DEI0008058MA - - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

Registration date: December 17, 1953. Advertised on July 19, 1956

GERMAN PATENT OFFICE

The invention relates to a circuit arrangement for telecommunications, in particular telephone telephone systems with main memories, auxiliary memories and converters for establishing connections between different traffic levels.

Storage and conversion devices for telephone systems, which as connecting organs switches, in particular those according to the crossbar principle, use are already known. In the case of telephone dialing systems, which connections allow in different traffic levels, the requirement for the storage of exchange codes occurs in addition to the storage of the phone number of the desired participant. This means an extension of, for example, the local traffic existing storage and conversion facilities. Thus, a memory arrangement is known in which a group of normal memories an auxiliary memory is assigned. To establish a connection within the local network only the normal memory is required, which is just dimensioned so that it can accommodate the number of Digits of the participant's number. When calling a subscriber from another local area network on the other hand is one about the capacity

605'SSO / 170 '

/ 8058 VIIIa / 21a ^s

number of digits to dial beyond normal memory. After choosing an elimination number, which the normal memory takes up, the Auxiliary memory via a search dial to the Normal memory switched on. The following digits are used until the memory capacity is reached recorded in normal memory while the remaining digits are stored in auxiliary memory will. The auxiliary memory is used in

ίο certain cases to increase capacity of normal storage. This arrangement then leads to considerable difficulties when, a Connection between different systems (e.g. decadic and non-decadic) established and the necessary conversions are to be carried out. To avoid these disadvantages, an arrangement is proposed according to the invention in such a way that a calling subscriber after Occupancy of a main memory by dialing an elimination number occupies an auxiliary memory and after receiving a prompt to dial further the destination code and then dials the subscriber number and that the destination exchange code is recorded from the main memory and is transferred directly to the auxiliary memory for storage, the storage the subscriber number, however, takes place in the main memory.

According to a further embodiment of the invention, the target exchange code recorded by the auxiliary memory is evaluated by a converter assigned to the auxiliary memory and transferred to the auxiliary memory returned.

This arrangement has the advantage that the auxiliary memory can only be trained according to the tasks of the remote service what means a simplification especially for conversion processes. In particular, this allows Memory grouping for connections between different systems (decadic and undecadic) and various connection options (cross-connection, code path) and the possible combinations make it easier to carry out the associated conversions in that the target exchange code and the subscriber number are separate and independent can be converted from each other. Another advantage can be seen in the fact that the individual storage elements of the main and auxiliary storage are always assigned the same task, which also helps to simplify the arrangement. Finally offers the separate Storage of destination code and subscriber number. the further advantage that with Extensions to the telephone service, e.g. B. from local to long-distance dialing traffic, the existing ones Memory and converter devices can be adopted without too complex changes can to carry out long-distance traffic for all operating conditions.

The details of the invention are based on exemplary embodiments with the aid of Figures explained. Here shows

Fig. Ι a schematic diagram to 'explain the general switching operations of the system for In the event that the connection is established via a main memory,.

Fig. 2 is a schematic diagram to explain the most important switching operations for the case that for an auxiliary memory is used to establish the connection,

3 shows the various switching elements of a main memory,

Fig-4, 5. 5 A, 6, 6 A and 7 show the circuit of one Main memory,

Fig. 8, 8 A and 9 the circuit of a converter,.,

Figs. 10, 10A and 11, 11A show the circuit of a Auxiliary storage,

Fig. 12 is a basic diagram to explain the connection of a memory to a converter, and

13 shows a connection diagram of FIGS. 4 to 11.

In the following description, the cases will now be examined in which to build a Call connection only a main memory or an auxiliary memory is needed. In the described Embodiment, it is assumed that it is a local or district connection in the first case, in which the main memory is also referred to as "district storage facility", and in the second case it is a national connection, in which the auxiliary storage is also marked as "Landesspeicher".

The basic switching operations of the system will now be described with reference to FIGS. 1 and 2.

In an automatic switchboard is part of the facility intended to receive and store the dialed digits, in order to be able to establish such a connection.

In the following description it is assumed that the automatic switching system is assigned to a number of participants who are divided into groups. A group selection facility selects the group of the called subscriber and a subscriber selection facility searches for the called subscriber in the relevant group.

The case of a local connection will now be dealt with first. If the subscriber Ab (Fig. 1) wants to conduct a call, he picks up his handset and is connected in a known manner to a feed bridge AL 1 after this feed bridge has been connected to a free district storage facility ENR via a searcher CHER.

The district memory ENR then sends the calling party the exchange signal to indicate that the number of the called party can be dialed. This number usually consists of two different parts: i. a prefix that identifies the local office or the group of the other subscriber, 2. the actual subscriber number that identifies the subscriber in the relevant office or group. . · ■

550/170

18058 VIII a / 21a ³

The dialing pulses sent out by the subscriber are received and stored by the district memory ENR.

This memory is then connected to a free converter Ti? Via a converter connector CTR. connected. It is noted that multiple converters can be associated with a number of memories. If no converter is free, the ENR district memory can not use any converter

ίο be connected. The occupancy time of a converter TR is in reality very short. The delay in establishing a connection due to a non-free converter is therefore very small.
The converter receives the selected prefix from the memory. It converts the digits received into coded dialing codes and sends a number of conversions to the ENR district memory. It determines the number of digits to be converted and then the number of prefixes required for group selection. The converter also determines the number of digits that are not to be converted that are sent to the line selection stage. It then sends the district memory ENR an operating code together with all the other codes that are necessary for the entire connection setup to the subscriber, including the meter code, if the latter are needed, and then releases.

It is now assumed that the part-.

From participants will have a conversation to a remote office or at a special service. When this subscriber picks up his handset, he is, as described, connected to a memory to which a converter TR is connected via a converter connector CTR. The converter then sends the district memory ENR conversions which determine the dialing codes which establish the connection via the options SG and SG ' to an outgoing connection line to the called remote office or special service and, in the first case, to the local office of the called subscriber.

"It is now assumed that the calling subscriber belongs to an exchange which is upstream of the relevant local exchange. The call of this subscriber is received via an incoming line, e.g. Igei, which is connected to the incoming connection line JA (Fig. 1). This connecting line JA is connected in a known manner to a feed bridge AL 2 after this, as previously described, has been connected to a memory ENR ' and a converter TR via a searcher CHER' Conversions to the memory ENR ' so that, as previously described, it can set up the connection to the subscriber connected to the relevant office or via an outgoing connection line JD to an outgoing subscriber line Igs 1,

.60 if the called subscriber is in a distant exchange.

. In the following, a land connection will now be described with reference to FIG.

When a subscriber picks up his handset in the exit office, he is connected in a known manner to the district memory ENR , which sends him the official signal. The calling party then dials a special number that identifies a national call. Once the. District memory ENR has received this number, it causes, as described, the occupancy of a converter, which sends it back a company code. As a result, the district storage facility is connected to a regional storage facility ENN via a state storage seeker CHEN. When this connection has been made, a new character is sent to the calling subscriber as a request for further dialing. The subscriber then dials the number of the called subscriber. This number consists of two completely different parts, i.e., like in a district call, a prefix and the actual participant number:

1. The prefix is recorded in the country memory using the CHEN country memory finder;

2. the actual subscriber number is recorded in the memory ENR .

As with a local call, the country memory looks for a free converter, connects to it via a converter connector CTR and sends it the received prefix. The converter then sends the country memory ENN the prefixes and the required company code to establish the connection via an outgoing connection line JD to the local office or the remote control center. of the participant to be able to build up one or more group elective levels SG, SG 'according to the respective circumstances.

When the state memory has sent out the necessary identifier via the district memory, it causes the district memory ENR to transmit the second part of the call number that it previously stored over the outgoing connection line and subscriber line Igs 2.

It can now be the case that the calling subscriber Ab, who wishes to make a national call, belongs to a remote office that is outside his own office.

In this case, the call is received via the connection line YES, which is connected to the subscriber line Ige 2 . The connecting line is connected to the feed bridge AL 2 in a known manner after it has been connected to a district storage facility ENR ' as in the previous case. The calling subscriber then also dials the special number that identifies a national call. The converter occupied by the district memory ENR ' causes the memory to be connected to a country memory ENN via a country memory connector CHEN. The connection is then established as in the previous case.

The following describes the various members of the system and their functions shown.

609,550 / 170

I8058VIIIa / 21a ^s

The district memory ENR consists essentially of three members: a receiver RE, a transmitter EV and a memory ER (Fig. 3). The receiver RE connects the district storage facility ER with the storage facility finder CHER and the feed bridge. It sends the dialing pulses and the class identifier of the calling subscriber (e.g. coin-operated telephone, ordinary subscriber, company subscriber) to the memory ER in the form of coded identifier.

The district memory ER receives the encoded identifiers of the receiver RE and stores them. It also receives the coded dialing codes and operating codes of the converter and stores them.

The transmitter EV is directly connected to the feeder bridge and thus to the entire lower selection level chain.

It sends the coded dialing codes, with which the connection is established, to the local exchange or to a remote exchange up to the called subscriber, if the remote exchange is from the same system as the exit exchange, and to an outgoing connection line, if the remote one Office belongs to a different system. The same transmitter EV thus allows a country call to set up the connection to an outgoing connection line.

The dialing codes received by the receiver RE contain the digits and dialed by the calling subscriber. the class identification of the calling subscriber! The memory occupies a converter as soon as the prefix is saved. After the converter has received the prefix and the class identifier of the calling subscriber, it returns a number of conversions to the memory ER which allow the setting identifiers to be sent out which are necessary for setting up the connection. After this

4.0 characters have been sent out by the transmitter EV , it causes a pick-up chain of the storage relay to start up. If the subscriber wants to make a national call, he selects a special number so that the converter sends out an operating code and controls the occupancy of a national memory ENN (FIG. 2). .

The country memory contains a chain which is connected to the receiver of the district memory ENR in order to store the prefix dialed by the calling subscriber, and also a chain in order to store the coded identifiers sent back by the converter. The tapping chain of the memory ER is controlled by the transmitter EV of the district memory ENR and allows the coded selection and setting codes to be tapped on the basis of the service codes and to be transmitted to the transmitter EV. As has been highlighted, the state memory is occupied by the district memory ER and only stores the prefix of the called subscriber. If this switching process is carried out, the state memory ENN triggers the switching processes in the district memory in order to in the district memory. to save the actual subscriber number of the called subscriber.

The converter is assigned by the state memory in the same way as by the District memory if the first two digits of the country code have been saved.

After returning and converting the first part of the number of the called subscriber, the state memory sends the district memory ER ~ a signal so that the district memory sends out the second part of the stored subscriber number.

In the foregoing it has been assumed that the selected prefix is sufficient to identify the group of to determine the called party or the direction of the remote office.

For reasons relating to the facility or the census, it may happen in a district interview that the: selected prefix is not enough and that it is necessary to add a new digit to the prefix. In this case the converter sends back a special company identification requesting a new digit, to be able to establish the connection. It then breaks the connection with the memory that after the added digit has been saved, is again occupied by a converter. The switching processes go then play out in the manner already described.

If the first two digits of the stored prefixes to establish a connection during a national call are not sufficient, the converter requests two more digits and the switching operations play out in the same way.

A local call will now be described with reference to FIGS. .

In the description that follows, the contacts belonging to the relays or magnets are identified with the same letters or groups of letters as those of the relays or magnets, with a designation 1 to 9. Only small letters are used to designate the contacts mentioned ej.

In some circuits only those parts of the circuits are shown that are necessary for the understanding of the Invention are necessary. So z. B. some relay sets shown connected in a chain are, d. That is, they are arranged in such a way that these relays cannot respond at the same time; the details of these circuits are then not shown.

In some cases, to simplify the drawing,. not all the same links or circuits have been drawn, but only one link or circuit of each type, the number being added in brackets. If it is z. B. there are ten relay trfa in the converter , only one is shown.

In some cases it has also been necessary to point out some relays that are the same Perform functions. These relays are then identified by the same group of letters, provided with a number indicating the rank of

S50 / 17O

I8058VIIIa / 21a ^s

Relay indicates. The contacts are identified with the group of letters of the relevant relay, provided with two digits separated by a slash. Contact fe & 1/5 in connector CTR designates contact no. 5 of the first £ & relay.

When a contact of this relay has a very clear function in the various belonging to it Circuits, such contact is made in the usual way by the letters that make up the individual relays designate, represented, provided with a number, the rank ^ of the relevant Identifies the contact.

Individual members have been separated from the common by dashed lines. The same thing applies to the various common links.

To make the drawing easier to read, is

'It was necessary to group the connecting wires in a cable, especially those that connect two adjacent figures.

It is now assumed that the

Description of the switching elements used are free.

Under these conditions, all 'the relays and magnets, as shown in FIGS. 4 to 9, are in the idle state with the exception of the relay kc of the converter connector and kg of the converter. The relay kc (Fig. 8) is in fact energized through the following circuit: battery, resistor Re8o, normally closed contact kfi / i ... kfn / i, relay kc, earth.

The relay kg (Fig. 8) is excited via the following circuit: battery, resistor Re 81, chain of normally closed contacts ke i / i ... kepli, relay feg ", normally closed contact try ι, earth.,

The! The battery, which is normally used to power the various relays and whose negative pole is represented by an arrow, has its positive pole connected to earth; however, a special low capacity battery is also provided, the negative pole of which is grounded and the positive pole of which is represented by an arrow with a plus sign. In addition, a battery is needed that provides a high voltage for the gas discharge tubes; this battery is indicated by the letters HT together with a plus or minus sign depending on whether d _t he required high voltage is positive or negative. '

As an exemplary embodiment, it is now assumed that the automatic switching system is set up for ten thousand subscribers. These ten thousand participants are divided into twenty groups of five hundred participants each, from which each group is selected by a group selection device SG of a group selection set.

The called subscriber is then selected by a subscriber selection device of a subscriber selection set select.

If, as indicated, a subscriber Ab picks up his handset, he is connected to a feed bridge AL 1 (FIG. 1), which is connected to a free district memory ENR via a memory finder CHER. Under these circumstances the line ν (Fig. 4) is earthed, so that the magnet V of the memory seeker is excited and connects the district memory with its supply bridge by closing its contacts a, b, c, t, a ', b', c ' , .t ' and the contacts vi-v 6.

It should be noted that with this through-connection the subscriber lines α and b of the calling subscriber after the occupancy of the memory by the searcher CHER are not connected to the memory, while the c-wire, which identifies the class of the subscriber in question, with the Storage is connected. This class identifier is then sent to the recipient's particular relays until the subscriber is connected to the memory; this ■ connection causes an interruption of the wire (for the class identification) as explained below. .

Over its make contact ν 2 of the magnetic V for the relay from the following circuit closes, the assignment is made through the viewfinder: Earth in the seeker line t ', contact of the single switch CHER, working contact ν 2, break contact ac 2, relay from, Battery. Relay down is energized. It is emphasized that this relay is energized at the moment in which. the memory is occupied by the searcher and is therefore connected to the calling subscriber rather than this district memory itself for the reason given above.

Via its normally open contact »3, the magnet V closes the circuit for the occupancy relay of the feed bridge of the local office via the i-wire of the searcher CHER and the resistor Rc. Via his working contacts ν4 and ν 5 he prepares the sending out of the combinations for the various electoral levels. Via its normally open contact ν 6, the magnet V prepares a holding circuit via earth and contact from 2, which is closed when the relay is energized from . Via its normally open contact ^: v 1, the magnet V closes the circuit of the c-wire of the viewfinder switch CHER in the receiver RE. This is the circuit for sending the class identifier j.05 to the calling subscriber.

In the receiver RE there are four relays ap, aq, ar, as; two of them, and as aq, are delayed relays and are used to identify the subscriber class (. for example, ordinary partial participants n is _0, pay phone, company subscribers). They respond to very specific changes, as can be seen from the rectifiers Rd 40 and / Rd 4.1 , and to given amplitude values of the relevant half-periods. It is then possible to send eight different signals via the c-wire, which allow one or more relays to be excited for class identification, by utilizing the positive and negative half-cycles of an alternating current of a certain amplitude and different strength and by using a wave current . This wave current is characterized by positive and negative changes of different amplitude.

If F denotes the current amplitude that a delay relay does not respond to, and G

609 560/170

I 8058 VIII a / 21a ³

the amplitude that causes a delay relay to respond is given in the following table Combinations in which the relays are energized for class identification.

It should be noted that, in the case of a wave current, the plus or minus sign in front of the letters F and G indicates the type of change, the magnitude of which is represented by the letter in question.

electricity

positive ....

positive

negative ........

negative

Alternating current ...

Alternating current ...

Wave current ....
Wave current ....

Current amplitude

F. ■ G .F-G

G-F

Energized relays

ap - aq

ar

ar - as

ap - ar

ap - aq - ar - as

ap - ar - as

ap - aq - ar

In order to simplify the following description, it is assumed that the magnitude of the current flowing through the c-wire is large and positive. Under this assumption the following circuit results: positive voltage source in the feed bridge, c-wire, contact belonging to the switch Cher , normally open contact ν τ, normally closed contact ac 3, rectifier Rd 40, upper windings of relays ap and aq, earth; the relays ap and aq are energized in series.

The contacts of the four class identification relays are arranged in a certain way in a coding device CD 1 in order to encode the identification received via the c-wire. This coding device has an incoming wire 409 and three outgoing coding wires A ', B', C. Each of these three wires is equipped with a relay for receiving the coded. Class identifier connected in the memory ER .

About their work contacts dp 2 and 003 close the relay ap and aq their holding circuit to ground through the normally open contact from two of the relay from. These circuits are closed when the relay from being responsive. Has the relay addressed starting, it connects via its normally open from 2 'the following circuits:

i. Holding circuits of the relays ap and aq, as already described;

2. Earth, normally open contact from 2, wire 406, normally closed contact sqs, resistance Re 70, relay jot, battery.

Relay sm is energized.

About his work contact from the relay 3 closes the energizing circuit of the relay ax over his lower winding so that the relay is energized. . ■ ■ '"

Via its normally closed contact, ax 1 - takes. the relay ax the voltage from the Prüfader te away to the respective serving memory to be marked as occupied. For the same reason, it removes earth from the chain core ch with its normally closed contact ax 2. Via its normally open contact ax 3, it prepares the holding circuits required until the triggering.

It is noted that the chains and test wires as well as the wires a, b, c, t, d ', V, c', t 'of the searcher CHER, which contain the control elements of the searcher in question, via the stage CC in the feeder bridge end up.

During these switching processes, which serve to record the class identification of the subscriber, the switching processes for the connection of the subscriber to the district memory ENR take place in the known and previously mentioned manner; the relay aa is excited via the subscriber loop. The official signal is sent over the middle winding of the relay aa via the following circuit: Generator Ge 1 in the memory ER, normally closed contact rpy, wire 400 / capacitor Cd 40, normally closed contact ad 1, middle winding of the relay aa, earth; this creates an induction current in the right and left windings of the relay aa , which reaches the calling subscriber via the following circuit: earth, right winding of the relay aa, ib wire. . ., Subscriber loop. . ., α-wire, left winding of the relay aa, battery.

The calling subscriber from then dials the number of the called subscriber. It is now assumed that the following is a six-digit system; the "digits are designated by the letters P, Q, M, C, D, U. The first two digits should represent a prefix and identify the local office or the group of the called subscriber; the digits in question can, for example, consist of a The last four digits are used to identify the called subscriber in his local office. It is assumed that the calling subscriber dials the number M 2-25-70.

When the subscriber dials, the subscriber loop is interrupted and the relay aa pulses.

In the receiver RE , the pulses are received by the relay ag, am . The contacts of these relays form a coding device CD 2, which has an incoming wire 411 and four outgoing no wires A, B, C, D , which lead to corresponding relays in the memory ER in order to store the relevant coded identifier.

When the relay aa has picked up, the following circuit is closed via its normally open contact aai: battery, resistor Re43, normally open contact ααΐ, relay ac, earth, with the control relay ac being energized. This is a delayed relay and is therefore held during the series of pulses.

After the relay ac has responded, it closes a holding circuit for the relay via its normally open contact ac 1. It opens the initial excitation circuit of the relay via »a normally closed contact ac 2 . Via its normally closed contact ac 3, it opens the excitation circuits of the relays for class identification ap. · -. . as that

609S50 / 17O

I 8058 VIII al21a ³

keep as described. It applies the common holding earth of the memory ER via its normally open contact ac 5. Via its normally open contact ac 4, the relay ac applies the common holding earth of the receiver and transmitter and grounds the incoming wire 409 of the coding device CD ι of the class relay contacts, whereby the coding. the class identifier received via the c-core is possible.

As already emphasized, the relays ap and aq are excited and close their working contacts api, aqi and ag2 in the coding device CD 1. This closes the following circuits:

i. Earth, normally open contact ac 4, wire 409, normally closed contact απ, normally open contact ag 2, wire Ä, which leads into the cable 402 of the memory ER to the relay eea , battery;
2. Circuit already described, working con-

ao takt ag i, wire B ', cable 402, relay eeb im

Memory ER, battery.

The relays eea and eeb respond and have saved the class identification. These relays close their working contacts eea 1 and eeb 2 and thus close their own holding circuit to the common ground of the memory via the working contact ac s.

After the subscriber has received the dialing code from the memory, he dials the first Digit of the number of the called subscriber, d. H.

the letter M, which corresponds to six pulses.

At the first elicited

Loop interruption drops relay aa after its excitation circuit has been opened. About his break contact aa 1 it closes the relay ac short, which does not fall due to its drop-out delay, and its operating contact aa ι lifts it to short-circuit the relay ad on which is energized via the following circuit: earth, peace Contact aa 1, ac working contact 6, relay ad, resistor Re ^, battery. It is noted that the relay ad is energized with each series of pulses. In fact, every suit of the. Pulse relay aa the relay ad is short-circuited via the working I contact aa 1, but the drop-out delay is too great compared to the sequence of the series of pulses, so that the relay ad is maintained for the duration of the series of pulses.

When the relay ad has responded, its normally closed contact ad 1 interrupts the circuit for the transmission of the official signal to the calling subscriber. Via its normally open contact ad 4, it applies the common ground potential of the receiver via ac4 to the receiving relay ag, am and to the relay ae. The following circuit is closed for the latter relay: earth, normally open contacts ac 4 and ad 4, relay ae, resistor Re 44, battery, so that relay ae is energized.

If the relay ae ^{1 has} responded, it maintains itself via the normally open contact ae 1 and also applies ground potential to the receiving relay ag, am. With its working contact ae 2, it prepares the application of ground potential of the contact ac4 to the coding device CD 2 of the receiving relay contacts; this. Circuit is closed when the relay ad drops out.

If the relay aa has dropped out, it closes the following circuit via its break contact aa 3: earth, make contacts ac 4 and ad 4, break contacts ru4, αα3 and ah τ, right winding of the differential relay ag, battery, whereby the relay ag is energized.

When the relay ag has responded, it closes its own holding circuit via its working contact ag · 2 via earth and Re 46. Via its working contact ag "3, it prepares the switching on of its second winding. Via its working contact ag · 4, it prepares the excitation circuit of the Relay ah before. At the end of the first loop interruption, ie at the end of the first pulse, relay aa is energized again. '■' ■

The relay aa reconnects the relay ac to the battery via its normally open contact aa 1. It is noted that the drop-out delay relay ac cannot drop out during this time. This means that the relay ac remains energized for the duration of the 'pulse series, while the relay' ad short-circuited by the normally open contact aa 1 receives a drop-out delay, but drops out after each pulse series. Via its working contact αα2, the relay aa closes the excitation circuit of the relay afc, which is energized, to the earth of the contact ac 4.

If relay ah has responded, it closes the following circuit via its make contact ah 5: earth of make contact ac 4, make contact ad 4, wire 410, make contact ah 5, break contact aj 3, right winding of differential relay ai, which is excited.

When relay ai has responded, it uses its normally open contact ai 1 to prepare its own holding circuit via the right-hand winding of relay aj . This circuit will be closed when ah is no longer aroused. The relay ai prepares the switching on of its left winding via its normally open contact ai2.

After the end of the first pulse, the receiving relays ag, ah and ai are therefore energized in the receiver. .

The relay aa drops out at the beginning of the second pulse.

If the relay aa has dropped out, it closes the following circuit via its break contact aa 3: earth via known circuit, wire 410, break contacts * 4 and αα3, make contacts ah 1 and ag 3, left winding of the differential relay ag, battery. Since the fluxes in the two windings of the relay ag are the same and opposite, the relay is neutralized and drops out. In parallel with this circuit, the normally closed contact aa 3 closes a holding circuit for the relay ah via the rectifier Rd 42 and resistor Re 47. This holding is necessary because by the. Drop of the relays aa and ag · the excitation circuit of the relay ah is opened by αα2 and ag 4.

■ 609 56OiI

J 8058 VIII a / 21a ³

At the end of the second pulse, the relay aa is excited again and opens the holding circuit of the relay ah, which drops out , via its break contact aa 3.

After relay ah has dropped out, it cancels the short circuit of the right winding of relay aj via its normally open contact ah 5, so that this relay is excited via the right winding of relay ai.

If relay aj has responded, it closes the following circuit via its normally open contact aj 4: earth on wire 410, normally open contact α / 4, normally closed contact α 2, right winding of the differential relay ak , battery, which energizes relay ak.

After Relais'afc has been energized, it prepares its own holding circuit via its normally open contact ak 1 via the right winding of the relay al . This relay does not respond, however, because the relevant winding is affected by the contact

ao aJ4 is short-circuited. The relay ak prepares the switching on of its second winding via its normally open contact ak 2. .

The reception of the second pulse is therefore characterized by the excitation of the relays ai, ak and aj in the receiver RE .

Relay aa drops out again at the beginning of the third pulse. If the relay ah is in the rest position again, as already mentioned, the energizing circuit of the relay ag is closed via its right winding and the normally closed contacts aa 3 and ah τ when the relay aa drops out.

If relay ag has responded, it closes its own holding circuit via its working contact ag 2 via its right-hand winding. It prepares the switching on of its left winding via its normally open contact ag 3. Via its normally open contact ag · 4, it again prepares the re-excitation of the relay ah .

Relay aa is re-energized at the end of the third pulse. Via its working contact aa2 and the working contact ag 4 of the energized relay ag , it closes the excitation circuit of the relay ah which is energized. Relay ah closes the following circuit via its make contact ah 5: earth on wire 410, make contacts ah 5, α / 3 and ai2, left winding of differential relay ai, battery. The neutralized relay ai drops out. In parallel with that

. the previous circuit, the contact ah 5 closes the following holding circuit for the relay aj:

Earth on wire 410, working contacts ah 5, ώ; 3 and aj 5, left winding of relay aj, battery.

The reception of the third pulse is therefore characterized by the excitation of the relays ag, ak, ah and aj in the receiver RE .

The relay aa drops out again at the beginning of the fourth pulse. Via its normally closed contact aa 3, it causes the differential relay ag to drop in a known manner.

At the end of the fourth pulse the relay aa responds again and opens via its normally closed contact aa ?, as at the end of the second pulse the holding circuit of the relay ah, which drops out. If relay afc has dropped out, it opens the holding circuit of relay aj via its normally open contact ah 5, which drops out again. ''65

After the normally open contact α / 4 has opened, the relay α / removes the short circuit of the right winding of the relay al , which is thereby excited.

If the relay has responded al , it prepares its own holding circuit via its working contacts al 2 and al 4 and its left winding.

The reception of the fourth pulse is therefore characterized in the receiver RE by the excitation of the relays ak and al .

■ Relay aa drops out again when the fifth pulse starts. Via its normally closed contact αα3 it causes the relay ag to be excited in the manner described.

If the relay ag has picked up, it prepares the excitation of the relay ah again in a known manner *.

The relay aa is excited again at the end of the fifth pulse and closes the excitation circuit of the relay ah, which picks up, via its normally open contact α-α-2.

After relay ah has responded, it closes the excitation circuit of the differential relay ai via its working contact ah 5 via its right-hand winding and prepares its own holding circuit via its working contact ah 1. Nothing has changed for the relays ak and al , so they remain excited.

The reception of the fifth pulse is therefore characterized by the excitation of the relays ag, ah, ai, ak and al in the receiver RE .

The relay aa drops again at the beginning of the sixth pulse * and causes the relay ag to drop in a known manner.

After relay ag has dropped out, it closes the following circuit via its normally closed contact ag 1: Earth on wire 410, normally closed contact agT, normally open contacts ai 3 and al 5, relay. am, battery, which energizes relay am .

Relay aa is re-energized at the end of the sixth pulse. If the relay aa has responded, it opens the holding circuit of the relay ah, which drops out, via its normally closed contact aa 3. When the a / i relay drops, it cancels the short circuit of the right winding of relay aj , which picks up

If relay aj has responded, it closes the following circuit: earth on wire 410, normally open contact a / 4, al 2 and akv, left winding of relay ak, battery ,. The differential relay ak neutralized in this way drops out.

As shown, the relay has picked up on . Via its normally open contact on 5, it has closed a holding circuit via the common earth of contact ac 4 and resistor Re 48.

The reception of the sixth pulse is therefore characterized by the excitation of the relays ai, aj, al and am in the receiver RE .

The reception of the first digit (M) is now complete.

The relay ad, which has been short-circuited by the normally open contact aa 1 of the relay aa, drops out,

550/170 '

18058 VIII a / 21a ³

before the impulses of the second digit are sent out.

Via its normally closed contact ad 4, the relay ad, after it has dropped out, shorts the relay ae , which drops out with a delay and so the ground potential via its normally open contact ae 1 to the receiving relay excited at the end of the first series of pulses and via the normally closed contact αα "2 and Normally open contact ae 2 on the incoming wire 411 of the coding device CD 2 still holds. This closes the following circuits:

1. Earth, make contact ac 4, wire 409, make contact ae2, break contact ad2, wire 411,

_t 'normally closed contact ah 2, normally open contact on 1, wire A,

■ J £ abel4Oi, wires in the memory ER, idle tone contact rp 2, relay epa, battery;

2. Jirde,. . ., Normally open contact on 4, wire D, cable

401, wire D, normally closed contact rp 5, relay epd, battery.

The relays epa and epd are energized in the memory and identify the first digit (P) of the prefix of the subscriber called by the subscriber from.

After these two relays have responded , they close their working contacts epa 1 and epd 4 and thus prepare their own holding circuit via the common earth of contact ac 5 of the memory and the left winding of the relay rp .

This holding circuit, which is at the same time rp of the exciter circuit of the relay is turned on when the relay is energized ae and so the short circuit of the relay rp over its make contact ae 2 picks.

The relay ae, which, as already mentioned, has a drop-out delay, now drops out. Via its normally open contact ae ι it takes the earth from the receiving relays ai, aj, al and am, which are still occupied after the first series of pulses of the first digit has been registered in the memory. The relay removes the earth from the incoming wire 411 of the coding device c J) 2 via its normally open contact ae 2 , so that the relay rp can be excited and the relays that store the first digit can also hold.

(By energizing relay rp (Fig. 5A) the end of the storage of the number P is displayed. It includes a separate holding circuit via its normally open rp 1. Over its normally closed contacts rp 2 to RPN, it interrupts the possible Ansprechstromkreise the relay, which store the first digit of the prefix, and via its working contacts rp 2-rp 5 it prepares the storage of the second digit of the prefix, ie the number Q, via the relays epa ... epd. Its working contact r /> 6 closes it shorts its left winding, so that the relay receives a dropout delay, and puts direct earth to the relays epa and epd. Via its break contact rp 7 it opens the circuit for the transmission of the official signal.

The receiver is then ready to receive the impulses characterizing the second digit (Q) via the relay ag-am. ,,

It has been assumed that Q is represented by the numeral 2. The transmission of this number corresponds to the delivery of two voting impulses. From the preceding description it follows that the state of the receiving relays at the end of the second pulse is as follows: Relays ai, ak and aj have responded.

Relay ad then drops out and with its contact ad ^ short-circuits the relay ae , which drops out with a certain delay. If the relay ad has dropped out, the incoming wire 411 of the coding device CD 2 is grounded over the drop-out time of the relay ae. The following circuit is then closed when it is assumed that the relays ai, ak and aj have responded: earth , normally open contact ac 4, wire 409 , normally open contact ae 2, normally closed contact ad2, wire 411, normally open contact aj 1, closed contact at 2, wire B , Cable 401, wire B, normally open contact rp 3, normally closed contact ro 3, relay eqb, battery, the relay eqb being energized.

After the relay eqb has been energized, it closes its contacts. It prepares its own holding circuit via its working contact eqb 2 and the left winding of the relay rq as well as the common ground of the memory.

The delayed relay ae drops out and takes the earth from the coding device CD 2 by opening its contact a <? 2 and from the receiving relay by opening contact ae 1. The relay rq then responds and the holding circuit of the relay eqb is closed. The receiving relays ai, ak and aj drop out. The receiver is then ready to receive the third series of pulses corresponding to the number M.

The registration of the digit Q in the memory ER is marked by energizing the relay rq. Relay rq closes its own holding circuit via its normally open contact rq 1. Via its normally closed contacts rq 2-rq 5 it opens the possible response circuits of the relays eqa-eqd and via its normally open contacts rq2-rq ^ it prepares the response circuits of the relays, which store the digit M selected by the calling subscriber. Via its normally open contact rq 7 it closes the following circuit: battery, relay rf ■ (Fig. 6A), normally closed contact rg 3, normally open contact rq 7, normally closed contact eo 1, parallel to it en and esi, wire uo 711, normally closed contacts sq 8 and soi, earth so that the relay rf is energized.

After the response of the relay rq, which follows the dropout of the relay ae , the receiver is ready to receive the thousands digit. In the example on which the description is based, this is number 2.

From the foregoing it follows that when the second dialing pulse ends, the thousand digit is recorded by the receiver whose relays ai, ak and aj have responded. In the manner described above, a pulse is sent via the following circuit: earth, normally open contact ac 4, coding device CD 2, wire B, cable 401, wire B, normally open contacts rp 3 and rqs, normally closed contact rr ^. , Wire 512, normally closed contact

609 550/170

I8058VIIIa / 21a ^s

Relay emb, battery, whereby the relay emb responds.

After responding, the relay prepares emb

its own holding circuit in front of its working contact emb 2 to the common ground of the memory via the working contact ac 5 and the left winding of the relay rm.

As before, the relay ae drops out and removes the ground potential from the incoming wire of the coding device CD 2 and the receiving relay ag-am . The relays ai, ak and aj drop out and rm responds.

The energization of the rm relay indicates that the thousand digit has been recorded in the memory ER. Via its normally open contact rm 1, rm closes its own holding circuit. Via its normally closed contacts rm 2-rm 5 it opens the possible response circuits of the relays ema-emd, and via its normally open contacts rm 2-rm 5 it prepares the response circuits of the relays eca-ecä , which contain the coded identifier of the next digit, i.e. the hundred digit , correspond. It short-circuits its left winding via its normally open contact rm 6 and applies direct earth potential to the relay emb.

If the hundreds digit is 5, it is identified by five dialing pulses. From the. The preceding description follows that at the end of the fifth pulse the relays ag, ai, ak, ah and al of the receiver have responded and that after the fall of ad over the fall time of the delayed relay ae by applying ground potential of the contact ac 4 to the incoming Wire of the coding device CD 2, the following circuits are closed:

1. Earth, normally open contact ac 4, wire 409, normally open contact ae2, ' normally closed contact ad 2, wire 411, normally closed contact ah 2, normally closed contact on 1, wire A, cable 401, wire A, normally open contacts rp 2 and rq2, normally closed contact rr 3, wire 510, normally open contact rm2, normally closed contact rc 2, relay eca, battery;

2. Circuit already described, normally open contact al 2, normally closed contact on 3, wire C, cable 401, wire C, normally open contacts rp4 and rq4, normally closed contact rr S, wire 514 , normally open contact rm 4, normally closed contact rc 4, relay ecc, battery, whereby the Relays eca and ecc are energized.

After they have responded , these relays prepare their own holding circuit via the left winding of the relay rc and the common ground of contact ac 5 of the memory via their working contacts eca 1 and ecc 3.

The relay ae drops out and separates the coding device CD 2 and the receiving relay of the receiver from the earth of the contact ac4 via its working contacts ae2 and ae 1. The relays ag, ai, ak, ah and al drop out and prepare the receiver to accept the tens digit (D).

The relay rc responds and thus marks the receipt of the hundred digits by the memory ER.

The relay rc closes its own holding circuit via its normally open contact rc 1. Via its normally closed contacts rc 2-rc 5 it opens the possible response circuits of the relays eca-ecd, and via its normally open contacts rc 2-rc 5 it prepares the response circuits for the receiving relays of the tens digits eda-edd . It short-circuits its left winding via its normally open contact rc6 and applies direct earth potential to the relays eca and ecc.

The tens digit is a 7 and is identified by seven dialing pulses. As can be seen from the preceding, the receiving relays ai, aj, al and am are energized on the eride of the sixth pulse.

At the beginning of the seventh pulse, the relay aa, which was excited at the end of the sixth pulse, drops out. Since the relay ah is in the rest position, the relay aa causes, via its break contact aa 3, in a known manner, the excitation of the relay ag by switching on its right winding, so that the relay responds. The relay aa picks up again at the end of the seventh pulse.

As already emphasized, after the re- energization of the relay aa , the relay ag is maintained via its normally open contact ag 2, and the relay ah is energized via the contacts aa2 and ag 4.

If relay ah has responded, it switches on the second winding of relay ai via its working contact ah 5 and working contacts 0/3 and ai2. This neutralizes the relay and drops out.

The receipt of the tens digit (7) is therefore marked in the receiver by the activation of the relays ag, ah, aj, al and am .

In a known way, the contacts of these relays in the coding device CD 2 close the following circuits:

1. Earth., Normally open contact ac 4. . ., Make contacts aji, al 6, ah 3 and am 2, wire B, cable 401, wire B, make contacts r /> 3 and rqs, break contact rr 4, core 512, make contacts rm 3 and rc 3, break contact rd 3, relay edb, battery; *

2. Circuit already described , make contact on 4, wire D, cable 401, wire D ^ make contacts rp5 and rq§, break contact rr6, core 516, make contacts r «5 and rc 5, break contact rd 5, relay edd, battery.

The relays edb and edd pick up . Via their working contacts edb 2 and edd 4 , these relays prepare their own holding circuit via the left winding of the relay rd .

When the delayed relay ae is back in the normal position and thereby separates the coding device CD 2 and the receiving relay of the receiver RE , the relays ag, ah, aj, al, am fall off, the relay rd is energized and marks the end of the in the receiver Storage of tens digits.

The relay rd closes its own holding circuit via its normally open contact rd 1. Via its

550/170

/ 8058 VIIIa / 21a ^s

Normally closed contacts rd 2-rd 5 it separates the possible response circuits of the relays eda-edd , and via its ^{normally open contacts ro 1} 2-rd 5 it prepares the response circuits for the memory relays of the units digits, eua-eud . Via its normally open contact rd6 , it short-circuits its left winding and applies direct earth potential to the relays eda and edd.

The ones digit is marked with a zero to through ten voting impulses.

As can be seen from the foregoing, the relays ag, ah, aj, al and am in the receiver have responded at the end of the seventh pulse. The relay aa drops out at the beginning of the eighth pulse. With its normally closed contact aa $ it switches on the second winding of the relay ag via the normally open contacts ahi and ag 3. The fluxes in both windings of the relevant relay ag are the same and opposite, so that the relay ag drops out,

The relay aa picks up again at the end of the eighth pulse and opens the holding circuit of the relay ah with the contact aa 3, so that the latter drops out.

After the relay ah has dropped out, it opens the excitation circuit of the relay aj, which drops out, via its normally open contact ah 5.

If relay aj has dropped out, it opens via its normally open contact α; 4 the response circuit of the relay al, which drops out again. The relay on stays on via its normally open contact on the 5th.

The eighth pulse is therefore characterized by the excitation of the relay on .

The relay aa drops out at the beginning of the ninth pulse and causes the relay ag to respond in a known manner via the normally closed contact aa 3, which is held by its normally open contact ag 2.

The relay aa is re-energized at the end of the ninth pulse and closes via the working contacts 002 and. ag4 the response circuit of the relay ah.

Via its normally open contact ah 5, the relay ah closes the response circuit of the relay αϊ by switching on its right winding. The relay ai therefore responds and maintains its contact ai 1. The relay am always remains energized.

The ninth pulse is therefore characterized in the receiver by the excitation of the relays ag, ah, ai and am .

The relay aa drops out again at the beginning of the tenth pulse and also causes the relay ag to drop out in a known manner.

The relay aa is energized again at the end of the tenth pulse and, as is known, causes the relay ah to drop. ,. "

If the relay ah has dropped out, it opens its normally open contact ah 5, so that the relay aj picks up and the short circuit of its right winding is canceled.

If the relay aj has responded, it causes the relay ak to respond via its normally open contact aj 4 via its right-hand winding.

The reception of the tenth pulse is therefore characterized in the receiver by the activation of the relays ai, ak, aj and am . ,

As already described, the delay-release relays ad and ae still hold for a certain time so that the earth potential can be applied to the coding device CD 2 and the coding can be carried out.

When relays ai, ak, aj and am are activated, the following circuits are closed:

1. Earth through normally open contact ac 4, already described circuit, normally closed contact ah 2 , normally open contact on 1, wire A ₁ cable 401, wire A, already described circuit, wire 510, normally open contacts rm2, rc2 and rd 2, relay eua, battery;

2. Circuit already described, break contact al 3, make contact α / 2, break contact ah 4, make contact on 3, wire C, cable 401, wire C, circuit already described, wire 514, make contacts rm4, rc4, ra'4, relay euc , Battery; ^

3. Known circuit, normally open contact am4, wire D, cable 401, wire D, circuit already described, wire 516 ,. Normally open contacts rm'5, rc 5 and rd5, relay eud, battery, so that the relays eua, euc and eud are energized.

With their working contacts eua 1, <? Mc3 and eud 4 , these relays prepare their own holding circuit via the left winding of the relay ru and the common ground of the memory.

The delayed relay ae drops out and causes the relay ru to respond and the relays ai, ak, aj and am to drop out.

The addressed relay ru marks the registration of the unit digits in the memory and consequently indicates that the digits P, Q, M, C, D and U dialed by the calling subscriber or otherwise have all been correctly stored.

The relay ru closes its own holding circuit via its working contact ru 1. It short-circuits its left winding via its working contact ru2 and applies direct earth potential to the relays eua, euc and eud. Via its normally open contact r «3 it closes the following circuit: generator Ge2, normally open contacts ru 3 and rpy, wire 400, no capacitor Cd 40, normally closed contact ad 1, middle winding of relay aa, earth. The waiting signal sent by the generator Ge 2 is inductively transmitted to the right and left windings of the relay aa and to the subscriber via a circuit already described. This signal tells the subscriber that the number he has dialed has been saved. Via its break contact ru 4 (Fig. 4) the relay ru opens the response circuit of the receiving relay ag-am. -

The following table shows the receiving relays that are energized with each of the ten dialing pulses that the receiver RE can receive, as well as the coding wires that are used to energize the relays that contain the various digits P, Q, M, C , D and U of the phone number. :

60S 550/170

18058 VIIIal21a ³

Impulses Dressed ai - ak - Receiving relay aj aj aj al - at the Used
Coding wires B. C. D. I. ag- ai ak - Ah -aj -aj al - at the A. B. C. D. 2 ak - - al at the D. 3 ■ ag- ■ ak- Ah - - - al at the A. D. 4th ai at the D. 5 ag- ai ■ Ah A. B. C. 6th A. B. C. 7th ag- Ah 8th ■ ai - ak - A. 9 ag- ai Ah IO A.

As already mentioned, the relay rf responded after receiving the prefix PQ . This relay causes a converter TR to be occupied by the district memory ENR via the converter connector CTR (FIG. 8).

The switching operations that lead to the assignment of a converter will now be described.

The converter connector CTR is shown schematically in FIG. 12 to show the essential processes involved in connecting the memories to the converters.

The EN memories are in p groups GRi ... GRp , each of which η memory EN ι. . . ENn contains.

Each group GR is connected to a group relay set KP . There are p relay group sets KPi. . . KPp, each of which contains η relays, each of these relays being connected to the memory of the group in question.

Each of the two converters considered in the present description is connected to a relay set KEi, KE2 , of which each relay set KEp contains relays which correspond to the p groups. It follows that each converter has access to any memory in a group via one of the p relays of the set KE. Each incoming call to the connector is identified by a memory of a predetermined rank in a predetermined group.

The relay set KF therefore has the task of determining the rank of the calling memory in any group and bringing it into call position to the two relay sets KE . These two relay sets again differentiate the group to which the calling memory belongs.

The relay sets KE contain preferred switching devices that alternately give priority to one of the two groups. The group KE selected in this way determines the converter that establishes the connection.

After the converter has been occupied, the connection between it and the calling memory is made via the connector relays KB and KA .

Assuming that all memories of all groups are brought into the call position at the same time, then the group relay sets KF, which also contain preferred switching devices, differentiate in each of the groups Gi? ι. . . GRp a memory of predetermined rank. These p memories are then how. has been previously explained, brought into call position to both converters via the two relay sets KE.

The alternate preferential for the two RelaissätzeJ ⁵ CE available switching means makes it possible to select two different among the accommodated in Rufstellung p memory, and so allows the simultaneous construction of two compounds with the aid of the two provided converter, as two equal relay ke of the two relay sets is mutually exclusive.

In the example described, two converters of a certain number of are divided into groups Save assigned.

It is now assumed that a single memory of the first group is connected to the converter connector is brought into call position.

The relay rf closes the following circuit via its make contact rf ι : battery, resistor i? *? 8o, make contact kc 2/1, relay kfi, which is the first memory of the first group. belongs, wire 603, normally open contact rf 1 (Fig. 6 A), wire 602, normally closed contacts ka 1/3 and kbi / 3, earth. As described, the relay kc of the converter connector has responded when no memory is connected to a converter, an assumption that has been made for the present description; the relay kf 1 is therefore energized and thus indicates the occupancy of the memory in the relevant group.

Via its normally closed contact kf i / i, the relay kf ι opens the response circuit of the relay kc, which drops out with a delay so that the relay kfx can respond safely. About his work contact kf \\\ it closes its own maintenance circuit and its operating contact kf following half circuit: earth, open contact kf 01.02, break contact chain £ / 2/3 system. . . kfn / 3 of the ^ / relays belonging to the first storage group, normally closed contact kci, relay kd, battery. The relay kd responds when the release-delayed relay kc is in the rest position again. As soon as the relay has responded kd , it prepares through its work con-. clocks kd2 and kd $, connected to the normally open contacts kf 1/4 and kf 1/5, the response circuits of the through- switch relays, which connect the district memory ENR with the converter TR .

As described, two converters TR 1 and TR 2 can be connected to the occupied memory. ■

Each converter contains as many relays ke as there are memory groups which are connected so that holding one relay prevents the other from being held.

As can be seen from FIG. 8, the relay kg is energized when none of the fc <? Relays has picked up. The relay kg closes the following circuit via its normally open contact feg-2/1: earth, normally open contact kf 1/7, wire 800, normally closed contact ke 1/2 in the conversion, relay ke 1, normally open contact feg-2/1, resistance

550/170 '

18058 VIII a / 21a ³

stood Re8i, battery, so that the magnet attracts ke ι the first storage group.

The multiple arrow on. the wire 800 with the index η indicates that the same circuits would exist for the η storage tanks in a group if these η storage tanks are brought into call position.

It should therefore be noted that the response circuit of the relevant relay ke 1 has a contact of the same rank as that in converter 1

10. Lies, leads. The same circuit is also closed in this first converter by the normally open contact kfi / 6 of the energized fe / i relay.

The break contact chain of the Äe relays of rank 1, which, when all these relays are in the rest position 'enables the corresponding% relay in each of the converters, is connected in reverse to each of the converters concerned. In the converter 2 z. B. is the relay ke ι the battery closest, while in the converter 1 this, first relay ke 1 is furthest away from the battery. This arrangement makes it possible to give priority to group selection in each converter, e.g. B. at ENR to reverse.
In the present description it has been assumed that only the first memory ENR of the first group was brought into call position and so led to the response of the relay kf 1 in the converter connector CTR . It is now assumed that the kei relay, which corresponds to this first group, is energized in the converter 2.

It is noted in this connection that

both converters TR1 and TR 2 are absolutely the same. and the same switching processes take place.

The fee relays that belong to the same group in each converter are connected in such a way that a fee relay of the same rank in each converter responds faster than the other and so the converter, to which it is connected enables the call to be forwarded and the other converter to be triggered, as soon as he receives a call.

Via its normally closed contact keiji , the relay ke ι opens the response circuit of the relay kg, which drops out with a delay so that the relay ke 1 can safely pick up; It closes its own holding circuit via its normally open contact ke i / i. The relay ke 1 opens the response circuit of the feii relay of the first converter via its normally closed contact ke 1/2. Over its make contact 1/3 ke it includes the following circuit: battery resistance Re 82, working contact kei / 3, break contact ke 2/4. . . kep / 4, left winding of the relay try. Earth, so that the try relay responds.

The relay kg drops out. Via its normally closed contact kg 1 connected to the normally open contact ke 1/5 of the actuated £ <? Relay, the relay closes the following circuit: battery, resistor Re 82 , normally open contact ke 1/3, normally closed contacts k 02/4. . . kep j 4 and kg τ, Ader8oi , make contact ke 1/5, core 802, make contact kd 2, make contact kf 1/4, core 804, relay kb ζ-kb I _x core 600, make contact r / 3, earth. The connector relays kb l-kb 5 pick up.

In relation to the circuit just described, it is noted that the wire 801 is connected to p contacts ke 1/5, which each correspond to the p groups of the memory present. There are therefore p wires 802 each connected to the p contacts kd, 2 , which each correspond to a memory group. Each contact kd 2 connected to a storage group is multiply connected to the η contacts kf 1/4 which are connected to the various memories in the group. At these contacts there are ρ X η wires 804, which end at the fefr relay. A corresponding circuit results for the converter 1.

From the preceding description it can be seen that five relays kb 1 ... kb 5 are available for each memory. This arrangement has been made in order to have a sufficient number of contacts.

The actuation of the relay try shows that the converter TR has occupied the group of district memories ENR which contains the memory ER to be operated.

About his break contact try one keeps the relay try to Ansprechstromkreis the relay kg open until it falls. Via its normally open contact try 2, it closes its own holding circuit as follows: battery, right winding of the relay try, normally open contact try 2, normally closed contact in / 3 and, in parallel, go trt4, normally open contact kb 1/2 of the activated relay kbi, and via one already described Circuit ground potential of contact rf 2. This circuit also serves to hold the relay kb ι. . . kb p.

About your working contacts kb i / i. . . kb $ ji cause the relays kb τ. . . kb 5 the response of the converter relay tr χ via the ground potential of the normally open contact rf 3 in the memory ER, as well as the pick-up of the relay tr j via the normally closed contact tr ed ι. ioo Via its break contact kb 1/3 the relay kb ι opens the response circuit of the relay kfi, which drops out. The relays kb 1 close via their normally open contacts kb 1/5 ... . . kb 5 all the circuits that enable the transmission of the operating codes and coded dial codes from the converter to the memory.

The pick-up of the relay tr χ indicates that the converter is being used by the memory. The relay tr χ no closes a holding circuit for the relay try via its middle winding via its normally open contact tr χ 2.

When it is activated, the relay tr) shows that there are no detour lines and that the outgoing lines to be checked for group selection are direct lines.

After relay kf 1 has dropped out, it closes the response circuit of relay kc again via its normally closed contact kfifi, so that it picks up. Via its normally open contact kf 1/2 it opens the response circuit of relay kd, - which drops out. About his work contact kf 7.1 it opens; Kei relay hold circuit so it will drop out.

■ The relays kei, kd and kfi are put in the idle state again. About your work contacts

609 650/170

I 8058 VIII a / 21a ³

kei / s, kd2 and kf 1/4 open the response circuit of the connector relays kb 1, which, as has already been explained, continue to hold.

In this way, all the relays that have enabled the occupied memory to select a converter have been restored to their initial state, with the exception of relay kg, whose circuit has been opened by contact try 1. This converter can no longer be used to make another call, since contacts kg 2 of relay kg are open. The converter can then receive the class identifier, as well as the prefix PQ, which have been recorded in the memory ER in the manner described above.

It is assumed in the following that the prefix PQ is sufficient to determine the connection route to the local exchange or the group of the called subscriber.

The converter Ti? contains relays that have the task of receiving the class identifier and the prefix. While this is a local call, it should be noted that the converter contains the same relays to receive the flags from the country memory ENN or characters for special cases. The contacts of these relays are arranged in pyramids and switched in such a way that in the example considered here it is possible to obtain a hundred switching points which are arranged in the distributor RP and correspond to a hundred prefixes. The task of the converter is to send selection and company codes to the memory so that it can receive the

. Can establish connection. For this purpose, the converter contains a certain number of coils through which a wire can be passed, one end of which is connected to a contact of the distributor RP and the other to a contact of the connection Ba ' . With each toroidal coil, e.g. B. GA, is a cold cathode tube, e.g. B. TGA, and a relay, e.g. B. tpga connected. When a pulse is sent over the wire, it induces a certain current in the relevant coils. This current ignites the corresponding cold cathode tube and causes the relays connected to the tubes to respond.

These switching operations. represent the conversion. The indicators converted in this way are then sent back to memory.

As already mentioned, the converter receives the class identifiers registered by the two relays eea and eeb of the memory ER.

The following circuits are closed via the contacts of the relay kb of the converter connector CTR :

ι. Earth (Fig. 4), normally open contact ac5, wire 404, normally open contact eea 1 of the actuated relay eea, wire a ' in cable 814, cable 824, cable 814

, 60 ( Fig.8A), normally open contact Ä & 2/14, relay trea,

Battery;

2. Circuit already described, normally open contact eeb 2 of relay eeb, wire V in cable 814 ,.

Cable 824, cable 814 (Fig. 8), normally open contact Ä & 2/15, relay treb, battery. This causes the relays trea and treb to pick up.

The contacts of the relays trea-trec, which receive the class identification, form a pyramid PyS, which has an incoming earthed wire and eight outgoing wires 831, which lead to eight relays tri . These eight relays tri correspond to the eight class codes that can be received via the c-wire of the memory seeker, as described. The 'iri relay which corresponds to the received class identifier' picks up.

In the same way as described for the class designation, circuits are made from the relays epa, epd and eqb, which have the digits. PQ received, closed and ver causes the relay traa, trad and trbb of the converter to respond.

The contacts trbajd 1-4 of the relays trba / d are grouped in a pyramid Py 5, which has one incoming and ten outgoing wires 828, which are connected to ten relays trfa . Likewise, the contacts traa / d ^ -8 of the relay traa / d are arranged in a pyramid Py 11, which has an incoming wire 840 and ten outgoing wires 842, which are connected to the ten working contacts trfa 1, which each to the ten Relay trfa belong. At the output of these ten contacts, one receives a hundred wires 844, which are connected to the hundred switching points of the distributor RP . These hundred switching points correspond to the hundred possible district prefixes PQ. The wires which, as shown, the toroidal coils, e.g. B. GC, GD. . ., cross and end at the points of the earthed terminal strip Ba ' , can be led out from these switching points.

D.as £ r / a relay, which corresponds to the digit Q stored and evaluated in pyramid Py 5 , pulls on and closes its normally open contact trfa ι.

It is assumed that the establishment of the connection does not depend on the class of the calling party. It is then sufficient to convert the two digits P and Q. The converter replies by sending out the company identification "do not send any coding - the called office is from the same system as the exit office".

A wire leads from point a 1 of the distributor RP via the toroidal coils GA, GC, GE, FA and FC and ends at point α ' ι of the terminal strip.

To send a pulse over this wire, a discharge device is available, consisting of a cold cathode tube TZ, which is connected to a relay trz. With the aid of this circuit arrangement, the capacitor Cd 80, which is charged via the self-induction coil vSV8o and the resistor Re 85, can be connected via the wires 842, 844. . . unload.

The cold cathode tube TZ has an anode A, a control electrode G and a cathode K, which is connected to a relay trz . The resistors Re 87, Re 88, ReSg and the capacitor Cd 81 form

.609550 / 170

/ 8058 VHIa / 21a ^s

a network that allows the discharge to be regulated.

When the relay tr χ has responded, it closes the following circuit via its normally open contact tr χ ι: battery, resistor Re 86, normally closed contact tr ζ ι, normally open contact tr χ ι, wire 840, pyramid Py ix, wire 842, normally open contact trfai, terminal a 1 of the distributor · RP, wire Yes via the toroidal coils GA ₁ GC, GE, FA and FC, terminal a! 1 of the terminal strip Ba ', earth.

A current is induced in the secondary winding of the toroidal coil, bringing the build-up potential to the potential of the control electrode of the tubes TGA, TGC, TGE, TFA and TFC , which are each connected to the respective coils. Via its normally open contact tr χ 4, the relay tr χ places the control electrode of the tube TZ almost at ground potential and grounds the anode. The tube TZ ignites, so that the following circuit is closed:

Earth, normally open contact tr χ \, anode A, cathode K of the tube TZ, relay trζ, battery Bt 1, so that relay tr ζ is energized.

With its normally open contact tr ι the relay tr ζ puts the capacitor Cd 80 on the circuit leading through the toroidal coils, so that the capacitor discharges. This impulse generates an induction voltage in the various coils, which ignites the tubes connected to them. The relay tpga. . . tpfc, which are connected to the various tubes, respond in a loop with the battery Bt2 and the grounded normally open contact tr χ 2 .

As already mentioned, a cold cathode tube TGA is connected to each coil GA in this converter (FIG. 9). A relay tpga is connected to each tube.

As has already been pointed out, the task of the converter is to provide the one connected to it To send the memory switch indicator so that it can continue to establish the connection.

These indicators are implemented in the memory in relay combinations that enable the connection to be established in the following cases:

* ·> Coded Actuated he it 6th Not converted Actuated Prefixes relay eo - he eo - it 5 Digits relay for 4th National O 5 ° talk eo - he - it Digits provided 5 - ■ possibly 4th eo - ex 3 - ev - ex 2 55 I. O

The relays ev and ey are energized if the end office is of the same system as the exit office.

If the feed bridge is switched off, the relay et responds; if the call and signal machine fails, the relay picks up .

The memory sends the converter the selected prefix, the class of the calling subscriber and, if necessary, a detour indicator.

Once the converter has received this identifier, it must in the present case cause the following:

1. If the prefix is incomplete, a Trigger switching process that causes a converter is occupied again, when the relevant prefix has been completed;

2. the number of digits and coded dialing codes determine which will be sent to memory;

3. Determination of the various coded dialing codes;

4. if necessary, the way in which the encoded dialing numbers and the digits are sent out should be.

For this purpose the converter contains a whole series of relays tpga. . . tpad, each corresponding to a special relay in memory.

Depending on the nature of the case, one or more relays are tpga. . . actuated, which in turn bring the corresponding relays in the memory connected to the converter to respond and thus enable the connection to the called subscriber to be established.

The relays tpga, tpgc, tpge, tpfa, tpfc respond in the present case and close the following circuits:

ι. Earth, working contacts tpga 1 and kb ^ / 4, wire 817, 824, wire 817a, relay ev, battery;

2. Circuit described above via normally open contact tpgc ι and kb 3/6, wire c (Fig. 6 A), relay ey, battery;

3. Earth, normally open contact tpge 1 and £ & 3/8, cable

817, cable 824, cable 817, wire e, wire 706, cable 712, wire 706 (Fig. 7), left winding of the relay see above , battery;

4. Earth, normally open contact tpfai and kb ^ / io, cable

818, 824 and 818 (Fig. 6A), wire α, relay eo, battery;

5. Earth, normally open contact tpfc 1 and kb 3/12, cable 818, 824, 818 (Fig. 6A), wire c, relay es, battery.

The transmitter relay so and the relays ev, ey, eo and es of the memory respond and release in the relevant one. Save the switching processes for sending out the dialing pulses.

The starter relay as the transmitter picks up. Via its normally open contact ^ o 2 it closes the following circuit: earth, normally open contact ac4 (Fig. 4), wire 408 , normally open contact so 2, normally closed contacts sj 2, sf2 and sh2, left winding of relay si, battery .. The relay si, its right winding is short-circuited by sl2 , responds with a delay. About his work as contact 4 relay sets as the earth of contact ac 4 to the changeover contact ps2 and leaves the Abgreifkette on. About his work as contact 6 and the earth of ^work: contact ac4 the relay closes as its own

609 550/170

18058 Villa / 21a ³

Holding circuit. Via its normally closed contact so ι it opens the response circuit of the relay rf, so that the latter drops out.

As soon as the relay rf drops out, it opens its normally open contacts r / 2 and r / 3, which release the converter, because via its normally open contact rf 2 it opens the holding circuit of the relays kb 1 ... kbs so that they drop. It also opens the response circuits of the relay tr χ

ίο and tr], which also fall off.

Are the relays kb 1. . .kbz, dropped out, they open their working contacts and interrupt the response circuits of the relays traa / d and trbajd, which drop out and also cause the relay trfa to drop out.

If the relay tr χ has dropped out, it interrupts the response circuit of the relays which send out the coded prefixes and company codes. The relays tpga, tpgc, tpge, tpfa and tpfc are in the rest position.

If all relays of the converter are in the rest position, the relay try, which has held, drops out again.

If the relay try has dropped out, it closes with its normally closed contact try 1 again the response circuit of the relay kg, which responds and has thus reached its starting position again.

The converter Ti? is thus triggered and ready to receive a new call.

The relay ev indicates that it is a local connection. It closes its own holding circuit via its working contact ev 4 and the common ground of contact at4.

When the relay ey has responded, the switching processes are triggered which make the group selection of the called subscriber,

The relay ey separates the relays eqb and eqc from the wires B 1 and C 1 via its break contacts ey 1 and ey 2. About his resting con-. At ey 3, the relay ecd is disconnected from wire D 1. Via its normally closed contact ey 4 it separates the relay eqa from the wire A1 , and via its normally open contact ey 4 the application of ground potential to the wire A 1 for tapping the coded identifier is prepared by the relay pq. About his break contact ey 5 separates the relay eqd off and ey about his working contact 5, the tapping of the state is the relay ecd pq prepared by the relay ^first About his work contact ey 8. and the earth of contact ac 4 it closes its own holding circuit.

After the relay eo has picked up, it transfers the incoming wires 605 and 606 of the pick-off chain via its normally open contacts eo 2 and eo $ . Via its normally open contact eo 6 it prepares the response circuit of the relay / '/' to enable the first stored digit to be picked up, and through its normally open contact eo 7 it closes its own holding circuit.

If the relay it is actuated, it indicates in connection with the relay eo that no prefix is provided in the example described.

About the make contact is 5 closes the relay following circuit: battery "Relay pp, working contacts EO6 and 5, wire 504, normally closed contacts pm'2» PQA, pd 3, pc4, pi 4 and po2 make contact eo2, normally closed contacts ps 2, rs 3 and earth of ac 4 (Fig. 4), whereby relay pp responds.

If the relay pp has picked up, it closes its own holding circuit via its normally open contact pp 1 and the earth of contact ac 4. It prepares the response circuit of the relay pq via its normally open contact pp 4. In parallel to its response circuit, it closes via its. Working contact pp 9 following circuit: Circuit already described, working contact pp 9, wire 505, break contact ex 3, working contact ev 2, relay po, battery.

As soon as the relay po has responded, it closes its own holding circuit via its normally open contact po 3. Via its contacts po 1 and p0 2 in conjunction with the contacts eo2 and eo 3, it turns over the wires 605 and 606 again. This enables the relay pq to respond via the following circuit: Earth ..., normally closed contacts rs 3 and ps 2, normally open contacts eo2 'and poi, wire 605, normally closed contacts pd 4, pu2, pm.4, pe? ,, wire 503, normally open contact pp 4, relay pq, battery. The relay /> g is energized.

After the relay pq has responded, it opens the holding circuit of the relay pp via its normally closed contact pq 2 , so that it drops out. It closes its own holding circuit via its normally open contact pq 1. It prepares via its normally open contact pq 4. the response circuit of the relay pm , which is used to pick up the thousands digit. Via its working contact pq 5 in conjunction with the working contact ey ^ it grounds wire A 1 of the license plate relay sa of the transmitter EV. A criterion about the state of the relay ecd can be obtained via its normally open contact pq 8 in connection with the normally open contact ey 5.

The relay si, delayed by short-circuiting its right winding, responds and triggers the switching processes in the transmitter, which indicate the readiness of the memory to send out the indicators for the group selection.

As previously stated, the ten thousand participants assigned to the office under consideration are divided into groups of five hundred participants each. The thousands and hundreds digits are sufficient to determine the group of five hundred that contains the called subscriber. Each group of thousands contains two groups of five hundred that belong to the first and second halves of the thousands. The hundred digit identifies the individual of the two possible groups of five hundred to which a participant can belong. Referring to the table of coding wires A, B, C, D, which are used for the various digits of the call number, it can be seen that wire D is only earthed for the digits 6, 7, 8, 9 and ο; it is not used for the numbers 1, 2, 3, 4 and 5.

550/170

I8058VIIIa / 21a ^s

It is therefore sufficient to check the status of the relay ecd in order to be able to determine whether the called party belongs to the first or second group of five hundred. Two dialing codes are therefore sufficient to define a group.

In order to identify a participant in a group, it is necessary to send three dialing IDs; the first is represented by the hundreds digit taken from the relays eca, ecb, ecc, which make it possible to determine one digit from five; this is sufficient because a group contains only five hundred; the second identifier is represented by the tens digit and the third by the ones digit.

About his break contact si 2 lifts the relay si to short-circuit his right winding, and si about his contact 2, it includes its own maintenance circuit. Via its normally open contact si 4, it grounds the c wire after the feed bridge via the following circuit: Earth (Fig. 7), normally closed contacts st 6 and sy 5, normally open contact si 4, rectifier Rd 73, conductor 407, normally open contact ac 3 and ν i, CHER switch contact and wire c.

This ground potential on the c-wire causes the group selection level to be assigned.

If the group selection level can receive the first selection combination, earth potential is applied to wire b ' of switch CHER and the following circuit is closed: Earth to wire b', contact of switch CHER , normally open contact ν 5, normally closed contacts sps, 2 and 3 each, rectifier i ? ö "75, relay sj, resistor Re 76, battery, so that relay sj responds.

The relay sj prepares its own holding circuit via its normally open contact sj 1. Via its break contact sj 2 it opens the circuit of the relay si, which drops out. Via its normally open contact i / 3 it closes the following circuit: common earth at ac 4, normally open contact so 2, normally closed 4.0 contacts sq 2, sh 1, sf 1 and si 1, normally open contact sj 3, left winding of relay se, battery, which attracts the relay se.

The relay se is a time pulse relay which, together with the relay sf, can sequentially pick up all the characters that are sent from the converter to the memory.

Via its normally open contact se 1, the relay se shorts its right winding so that it receives a drop-out delay. It closes its own holding circuit via its working contact se 2, and the following circuit is closed via its working contact se 3: Earth, working contacts ey 4 and pq 5, wire 509, normally closed contacts pm 5, pc $, pdz> and pu $, wire A 1, Cable 708, wire A 1 in the transmitter, normally open contact ie 3, relay sa, battery, so that relay sa responds. The relay se closes the following circuit via its working contact se 7: earth, working contact ie 7, upper winding of the relay sf, battery. Since the lower winding of the .60 relay sf is short-circuited, the relay is delayed on. The relay closes the following circuit via the same contact se γ : earth, normally open contact ie 7, wire 709, normally closed contacts rs 4 and psi, upper winding of the differential relay pr, battery, whereby the relay pr picks up.

As described, the relay ία has responded and controls the transmission of the first selection indicator for the group selection stage via the following circuit: earth, generator Ge 3, rectifier Rdj2, resistor Re 73 , normally open contact s αϊ, normally closed contacts sb 1 and sq 4, normally open contact ν 4, contact of the switch CHER, wire α '. The rectifier Rd 72 only enables the passage of the positive half-cycles in this circuit.

The relay sa closes the following circuit via its working contact sa 2 : earth, working contact ία 2, right winding of the relay sg, battery, so that the relay sg responds.

As has been explained, the circuit of the wire D τ to the relay ecd has not been closed, and the called subscriber is included in the first five hundred group of the group of thousands, identified by the digit M of the call number.

When the relay pr has responded, it prepares its own holding circuit via the contact pr 1, as well as a response circuit for the relay ps; the upper winding of the relay ps is short-circuited at the relevant point in time by the earth of contact ie 7 and the common earth via pn.

When the relay sg has been actuated, it opens the battery circuit of the wire α ' through its normally closed contact sg 1 after the selection code has been sent out, ie when the relay sa has dropped out and the license plate receiving relay can return to its idle position. It short-circuits its own left winding via its normally open contact so that the relay receives a drop-out delay. .

The delayed relay sf responds. Via its normally closed contact sf 1, it opens the response and holding circuit of the relay ie, which drops out with a delay because its right-hand winding is short-circuited. It opens the response circuit of the relay si via its normally closed contact sf2.

The drop-out delay relay ie drops out. It cancels the short circuit of its right winding via its normally open contact ie 1. Via its normally open contact ie 3, it opens the excitation circuit of the relay ία, so that it drops out. Via its normally open contact ie 7, it opens the excitation circuit of the relay sf, which drops out with a delay because its lower winding is short-circuited. The relay ie removes the short circuit of the upper winding of the relay ps via the same contact, so that it responds: Upper windings of the relays pr and ps, which are in series; Normally open contact pn, wire 704, cable 712, wire 704, normally closed contacts sqi, syi, st 3, wire 408, normally open contact ac 4, earth. .120

When the relay ία has dropped out, it separates the wire α ', via which the dialing codes are sent, from the generator Ge 3 via its normally open contact ία ι. Via its normally open contact ία 2 it opens the response circuit of the relay, which, since its left winding is short-circuited, has a drop-out delay

605 550/170

8058 VIIIa / 21a ^s

and therefore has not yet fallen away at the moment of consideration.

When the relay ps has responded, it separates the upper winding S of the relay pr from the earth of the contact 7 se 7 via its normally closed contact ps ι; this relay pr is held through its contact pr 1 and the upper winding of the relay ps. Via its normally open contact ps 1, the 'relay ps prepares its own holding circuit and at the same time

ίο switching on a second winding of the differential relay pr. By actuating its changeover contact ps 2 , the relay ps changes the earth of contact ac 4 from wire 605 to wire 606 via the normally open contacts eo 3 and pO2.

The circuit of the relay pm is then closed: earth at ac4 ... ., Wire 606, normally closed contacts pu 4, pe 4 and pdj ,, normally open contact pq4, relay pm, battery, so that the relay pm picks up and thereby the tapping of the

ao dialed and enabled thousands digit stored by the relay emb.

Relay pm closes its own holding circuit via its normally open contact pm 1. Via its normally closed contact pm 2 it opens the circuit of the relays in front of it and thereby causes the relay to drop out. It opens the response circuits of the relays in front of it via its normally closed contacts pm 3 and pm 4. It prepares the response circuit of the relay pe via its normally open contact pm 4. Via its normally closed contacts pm 5 -pm 8, it separates from the pick-up wheels A iD 1 all of the storage relays that are in front of the storage relays used to store the thousand digits. It prepares the response circuit of the transmitter relay sb via its normally open contact pm 6.

The drop-out delayed relay sf now drops out. Via its normally closed contact sf 1, it again causes the relay se to respond via a circuit already described.

When the relay se has responded, it short-circuits its right winding via its make contact se 1 and closes its own holding circuit via its make contact se 2. Via its working contact ie 4 and the working contacts emb 2 and pm 6 and wire B 1, it closes the response circuit of the relay sb. About his work Contact se 7, it includes the sf Ansprechstromkreis of the relay, which, as it is shorted, attracts delayed; The lower winding of the relay pr is switched on via the same normally open contact se γ : earth, normally open contact se 7, wire 709, normally closed contact rs 4, normally open contacts ps 1 and pr 2, lower winding of the relay pr, battery. The fluxes produced in the windings of the ^ r relay are the same and in opposite directions, SO ¹ that the relay drops out. The relay ps is held by its lower winding, which is parallel to the previous circuit.

As soon as the relay sb has responded, the second dialing code is sent to the group dialing stage via a '. The relay sb closes the following circuit via its make contact sb 1: earth, generator Ge 3, resistance Re Ji, make contact sbi, break contact sq 4, make contact ν \ and wire a ' to the group selection stage. The second dial indicator is characterized by the sending of an alternating current. Via its normally open contact sb 2 , the relay sb closes the response circuit of the relay sg, which has not dropped out in the meantime.

When the relay pr drops , it opens its working contacts pr ι and pr 2, but the relay ps holds, as described, ■ through its lower winding.

The delayed relay sf responds and, as mentioned before, causes the delayed dropout of the relay se.

If the relay is energized se, it causes the delayed drop of the relay sb and j /.- Likewise opens relay se over its make contact se 7 the holding circuit of the relay ps, so that it falls.

As soon as the relay sb has dropped out, does it disconnect the generator Gi? 3 from the wire a ' via its normally open contact sb ι and opens via sb 2 the circuit of the relay sg, which only drops out after a certain time due to the short circuit of its left winding.

After the relay ps has dropped out, it prepares again via its. Normally closed contact ps 1 the response circuit of the relay pr via its upper winding. Via its normally closed contact ps 2 , it removes the ground potential of contact ac 4 from wire 606 and applies it to wire 605.

As soon as the group selection device has received the two required dialing codes, it opens the circuit of wire b ', so that the relay sj drops out. . .

The relay sj prepares the response circuit of the relay si via its normally closed contact sj 2 . Via its work contact sj 3, it prevents the relay se from responding again until a new "send request signal" is received. The drop-out delayed relay sf now drops out.

The relay sf prepares the response circuit of the relay se via its normally closed contact sf 1 . Via its normally closed contact sf'2 , it closes the response circuit of the relay si, which is delayed response by shorting its right winding.

This also off delay relay sg now falls ab.und opens with his Ärbeitskontakt ig · 5 shorting his left winding.

The group selection facility then selects the group of five hundred, those called Contains subscriber, and then goes in the first stage of the subscriber selection device in the call position.

The delayed relay si responds. Via its normally closed contact si 2 it opens the short circuit of its right winding, and via its working -. contact si2 closes its own holding circuit. Via its normally open contact SI4, the relay si grounds the c-wire of the feed bridge via a circuit already described in order to occupy the line selection stage,.

If the line selection stage can receive the dialing flags, ground potential is applied to the

550/170

18058 VIII a / 21a '

Wire b 'of the switch CHER placed and so the circuit of the relay sj already described is closed, so that it picks up.

When the relay sj has responded, the hundred digit is sent out in a known manner. The relay pe picks up when the relays pr and ps are actuated and continues to switch the relays eca. . . ecd to be picked up via the 'working contacts ¹ pc $ -pc8 .

ίο In the example described, the hundred digit is a 5, the relays eca and ecc have picked up, which in turn respond. cause the relay sa and se. The transmitted identifier consists of a positive, pulsating current via the wires a ' and b'.

The tens digit is on it in the same way

sent out; the relays sb and sd are energized and send out an identifier consisting of an alternating current over the »'wire and a negative pulsating current over the 6' wire.

The ones digit is also sent out

in the same way; the relays sa, se and sd pick up and send out an indicator consisting of

. a positive pulsating current through the 'wire and an alternating current through the &' wire.

As when sending out the first two license plates

there are certain time intervals between the transmission of the last three indicators, which are determined by the delayed relays se and sf .

■ After actuation of the changeover contact ps 2 , the relay sq responds via the following circuit:

Earth, normally open contact ac 4, wire 408, normally closed contacts st 3, sy i, sqi, normally open contact so 4, wire 703, normally closed contact rs 3 , normally open contact ps 2, eo2>, po2, wire 606, normally open contact /> «4, wire 705, Relay sq, battery.

As soon as the relay sq has responded, it marks the completed transmission of the stored digits, causes the connection or the transmission of the busy signal to the calling subscriber and then triggers the memory. Via its normally closed contact sq 1, the relay sq opens the holding circuit of the storage relays for the coded digits ey, ev, se, eo and es, as well as the holding circuit of the relays so, po, pu, pr, ps, so that these relays drop out.

About his break contact sq 2 opens relay sq Ansprechstromkreis the relay and se sq about his break contact $ sm the holding circuit of the relay, which adheres to about sg4. It opens the response circuit of the relay sj via its normally closed contact sq5, so that it drops out. With its normally open contact sq6 , it closes its own holding circuit via the common earth of contact ac 4.

When the recipient of the subscriber selection device has stored the hundreds, tens and units of the number of the called subscriber, he interrupts the 6 'wire of the CHER searcher. The called subscriber is then selected by this subscriber selection facility.

The delayed relays sg and sf then drop out.

When relay sg has dropped out, it opens the holding circuit of relay sm with its contact ^ 4, but closes another via sg2: battery, relay sm, normally closed contact sg 2, normally open contacts sq4, ν 4, contact of switch CHER, wire α and Earth in the subscriber selector.

It is assumed that the called party is free. In this case, the subscriber selection device establishes the connection to the subscriber in question, and the earth potential is removed from the wire α 'of the searcher CHER, so that the relay sm drops out.

When the relay sm has dropped out, it closes its normally closed contact sm 1 again, which, in conjunction with the normally open contact sqy, short-circuits the resistor Rc and causes the relay in the feed bridge to respond, which establishes the connection with the calling subscriber.

If this connection is made, the receiving relay aa drops out after the circuit has been opened via the a and & wires in the feed bridge. . ■ '

The relay aa short-circuits the relay ac via its normally closed contact aa 1, so that it drops out with a delay.

The relay ac has now dropped out. It causes the delayed dropout of the relay via its normally open contact ac r. Via its working contacts ac4 and ac5, the relay ac removes the common holding earth of the receiver and memory, so that all relays in the memory that are still energized drop out: relays eca, ecc, edb, edd, eea, eeb, emb, epa, epd, eqb, eua, euc, rc, rd, rm, rp, rq, ru and sq. The memory ER is thus released.

The off delay S ρ ei rather relay drops out and opens with its normally open from 2 to holding circuit of the class relay. The relays ap and aq also drop out. The relay opens via its normally open contact from 3 and from the excitation circuit of the relay ax. But this relay could switch to memory relays that have not yet dropped out, e.g. B. a class relay, hold over the following circuit: earth, normally open contact ax 3, upper winding of the relay ax, resistance Reäfi, normally open contact as 2, upper winding of the relay as, battery. The resistance of the relay ax is so great that it does not prevent the relay as dropping out; the relay ax therefore controls the resetting of the memory relays. It therefore drops out and switches the wires ic and ch through, so that the memory can be occupied again.

The district storage facility is thus completely. Triggered and can establish a new connection.

The special cases that can occur when setting up a local connection will now be described will.

In the preceding description it has been assumed that the called party free is. It can now happen that this subscriber is busy. ,

In this case, the recipient of the subscriber selection device, after receiving the digits C, D, U , does not interrupt the &'wire,

609 550/170

/ 8058 VIIIa / 21a ^s

but creates tension. This closes the following circuit: Battery in the selector, wire b ', contact of the switch CHER, working contacts v5 nnd'sqS, lower winding of the relay sp, earth, so that the Beseitztzeiohenrelais sp responds.

When the relay sp has picked up, it opens with its normally closed contact sp ι the circuit via the i-wire, so that the feed bridge and all dial levels are triggered.

The switching operations when the memory EA ^ R is triggered take place in the manner described above.

It can now happen that the calling subscriber dials the number of the called subscriber slowly or that he pauses longer than intended between two series of pulses. The receiver RE has a time switch with two cams Cai and Ca 2. If the memory is occupied and cam Ca ι closes its contact, SO ', the following circuit is closed:

as earth, cam Cai, normally open contact acy, right winding of relay az, battery, so that relay az picks up. This relay lasts until it causes an incoming series of pulses to drop out. Otherwise, the cam Ca2 closes the circuit of another relay, if no series of pulses has been received in the relevant time, which

. sends the busy signal to the calling subscriber.

At the moment when the participant

Receives official signal, the relay aa responds and causes the relay ac to pick up in a known manner. On the other hand, the cam Cai, as has been shown, closes the response circuit of the relay as, SO ¹ that the relay picks up.

After this relay has responded, it closes its own holding circuit via the earth of contact ac 4, its left winding, the normally open contact as 1 and normally closed contact ad! 3. Relay as prepares the response circuit of relay sp via normally open contact as 2 .

45. If the calling party dials the first digit of the number of the called party before the cam Ca2 has closed its contact, the relay ad is energized. About his. Normally closed contact ad 3 opens the relay ad the holding circuit of the relay as, so that it drops out. From this moment on, the switching processes proceed as described above.

If the participant fails to dial before the cam Ca2 has closed its contact, the following circuit is closed via the earth of Ca2: earth, cam Ca2, normally open contact az 2, wire 405, upper winding of the j /> relay, battery so that the relay picks up sp .

When the relay sp, has responded, it opens in a known manner the circuit of the i-vein of Speiohersuchers and causes the transmission of the busy tone to the calling subscriber. The transmission of this busy signal triggers the memory ENR in the manner described. The same switching processes take place if the calling subscriber pauses too long between the individual series of elections.

It can now happen that the group selection device does not have a free outgoing line to the Can find line selector.

For this purpose there is a time switch with the two cams Cb 1 and Cb 2 in the transmitter.

On its first pass, the cam Cb ι closes the following circuit: earth, cam Cb 1 , normally open contact so ζ, right winding of the relay sz, battery, so that the relay is energized.

The relay ss closes its own holding circuit via its working contact ss 1: battery, left winding ¹ of relay sz, working contact ss 1, break contacts j / 3, sy 3, sh ^ and earth via working »i. contact ac 4. The relay sz prepares the response circuit of the relay sy via its normally open contact sz 2 .

If between the passage of the cams Cb 1 and C62 the holding circuit of the relay sz has not been opened by the normally closed contacts sf 3 and sh2 , then the transmission of a dial indicator is indicated by ^ / 3 and the abortion of the digit storage is indicated by sh2>; If the cam Cb 2 activates its contact, it closes the response circuit of the relay sy: earth, cam Cb2, normally open contact sz'2, normally closed contact sx ^, relay sy, battery, which picks up the relay sy .

As soon as the relay has responded , it initiates switching processes that allow a second attempt at dialing.

Via its normally closed contact sy 1, the relay sy removes the common holding earth from the identification memory relay and the tapping chain of the memory relay, as well as from the relay , whereby the re-assignment of the converter is caused by the response of the relay rf . Via its normally closed contact Sy 2 it interrupts the c'-wire of the seeker CHER and opens the holding circuit of the group or line selection device. Via its normally closed contact sy 2, it opens the response circuit of the relay sz; so that it falls off. Over its make contact sy 4 closes the relay following circuit: battery relay sy, working contact sy4, left winding of the relay sx, resting no contact sx 2, common holding earth. The relay sy holds, and ix responds. The relay sy interrupts the c-wire via its normally closed contact sy 5 in order to prevent the incorrect application of the meter earth during the dialing attempt.

As soon as the relay sx has picked up, it closes its own holding circuit via the contact sx ι. About his break contact sx 2 to open the holding circuit of the relay sy whose Ansprechstromkreis is 'sx been opened 3 *' by the normally closed contact and therefore falls. The relay sx prepares the response circuit of the relay sp via its normally open contact sx 3.

If the new choice does not lead to the goal when the cam C & 2 closes its contact again after the relay sz has been energized, the occupied

609550/170

I8058VHIa / 21a ^e.g.

matching cam Cb 2 to earth and closes the following circuit: earth, cam Cb 2, normally open contacts sz 2 and sx 3, middle winding of relay sp, battery. The relay sp responds and sends the calling subscriber the busy signal.

Similar switching operations take place if the choice is not normal for any reason runs.

In · the general description was first an explanation of the switching processes when saving and the transmission of the various Voting numbers given. These license plates will be sent out as soon as the electoral levels accept them can receive. It can happen that a dialing level can receive a dialing code, before the corresponding number has been saved.

. It has been mentioned that the converter TR

after storing the digits P and Q of the called subscriber's number by the

ao memory was occupied. The converter then causes, in a known manner, the transmission of the first group selection identifier via the working contacts ey4 and ey $ of the energized relay ey.
It can now happen that the hundreds digit has not yet been stored if, after the relay ey has been energized, an attempt is made to tap the status of the relay ecd in order to determine the group of five hundred to which the called subscriber belongs . In this case, the Abschalterelais talking sh via the following circuit to Earth on ac5, wires 404 and 507, normally closed contact rc γ, EYJ working contacts and PQC, wire 710, right coil of the relay sh, battery.

About his. Normally closed contact sh 1, the relay sh opens the response circuit of the time pulse relay se in order to prevent the pickup chain from being started until the hundred digit has been saved. Via its normally closed contact sh2, the relay sh opens the response circuit of the relay si, which cannot pick up until the other required digits of the call number have been saved. Via its normally closed contact sh ^ it opens the circuit of the left winding of the relay sz in order to prevent it from being held if the selection is carried out too slowly.

As has already been described, the cams Ca ι and Ca-2 are actuated when a delay occurs during the dialing or when storing the digits of the call number.

It is important that the identifiers are sent to the line selection stage as soon as the digits C, D, U have been stored in order to prevent the common control elements of the line selection device from being occupied for too long. As long as the subscriber has not yet dialed his last digit, the normally closed contact ru 2 is closed, and the relay sh picks up via the normally open contacts ey 6 'and pe 9 to prevent the round-off digit from being sent out.

It is to be adopted in the general description that only one memory is required, but as can be seen, the two converter ι TR, and TR 2 can be prepared by p storage groups, each of which contains η memory occupied.

It is z. B. assumed that the nXp memory via the normally open contact rf 1 of the memory (Fig. 6 A) are occupied and that the η memory of the ρ groups for. Converter connector (Fig. 8) get into call state. The η relay kf 1 .... kfn speak via the same circuits of the "η normally open contacts kc2. But only one of these ^ / - relays will hold after the relay kc has dropped out. The ^ / - relay closest to the battery will hold through the resistor Re 80. If If this is relay kf 1, it opens the response circuit of relay kc via its normally closed contact kfi / i , which releases with a delay. If relay kc has released , it opens its contact fee 2, and relay kfi, which has picked up, closes .. kfili its own holding circuit via its normally open contact and open about his break contact kfili the holding circuits of the other ^ / - relay so that they fall over kf his work over contact is 1/2, as has already been mentioned, the relay kd on..

The response of the relay kf 1 indicates that the memory of rank 1 "has been brought into ruifposition in each of the p memory groups.

About the working contacts, z. B. kfil6 and kfi / γ this memory in each memory group is brought into call position ^{at the same time to the two 1 converters} TR 1 and TR 2.

Similarly, only one fee relay can hold in each converter. The contact chains of these relays are arranged in such a way that two different memory groups are connected to the converters. The ke ι relay located closest to the battery can thus be held in the converter TR 2 , while the relay ke p can be held in the converter TR ι. Furthermore, these relays interrupt the response circuit of the relays that have the same rank and are located in the other converter.

The system described in this way therefore allows to set up two calls at the same time. It is therefore in the general description it has been assumed that both converters are free.

From the preceding description it can be seen that if one of the converters is busy, the calling memory is served by the other converter, since the / eg ^ relay of the is occupied Converter is in rest position; no fee relay des relevant converter can therefore respond.

If both converters are busy, their feg relays are in the rest position and none. Memory can operated so that the calls are put on hold. As has been shown no call is held for a long time because the converter is occupied for a very short time.

As has been mentioned, the converter is triggered as soon as the memory relay, which is in the Converter used to match the transmitter relay for the dialing code, addressed. to have. the

609 550/170

I 8058 VIII a / 21a ³

The converter is triggered by the fall of the storage relay rf , which opens the occupancy circuit of the converter via its contact rf ι ■. For some reason it can happen that the memory relay rf does not drop out. But since the converter has to be triggered anyway, there is a time chain in the converter, consisting of three relays trt, tru and trf.

ίο The assignment of the converter is characterized by the pull-in of the relay try, which marks it as "occupied" and closes the following circuit via its normally open contact try2 : earth, try 3, normally closed contact tru i, upper winding of the relay trt, battery. The relay trt picks up after a delay because its lower winding is short-circuited by the normally open contact try S. It should also be noted that the lower windings of the other timing relays tru \ md trv are short-circuited by the normally open contacts try 4 and try 6. The three timing relays are therefore delayed on and off.

If the relay rf has not dropped out after a certain time, the relay trt responds . Via its normally open contact trt 3 and the normally closed contact trv ι it closes the response circuit of the relay tru, so that the relay tru responds with a delay.

The relay tru picks up after a certain time. Via its normally closed contact tru 1 it opens the response circuit of the relay trt, which drops out with a delay. It prepares the response circuit of the relay trv via its normally open contact tru 1 and its own holding circuit via its normally open contact tru 3.

If the relay trt has dropped out after a certain time, it closes the response circuit of the relay trv via its normally closed contact trt 2.. Earth, make contacts try 3 and trui, break contact trt 2, upper winding of relay trv, battery. The relay trv responds with a delay because its lower winding is short-circuited.

When the relay trv has picked up, it opens with its normally closed contact trv 1 the response and holding circuit of the relay tru, which drops out with a delay.

It closes its own holding circuit via its normally open contact trv 2.

When the relay tru has dropped out, SO 'it closes the response circuit of the relay trt again via its normally closed contact tru 1, which responds for the second time with a delay.

When the relay trt has responded for the second time, the relay tru is in the rest position and the relay trv is held. If the converter is not yet released from the memory at this time, causes the contact combination consisting of the stationary contacts tr1 4, trv 3 and the working contact tru 4, the separation of the holding circuit of the relay kbi kb ^ of Umrechnerverbinders, so> that these Relay drop out and also bring the relay trx, which occupies the converter, to drop out. The relays kb also cause the relays tra-trj to drop, which may still have picked up in the converter. The relay trx causes the relay tpgd-tpad, which may still be energized, to drop out; after the holding circuit of the relay try has been opened, it drops out again and causes the relay kg to respond via its normally closed contact try 1, so that all the relays of the converter have reached their original position again.

The converter is completely released by the time relays trt, tru and trv, which are quickly returned to their starting position by opening their response circuit and removing the short circuit in their lower windings using the try relay.

If the S ρ ei rather relais rf has dropped out before the second pull-in of the memory relay, the converter is triggered in the normal way; the try relay then drops out and causes the relays trt and tru or the still energized relay trv to drop quickly.

It can now happen that the calling subscriber dials a call number that is not connected. In this case, the converter does not send out any dialing code or company code. It is therefore not triggered in the usual way by the memory, and its time relays trt, tru and trv pick up .

If the relay tru has responded and trt has dropped out, the circuit for. "Number not connected" prepared. A wire is led from the distribution terminal nu via the toroidal coils, which correspond to the special services to which the calling subscriber is to be connected. It is optional to connect the calling subscriber to a reference point or to send him a special busy signal, which identifies a call number that is not connected.

When the tube TZ ignites, a discharge surge is sent into the circuit for "phone number not connected" and the following circuit is closed: earth, induction coil Se 80, capacitor CiiSo, make contacts tr ζ ι and trx ι, wire 838, make contact tru2, break contact trt 1, Terminal nu, toroidal coils. . ., Earth.

The converter is then triggered in the manner already described.

The following describes the call connection of the calling subscriber Ab with a "special service".

It is assumed that the "special service" is identified by the two digits P and Q.

When a subscriber picks up his handset, he is connected in a known manner to the district memory ENR (Fig. 4, 5, 6, 7) and receives the official signal. He therefore dials the number of the "special service", which is received by the memory and registered in a known manner. As in the previous case, this number is sufficient to determine the line in the group selection facility that leads to the relevant "special service". Therefore only one elective level is necessary in the opposite

550/170

18058VIIIa / 21a ³

sentence to the general case previously described, where two elective stages are required.

After the second digit has been stored, the converter is assigned in a known manner and sends only two dialing codes necessary for group selection.

From the distribution point of the converter, where the wire 844 corresponding to the selected prefix PQ ends, a wire is routed via the toroidal coils FA, FB, GA, GB and GE ; this causes the relays tpfa, tpfb, tpga, tpgb and tpge as well as the storage relays eo, er, ev, ex and so on to respond in a known manner.

The activated relays eo and er indicate that the converter is sending out two preliminary indicators, and the relays ev and ex that no digit is being sent out. The relay so is the starting relay.

The converter also sends two tags which are held by the storage relays eia and eja ; the latter determine the group of lines that lead to the relevant "special service". The relays eia, eja are attracted in the manner described by the response of the corresponding converter relays tpda and tpea in that a wire is passed through the toroidal coils DA and EA .

After the memory has received the two identifiers that are necessary to establish the connection and the relay has picked up in this way, the indicators for the group selection can be sent out will.

As in the general case, this takes place in that the normally open contact so 2 closes the circuit for the relay si. The relay si responds and applies its normally open contact ^ 14 earth to the c-wire of the seeker CHER in order to bring the feeder bridge in the group selection device into a ringing state. The recipient of this device then responds in a known manner by grounding the fr'-wire, whereby the relay sj is energized.

The relay sj then, as described, starts the tapping chain through the pulse relays se, sf and the counting relays pr and ps .

The actuated relays eia and eja close their working contacts eia ι and ejai and hold on to the earth of contact ac 4.

At the moment when the tapping chain starts, the relays are ex, ev, he and in the storage chain z. B. the relays eia, eja, epa and eqa operated. The following circuit is closed via the earth of contact ac 4: earth, normally open contact ac4, wire 408, normally closed contacts st 3, syi, sqi, normally open contact so 4, wire 703, cable 712, wire 703, normally closed contacts rs 3, ps2, normally open contact eo2, Normally closed contact p0 2, wire 606, normally closed contacts pu 4, pe 4, pd 3, pq4, pm 3, wire 504, closed contacts pj 4, ppj, normally open contacts er 5, eoS, relay pi, battery, so that the relay pi picks up .

Once the relay pi has raised, it closes its own maintenance circuit via its normally open pi 1 and opens via its break contact pi 2 the holding circuit of the relay davorliiegenden. As already described, it also closes via the normally open contact . Response circuit of the relay sa '.

The relay sa picks up and sends, as is known, a positive pulsating current via the a'-wire to the receiver of the group selection device.

In a known manner, the relay pi has prepared the response of the relay pj via its normally open contact pi4; this circuit is closed as soon as the relay ps is actuated after the relay se has dropped out.

After the relay pj has responded, it holds itself via pj ι and opens the holding circuit of the relay p via pj 2, so that it drops out.

If the relay se has picked up, the relay pj closes the response circuit of the relay sa via its normally open contact pj 5, since it has been assumed that the relay has responded eja .

The relay sa sends the second number required for group selection.

About his work contact PJ4 and the earth of contact ac 4, the following circuit is after the relay has dropped ps, closed: earth, open contact ac 4, already described circuit break contact ps2, working contact eo 2, Normally Closed po 2, already described circuit wire 504, normally open contact pj 4, relay / '/', battery. Relay pp responds and closes the following circuit via its make contact ppg parallel to the response circuit of relay pp : circuit already described. , Make contact ppg, wire 505, make contacts «3, possibly wire 705, relay sq, battery. The relay sq picks up and causes the relay pp via its normally closed contact sq 1, likewise the other still energized storage relays, with the exception of the digit storage relay, to drop out.

When the relay sq responds , the end of the selection process is indicated.

From this point on, all switching processes take place, which lead to the release of the occupied switching elements, in the manner previously described.

It can now happen that the number of the desired special service contains three digits.

All switching operations when dialing and when registering the digits in the memory take place in a known manner. The converter is also used as soon as the digit Q has been saved.

As already shown, the digits P and Q are saved by the converter relays traaJd and trbald. The switching points that correspond to this special prefix PQ as well as all incomplete VoT digits are z. B. summarized on one terminal g 1 of the distributor RP. In this case, the close relay trbaltrbd about their contacts trbald τ to trbald 4, which are summarized in the pyramid pyramidal tract, the response circuit trf the relays and trfA so> that this relay wear.

Via its normally open contact trf 1, the relay trf closes the following circuit: battery, resistor Re & oo, pyramid Py4 from rank 1 to 4, contacts of the relay traa. . . trad, core 826, multi-

609 550/170 '

18058 VIII a / 21a ³

repeatedly switched to ten contacts 1 trf ι, trf parallel to ten relays, wire 834, terminal g 1 and g 'of the distributor RP, wires 901 and 900, relays tph, trx make contact?>, Earth, is tph operated whereby the relay.

The relay tph shows that the converter needs a third digit to be able to set up the connection.

The relay tph closes a holding circuit for the busy signal relay try of the converter via its normally open contact tph2. The following circuit is closed via its work contact tph τ : earth, work contacts tphi, kl · 3/3, wire 816, cable 824, wire 816, break contact rg2, relay rg, battery so that the storage relay rg picks up . This enables the relay rg to revive a converter after storing the third digit.

As soon as the relay rg has responded, it closes its own holding circuit via its normally open contact rg 1 and the common earth of contact ac 4. Via its break contact rg · 2 it opens its response circuit and via its break contact rg · 3 it opens the response circuit of the relay rf, which drops out. Via its normally open contact rg 3, it again prepares a new response circuit for relay rf . Via the normally open contact rg - .: | the response circuit for the relay rh is prepared.

After it has dropped out, the storage relay rf releases the converter relays kl · ils, which continuously trigger the converter; this release also takes place in a known manner, namely the holding of the 'relay try by normally open contact tph 2 and also the other holding circuits of the relay in question have the purpose of releasing the relay try only in the last switch position of the converter, ie as soon as all converter relays are in the rest position.

The third digit (M) dialed by the calling subscriber is retained by the memory, which, when its relay rm picks up, indicates that the memory has been saved. The relay rm again prepares the response circuit of the relay rf via its normally open contact rm 7.

The storage relay rh speaks about the following

Circuit on: earth, normally closed contacts kl 1/3 and kai / T ₁ , wire 602, normally closed contact rf 1, normally open contact rg-4, upper winding of the r / i relay, battery.

If the relay has responded rh , it closes its own holding circuit via its normally open contact rh ι and the common holding earth.

It closes the following circuit via its normally open contact rh 2: earth, normally closed contacts so 1 and sq8, wire 711, normally closed contact esi, normally open contacts rmj, rh2, and rg 3, ^ relay rf, battery. The relay rf picks up again and triggers the switching processes in the converter connector CTR , which are used to occupy the converter and in a known manner

60. lead to the sending of the digits P, Q and M to the converter.

The digit M is stored in a known manner by all or part of the relays ema ... emd.

The latter then cause the actuation of all or part of the relays trca / trcd via circuits already described.

One or more of the trca / trcd relays respond. The contacts of these relays are arranged in a pyramid Py 6, which has ten outgoing wires 829. These wires lead to ten relays trg, which correspond to the ten possible thousands digits. A relay trg , which corresponds to the number M selected by the subscriber, picks up via this pyramid.

As soon as the relay has responded rtg, it closes a normally open contact trg 1.

After the converter has received all the signals that are necessary to establish a connection, it causes the various relays corresponding to the connection establishment in question to be actuated in the manner already described. For this purpose the distribution terminal α 3 is connected to the terminal a ' 4 and from there via the normally open contact trg ι to the terminal &i; from the terminal bi a wire is led over the toroidal coils corresponding to the relays to be energized.

The further course of the switching processes and the release of the memory take place in a known manner Wise.

The various special cases that arise when connecting can occur with a special service are the same as they are described for a local call have been.

However, another special case can occur when connecting to a special service.

It can happen that a calling subscriber is fed through the busy feeder bridge and that of the special service through his connection line. In this case, the wire corresponding to the service in question is passed through the toroidal coil FD . This toroidal coil belongs to a gas discharge tube TFD, which causes the converter relay tpfd to pick up after a discharge has passed. The relay can tpfd again the memory relay et via the wire d of the cable CH 2 responsive.

The relay et closes its own holding circuit via its normally open contact et 2. It short-circuits the resistor Rg via its normally open contact et 1 and applies direct ground potential to the c'-wire of the memory seeker CHER (FIGS. 6 and 7). This ground potential at the c'-but brings about the direct connection of a calling subscriber to the connection line of the special service, but the subscriber in question is always fed through the feeder bridge.

It can now be that the memory bridge is only the direct connection of the calling party with the special service without making any supply which through the Connection line of the special service is provided.

In this case, the converter causes the storage relay ez to pick up in a known manner.

550/170 '

/ 8058 VIIIaI 21a ^e.g.

After the relay ez has responded, it closes its own holding circuit via its normally open contact ez 2 and the common holding earth. It grounds the i'-wire via its working contact ez 1; in conjunction with other feed bridge relays, this interrupts the power supply to the chain in front of the feed bridge and creates a direct connection between the subscriber and the connection line.

After triggering, these relays et and ez, like the other relays, drop by opening their holding circuits, ie removing the common holding earth.

The structure of a district call will now be described, and it will be assumed that the end office belongs to the same system as the exit office. These two offices are so close so that pulsating currents are used for the signals required to establish the connection can. The end office is exactly the same as the exit office, so that it is a group selection facility, which requires two dialing codes, and a subscriber selector, the three Dialing code required, contains.

All the switching operations that the calling party connect to the memory, which is the storage of the number of the called subscriber and cause the converter to be occupied by the district memory, take place in the already described way. '

However, the connection setup differs from that of a local call.

A first group selection is used in the exit office to determine the direction of the remote office. When this direction has been found, a signal is sent over the outgoing trunk to the remote office to inform that the dialing codes are given over two instead of three wires (</, V instead of a ', b', c ') ; the way of choosing is, as far as the sending of the dialing number is concerned, the same as the choice already described for the local call.

The outgoing memory then sends the dialing codes necessary for dialing the subscriber to the end office. These indicators consist of all or part of the digits M, C, D, U.

As soon as the digits P and Q of the number of the called subscriber have been stored, the memory occupies a converter, as already described.

From the input terminal of the distributor RP, which corresponds to the prefix PQ , a wire is led over predetermined toroidal coils of the converter, which sends out certain characteristics or signals that enable the connection to be established by actuating the corresponding storage relay.

In this case, the converter sends:
i. An operating identifier that tells the memory that it must send two preliminary identifiers before the digits M, C, D, U; these are translated into the actuation of the relays eo and er;

2. an operating code which is evaluated by the relays ey and ev being activated and indicates that the end office is of the same type as the exit office. The actuation of these two relays informs the outgoing memory that it must send two dialing codes to the remote office to control the group dialing level and three dialing codes to control the line selection level; these dialing codes are only a function of the digits M, C, D, U;

3. the indicator for picking up the starter relay like this;

4. the indicator for the removal of the ringing current, which is evaluated by the response of the storage relay ez. As has already been carried out when calling a special service, two transmitted indicators, z. B. by the relays eia and ejb stored.

As with a call to a special service, the recipient of the group selection stage, as soon as he is ready to receive the pulsating current signals for group selection, applies ground potential to the &'wire, so that the relay sj is energized. This relay causes the tapping chain to be started in a known manner, starting with relay pi.

The identifiers stored by the relays eia and ejb are sent out with the aid of the relays pi and pj .

The relay pj then prepares via its normally open contact />;' 4 the relays /) /) and pm are activated . After the group selection device of the exit office has received the two required identifiers, it interrupts the &'wire, so that the relay sj drops out and the tapping chain is switched off.

It is now assumed that the group selector finds a free line in the direction indicated by the two received tags. This line is connected to an outgoing connection line via a feed bridge. The storage tank itself is connected to the outgoing connection line via the feed bridge and group selection level. The outgoing connection line then applies positive potential to the c-wire. This closes the following circuit: positive potential on the c wire, working contacts ν ι and ac 3, wire 407, rectifier Rd 74, upper and middle winding of the relay sn in series, earth, so that the relay sn responds.

The relay sn thus indicates the occupancy of a connection line to a remote office that belongs to the same system as the exit office and to which the digits are sent directly as coded pulses.

The relay sn closes its own holding circuit via its normally open contact sn 1 and its lower winding. It short-circuits its high-impedance middle winding via its normally open contact sn2 and informs the outgoing connection line that the transmitted pulse is correct

609 550/170

/ 8058VIIIq / '2Ia *

has been received. The following circuit is closed via its make contact snj : earth, generator Ge 3, rectifier Rd 72, resistor Re 72, break contact sj 4, make contacts sJ3, sn $, break contacts sgi, sai, sbi, sq4, make contact ν 4, wire α '. This positive pulsating current enables the incoming trunk of the remote office to get to its group dial level in the ringing state.

If the recipient of this group selection level can receive the potential he needs, he sends a ground potential via the iZ wire to the outgoing memory. In a known manner, this potential causes the relay sj to respond, which causes the tapping chain to be resuscitated, as already described.

The switching processes when these dialing codes are sent to the remote office, which from this moment on progressively play in the outgoing memory, are completely the same as with a local connection. The group and line selection takes place in the remote exchange, but under the control of the memory of the exit exchange. The connection between the calling party and the called party takes place in the same way as for a 'local connection'. The switching processes that are triggered by the excitation of the relay ez have already been described above.

The various special cases that have been described for a local connection apply even with a district connection, if the remote office is part of the same system as the exit office heard.

However, some special cases that have not yet been explained can be added will.

In those cases where the different directions have a detour, the terminal αϊ of the distributor RP is not connected directly to the toroidal coils, but to a terminal rf'3 of the distributor RP ; the terminal in question is connected to a contact tr j ι, which is used when it is not necessary to set up the connection via a detour line; if a detour line is needed, the terminal with contact tr? 1 connected. The terminals e or e ' are then connected to the corresponding toroidal coils.

In the case of a detour connection, after the first group selection, if all direct lines to the remote exchange are busy, voltage is applied to the &'wire, which indicates that a detour connection is required. This closes the following circuit: voltage on wire b ', normally open contact ν5, normally closed contacts sqS, se 2 and sd ^, rectifier Rd 76, left winding of relay st, resistor Re 77, normally open contacts so 3 and ac 4, earth, so that the Relay st picks up.

The relay st closes its own holding circuit via its' working contact st 1 and its right-hand winding. The c'-wire is interrupted by its normally open contact st 2, as a result of which the switching elements occupied in the group selection stage 'are released. Via its normally closed contact .rf 3, it separates the common holding earth from the pickup chain and the memory ER , which means that all relays in the pickup chain, as well as the license plate memory relays and operating license plate relays, drop out. Via its normally open contact st 6 , it takes the earth from the c-wire so that no counting pulse is sent out when the detour connection is established. Via its normally open contact st 4 it closes the following circuit: earth, normally open contact ac 4, wire 408 , normally open contact st 4, wire 700, normally closed contact rf 7, relay eed, battery, so that the relay eed responds.

If the relay has picked up eed , it closes its own holding circuit via its normally open contact eed 4 and the earth of contact ac 5; In addition, the following circuit is closed: known circuit, wire 815, cable 824, wire 815, normally open contact kb 3/2 of the converter connector, relay tr ed, battery. The relay tr ed of the converter is activated and indicates that it is a detour connection,

If the relay trx responds, the relay tr? also operated via the normally open contact tr ed ι instead of the relay, fr /, which is only required for a direct connection.

The relay tr?, Which marks a detour connection, closes its normally open contact tr? 1.

From the terminal of the distributor RP, which corresponds to the prefix PQ , a wire is connected via the normally open contact tr? ι to point e ' and passed on via the corresponding toroidal coils. The connection is then further established in the known manner.

It can now happen that for reasons such. B. concern the establishment in the exit office two group dials are necessary.

In this case, the converter sends four instead of two pre-identifiers, whereby the memory relay it and four relays, e.g. B. ega, eha, eia and eja, are operated. That of the relay it received operational flag tells the memory that four election signs must be sent out. The identifiers saved by the first relays ega and eha are used for the first group selection; the next two, saved by eia and eja, are used for the second group selection. The digits are then sent out in a known manner.

The following example describes a district connection to an ordinary subscriber, who belongs to an office that is not of the same system as the exit office.

It is assumed that in the remote office the dialing is effected by number pulses and that the called subscriber is selected by the receipt of the digits M, C, D, U.

As in the case previously described, there is generally only one group vote in the exit office necessary to search for an outgoing connection line to the end office. This office

550/170

/ 8058VIUa / '2Ia ¹

however, causes the election in a different way than the exit office, and it is therefore no longer possible to send out the dialing numbers used in the exit office.
The outgoing connection line must therefore, in conjunction with a suitable device, convert the coded pulses into decadic ones.

If the prefix PQ has been registered in the exit office, the memory occupies a conversion calculator in a known manner.

After receiving the prefix PQ , the converter sends the following dialing and operating codes to establish the connection:

1. Two characteristics that cause the Speieher relays eo and er to pick up. These relays indicate _; that two prefixes are sent out to control the local group dialing level.

2. Two marks that are used to suit z. B. the relay eia and ejb lead.

3. The company identification to send out four digits; this is evaluated in the memory by actuating the relay ex,

4. The indicator for removing the call current by pulling in the relay ez.

5. The reason Plate (crank signal), which is evaluated by the response of the relay so on.

The relays ey and ev are not activated and thus indicate that the end office belongs to a different system than the exit office.

The tapping of the two identifiers stored by the relays eia and ejb causes the group selection in a known manner, after which the memory is connected to an outgoing connection line.

After completing this group selection, the relay pp responds via the normally open contact / 74. This relay pp closes the following circuit parallel to its own response circuit: normally open contact / '/' O.,, Wire 505, normally open contact ex? ,, normally closed contact evi, relay pm, battery, so that relay pm picks up, but relay pp immediately how - · which drops out because its holding circuit has been opened by the normally closed contact pm 2.

When the outgoing connection line and the equipment connected to it are ready to receive the coded pulses corresponding to the digits M, C, D, U , earth potential is applied to the £>'wire, thereby actuating the relay sj and on in a known manner the reassignment of the tapping chain is effected progressively from the relay pm on.

As is known, the relay pm and then the relays pc, pd, pu send those corresponding to the digits M, C, D, U. License plate off; the relay sq picks up when the units digit has been sent out.

The connection, the disconnection of the feed bridge and then the triggering are already carried out described way.

It is noted that the disconnection device, characterized by the relay sh, is designed so that the digits M, C, D, U can only be transmitted as they are stored,

In an end office of this kind, it is not necessary to wait until the last digit has been saved in order to send out the three digits C, D, U,

All the special cases described earlier can also be used in the same way as the one just described Fall.

It may now be the case that the called subscriber is not directly connected to the remote office is, but that the latter serves as a transit office. .

The order of the switching operations is exactly the same as has been described, however instead of four digits, six digits of the called subscriber's number are sent out as * they have been received.

If the outgoing trunk does not determine the charge itself, it is a Counting device required.

In this case, the converter responds by sending out a supplementary identifier for the corresponding company identifier. The converter therefore sends out three codes, which are stored by the relays eha / d, eia / d, eja / d , with the go code stored by the relays eja / d representing the counting code.

Then, as already described, the digits are sent out.

Now it may also be necessary to use the class identifier. As has already been stated, the class identifier in the Umreohner causes a relay trealc to respond and then a relay tri. In a known manner, it is sufficient to connect the distribution terminal corresponding to the selected prefix to the circuit leading via the normally open contact tri 1 and then to lead a wire over the toroidal coils that correspond to the dialing and operating codes and are necessary for establishing a connection. It follows that the establishment of a connection does not only depend on the number dialed, but also on the class; this arrangement is used in particular when the subscriber has a restricted operation. ± 10

The connection setup for a national call will now be described with reference to FIGS. 4 to 11.

When the calling subscriber picks up his handset, he is connected in a known manner to the district memory ENR after his class has, if necessary, been stored in the memory ER.

After the participant has received the official signal and a conversation about the country level wants to lead, he chooses a special number, e.g. B. 16.

As soon as this first prefix has been registered in the district memory, a converter is used evidenced, which by sending out a company code replies to the concerned

609 050/170

/ 8058 VIIIal21a ³

To cause memory to occupy a country memory finder CHEN.

In a known manner, the memory seeker CHEN searches for a state memory and connects it to the district memory.

This state memory essentially contains only one tap and one identifier memory chain, which are similar to the chains of the canton store.

ίο The state memory is therefore an auxiliary memory of the district memory, which is only partially used during the connection setup. In In fact, this state memory only registers the outside line prefix of the called subscriber while the number of the called subscriber is recorded by the district memory.

It should be noted that the telephone number for a national call consists of eight digits, which form two specific parts: the prefixes A, B ₁ P, Q and the actual numbers M, C, D, U. The national memory also receives the prefixes A, B, P ₁ Q through the receiver RE and sends the identifier transmitted to it by the converter through a transmitter EV to the district memory ENR .

The special number 16, which characterizes a national call, is recorded in a known manner in the memory RE and indicated by the relays rp, rq picking up .

The converter TR is then occupied by the district memory and receives this prefix. The converter then actuates the relays eo, he and es in the relevant district memory, which are held by contact ac S via the common earth. Furthermore, the converter also causes the relay ez, which is used to switch off the ringing current, to respond.

The three relays eo, he and it open the response circuit of the BeIegungsrelais rf for the converter via their normally closed contacts ι, which is thus released in a known manner.

The following circuit is closed via the working contacts er2 and es 2: earth (Fig. 5), working contacts he 2 and es 2, normally closed contacts ex 1 and rs τ, starting wire M of the state memory seeker CHEN. Via their working contacts he 3 and es 3, the relays he and es prepare the response circuit of the relays rr and nrj.

After the state memory seeker CHEN has been started in this way, it searches for a state memory ENN in a known manner. A free memory is characterized by voltage on its test wire never and ground potential on the chain wire next.

As soon as a free state memory has been found, the magnet V of the seeker CHEN closes its contacts, so that the state memory is connected to the district memory via the seeker CHEN.

The following circuit is then closed: earth in the district memory, make contacts he 3 and es J ,, break contact ex2, relay rr, wire 524, contact t of the individual switch CHEN _t sequential changeover contact nrq2>, right winding of the relay nrj, battery, whereby the district memory relay rr and ' address the national storage relay nrj in series.

In parallel to the response circuit of relay rr , this relay closes the following circuit via its make contact rr 7: earth, make contacts he 3 and es 3, break contact ex 2, make contact rry, relay rs, battery, so that relay rs picks up.

When this relay is activated, the allocation of the state memory is indicated by the district memory. Via its normally closed contact rs ι it opens the starting circuit of the state memory connector and via its normally closed contact rs 3 the response circuit of the pick-up chain relay of the district memory. The response circuit of the two counting relays of the district memory is opened via its normally closed contact rs4 and the response circuit of two similar counting relays in the state memory is prepared via its normally open contact rs 4. It closes its own holding circuit via its working contact? 5.

The allocation of the country memory is indicated by the activation of the relay nrj. Via its normally open contact nrj 1 , the relay nrj applies the common holding earth of the storage relays and closes a holding circuit for the magnet V of the seeker CHEN. The common holding earth of the license plate and the pick-off relay is applied via the normally open contact nrj 2. Via its work: contact nrj 2 , relay nrj closes the response circuit of relay npx via its upper winding. In order to send the subscriber an indicator that he can dial the actual number of the called subscriber, the following circuit is closed by the normally open contact nrj4 : generator Ge 4, capacitor Cd 100, normally closed contact nraj, normally open contact nrj4, contact t of the switch CHEN, wire 524 , Normally closed contact rw3, normally open contact rp 7, wire 400, capacitor Cd 40, normally closed contact ad i, middle winding of relay aa _t earth. This sends the character for further dialing to the calling subscriber, as described.

After the relay npx has picked up, it marks the state memory as occupied. It never opens the test wire circuit via its normally closed contact npx τ and the chain wire circuit nch via its normally closed contact npx 2t . The subscriber then dials the number of the called subscriber A, B, P, Q - M, C, D, U.

In a known manner, these digits are received in the receiver RE by the receiving relays ag-am and coded by the device CD 2.

To simplify the description, it is assumed that the number dialed consists of the digits M4-A 2 25-70. '

The first stored digit (M) corresponds to six pulses. The table set up when describing the local connection shows that these six pulses characterize wires A and D.

The following two circuits are then closed:. ,

550/170

I8058VIIIa / 21a ^s

I. earth, normally open contact ac \, wire 409, coding device CD 2, wire A, cable 401, wire A, normally open contacts rp2, rq2, rrj ,, wires 522a and 526, contact α of switch CHEN, normally closed contacts npe ^, npvi, cable 1000, wires A and 1008, normally closed contact nra2, relay neaa, battery;

2. Circuit already described, wire D, normally open contacts rpS, rq5 and rr6, wires D and ι ο 14, normally closed contact ηταζ, relay nead, battery.

The relays neaa and nead respond and, through their combination, identify the coding that corresponds to the first digit (A) of the dialed number.

These relays hold themselves on the common ground of the contact nrj 1 and cause the relay nra to pick up, in order to indicate that the storage of the digit A of the call number has been completed.

About his work contacts nra2-nra $ enables the relay nra, as described before, storing the number B through the relay neba-nebd. Via its break contact nra J , the relay nra in the state memory opens the circuit for sending the character for further selection.

The number B, which corresponds to four dialing pulses, is indicated by the marking of the C wire. It follows that the state memory relay Nebe the corresponding digit of the B relay, which causes the tightening of the relay nra at the end of storage of the digit in question.

Via its working contacts nrb 2-nrb 5, the relay nrb prepares the circuits for the storage of the digit P by the relays nepald , and via its working contact nb 7 it closes the following circuit: earth, break contact nroi, make contact nrb 7, break contact nrgs, relay nrf, battery.

The relay nrf picks up and causes the converter to be occupied by the country memory. The number P corresponds to two dialing pulses which, after coding, cause the relay nepb to pick up. This relay then causes the relay nrp to respond in a known manner, which marks the end of the storage of the digit P.

The number Q, which also corresponds to two dialing pulses, is saved via the normally open contact nrp 3 by the relay neqb.

The relay neqb responds, causes the relay nrq to pick up and thereby marks the end of the storage of the digit Q.

As already described with the local connection, the relays close nra. . . nrq, equal to the relay rp. . . ru, its own holding circuit via its first contact and the common holding earth and a holding circuit for the relays, which store the digits A, B, P and Q, via its sixth contact.

Via its sequential switchover contact nrq 2, relay nrq opens the response circuit of relay nrj. Via its normally open contact nrq 3, it switches the high-resistance left winding of the relay nrj in series with its pull- in winding and thus closes the circuit again. This switching process causes the relay rr in the district memory to drop. '

As soon as the relay rr has dropped out, the actual subscriber number of the call number can be recorded in the Bezirksspeichef ER , and the normally closed contacts rr ^ -rr 6 switch the wires A, B, C, D through again in the memory. Relay rr opens the response circuit of relay rs via normally open contact rrj, which continues to hold ^1. The digits M, C, D ₁ U dialed by the calling subscriber are stored in the same way as has been explained in the general description of the local connection. As soon as the one digit has been saved, the relay ru responds and switches on the generator Ge 2 via its normally open contact ru3 , which sends a waiting signal to the subscriber via a circuit already described, which informs the person concerned that the call number has been correctly saved. Through its normally closed contact ru / \. the relay ru separates the receiving relays in the receiver RE from the impulse line.

As already mentioned, the relay nrf of the country memory picks up as soon as the first two digits (A and B) of the prefix have been saved.

This relay controls the search and then the allocation of a converter by the country memory.

The switching operations when assigning this converter are completely the same as with a local connection.

It is also noted that the switching operations in the converter as well as when sending the specific Optional or company codes are the same as in the previous cases. The only difference is that the converter works through the country and not through the District storage is controlled.

It is assumed that the converter with the first two digits (A and B) can set up the connection to the district office. The prefix A and B is thus sent to the converter; the coding corresponding to digit A causes the traa ' and trad' relays to operate, while the coding corresponding to digit B causes the trbc 'relay to pick up. These relays, in turn, cause certain relays trfa 'to pick up in a known manner. The wire 843 leads from the contact trfa ' 1 of the activated relay trfa' to the terminal «2 of the distributor, which corresponds to the prefix AB. For conversion, this terminal is connected to the corresponding toroidal coils to which the relays are assigned that must be energized in order to be able to establish the connection. These relays are operated as in the previous cases.

The following table shows the relays that are made to attract, depending on the situation the connection is established:

609 550/170

18058 VIIIal21a ³

Prefix Actuated
relay Sent
sign Actuated
relay 5 · 4 marks
2 -
6th neo
ner 4th
3
2
I '
O nes
net
net and nes
nev

In the event that the number requested by the subscriber is not connected, the converter sends a signal which causes the relays net and nev in the country memory to pick up.

Furthermore, the converter causes, in a known manner, the actuation of the starter relay nro in the country memory, regardless of the number of selected selection or operating identification relays.

After the relay nro has responded, it opens the response circuit of the relay nrf with its break contact nro 1, so that it drops out. The latter also causes the converter to be released. Via its normally open contact nro 1 , it closes the following circuit: earth, normally open contact nro τ, normally closed contacts -npe 3, nps2, npoi, npq4. . . npa? ,, wire 1002, normally closed contacts npi4. . .nphj ,, relay npf, battery, which picks up relay npf. The relay nro closes the following circuit via its make contact nro 2: battery, lower winding of the differential relay npr, break contact npsi, make contact nro 2, contact i of switch CHEN, wire 525, break contact rt2, lower winding of relay rt, earth, so that the Relay red responds. The relay npr does not pick up due to the high resistance of the lower winding of the relay rt . Relay nro closes its own holding circuit via its normally open contact nro 5.

To simplify the description, it is now assumed that a single group selection is sufficient to determine the remote office; the converter then sends two prefixes, which are translated into the relays ner, nejb and neka. The relay ner corresponds to an operating code, the relays nejb and neka to the preliminary code in the country memory. It is assumed that six digits P, Q, M, C, D, U are to be sent out as received; the state memory itself sends out two of them _; and the converter then causes the state memory relay net to respond.

Under these conditions, the relay npf drops out, since its holding circuit has been opened by npj2, without having caused anything; the closing of the normally open contact ner 2 also causes the relay npj to respond. After the relay has picked up npj , it prepares the tapping of the z. B. by the relay nejb stored first coding and transmission by the country memory.

The relay npj closes its own holding circuit via its normally open contact npj 1. With its normally closed contacts npj Z and npj 4 , it opens the response circuits of the relays in front of it. Via its normally open contact npj4, it prepares the response of the relay npk to pick up the second coding and send it out by the country memory. The transmission of the first coding to the license plate relay of the transmitter EV is prepared via its working contacts npj 5 to npj 8. . ·

As soon as the relay has responded rt , it closes its own holding circuit via its normally open contact rf i. It opens its response circuit via its normally closed contact rf 2, and via its normally open contact rf 2 it switches this circuit via wire 500 and normally open contact rs4 to the earth of normally open contact se 7. The two counting relays of the national storage facility npr and nps are connected to the timing relay se and sf of the transmitter EV connected. Via its normally closed contact rf6, the relay rf removes the holding earth of contact ac 4 for the selection and operational identification relay and replaces it with the earth of contact rf 4. Via its normally open contact rf 8, it closes the response circuit of the transmitter relay .

If the relay has responded in this way , it causes the relay si to pick up, and the switching processes when picking up and sending the two codes through the country memory to the receiver g _{0 of} the group selection device of the office in question run like a local connection.

In fact, the transmitter connected to the state memory works in the same way as with the district memory. Furthermore, the relay pairs se, sf, npr and nps as well as se, sf, pr and ps are the same in their mode of operation.

In the state storage facility, this is implemented in alternating grounding of wires 1016 and 1017, so that the pick-up chain can switch correctly.

The signals from the country memory relays are sent via the wires Ai, Bi, Ci or Di, cable 1001, contacts αϊ, δι, ei, di of the switch CHEN, cable 520 to the wires Ai, Bi, Ci, Di , which are respectively those in the country memory correspond and which all or parts of the relay sa. . . allow sd to excite. The license plates are transmitted from these relays in a known manner.

When the second identifier has been sent out by the country memory, the relay npp is actuated via the normally open contact net 1 , whereby the digits P and Q of the call numbers are sent out.

Once these are sent out, the earth is placed on working contact nro 1 to the relay npe so that it attracts ^one over the working contact npq4.

The relay npe thereby marks the end of the 'election. Via its normally open contact npe 1 it closes its own holding circuit, and through its normally open contact npe 2 it causes the relay npq to drop out. With its normally open contact npe 3, the relay npe removes the earth potential from the pickup chain, ie it interrupts the response circuit of the relay npf-npo. About his break contact npe 4 is the conductor A.

550/170

/ 8058 VIIIal21a *

interrupted for digit storage, and via its normally open contact npe 4 the relay closes the following circuit: earth, normally open contact npe 4, contact α of switch CHEN, wire 526, cable 522, wire 517, normally closed contact rr 1, normally open contact rs6, wire 817 b, relay ex, battery, so that the relay ex in the district memory responds.

After it has picked up, the relay ex controls the transmission of the last four digits (M, C ₁ D, U) of the dialed telephone number that has been recorded in the district memory.
. Via its normally closed contact ex 2 , the relay opens the response circuit of the Landesspeicherrelais nrj and the holding circuit of the relay rs, so that both relays drop out. Via its normally open contact ex 2 it closes the following circuit: earth, normally open contacts er 3, es 3 and ex2, wire 502, normally closed contact ev S, relay pm, battery, whereby the relay pm responds.

As soon as the relay nrj has dropped out, it takes away the two common ground potentials via its working contacts nrj ι and nrj 2 , so that all relays still energized in the state memory drop out. The country memory is completely triggered.

When the relay rs has dropped out, it puts back through its normally closed contact 'rs 3, the ground potential of the contact ac 4 to the relay of the tapping chain of the district memory. Via its normally closed contact rs4, it re-establishes the connection between the counter relays pr and ps and the pulse relays se and sf . The tapping chain of the district memory then begins to tap from the relay pin to the relays, which store the digits M, C, D and U and are sent to the remote office.

As soon as the last digit has been sent out, the relay sq picks up and applies the a ' and &' wires of the seeker CHER to the relays sm and sp in a known manner.

If the called subscriber is free, the relay sm causes the connection. If the called subscriber is busy, the relay sp causes the busy signal to be sent to the calling subscriber.

+5 In both cases the release takes place as before described.

The special cases that can occur when establishing a connection to the state level are now described.

■ In the preceding description it has been assumed that the digits A and B are sufficient to set up the connection. It can now happen that four digits are required for the exchange code in order to set up the connection to the remote exchange.

Under these circumstances, after receiving the digit B, the converter works as described and causes its relay tph to pick up. The latter applies ground potential to wire CH3 ', which is connected via cables 824 and 824η, wire. 8i6w ends at the national storage relay nrg . The relay nrg responds and works in exactly the same way as the district storage relay rg, causes the relay nrh to respond and the converter occupancy relay nrf to drop. The converter is then released.

The exchange code is registered in the state memory up to the number Q, which corresponds to the end of the storage of the desired prefix and is identified by the activation of the relay nrq.

This relay then closes the following circuit: earth, break contact nro 1, make contacts nrq ζ, nrh2 and nrg 3, relay nrf, battery, so that the relay 'nrf responds again and the assignment of the converter TR by the country spei rather causes. The converter responds by sending out an operating code, which is received in the memory by the relay neo . The activation of the relay neo indicates that four pre-identifiers are being sent out. Furthermore, the converter causes all or part of the relays neka-nekd, neja-nejd, neia-neid and nehanehd to be activated.

The stored characters are then picked up and sent out in the manner previously described; the relay nph is the first relay in the pickup chain that picks up.

It may now be that setting up a connection requires the converter to send six prefixes or prefixes; this is initiated by applying earth potential via the group of wires Ti to T 6 to the state storage system. Since none of the relays eo or he is activated, npf is the first relay in the pickup chain to respond.

Depending on the distance to the remote office called, it is necessary to send four to eight unconverted digits. In the present case, the country memory must send out 0 to 4 digits or codes. If the state memory does not send out any digits, the relay net responds and, regardless of the number of prefixes sent, causes the relay npe to respond after the relay npk has picked up, which in all cases shows the transmission of the last dialing code. If the dialing codes are sent out by the state memory, this is marked by the relay npe and the sending of the digits recorded in the district memory is initiated. If the state memory sends a digit that has not been converted, the relays net and nes pick up and trigger the relay npp after the last dialing code has been sent out.

The relay actuates npp through its normally open contact 10, the relay npp npo via the following circuit: soil working contact nro 1, npe break contacts 2, NPS2, npo 1, npq. 4 . ., Normally open contacts npk4, net i, npp το, nes'2, relay npo, battery. The relay npo responds and puts through its contacts npo 1 and npo 2 the ground potential of the wire 1016 ah the wire 1017, so that the relay npq picks up .

When the relay npq has responded, the relay npp drops out and, in the present case, causes the relevant digit to be picked up and sent by the country memory.

609 550/170

I8058VIIIa / 21a ^s

Where it is necessary to send three digits, only the national memory relay nes is activated. In a known manner, the first two digits are picked up by the relays npb and npp and the third digit Q by the relay npq . However, since numbers are not emitted by the character A, the relay has caused npa the response of the relay npo. As a result, as already described, the wires 1016 and 1017 are reversed, so that the relay npa drops out before a digit A can be transmitted.

If the country memory sends out such a number,

so none of the relays es, et, ev and er are activated.

As soon as the last prefix or prefix has been sent, the pick-up chain continues uninterrupted and the relays npa to npq respond again. The relay npe picks up at the end of the selection and triggers the switching processes in the district memory in the manner described above.

It may now be the case that if all direct lines to the remote office are busy, a detour is provided. As in a district call, the relay st in the district memory picks up.

As soon as the relay st has responded, it closes its own holding circuit via its normally open contact st 1. It opens the circuit of the c'-wire for the currently occupied group selection device via its normally closed contact st 2 in order to trigger it. Via its normally closed contact st 3, it opens the holding circuits of the selection and operating indicator relays of the memory as well as the tapping relays; however, the service flag relays are still held by contact Π4 to ground. On its normally closed contact st 5 interrupts it in the state memory, the core C 1 for the transmission of the coded mark and defines with its working contact st 5 a positive voltage to the relevant Ci vein that a bypass line is used to the state memory to communicate, wherein the Response of the relay npt is initiated . The following circuit is then closed: positive voltage, resistance Re 50, make contact st 5, wire 532, contact ei of switch CHEN , make contact c 3, rectifier Rd 100, left winding of relay npt, earth, so that relay npt responds.

As soon as the relay npt has picked up, it closes its own holding circuit via its normally open contact part. Via its normally closed contact npt 2 , it opens the holding circuits of the various license plate memory relays T2-T6, the operating license plate relays neo and nev, the pick-off chain relays npf-npo and the relay nro in the Landes Speicher. It closes the following circuit via its normally open contact npt 2: earth, normally open contacts nrJ2 and npt2, relay npn, battery, which actuates the relay npn. The relay npn is an auxiliary relay for a detour connection. It closes its own holding circuit via its normally open contact npn 2. Via its normally open contact npn 1, it prepares the activation of a detour connection relay in the new converter.

As soon as the relay nro has dropped out, it causes the relay npt to drop out by opening its holding circuit via the normally open contact nro 3.

The relay npt drops out and, via its normally closed contact npt 2, again prepares a common holding earth for the operating identification relays, the identification memory relays of the tapping chain and for the starter relay.

As has been stated, in the case of a detour connection, the switching processes for the selection are repeated in a known manner, and the following circuit for the converter relay tr ed is closed as soon as the state memory has occupied a converter again: earth, normally open contact npn i, class wire 815 n, cable 824 n, cable 824 (Fig. 5 and 6), wire 815 rf in Fig. 8, normally open contact kb 3/2, relay tr ed, battery. As soon as the relay tred has responded, it triggers the switching processes corresponding to the detour connection for the conversion. ■

If the number dialed by the calling subscriber is not connected, the converter sends the dialing code together with the corresponding company code to a special service to be connected to the subscriber. In the country memory, the converter causes the relays net and nev to pick up.

When the fourth digit Q of the country code has been saved, indicated by the actuation of the relay nrq, and when the signals for the group selection have been sent, indicated by the pick-up of the relay npe, the following circuit is closed: battery, relay npv, normally open contacts nrq 4, net 4, nev4, npe ζ, earth, so that the relay npv responds.

The relay npv marks the connection of the calling subscriber with a special service. As soon as this relay has responded, it interrupts its normally closed contacts npv 1 and npv 2, the A and -5 wires, via which the prefix is registered in the state memory, and grounds it via its normally open contacts npv 1 and npv 2, which means In the district memory, the relays ev and ex address via the normally closed contacts rr 1 and rr 2 and via the normally open contacts rs 6 and rs 7 .

As has already been stated, the simultaneous response of these two relays characterizes the District memory establishes a connection without sending digits. In the present case it is a special service.

It may now be the case that the choice has been made after the license plate has been sent out by the state memory are, does not lead to the goal. After a certain period of time, a timer is started that initiates a new election attempt.

The transmit relay controls se, as described, the gradual handover of Abgreifkette and. Sending out the election numbers. In the state memory, the relay se is actuated by the counting relays npr and nps. If the relay se responds, ie while a dial number is being sent out, only one of the relays npr and nps has picked up . During a transmission break, if that

550/170

18058 VIII a / 21a ³

Relay se is in the rest position, either both relays npr and nps are activated or both are in the rest position.

When the relay is actuated nro after starting and when by the relay rt, the transmission relay has likewise as mentioned, pull the district memory sz relay and the relay state memory nrz after the first passage of the cam Cb ι on. So that this switching device

ίο works exactly, the district and state memory must be connected to the same cams Cb ι and Cb 2.

During the pause of the dialing code, the relays sz and nrz are held in both memories. As can be seen, the relay sz maintains itself via the normally closed contact sf 3. The relay nrz maintains itself via the common earth and the following circuit: battery, upper winding of the relay nrz, normally closed contact nrk 2, normally open contact nrz r, changeover contacts npr τ, and nps 3, when the relay se is in the rest position, and earth via normally open contact nrj2. . ·

If sz after the passage of the cam Cb 2 relays and nrz still energized and no flag has been sent to speak the District memory relay sy over the working contact sz 2 and the country's storage relay nry over the working contact nrz 2 on.

When the relay nry has picked up in the state memory, it closes its own holding circuit via its normally open contact wry 2 and opens the holding circuit of the license plate memory and operating code relays via its normally closed contact nry 1, as well as the holding circuit of the pickup chain relay. The state memory then occupies a converter again to make a new dialing attempt.

As can be seen, the relay sy with its normally closed contact sy 2 interrupts the conductor in the district memory and thus triggers the group selection stage.

However, keep rt 4, the aforementioned operating characteristics relay via the earth potential of the working contact in the District memory because her other holding circuit rt through the normally closed contacts 6 has been interrupted and sp ι.

The selection in the state memory can thus start again from the beginning.

However, as in a district call, the calling participant receives a second unsuccessful call Attempt to dial the busy signal.

As already pointed out, the country memory is released as soon as the digit Q has been sent; the district memory sends the four digits of the actual subscriber number.

The relay rs in the national register is then brought into the rest position, but the relay rt still remains energized; the relay sx is then via the earth potential of the contact ac 5, normally closed contact

60 ' rs 2, normally open contact rt 5 and its right winding energized. If a mistake is choosing the relay sends sx. the calling subscriber the busy signal after the cams Cb 1 and Cb 2 have caused the response of the relay sz and sp. In this case, no new dialing attempt can be made when the state memory is triggered.

As has been emphasized, the converter cannot perform its function until the digits A and B of the outside line access code have been saved. But it can happen that one of the tapping relays npp or npq responds before the corresponding digit P or Q has been saved.

If the digit P has not been saved under these circumstances, relay npr is still in the rest position and the following circuit is closed: earth, normally open contact nrji, normally closed contact nrp 6, normally open contact nppg, relay nrk, battery. Here the relay nrk responds .

Relay nrk separates wire D 1 from the state memory via its normally closed contact nrk 1 and closes the following circuit via its normally open contact nrk 1: positive voltage, resistance Re 102, normally open contacts nrk 1 and ν 4, contact d ι of switch CHEN, wire 533 , Cable 52od, wire d, normally closed contacts pm8, pc8, pd8 and pu8, wire D 1, wire 708, wire D ι in the transmitter, normally closed contact se 6, left winding of the relay sh, rectifier Rd JJ, earth. The switch-off relay sh of the transmitter responds in order to prevent the transmission of go pulses by the relay se by opening the normally closed contact sh 1, as already described. Furthermore, the relay nrk opens the circuit via its normally closed contact nrk 2 via the right winding of the relay nrz in order to prevent it from being held. If the dialing of the digits for the call number is delayed, the cams Ca 1 and Ca 2 come into action.

One could e.g. B. provide several detours for the connection establishment if all direct ioo lines are busy. The case has already been dealt with where only a detour was planned. It can now happen that all lines of this first detour are busy. If there is a second detour, battery voltage is applied to wire b ' and thus, as already explained, the relay st is energized. In this case, the memory ER would have to contain a second relay eed , not shown, which responds. 'The first relay eed is held, indicating that the first detour has been checked.

The second relay, such as B. eed, causes the transmission of a signal to the converter, which indicates the second detour, after it has responded. The converter then sends signals similar to those sent out for the first detour. Other detours can also be provided, which can be checked in the manner already described, specifically in a specific order, until a free line for establishing the connection is found.

It would also be possible to provide a system with more than six digits, which is the outside line code with a different number of

609 550/170

18058 VIII al 21a *

Converts digits, sends out other converted digits and a different coding for the transmission the various selection combinations.

. ■ '

Claims (18)

Patent claims: ι. Circuit arrangement for telecommunication, in particular telephone telephone systems with main memories, auxiliaries and converters for establishing connections between different traffic levels, characterized in that a calling subscriber after occupying a main memory (district memory _t ENR in Fig. Ι to 3) by dialing an elimination number an auxiliary memory (Country memory ENN in Fig. 2) occupied and after receiving a prompt for further dialing ■ dials the target exchange code and then the subscriber number and that the target exchange code is recorded from the main memory and transferred directly to the auxiliary memory for storage, while the subscriber number is stored in the main memory he follows. 2. Circuit arrangement according to claim i, characterized in that the target exchange code recorded by the auxiliary memory is converted by a converter (CTR in FIGS. 1 and 2) optionally assigned to the auxiliary memory and returned to the auxiliary memory. 3. Main memory according to claim 1, which consists of a receiver, memory and transmitter, characterized in that the transmitter is tapping the recorded in the auxiliary memory Controls the indicator and evaluates it for the establishment of a connection, 4. Auxiliary memory according to claim 1, characterized in that this after receiving the Target office code makes switching means effective, which the main memory for receiving the Arrange subscriber codes. 5. Auxiliary memory according to claim 4, characterized in that it is released, as soon as the previously stored code is accessed by the transmitter in the main memory warden is. 6. converter according to claim 2, characterized in that it is designed in such a way that it works with memories of different systems (e.g. decadic or undecadic). .7. Converter according to Claim 6, characterized in that that this converts the conversion processes depending on the system of the Memory, the class of the calling party (pay phone, party line, etc.) and the required exchange code. '8th. Converter according to Claim 7, characterized in that it is triggered by the memory if the code numbers are incomplete and ^{sends a signal back to the memory, SO 1} that the latter cannot use a converter until it has recorded the complete code number. 9. Converter according to claim 8, characterized in that it is found when all direct lines to the connected memory gives a signal which causes the latter to to trigger the connecting elements already set in the main direction and the for the main direction stored license plate, whereupon the memory dem Converter enters the exchange code again and the latter to the connected memory sends back the license plates converted for the next detour. 10. Converter according to claim 9, characterized in that that it is busy when all lines in the first detour direction are found and a further detour direction is available sends a signal to the memory, which causes similar switching operations to the Change of direction from the main direction to the first detour direction. 11. Circuit arrangement according to claim 1 to 10, characterized in that if the delay is too long or the subscriber code is not dialed After dialing the outside line code (timer), the auxiliary memory is triggered and the transfer is carried out of the busy signal to the calling subscriber. 12. Circuit arrangement according to claim 1 for rearranging input variables into predetermined output variables, characterized in that that a plurality of coils with ferromagnetic cores, each of which has several primary windings and a secondary winding carries, is wired in such a way that with each rearrangement of an input variable into the output variable corresponding to it, a number that characterizes the output variable Coils are magnetized via one of their primary windings and via the Secondary windings act on evaluation switching means. 13. Circuit arrangement according to claim 12, characterized in that each input variable has a current path for magnetizing Coils is assigned, which from the series circuit each have a primary winding of those Coils is formed, which characterize the output variable assigned to the input variable. 14. Circuit arrangement according to claim 13, characterized in that toroidal coils are used. 15. Circuit arrangement according to. Claim 14, characterized in that each of a series connection of primary windings .vifferent Toroid coil existing current path is designed as a jumper line, which through the toroidal cores of the relevant output 550/170 / 8058 villa size characteristic number of toroidal coils is performed. 16. Circuit arrangement according to claim 15, characterized in that the toroidal coils are arranged in a coordinate manner. 17. Circuit arrangement according to claim 16, characterized in that the output variables are identified in coded form. 18. Circuit arrangement according to claim 12 or one of the following claims, characterized in that the output variables with The help of the gas discharge tubes assigned to the individual coils, which are arranged to be ignited by a voltage surge induced in the secondary coil. Considered publications:
French Patent No. 965 185;
Bell Lab. Rec, 1951, pp. 62 to 68. In addition 6 sheets of drawings © 609 550/170 7.56