipt of the digits.

The first digit to be stored in the auxiliary memory is sent from the normally closed contact of Isr (Fig. 2) via a normally open contact of the relay Ld zr to the switching arm f of the switch-on selector ARF . The incoming current surges cause the relay Lm xr (Fig. 5) to respond, which is connected to the switching arm f , and they are activated via the normally closed contacts of the relays F 8r, F Jr, F 6r, F $ r, F 4r, F 3r (shown in Fig. 4) are sent to the set of counting relays Icr and Jcr (Fig. 4) in exactly the same manner as described for main memory. ioo

When the series of current impulses forming the first digit has ended, the relay Lm xr drops out, and via its normally closed contact, a normally open contact of one of the relays Lcr and a normally closed contact of the relay F ^ r it closes a circuit for this latter relay, which responds and overcomes holds a normally open contact which is closed before the mentioned normally closed contact is opened. When it responds, the relay F $ r switches the receiving circuit no from the switching arm f of the switch- on selector and from the relays Icr and Jcr to the next set of counting relays Kcr and Lcr . The second digit is now stored in this relay set, and at the end of this digit the relay Lm xr closes a circuit prepared for the relay F 47- when it is again de-energized. The relay F ^ r responds and holds in the same way as the relay F ^ r. When it responds, F ^ r switches the receiving circuit to the next set of counting relays Mcr and Ncr , and in the

In the manner already described, each subsequent digit is stored in the next set of counting relays depending on the relays F 4? · to JP 8 r.

From the above it can be seen that the receipt of digits is carried out completely independently of the control switch R 6, and while the various digits are received, the following happens: As already described above, earth is at one of the contacts 4 D, 5 D or 6 D (Fig. 3) of the main memory are switched on, which correspond to the switching arms g, h and b of the switch-on selector ARF. Either the relay D \ r or D $ r or D 6r is activated via this earth. Since it is assumed that the main subscriber number consists of four digits, the switching operations are first described under the assumption that earth is applied to the switching arm g of the switch-on selector. Relay D 4 / responds via this earth via contact T (Fig. 5) of control switch R 6. D /\.r is held via contact T after contact K of R 6 and prepares a circuit for switching control switch R 6 from position 2. This circuit is only closed, however, when the rush-current switch unit RD (Fig. 5) belonging to the auxiliary storage unit is in position 18 or 1. If this switching mechanism should not be in the rest position for any reason, the control switch R 6 remains in position 2, and earth is applied from the upper left contact M of R 6 to the upper left contact B of the switching mechanism RD via break contacts of Car and Cbr , whereby this, immediately after it reaches the position 18, in the position 1 ge. is switched. After it has been checked in this way whether the switching mechanism RD is in the rest position, the upper left contact C of RD via a normally open contact of the relay D ^ r, the lower left contact H of R 6 and the upper left contact / of R 6 earth is applied to the clutch magnet R 6, whereby the control switch R 6 is switched from position 2 to position 4.

Immediately after leaving position 2, the test switch is switched off at the lower left contact D of R 6, so that from this point in time the connection of the auxiliary memory is only maintained via switch arm c. Furthermore, during the transition from position 2 to 3, the earth via which the relay Brr is held is switched on via its own normally open contact, independently of the relay Shr via the upper right contact of R 6. In position 3, the relay Rhr is connected in parallel with the test relay Rtr via the contact D and a working contact of Bn to the shifting c so that this relay is now responsive and its normally open contact, a normally open contact of Brr and the lower left contact F of R 6 can prepare the holding circuit for the relay Brr. 6g After leaving the position 2 _^3/4 to test relay is turned off, and when the right upper contact F of R 6 is opened, as a result of which the holding circuit only in response to the relay Rhr which is kept energized from the main memory, is closed. When the position 3 ^x / _a is passed, earth is now applied to the switching arm α of the switch-on selector ARF , via which the relay Irr (Fig. 3) of the main storage unit responds. This earth is connected in the following way: earth at the upper left contact C of the switching mechanism RD, working contact of D 47%, lower left contact H of the control switch R 6, lower left contact I of R 6, working contact from Brr to switching arm a. As already mentioned, the response of the relay Irr has the consequence that the potential applied to the switching arms i and c of the switch-on selector via the parallel resistors is switched off and replaced by a potential which is applied to the switching arm c alone via a single high resistance . The relay Rhr is dimensioned so that it can stay in series with this high resistance, while the test switch arm is now completely isolated. Another consequence of the response of the relay Irr is that the earth is switched off by the switching arm g.

The control switch R 6 now remains in position 4 until the main memory has finished selecting the transformer (Fig. 6) of the connection line to the remote network and has switched through the basic circuit from the transformer to the switching arms g and h. It can be seen that the switching arm g is assigned to the 23-wire of the basic circuit and the switching arm h is assigned to the .4-wire of the basic circuit.

In position 4, earth is now connected to the switching arm h via the relatively low-resistance winding of the relay Aar and the contact U of the control switch R 6. The relay Sp xr in the transformer (Fig. 6) is activated via this earth. This circuit runs as follows: earth, winding Aar, lower left and upper right contact U of R 6, innermost right contact of relay ear, switching arm h of ARF (Fig. 4), extreme right working contact of relay Ld ^ r , Switching arm f from RF, right lower and upper contact O from R 1, switching arm / of the first group selector, the corresponding switching arms of the second and third group selector, upper break contact from Itr (Fig. 6), transformer winding, winding Sf xr, battery. In the auxiliary storage, the relay Aar addresses this circuit via iao and switches the control switch R from position 4 via a current

circle away, which runs from earth at contact K of R 6 via the upper right contact L of R 6, the right working contact of Aar and the winding R 6 to the battery. The control switch 72 6 runs to position 8. In the transmitter, the relay Sf xr responds, which again excites the relay Tb xr , which is connected to the C wire with a high-resistance winding, so that it remains unchanged as long as earth

ίο is applied to the C wire by the third group selector. Furthermore, the relay Tgr applies earth from its right working contact via the normally closed contacts of the relays C 6r and C zr to the winding of the relay Str , which responds and connects the AC relay Ac xr to the A and ß wires of the connecting line.

As soon as the selector or the memory at the other end of the connection line has been connected to the connection line TL and is ready to receive the current impulses of the desired subscriber number, it indicates this to the transmitter at the outgoing end of the connection line by sending out an alternating current impulse. This alternating current surge triggers the relay Ac ir (Fig. 6), which in turn energizes the relay Lb xr . The relay Lh 1 r brings the relay via the normally closed contacts of C 4-r, C ^ r and C zr

3c C ι r to respond, and when the alternating current impulse sent by the remote office has ended, when relays Ac xr and Lb 1 r drop, relay C xr is connected in series with Γ 2 j-via the following circuit: battery, winding C 1 r, winding C zr, normally open contact from C tr, normally closed contact from Owr, normally open contact from Tgr, earth. When C zr responds at the end of the alternating current surge, it performs the following switching operations: First, a break contact interrupts the circuit for Str, which then drops. Furthermore, it causes the relay I tr to respond via a normally open contact, which then connects the surge relay Tir in series with the differential relay Owr with the A and B wires of the basic circuit to the memory. The surge relay Tir (Fig. 6) controls the transmission of alternating current surges to the remote network. The relay Tir has two windings which are connected in such a way that the winding on the A wire of the basic circuit is connected to earth and the winding on the S wire of the basic circuit is connected to the battery. As soon as the current surge relay is switched on, earth is applied to the A wire of the basic circuit, which activates the high-resistance Abr relay (Fig. 5) of the auxiliary storage unit via the switch arm h of the switch-on selector and the lower right contact U of the control switch R 6. The resistance of the relay Abr is chosen so that the impulse relay in the transformer in series with it does not respond. But as soon as the identification has been received from the auxiliary memory in this way that the transmitter is prepared to transmit the digits of the desired subscriber number to the remote office, the control switch is advanced from position 8 by responding to the relay Car via the following circuit: Battery , Winding of Car, working contacts of Abr and Brr, switching arm α of the switch-on selector ARF to earth at contact F of the control switch R 5 (Fig. 3) of the main memory, which is in position 13 ¹ Z ₂ . The control switch R6 is switched from position 8 via a working contact of Car , and the relay Car is held via its own working contact and the lower right contact / of the control switch R 6 to earth at contact F of R 5 in the manner described above.

As soon as the basic circuit in the memory is closed, the relay Tir applies the relay Ac ir to the alternating current source when it is triggered. The relay Ac xr responds and in turn causes the relay Lb χ r to respond. This latter relay again excites the relay C ^ r via a make contact of C zr , and as soon as C $ r is excited, this relay makes its excitation circuit running via the make contact of Lb 1 r independent of C zr via a drag contact. Furthermore, the relay C $ r causes the relay Oc xr to respond via its outermost right working contact and a working contact of C zr. The relay Oc xr then puts the connection line back to the alternating current source, which is switched off at the normally closed contact of Tir.

When the control switch R 6 reaches position 9, depending on the relay set Ger and Her (Fig. 3) of the main memory, the first digit is transferred to the remote network. This is done in the following way:

In position 9, the upper left contact M of R 6 closes a circuit to contact B of the switching mechanism RD via a normally open contact of the relay Car. The rear derailleur RD leaves position 1 and makes one revolution until it reaches position 18, where it stops. During the transition from position 1 to 18, the switching mechanism RD carries out the following two switching processes via its impulse drum LD. First, when the control switch R 6 8 _^3/4 reaches the position over the right lower and left lower contact Y of the control switch R 6 after the voltage applied to the surge drum LD earth a circuit for the relay Os xr closed. A second earth, via which the relay Os xr is excited, is supplied by the normally closed contact of the relay RScr of the main memory (Fig. 2) via the lower right contact Y and the switching

arm e of the switch-on selector ARF switched on. If the surge drum ID now the switching arm, the relay Os xr is excited about the switches off, this relay is as long as the earth at rest contact of the relay RSCR remains on, but not upset. However, from the moment when the relay BScr responds, the relay Os xr is de-energized every time a current surge is given by the current surge drum ID ίο. When the relay Os xr is excited in position 8 ³ Z ₄ , it closes a loop over the A and S wires of the basic circuit via its normally open contact and a balancing resistor, via which the surge relay Tir in the transformer is excited in the manner already described. It is obvious that the rush relay Tir now drops out every time the relay Os xr opens its normally open contact, and thereby gives an alternating current surge via its normally closed contact via the connecting line to the remote network.

Relay Tir, on the other hand, does not open its normally open contact long enough during the current impulse to cause relay Ac ir to drop relay Lb xr , so that the latter relay during the time during which the various digits are transmitted to the remote office stay aroused. Because the relay Lb xr remains energized via its normally open contact, the relay C 4? ' prevented from responding because it is short-circuited by earth at the normally open contact of Lb xr.

It can be seen that the number of impulses which are given in this way via the connecting line depends on the time during which the relay RScr of the main memory is energized. The relay RScr is connected in position 13 ¹ ^ ₂ of R 5 via the normally closed contact of RTer to the normally open contact of Hyr in the main memory. The relay set Ger and forth of the main memory is in position 13 ¹ Z ₂ R 5 via a contact of the relay Ld $ r to the shifting arm b of Anschaltwählers ARF, and said surge drum ID available at each of their executed step a rush current of this relay set . A number of relays of the relay set Gcr-Hcr corresponding to the first digit of the main subscriber number has been energized, and when the rush drum has carried out a number of steps corresponding to the complementary number of this number, the relay RScr of the main memory is energized, so that from this point on the short circuit across the break contact of RScr, which made the number current impulses ineffective, is canceled, which is equal to the number of current impulses sent by the subscriber when dialing the first digit of the desired subscriber number.

It should be mentioned that the relay RTer responds after the end of the current impulse in series with the relay RScr , and by opening its left normally closed contact it switches off the impulse drum ID from the selectors of the relays RScr and RTcr . The relay RTcr , however, cannot switch the control switch R 5 further from position 13 ¹ ^ when it responds, since the contact via which this is done is connected to the switching arm d and to the switching arm via a changeover contact of the relay Ld $ r d is only connected to earth via contact 5 of control switch R 6 when switching mechanism RD reaches position 18, ie after the transmission of the first digit has ended. This earth is applied through the upper right contact C of the switching mechanism RD , and as soon as this happens, the control switch R 5 is advanced from the position 13 ¹ J ₂ via the normally open contact of RTcr. The earth at the top left contact F of the control switch R 5, via which the relay Car is held via the switching arm α , is switched off, so that the relay Car drops out and thereby switches the control switch R 6 from position 9 to 10 and the further switching of the Rear derailleur RD from position 18 to ι allows. The auxiliary memory now remains in position 10 until the second digit of the desired subscriber number is set on the relay set Acr and Bcr of the main memory. This is indicated by the fact that the control switch R 5 reaches the position 16, whereby earth is applied to the switching arm α of the switch-on selector ARF via the contact F of the control switch R 5. The relay Car responds to this earth via the following circuit: Battery, winding from Car, normally closed contacts from HIr, right upper and left lower contact I from 22 6, normally open contact from Bn to switching arm a. When the relay Car responds, the control switch R 6 is switched to position 11 and, at the same time, the surge drum is switched from position 1. The excitation circuit of the relay Car is interrupted at the top right contact J of R 6. However, the relay Car is held via its normally open contact and the lower left contact / from R 6 to the same earth on the switching arm α .

Since the control switch R 5 is now in position 16, the switching arm δ of the switch-on selector ARF is now connected to the relay set Acr and Bcr , so that the relay RScr, after the impulse drum ID has a number of steps corresponding to the number of the number stored on this relay set has carried out, responds and the earth of the switching arm e of the switch-on selector ARF, through which the number current impulses given by the rush drum were made ineffective.

den, switches off and causes the current impulse relay Tir (Fig. 6) to be made to drop according to the number selected by the subscriber. In this way, the second digit is sent to the remote network, and when the surge drum reaches the position i8, it switches back to earth to the switching arm d of the Anto switch selector via the upper right contact C of RD and the contact S of R 6. The latter then switches the control switch R 6 from the i6 position via the normally open contacts of the relays Ld $ r and Ter of the main memory. Because the earth at contact F of R 5 is switched off after leaving position 16, the relay Car is switched off and the control switch R 6 is brought to position 12.

When the relay Car drops out, it switches earth from the lower left contact M of R 6 to the switching arm α via a break contact from Car . Apart from this earth another earth earth α on the switching arm is independent of the rest contact of a car connected via the right lower contact M of R 6 in the positions 11 _^3/4 -i8 so that when the relay car falls at position 12, not is switched off. It can be seen that this earth serves to keep the connecting circuit (Fig. 1) in the switching position to the basic circuit in dependence on the auxiliary memory. It is therefore only possible to switch the connecting circuit to the speaking position by switching off this earth.

The transmission of the next digit, which is to be transmitted to the remote network, is controlled by the relay set lcr and Jcr (Fig. 4) of the auxiliary memory. This is done in the position τζ of the control switch R 6 in the following way: When the third digit of the desired subscriber number has been received, the relay F y is energized. As soon as the surge drum ID returns to position 1 after the second digit has been completed, earth is connected to the lower right contact C of RD via a normally open contact of the relay F 3 /, the upper right contact G of R 6, the upper right contact / of R 6 and the normally closed contact of HIr are applied to the relay Car , which energizes it. The relay Os ir, which is excited via the lower left contact Y from R 6 to earth on the selector arm of the surge drum ID , is now also connected to earth at the upper left contact K of R 6 via a break contact of the relay Ucr. The relay Ucr is connected in position 12 via the contacts N and O of R 6 to the normally open contact of the relay lcr 6, and it responds to the eleventh current impulse that is picked up by this relay set.

If, therefore, the relay Car advances the switching mechanism RD again from position 1 when it responds, this switching mechanism carries out a number of steps which have no effect on the relay Os ir , since it is kept energized to earth via the normally closed contact Ucr. At the same time, however, the surge drum sends through its switching arm O via the contacts R and Q of R 6 current surges to the relay set lcr-Jcr and thereby causes the setting of this relay set in a manner similar to the reception of current surges sent by the subscriber. When the rush drum has carried out a number of steps corresponding to the complementary number of the selected digit, earth is applied via lcr 6 and the contacts O and N of R 6 to the relay Ucr , which responds and is held via contact K , so that the relay Osr drops from this moment on with each current impulse which is still given by the impulse drum ID . It is evident that the number of number current impulses sent out in this way is equal to the number of current impulses sent out by the calling subscriber by means of his rotary dial.

When the switching mechanism RD reaches position 18, it switches off the earth at the lower right contact C of RD, via which the relay Car was energized, and now the following happens: First the switching mechanism RD remains in position 18 because the relay Car the control switch the relay R Cbr had caught through contact S. This relay is held by the upper right contact M of R 6 and interrupts the circuit at a break contact via which the switching mechanism RD is advanced from position 18. When the surge drum reaches the position 18, the relay Car switches the control switch R 6 from position 12 via its normally open contact, contact E and a normally open contact of relay Cbr when it drops. As a result, the relay Cbr drops out when the contact M opens, and the control switch is therefore stopped in position 13. At the same time the circuit for the switching mechanism RD is closed, and this is in position 1, where it is the right. lower contact C closes again and, if the relay-F4r is energized, can connect earth to the relay Car again. The same switching operations then take place as in position 12, with the exception that the number of transmitted current surges is now controlled by the second relay set Kcr and Lcr (Fig. 4) of the auxiliary memory.

In the present case, this number is not sent out immediately, even if it has already been recorded and the relay F 47 has responded. The reason for this is that, as was assumed, the main part

subscriber number consists of four digits, so that the digit to be sent out to the remote network is the last digit of the main subscriber number. The last digit of the main subscriber number is not sent out until a check has been made to ensure that no extension closing digits follow. This is necessary because, if no extension closing digits follow, the last digit, when it is sent, would set the line selector to the desired subscriber line and the subscriber would thereby be called immediately. The check that no extension numbers follow is carried out by the time switch TA (Fig. 5), which is switched on via a working contact of the relay D ^ r as soon as the fourth digit of the main subscriber number has been recorded and closes a contact after a predetermined time . The first final digit must now be dialed within the time after which this contact is closed. When this happens, the timer is triggered by briefly interrupting its circuit and then switched on again, so that it has to completely revolve again before it can close its contact. If a second final digit is dialed, it must follow before this contact is closed. As soon as the timer has closed its contact, a relay is energized, which allows the auxiliary memory to switch the connecting circuit further after the last recorded digit has been transmitted to the remote network.

If now the case is considered that no final digits are dialed, it is obvious that this can only be determined after the timer TA has completed its test and closed its contact, which can take five or ten seconds. Therefore, if the last digit of the main subscriber number was transferred immediately after the control switch was in position 13 or immediately after the fourth digit was dialed by the subscriber, the memory would still have to check whether a final digit follows by means of its timer . The desired subscriber would therefore be called before the memory has finished this test and before the memory can switch the connection circuit (Fig. 1) through to the speech position. In this case, there is the possibility that the call will be answered in the remote office before the memory has been switched off from the connecting circuit of the initiating office and before the connection is switched through from the calling party to the connection line.

To prevent this, the auxiliary memory is designed so that as long as no two final digits have been selected, the last digit received is withheld until the timer has closed its contact. This means that if, as in the present case, only four digits have been recorded, the fourth digit of the desired subscriber is withheld until the timer TA brings the relay Tar to respond by closing its contact. If a final digit is dialed after the main taker number, the fourth digit is sent without delay; on the other hand, the final digit is only sent after the timer has actuated its contact. If, however, two final digits are selected, it is not necessary to wait for the timer to run down, as it is not possible to select any more digits. In this case, all digits are sent out independently of the timer as soon as they arrive. The switching operations described above proceed in the following way: If it is assumed that only the four digits of the desired subscriber number have been dialed without any final digit, the control switch R 6 of the auxiliary memory closes a circuit from the normally closed contact of the relay F when the position 13 is reached $ r, which has not been excited in this case, via the upper right contact V of R 6, a normally open contact of relay D ^ r and a normally closed contact from Tar to relay HIr, which responds and interrupts the circuit through its normally closed contact the relay Car would respond. Since the relay Car can therefore not respond in position 13, it does not close the circuit for the switching mechanism RD , and this does not begin its last cycle, so that the last digit is not transmitted. At the moment when the fourth digit of the main tenant number has been received, a circuit for the clutch magnet of the timer TA has been closed via a normally open contact of relay F ^ r and relay D \ v and normally closed contacts of relays hpr and Tar. When the relay Car is de-energized, the control switch R 6 remains in position 13 until the timer TA energizes the relay Tar by closing its contact. This first disconnects earth from the timer, which is triggered as a result. The relay Tar, on the other hand, remains on the normally open contact of the relay F \ r via the normally open contact to earth. Furthermore, the relay Tar interrupts the circuit via which the relay HIr was energized, so that this relay now closes the circuit for Car when it drops out. The relay car responds and prepares

the transfer of the last digit before. Via a normally open contact, the relay Tar causes the relay Fd τ r to respond, which prepares a holding circuit via the winding of the relay Fd 2 r. The relay Fd 2 r remains short-circuited as long as the break contact of the relay F 5 r is connected to the winding of the relay Fd xr via the contact V, the make contact D ^ r and the make contact Tar . The switching mechanism RD now revolves and sends in a corresponding manner, as described for position 12, a number of number current impulses via the connecting line TL depending on the second relay set Kcr and Lcr (Fig. 4). The relay Cbr is energized again via a normally open contact of the relay Car , and it also remains after the circuit for Car is interrupted when the switching mechanism RD opens the lower right contact C after leaving position 17 ¹ J _2. As a result, a circuit to the control switch R 6 is closed by the normally closed contact of the relay Car via a normally open contact of the relay Cbr, which circuit continues from position 13 to position 14. When leaving position 13, the upper left contact V of R 6, via which the relay Fd xr was energized, is opened, so that the earth, via which Fd 2 r was short-circuited, is switched off and this relay is now in series with Fd xr appeals to. Fd zr causes the relay Air to respond.

When the relay Air responds , earth is applied to the * 4 wire of the basic circuit via the winding of the relay Aar. As a result, a differential relay Owr, which is located in the transformer (Fig. 6) in the basic circuit, responds in series with the relay Aar , since current only flows through the .B wire of the basic circuit, while the A - Wire is interrupted. When it responds , the differential relay Owr switches off the holding earth of the relays C xr and C zr , which drop out, by opening its normally closed contact. At the same time, the relay Tir is kept energized via its winding connected to the .B wire of the basic circuit. The falling relay C zr first interrupts the circuits for the relays Oc xr and Hr. The relay Oc xr disconnects the connection line TL from the normally closed contact of Tir . The relay Hr switches off the relays Tir and Owr from the basic circuit, so that these relays are released. Since the relay Hr drops out with a delay, it closes its normally closed contact only after the relay Oc xr has already opened its normally open contact, so that at this point in time no current surge can be sent over the connecting line via the normally closed contact of Tir. By closing its contacts, the relay I tr connects the relay Sp xr with the .4-wire and the relay Chr with the ß-wire. At the same time, the relay Aar of the auxiliary storage is brought to waste. When it responded , this relay had energized relay Tdr, which remained after contact M , and when Aar drops out, it applies earth to the resistor in series with relay Brr via its normally closed contact and a normally open contact of Tdr. This short-circuits the relay Brr and causes it to drop out. The relay Brr in turn causes the relay Olr to drop out, and when these two relays drop out, all switching arms of the switch-on selector are disconnected and the auxiliary memory is switched off from this moment on. The control switch is then switched to the rest position via the break contact of the relay Brr. It can be seen that the disconnection of the auxiliary memory takes place in this way only after a check has been carried out to determine that the transformer has actually disconnected the surge relay Tir and has connected the connection to the connecting line in the following manner.

Due to the drop in Brr , the earth, which was applied to the switching arm α and via which the connection circuit (Fig. 1) was kept connected to the basic circuit, is switched off, so that the connection circuit is connected to the speech position and the main memory is switched on in the following manner can be triggered.

In the main memory, the control switch R 5 was advanced from position 16 after the digit stored in the first counting relay set of this memory had been transferred. The earth at the lower left contact T of R 5, which controls the connection of the connection circuit to the basic circuit, is then switched off. However, the further switching of the connection circuit was prevented by the earth at the lower right contact C of R 5, which was temporarily switched on in position 16 "' ₄ via a working contact of the relay Ld / \ r , and before this earth is switched off again, the upper right and left lower contact F of R 5 earth of the auxiliary memory switched on, so that the further switching of the connection circuit from this moment on depends on the auxiliary memory, as described above. The control switch R 5 then moves to position 18, where the relay Jar in series is energized with a resistance to the connected via the test switch arm of the memory selector of the connecting circuit earth and the control switch R 5 in the position 18 stops.

As the auxiliary memory, the transmission of the desired subscriber number to the remote When the network ended, it switched to the

56957a

Contact F of the control switch R 5 applied earth, via which the connecting circuit was held in the switched-through position to the basic circuit, in the manner described above. The connecting circuit then moved to position 9 and opened the receiving circuit, so that the relays Isr and Lbr in the main memory fell to waste and the control switch R 4 was moved to position 18. At the same time, the relay Jar was brought to waste by switching off the earth applied to the test switch arm of the connecting circuit, so that the control switch R 5 immediately moves to position 1. When leaving position 17, the control switch R 4 brought all energized auxiliary relays to drop by opening contact L of R 4, and when it reached position 18, its circuit was already prepared by contact R of R 5, so that it was in the position 1 arrived.

If the second dialed digit indicates that the subscriber number in the desired network consists of five digits, earth is applied to contact 5 D (Fig. 3) through the main memory, which is via the switching arm a of the selector ARI and contact C of the control switch R 6 is connected to the relay D ^ r . Instead of the relay D / \ r , the relay D $ r responds and ensures that the timer TA is only activated when the fifth digit has been received, and that the memory controls the reception of the two extension digits one after the other . A brief description of the mode of operation is given below.

The earth for switching the control switch R 6 from position 2 is now applied via a normally open contact of the relay D 5 /, so that the earth temporarily switched on ^{in position 3 1} Z ₂ , which excites the relay Irr (Fig. 3) of the main memory, is only applied after the relay D $ r is energized. The auxiliary memory now remains in position 4 until the main memory switches through the basic circuit in position 13 ¹ Z ₂ of R 5, in which case the relay Aar is energized and the control switch R 6 in the same way as described above, in position 8 is switched. The auxiliary storage unit remains in position 8 until the transformer (Fig. 6) indicates by attaching the current impulse relay Tir to the basic circuit that the voters of the remote office are ready to receive the current impulses. The relay Abr responds to earth on the A wire of the basic circuit in the transformer and brings the relay Car to respond, which is via contact J of R 6 after that of contact F of R 5 in position 13 ¹ Z ₂ to the Switching arm α of the switch-on selector ARF holds applied earth. The relay Cav switches the control switch R 6 to the position 9 and causes the current impulse transmission switching mechanism RD to complete its first rotation. The first digit is then sent in the manner described, depending on the relays Ger and Her (Fig. 3) of the main memory, and when the switching mechanism RD reaches position 18, it allows the control switch R 5 to be switched from position 13 * ., by connecting earth to the normally open contact of Lcr via the switching arm d of the switch-on selector ARF. After leaving position 13 7-2 W ^ d by switching off the earth at contact F of R 5, the relay Car de-energizes, which causes the switching of the control switch R 6 to position 10 and that of the switching mechanism RD to position 1. When R 5 reaches the position 16, the relay Car is energized again and then in position 16 of the control switch R 6, the second digit is sent out in a similar manner. At the end of the second digit, R 6 goes to position 12, and if the third digit of the main subscriber number has been received, it is now transmitted in the manner described above, depending on the relays lcr and Jcr (Fig. 4) of the auxiliary memory. The control switch R 6 then moves to position 13, and it waits here for the relay to respond, which indicates that the fourth digit of the main subscriber number has been received. When this happens, the fourth digit is transmitted to the remote exchange and the control switch R 6 goes to position 14.

If it is assumed that only five digits have been dialed, a circuit for the relay HIr ^{is now closed in position 13 3} , ' ₄ -i4 by a break contact of the relay F 6r , which prevents the relay Car from being in position when it is triggered 14 responds. Hereby HIr stops the transmission of the fifth digit until the timer TA has activated the relay Tar . The time switch TA is switched on from the moment the fifth digit was recorded via a normally open contact of the relays D 5 r and F $ r . If there are no final digits, the relay Tar is energized after the time that the timer needs to close its contact has elapsed, and the fifth digit is then transmitted because the relay HIr drops out and the relay Car responds via the normally closed contact of HIr . Tar had also made the relay Fd xr respond, so that after the fifth digit has been transmitted and the control switch R 6 has been advanced from position 14, the relay Fd 2r is energized by opening the lower right contact W , whereby the Relay Air responds. The Air relay applies earth to the ß-wire of the basic circuit via the winding of the Aar relay,

and this results in the disconnection of the surge relay Tir and the connection of the A and S wires to the connecting line. The Aar relay then prepares a circuit for de-energizing the relay Brr when it drops via its normally closed contact and a normally open contact from Tdr, which had responded via the normally open contact from Aar , which then triggers the auxiliary storage device in the manner already described.

In the same way as described for a main subscriber number consisting of four digits, final digits can be dialed after the fifth digit, whereby the circuit is brought into effect in a similar manner. Only now the relay D $ r ensures that all switching processes are delayed by one position of the control switch R 6, so that one more digit can be sent to the remote office.

When a compound having a six-digit main subscriber number, the relay D is brought 6 r to the response, and this relay controls the memory in a corresponding W ^r else as described for a four-digit number, with the exception that the time switch TA and all switching operations associated therewith to two positions of the control switch R 6 are brought into effect with a delay, so that here only the transmission of a six-digit number is controlled.

In the transformer (Fig. 6) the relay speaks dir in series with the monitoring relay S zr of the connection circuit (Fig. 1), provided that this circuit has reached the speaking position for special operating connections, which is position 9 of R 1. This circuit runs as follows: battery, winding S zr, upper left and right contact P of R i, switching arm and contact / of the first group selector, via the second and third group selector, the lowest contact of Itr, the transformer winding, winding Chr, den innermost right working contact from Sp xr and the innermost lower break contact from Os xr to earth. The relay Chr interrupts the circuit via which Tbr was held after the C-wire and at the same time connects the battery to the C-wire via a resistor. This keeps the test relay in the third group selector energized. This relay is not shown in the drawings. Relay Tbr, on the other hand, drops out and interrupts the circuit by means of which relay Tb xr was kept energized in series with the winding of Tqr.

Tb xr falls; but the relay Tqr is kept energized via its left high-resistance winding after the C-wire. When the relay Tb xr drops out , the earth, which was connected to the winding of Chr via a make contact of Tqr and the make contact of Tb xr , is switched off. This only happens when the relay Sp xr has already been energized via the A wire to earth in the connecting circuit and has applied another earth to the winding of Chr , which is switched on via a break contact of Oc xr , so that the connection from earth to the winding of Chr is now exclusively under the influence of the relay Sp xr . This earth is switched off as soon as the calling subscriber hangs up the receiver, since Sp xr is energized after an earth which is applied in the connection circuit (Fig. 1) ^{depending on the monitoring relay S 1} xr of the calling subscriber.

The relay Str has responded via the normally closed contacts of the relays C zr and C 6r after a normally open contact of Tqr 'as soon as the relays C xr and C zr have dropped out, and Str now reconnects the connecting line to the relay Ac xr. As soon as the called subscriber answers, an alternating current surge is sent from the remote exchange via the connecting line TL , causing the relay Ac xr to respond. This relay causes the relay Lb xr to respond, which via a normally open contact of C ^ r the relay C 5? ' excited. As soon as the alternating current surge has ended, the relays Ac xr and Lbr drop out and, as a result, the relay C 6r can operate in series with C 5r. The relays C 5r and C br perform the following switching operations:

First, the relay C $ r switches off the call sign RT to the calling subscriber. C 6r interrupts the circuit through which Str would be excited, so that this relay drops out and the speech connection is completed. From this moment on, the conversation can begin. Furthermore, C 6r applies earth from the normally open contact of Chr to the time counter MD , so that this device is started at that moment in which the conversation begins and each time the counter of the calling subscriber is to be operated, a battery via a resistor (not shown) in parallel to the battery connected to the resistor shown on the C-wire of the third group selector. The increased potential at the C-wire causes the counter relay (not shown) in the third group selector to respond, and this again transmits a counting current surge to the previous selector, so that finally the counter (not shown) of the calling subscriber is actuated. In a corresponding manner, when the potential of the mentioned resistor is switched off, the subscriber's counter is de-excited again.

At the end of the conversation, the relay Sp xr is switched off by switching off the relay from S xr in the connection current

circle (Fig. ι) brought to the .4-wire created earth to waste. The drop in Sp xr disconnects the earth from the winding of the relay Chr and this causes the monitoring relay S zr in the connecting circuit to drop. The connection circuit is switched beyond the speech position 9 provided for special operating connections. At the same time, the relay Chr switches off the high potential at the C-wire of the third group selector when it drops so that it can be brought out of the speaking position. Furthermore, Chr immediately interrupts the circuit for the counter MD, so that the counting stops from this moment on. Sp xr brings the relay Oc xr to earth at a normally open contact of C $ r to respond via its normally closed contact. Oc Tr then again applies the connecting line TL to the AC power source and sends an alternating current surge over the connecting line of such a duration that the voters at the incoming end of the connecting line are triggered. The time during which Oc Tr is kept energized is determined by the response of the relay Tqr , which keeps the relay C $ r energized. As already stated, the relay Tqr remains energized via its high-resistance winding after the C-wire of the third group selector until the earth is switched off from the C-wire. This only happens when the control switch ( not shown) of this selector has almost reached the rest position, so that the relay Tqr remains energized as long as possible. When it drops out , the relay Tqr earth switches off all relays that are still energized, so that at this moment all relays drop out and the facilities for the next connection are free.

In the switching processes described above, it was assumed that the desired subscriber line was free. In this case, the current impulse, which indicates that the subscriber has reported, is given only once, so that the relay C 6r could respond in series with C $ r. On the other hand, if the desired subscriber is busy, the remote dialers indicate this state to the outgoing end of the connection line by sending out a series of alternating current surges over the connection line, by which the relay Ac xr is energized and de-energized, so that the relay Lb xr keeps his working contact closed. This keeps relay C $ r energized and prevents relay C 6 r from responding. Under these circumstances, a busy signal BT is applied to the calling line via a normally closed contact from C 6r and a normally open contact from C *, r. When receiving this character, the subscriber hangs up the phone. The counter is not switched on because C 6r does not respond. Str is kept energized because its circuit is not interrupted at the normally closed contact of C 6r. The connection line therefore remains connected to the relay Ac xr .

If the calling subscriber hangs up, the release of the connection takes place in the manner described above by the fall of the relay Sp xr.

After the transmitter has been assigned by a third group selector, in at any moment the connection can be prematurely released, which is described below will.

If the premature tripping occurs immediately after the transformer has been occupied by a third group selector, the third group selector is switched through to the basic circuit without the auxiliary memory being connected to the basic circuit, so that there is no earth on the .4-wire. Via the battery potential, which is then temporarily applied to the J3 wire, the relay Chr can respond via the normally open contact of Tbr and a normally closed contact of Ta xr , since Sp xr had not responded. When it responds, the relay Chr first causes the relay Tqr to respond via its left high-resistance winding by applying earth directly from the normally closed contact of the relay C - $ r to this winding. This interrupts the excitation circuit of the relay Tbr, and at the same time the holding circuit for Tbr is opened at the trailing contact of Chr , so that this relay drops out. This switches off the earth from the winding of Chr , so that the relay Chr drops out and switches off the high potential of the C wire of the third group selector. Since Tqr remains energized and Tbr is disconnected from the C-wire, the third group selector can be switched over to the basic circuit via the switch-through position and thereby triggered. Since his control switch disconnects the earth from the C wire, Tqr drops out and the circuit is then in the rest position. It can be seen that no starting rush current is given to the remote office in this way.

In the circumstances mentioned above, the relay Str is energized and the transmitter waits for the indication from the remote network that the facilities at the incoming end of the trunk are ready to receive number surges. Since the relay Sp xr has been energized and de-energized once to deliver the starting current to the remote network, it has made the relays Tb xr and Tqr respond. If a premature tripping now takes place, in the 16-17 V ° ^em current impulse from the main memory to the basic

Circuit given, so that the relays Sp xr and Chr respond in series, since at this moment there is earth on Chr via normally open contacts of Tqr and Tb xr. Chr interrupts the circuit for Tbr, causing Tb xr to drop, which in turn causes Chr to de-energize, since its earth is switched off. This switches off the high potential of the C-wire of the third group selector, and this selector is triggered. At the moment when Tb xr closes its normally closed contact, it causes the relay Oc ir to respond via the following circuit: earth at the normally open contact Tqr, normally closed contacts of Tb ι r and C ^ r, winding Oc ir, battery. Oar now responds and applies the alternating current source to the connection line TL to the remote network until the relay Tqr drops out. This causes the connection on the incoming

ao end is interrupted.

If a premature trip occurs during the time that both the main and auxiliary accumulators are connected to the connection circuit and the outgoing connection line, the relay Lbr (Fig. 2) in the main accumulator will be de-energized and, as a result, the control switch R 4 switched via position 16 to position 18, and all auxiliary relays in the main memory are de-energized by switching off the holding earth after leaving position 17. In this case, the relay Ldr with its auxiliary relays Ld ir, Ld zr, Ld ^ r and Ld ^ r is also de-energized, and this causes the battery on the switching arm c of the switch-on selector ARF, via which the relay Rtr or Rhr of the auxiliary memory is held , switched off. Premature tripping is thus characterized by the dropout of one of these two relays. A trip in position 2 of the control switch R causes the relay Rtr to drop out, which connects earth to the resistor through which the relay Brr is energized, so that the relay Brr is short-circuited and caused to drop out.

If the relay Brr is de-energized once, it cannot be re-energized before reaching the rest position, and it switches the control switch R 6 to the rest position via its normally closed contact. After leaving position 3, the relay Rtr is switched off from the holding circuit, and its function is now carried out by the relay Rhr . If, in this case, a premature trip occurs, the relay Rhr is brought to drop out, and this interrupts the circuit via which the relay Brr held itself via its own normally open contact. The relay drops out and brings about the return to the rest position in the manner described above.

If premature tripping occurs during the transmission of power surges, the relay Oc xr in the transformer is energized, which has connected the transformer to the normally closed contact of the relay Tir . The circuit arrangement is designed in such a way that the relay Tir cannot drop out long enough to be able to bring the triggering device at the incoming end to effect, as long as no premature triggering takes place. Rather, the current surges emitted by its normally closed contact are only so long that the response of the current surge circuit at the incoming end is ensured. If, on the other hand, the connection is triggered prematurely, the basic circuit in the main memory is interrupted, as a result of which the relay Tir constantly falls. The immediate consequence of this is that an alternating current surge is given over the trunk long enough to cause the connection to be triggered at the incoming end. Another consequence of de-energizing relay Tir is that Lb ir drops out and allows relay C ^ r to respond before relays C xr and C zr have been de-energized (this is usually done by Owr responding before C ^ r can address). As a result, a normally open contact of Cxr applies the battery to the winding of relay Chr via a normally open contact of C / \ r and a resistor. Since earth is connected to Chr via working contacts of Tqr and Tb xr , this relay responds, and it brings about the further switching of the third group selector and the final dropout of all relays in the transformer at the outgoing end of the connection line TL in a similar way to how has been described above.

After the transmission of the current surges, the relay I tr has come to a drop, and the triggering is now dependent on the relay Sp xr, which is excited by the connecting circuit via an earth, the shutdown of which is controlled by the monitoring relay of the calling subscriber. The release in this state of the connection takes place in a similar way to the release already described at the end of the call.

Claims (22)

Patent claims: I. Circuit arrangement for automatic and semi-automatic telephone systems, in which the automatic dialers are controlled by a memory which is set up to store a different number of digits, characterized in that ordinary memories (RC) are provided which are intended to receive a number of digits are set up that is smaller than the largest number of digits used in the system, and that one or more auxiliary memories (ARC) are provided, each of which is assigned to a plurality of ordinary memories (RC) and is temporarily interconnected to establish a connection with one of the assigned ordinary memories (RC) when the number of the desired connection characterizing digits exceeds the capacity of the ίο ordinary memory (RC) to accept digits. 2. Circuit arrangement according to claim ι for systems, which several in different Telephone exchange includes telephone exchanges, one or more of which with are equipped with a memory, characterized in that, in addition to the memory, auxiliary memories are provided which are in Can be used when a connection to an exchange located in another network is established, and which one also transmit the number of the desired subscriber to the voters or to the memory of the desired office, so that the connection is established without the intervention of one or more female officers can be. 3. Circuit arrangement according to claim 1, characterized in that the auxiliary memory in cooperation with the memory store subscriber numbers with a different number of digits. 4. Circuit arrangement according to one of the preceding claims, characterized in that that the auxiliary memories are commonly assigned to a plurality of ordinary memories. 5. Circuit arrangement according to claim 1 to 3, characterized in that at part of the main subscriber number of a connection requiring the support of an auxiliary memory is stored in the memory while the remainder is stored in the auxiliary memory. 6. Circuit arrangement according to one of the preceding claims, characterized in that that the auxiliary memory is connected directly to the memory after a digit in the memory has been received, indicating that the connection requires auxiliary storage, so that the calling subscriber has the entire subscriber number without interruption any speed can choose. 7. Circuit arrangement according to claim 6, characterized in that in the memory a relay arrangement is provided, which upon receipt of such a digit by the Storage devices of the memory is operated and the interconnection of the auxiliary memory caused with the real memory. 8. Circuit arrangement according to claim 6 and 7, characterized in that im Memory another relay arrangement is provided, which the selector circuit of switches the memory to the auxiliary memory when all digits to be stored in the memory are received by the latter and have been saved. 9. Circuit arrangement according to one of the preceding claims, characterized in that that switching devices are provided in the memory which, in the case of certain connections (e.g. long-distance connections) come into effect and cause one or more artificial elections, which are not controlled by any digit, for the purpose of connecting through to an outgoing connection line leading to the desired office. 10. Circuit arrangement according to claim 1 to 5, characterized in that the auxiliary memory is the transmission of the main subscriber number caused to the desired office, the digits stored in the memory under the influence of the Memory can be transferred while the transfer of the stored in the auxiliary memory Digits is only controlled by the auxiliary memory. 11. Circuit arrangement according to claim 10, characterized in that im Memory a relay arrangement is provided, which at the end of the voting in responds to the initiating office and switches the basic circuit from the memory to the auxiliary memory, so that this with the transmission of the main subscriber number can begin. 12. Circuit arrangement according to claim 11, characterized in that the Auxiliary storage contains an auxiliary surge transmitter relay and a surge transmitter switchgear, which controls the relay depending on the setting of the auxiliary storage. 13. Circuit arrangement according to claim 12, characterized in that the Auxiliary rush current transmitter relay is also controlled by the memory, namely during the transmission of the digits of the main subscriber number, which are stored in the memory. 14. Circuit arrangement according to claim 12 or 13, characterized in that that a relay is arranged in the memory and in the auxiliary memory, which for each in the digit stored in the memories, the control of the auxiliary surge transmitter relay by the Renders impulse transmission switching device ineffective during a number of steps executed by the switching device, which corresponds to the complementary number of the number. 15. Circuit arrangement according to claim 8 for systems in which the auxiliary memory contains a control switch, characterized in that the receiving circuit is completely independent of the control switch (z. B. R 6). 16. Circuit arrangement according to claim 15, characterized in that the The receiving circuit in the auxiliary memory runs through contacts of a group of relays in series, each of which is individually assigned to a storage unit of the auxiliary memory, after the storage a digit in this unit is excited and switches the receiving circuit to the next unit. 17. Circuit arrangement according to one of the preceding claims, characterized characterized in that switching means are provided in the memory, which at a die Support of the auxiliary memory • need a connection to the auxiliary memory Indicate how many digits the desired subscriber number consists of. 18. Circuit arrangement according to claim 17, characterized in that the memory contains two relay arrangements (Di ir, Di zr) which respond when an introductory digit is received by the memory and a relay of a relay group in the auxiliary memory to respond, which the auxiliary memory according to after receiving the last digit of the desired number. 19. Circuit arrangement according to claim 18, characterized in that the Relay of the relay group closes the circuit of a timer to allow the auxiliary memory to be switched on to delay the receipt of the last digit of the desired number so that the calling party can save this Number can still choose one or more extension digits. 20. Circuit arrangement according to claim 19, characterized in that the Timer is controlled by a relay, which when receiving another Digit responds through the auxiliary memory and triggers the timer. 21. Circuit arrangement according to claim 9, characterized in that an outgoing connection line is provided with a current impulse transmission device is which, under the influence of the auxiliary storage, alternating current surges to the remote Office sends out. 22. Circuit arrangement according to claim 21, characterized in that the Auxiliary memory sends a signal to the transmitter after the last digit has been sent at the outgoing end of the connection line there, thereby creating the impulse transmission device is switched off by the speech wires. For this purpose 2 sheets of drawings