DE826455C - Circuit arrangement for long-distance switching systems - Google Patents

Description

Circuit arrangement for toll switching systems The invention relates to on long-distance switching systems with several superimposed network levels exchanges combined in groups with dial-up operation and memory, especially for telephone systems. In such long distance switching systems result face difficulties when the total number of from an exchange in different Directions outgoing lines the capacity of this switch assigned direction selector, z. B. a district network group selector, exceeds. It is known per se in telecommunications, the lines for large groups to be distributed to two parallel voters and the incoming one through a special criterion Switch line according to the required voter. But that means that every incoming line must be assigned two voters and thus one in most cases an unacceptably high cost. arises.

Another option that cannot accommodate a normal voter Reaching lines consists of adding a second direction selector to the first direction selector Subordinate voter and convert the number to set this second voter. The number of these second voters can be adapted to the respective voter needs, however, each of these voters must have a memory for receiving and converting the call number received for the direction elimination. The effort required for this is therefore also very high. In addition, in such an arrangement, the restoring the The time required to establish the connection increases, which is avoided in long-distance traffic shall be. .

The invention provides a circuit arrangement for directional selectors specified in long distance switching systems of the type mentioned above, which the above avoids the disadvantages described.

This is achieved in that the absorption capacity of the Elector's transgressive Total number of in different directions foreseeing lines two direction selectors are connected in series and the Setting the downstream voter by transmitting a special direction number from the memory of the first voter.

The advantage of the invention is that almost twice the number of the lines normally accessible via a voter in an election level can be without special memory and tap selectors for the subordinate voter are needed. The time it takes to set the downstream voter is also reduced, since only a single direction number is transmitted for this must be, through which this voter is immediately set. The need for voters for the subordinate voter is thereby the respective traffic conditions without further adapt.

An exemplary embodiment of the invention is shown in the circuit diagram. The example is based on simple rotary selectors, to which, however, the invention is not limited. Only the first district network group selector is shown with the memory and tap selector assigned to it, insofar as it is necessary for understanding the invention, as well as the control circuit for the subordinate district network group selector. This directly set additional selector was not shown, since the structure and mode of operation of such a selector can be of any known type. Of course, this selector is also provided with all the additional facilities that are characteristic of a Netzgruppen.wähler of the system described above, such as search time limitation, reversing to detour direction and reverse triggering.

When the district network group selector is occupied by the local office, relay A responds via both speech wires in parallel. Relay A opens the short circuit of the occupancy relay C at a1112, so that C also responds and relocates its contacts. As soon as the first digit of the telephone number indicative of the desired direction, z. B. the number of a specific location of the district network group or the remote office, via which the ascent to the higher network level takes place, is transmitted, relay A follows the incoming pulses and transmits them via +, c 111 2, a. 1I, 1 11 2, DZSp, - on the turning rivets of the decimal memory, which is set to the step corresponding to the number of pulses received. At the first drop in A, V was also excited by the removal of the short-circuit of its effect via a 1I relay V, which was maintained during the series of pulses. At the end of the first series of pulses, V drops with a delay and closes via +, v I, dzsp, Zsp 4, 1, - a circuit for relay I, which responds and with its t contact 11I2 switches the switching circuit from the ten storage magnet to the single storage magnet DESp. Relay I remains after it has responded via its own contact 1 I. The second series of pulses now causes the individual memory ESpW to be set by energizing the rotary magnet DEsp in pulses. At the end of this series of pulses, V drops again, as a result of which Tiber +, v 1I, desp, ESp 22, 1I, - relay 1I is energized, which switches off the rotary magnet of the single store with 2 1I 2. With contact 2 I 2 the circuit of the A-relay is interrupted, which however still holds through its own parallel contact III r. This ends the recording of the local number by the memory.

It should be noted here that your exemplary embodiment is the network group wiper of a district network office, which only has a two-digit local number or the two-digit code for the ascent to the higher-level long-distance network Over-the-counter remote exchange is forwarded. However, the mode of action is with one Holiday network group selector with a four-digit local number is completely the same, only it is the memory is designed to accommodate such a four-digit code.

After the memory setting has been completed, a circuit for the magnet of the direction selector DRU 'is closed when relay 11 responds: +, c1, p2 I2, sI2,21111, p111, @ RW, DRW, - The direction selector starts up and searches for the over the arms i of Z.fpW and i to io of the ESpW marked step. Assuming that the participant has dialed the local number 53, then the Zelinersheiclier is on Sc4ritt 5, the Einerspeicher on Sclir-itt 3. With this setting there is a connection via voter arm i of ZSpW and 5 of ESpTU 'finit step d in that of contact arm d of the RIV swept over the contact track. In this step, the direction selector is stopped by the response of the test relay P i, in that the P i relay with its contact pi 1I interrupts the switching circuit of the rotary magnet DRW and switches over to the rotary magnet DFW of a free selector FW downstream of the direction selector RU '. The number 53 is thus converted into the direction number .1 and the direction selector is set to the contact arm set (abc) d of the subordinate free voter, to whose contact bank the lines continuing in the direction, 4 are connected, which direction the location 53, possibly in addition to other locations , is achieved. The free selector FW now selects a free line from the bundle of lines going out in this direction. The switching circuit for the selector magnet DFW runs as follows: +, c I. p 2 I 2. s 1 2, 2 III 1, p 1 1I, r5 FU ', DFW, -.

When checking for a free line, indicated by a minus in the outgoing transformer, the test relay P 2 responds: 4-, c III i, pi I, s HI 2, P 2, c-arm from RW, c 4-type from FW . . ., - in the outgoing transformer.

P 2 responds and blocks the line found against double occupancy in a known manner by short-circuiting the high-impedance P 2 winding. By moving p 2 I 2 , the selector FW is stopped at this step. Relay S is now excited via the speech wires in parallel connection: in the outgoing transformer.

Via +, RU, pa III 2, u 3 III 1, s I 1, J, - the pulse relay is now switched on in the circuit of the interrupter RU and excited in pulses. Due to the periodic Umschalteis the contact i 1I, the pulse circuit leading to the outgoing transformer via the selector RW and FW is also periodically interrupted and an excitation circuit for the rotary magnet DAg of the tap selector is closed. The tap selector is incremented and first scans the setting of the decimal memory ZSpW via a contact arm 3 while simultaneously sending a corresponding number of pulses via the continuing line: +, arm 3 of ZSpW, arm 3 of Ag, u 1 1I, c 11I, Pa (1, 2), -.

If Ag reaches the step to which ZSpW is set, relay Pa responds and interrupts the pulse circuit at pa III 2 and the incremental circuit of the tap selector magnet at pa I.

Relay PA stays above + after it has responded. Pa (5/6), pa 11I, U 1, u 2 I, o 1 2, W (2, 6), -. In this circuit, relay U i is also excited, which is held via +, c III 2, dfw, s II, u 3 1I, u 1 III i, -. Immediately after Pa has responded, the tap selector runs further into its rest position via the following self-interrupting circuit: +, A9 d (1 to ii), dag, v III, pa I, DAg, -. As soon as Ag reaches the rest position, Pa (5, 6) is short-circuited via the contact arm 4 and drops out. As a result, the yaw pulse circuit and the incremental circuit of Ag are switched on again.

Since, however, relay U r is now also excited, the contact arm 2 of Ag is switched into the test circuit, and the setting of the single memory selector ESpW is checked. When checking the step identified by the contact arm 21 of ESpW, the relays Pa speak in the circuit +, U 2 (1, 2) ESpW 21, Ag 2, u 1 1I, c III 2, Pa (1, 2), - and 17 2 on. Pa has the same effect as described above. Since the steps of the memory selector and tap selector with the same number are always connected to one another, the digit recorded by the memory, e.g. B. 53, has been passed on unchanged.

By the response of 17 2, which is held over +, c I, p 2 I 2, u 2 1I, U 2 (5, 6), -, the pulse receiving relay A from the incoming line at u 2 III 1 and u 2 III 2 separated. With contact u 2 I, the short circuit of the winding of the U 3 relay is canceled, which is now switched into the holding circuit of the Pa relay and responds.

U 3 is held over +, c 111 2, dfw, s II, u 3 1I, U3 (5, 6), -, and switches through the speech lines with u 3 12 and u 3 III 2. This establishes the connection to the next exchange. It is now further assumed that the call number of a location is selected that cannot be reached via the direction selector shown, but only via the downstream dialer, e.g. B. the number 95. All these places are grouped in the direction selector in one direction, expediently on the last contact. Via this contact and the contact arms a / b / c io of the downstream free selector - in the example chosen here with ten-part rotary selectors - ten downstream directional selectors are reached, to whose contact bank the line bundles that cannot be picked up by the first directional selector are connected to the aforementioned further ones Lead exchanges. The connection with this downstream direction selector and its setting are carried out in the following way: By transmitting the call number 95 on the part of the caller, the memory is set in the same way, as already described above, and the direction selector is started after it has been set. As soon as this comes up to the contact marked via the memory selector, the following test circuit is established: +, contact arm i from ZSpW to step 9, contact arm 9 from ESpW to step 5, o (1/2), contact arm d from RW to step 10, 1 11 1, P 1, -.

In this circuit, the relays P i and o respond, the latter being held over +, c III 2, w I, o 11, o (5/6), -. The other contacts of the o-relay are not yet effective, but are only used to prepare various circuits. The setting of the RW is now followed again by the selection of a free line by the selector FW from the bundle accessible via the contact arm set (15) selected by the direction selector, which leads here to the downstream additional direction selector. After finding such a selector, relay P 2 responds again and stops the free selector FW.

In order to be able to determine the direction from the memory of the first direction selector to which the additional direction selector must be set in order to reach a line continuing in the direction of the desired office, the phone numbers of all locations accessible via the additional direction selector are wired between additional contact paths of the memory selector (ZSPW 2, ESpW ii to 2o) and a special contact path of the tap selector (Ag i) are converted and the converted number for setting the additional selector is transferred to it.

The scanning of the memory setting and the forwarding of the stored phone number via the voice wires, which normally follow the 'setting of the FW, is therefore' prevented in this case initially 'by on the one hand the test relay Pa by moving the contact c 111 2 from the switching arms 2, 3 of the Tap selector Ag off and switched to the switching arm i of this selector and, on the other hand, the circuit for the current impulse transmission at c I1 2 is interrupted. In addition, at c 11 1, a pulse circuit to a contact arm of the selector FW is closed in preparation, to whose associated contact track the control lines for the rotary magnets of the additional direction selector are connected.

When the test relay P 2 responds, the following circuit for the impulse relay I is closed: +, RU, pa 111 2, u 3 III 1, p 2 I 1, o 111 i, J, -. Relay J is energized in pulses and switches the tap selector step-by-step via +, i 11, pa I, DAg, - with simultaneous transmission of setting pulses for the additional direction selector via +, a I 2, p 2 III 1, i 11I, o 1I 1, Contact arm c from FW,. . ., - in the additional direction selector.

If the tap selector reaches the step identified by the memory for location 95, in this case step 3, relay Pa speaks to +, contact arm 2 from ZSpW to step 9, contact arm i9 from ESpW to step 5, contact arm i from Ag to step 3, o 111 2, Pa (1/2) -.

Relay Pa stays above +, Pa (5/6), pa III, o 12, W (1/2), W 2/6), -. The relays U i and U 3 normally contained in this circuit are now short-circuited by contact o 12. For that now is a. Relay W switched on, which also responds and is held by its: own contact w I and winding 5/6 with simultaneous separation of the holding circuit for relay o. Furthermore, since relay o (1/2) is short-circuited by wIII, relay o drops out with a delay, whereby the control circuit for the additional direction selector at o II i is interrupted. (However, this circuit is maintained for the time being via contact w II, which at the same time bridges the pulse contact i III.) At o 11 2 the circuit for normal call number transfer is closed again and the test relay Pa is returned to the contact arms 3 by releasing c 111 2 or 2nd of the alligator selector.

In the meantime, the tap selector has moved back to the rest position in the manner already described, in which Pa is short-circuited, drops off with a delay and, since the outgoing transmitter is now reached via the set additional network group selector and relay S has thus been energized via the speech wires connected in parallel, Again the excitation circuit of the pulse relay I via +, RU, pa lII 2, 113 III 1, s I 1, J, - closes. The other switching processes for the transmission of the stored phone number in unchanged form are the same * as already described above. The series of current impulses forming this call number are now transmitted directly to the outgoing line in the desired direction via both direction selectors in series connection.

Claims (6)

P A T EN T AN SP RCC 11 E i. Circuit arrangement for direction selectors in Fernvermittlutlgssv-stones with exchanges combined in several network levels n: -uppenw-eis @ e with dialing operation and memories, in particular for telephone systems, characterized in that two direction selectors are used when the total number of lines going out in different directions exceeds the capacity of the selector are connected in series and the setting of the downstream selector is carried out by transmitting a special directional digit from the memory of the first selector. 2. Circuit arrangement according to claim i, characterized in that the call numbers of the subordinate Direction selector attainable exchanges are summarized in such a way that when the memory is set to one of these numbers, the same is always the case Direction code results to which the first direction selector adjusts and via which the additional direction selector is reached. 3. Circuit arrangement according to claim i and 2, characterized in that when setting the first direction selector on the additional direction selector switching means (relay o) come into effect which prevent the normally subsequent transfer of the number andarxyour place another Conversion of the recorded phone number into that for setting the additional direction selector effect serving directional number. 4.; Circuit arrangement according to claims i to 3, characterized in that the direction number for setting the additional selector on a special contact path of the pickup dialer used to pass the number (Ag) is marked. 5. Circuit arrangement according to claim ibis4, characterized in that that the converted direction number for the additional direction selector via an auxiliary switch arm (e) of the free wheel (FW) connected to the direction selector at the same time as the The memory setting is scanned by the pick-off selector on the additional direction selector is transmitted and causes a direct adjustment of the same. 6. Circuit arrangement according to claims i to 5, characterized in that after the tap selector has been shut down on the step identifying the direction number for the additional direction selector Switching means (relay W) become effective, which another surge transmission on the additional direction selector and prevent the subsequent automatic number transfer prepare.