DE1132600B - Circuit arrangement for telecommunications systems, especially telephone systems, with callback transmissions - Google Patents

Description

Circuit arrangement for telecommunications systems, in particular telephone systems, with callback transmissions The invention relates to a circuit arrangement for telecommunications systems, in particular telephone systems, with callback transmissions, in which to check the operational readiness or to set the alarm volume from subscriber stations the subscriber's own call number or the last pulse series of this number are temporarily stored and in which the re-transmission of the series of pulses depending on a relay is made, among other things, by an inactive state of the series of pulses Temporary pulse repeater open contact and switching means depends on the transmission of at least the last pulse series up to. for the final signaling delayed by the participant.

In the known arrangements of this type, the opposite of other callback transmissions have the advantage that the number of digits in the call number of the call transmissions in Eligible participants may be different for the delay the transmission of a buffered series of pulses compared to their entry in the recall transmission expended two selector relays, both according to the Number of incoming impulse series can be advanced. The contact banks of both Voters are wired to one another and to an auxiliary relay in such a way that at least the transmission of the last series of impulses before the final signal is given by the calling party Subscriber station is prevented by the auxiliary relay. A contact of the auxiliary relay controls in series with that characterizing the setting of the pulse repeater Contact the relay initiating the transmission of the buffered series of pulses.

The object of the invention is to reduce the complexity of the known arrangement to belittle. This is achieved by being in series with that in the rest position of the pulse repeater opened contact a parallel connection of contacts is arranged one of which is parallel branch through one during the occupancy of the callback transmission Contact opened by a calling subscriber and its second parallel branch is formed by a series connection of contacts, one of which is during each pulse of an incoming pulse series is closed and one of them the other operated by a delay relay and one during the first pulse incoming pulse series is opened and opened until the end of the pulse series remain.

The relay initiating the transmission of the series of pulses is thereby actuated at the beginning of an incoming series of impulses. However, it can occur when running in of the first pulse series do not respond, since the zero position of the pulse repeater contact marking the effectiveness of the series connection of contacts prevented parallel branch formed. The re-transmission of pulse series takes place thus offset by one series of pulses each time, so that after the last one has been stored Impulse series this remains stored until after hanging up the receiver at the subscriber station of the calling and calling back subscriber in the other parallel branch of the parallel connection contact closes. With the invention, the expense of the known Arrangements required selector relay avoided in a simple manner.

In the figure, an embodiment of the invention is shown.

The main switching elements of a callback transmission RU to which a pulse repeater JW is assigned are shown. Incoming callback transmission is achieved via a group selector GW and has access to a call seeker AS, to which it is connected like a subscriber.

When the callback transmission is assigned, the assignment relay C first responds via its winding 1: 1. Earth (in the GW); cgw. . ., 1 t, 2 c, (1) C, - It opens its contact 2 c and thus the short circuit of its winding II. The callback transmission RU is thereby blocked against further occupancy. The relay C continues to hold over: 2. Earth (in the GW), cgw, ..., 3 c, (II) C, (I) C, -If the calling subscriber gives a current impulse, the impulses from the group selector GW reach the Wire agw to the winding I relay A connected to this wire, which switches on the delay relay E with its contact 4 a and influences the one-memory magnet EM of the pulse repeater JW with its contact 5a via the actuated contact 6c. The pulse repeater is set according to the number of incoming pulses. Its contact 10 s 0 is closed when leaving the rest position.

Parallel to these switching operations, a call finder AS is started via the contacts 12 t and 13 c. The call seeker AS adjusts to the step marked by closing the contact 14 c and is stopped there. In the test circuit, the relay T of the recall transmission responds via: 3. Earth (in the AS), cri, T, ..., 14 c, -The relay P initiating the withdrawal of the first series of pulses cannot respond in this switching state, if not the Storage of the first series of pulses in the pulse repeater has already ended, since the energized relay E is delayed so that it remains energized even when contact 4 a is opened during the pulse pauses within a series of pulses. With its contact 16e, the relay prevents relay P from becoming effective.

After the end of the first series of pulses, assuming that the call seeker AS is already set and the relay T is energized, the relay P still does not respond, since the contact 17a opens after the last pulse of this series of pulses before the contact 16e of the switched off relay E at contact: 4 a closes.

When the first pulse of the second series of pulses arrives, the circuit for relay E at contact 4 a is closed again. Furthermore, since contact 17a closes before contact 16e opens, relay P, which initiates the withdrawal of the first series of pulses, now speaks to: 4. Earth, 10s0, 17a, 16e, 181, 19 x, (I) P, - Let it be Mentioned here that the relay P can of course only respond in this circuit when the contact 18 t is closed and thus the state is marked that the setting of the caller AS has been completed. A transmission of impulses before a call seeker is set to the occupied callback transmission is thus prevented.

If the relay P responds in circuit 4, it will hold on to its own contact 20p and the resistor W 1 independent of the contact 16e of the responding Relay E. With contact 21 p a relay J is switched on, which is in a self-interrupting circuit works impulsively.

5. Earth, 21p, 221, T, - The release magnet AM of the pulse repeater JW is excited in pulses via: 6. Earth, 10 s 0, 23 p, 24 i, AM, - If the release arm actuated by the release magnet reaches the release arm operated by the Saving the first pulse series marked point, the contact 26 pk is closed and the relay P is thrown off by counter-excitation via its winding II: 7. Earth, 10s0, 23p, 251, 26 pk, 27x, (1I) P, -The contact 27x belongs to a relay X, which is excited via the contact 28 i when the relay T responds for the first time. The relay X remains after it has responded until the relay P drops out at the end of the withdrawal of the first series of pulses: B. Earth, 29p, 30 x, X, -With each pulse given by relay J, the contact 31 i is the The loop formed via the contacts 33 p, 32 t to the call seeker AS is interrupted and the pulses to be stored are thus transmitted to the group or line dialer following the call seeker AS.

After the end of the storage of the second series of pulses, the parallel When the first series of pulses expires, relay E drops out again and with its contact 16e prepares the circuit 4 for the relay P, which is effective when the first pulse of the third pulse series arrives.

If, on the other hand, the second series of pulses was the last series of pulses to be stored, so their withdrawal will be after the withdrawal of the penultimate (first) series of pulses initiated when the handset is hung up at the subscriber station of the calling subscriber the occupancy relay C drops out by opening circuit 2 in group selector 6W.

With contact 35 c a new circuit for the winding I des Relay P closed: 9. Earth, 10 s 0, 35 c, 19 x, (I) P, -The relay P then conducts the described switching processes for the storage of the still in the pulse repeater stored pulse series.

Since the calling subscriber has dialed his own number, will after saving the last digit corresponding to the last digit of his call number Pulse series from the line selector occupied by the callback transmission in itself called in a known way.

Claims (3)

PATENT CLAIMS: 1. Circuit arrangement for telecommunications systems, in particular Telephone systems, with recall transmissions, in which to check the operational readiness from subscriber stations the subscriber's own call number or the last pulse series of this number are temporarily stored and in which the re-transmission of the series of pulses depending on a relay is made, among other things, by an inactive state of the series of pulses Temporary pulse repeater open contact and switching means depends on the transmission of at least the last series of pulses up to the final signaling delay by the subscriber, characterized in that in series with the in the rest position of the pulse repeater (JW) open contact (10s0) a parallel connection of contacts (35c / 17a, 16e) is arranged, one of which is parallel branch through a while the assignment of the callback transmission by a calling subscriber opened contact (35 e) and its second parallel branch through a series connection of contacts (17 a, 16 e) is formed, one of which (17 a) is an incoming one during each pulse Pulse series is closed and one of which is another (16 e) through a delay relay (E) actuated and opened during the first pulse of an incoming pulse series and remains open until the end of the pulse series. 2. Circuit arrangement according to claim 1, characterized in that the delay relay (E) of the the incoming pulses receiving relay is dependent. 3. Circuit arrangement according to claim 1 or 2 for systems in which the callback transmission call seekers are subordinate to the setting for a callback transmission when it is occupied be started, characterized in that a contact (18 t) is a completed Setting a call seeker (AS) to the requesting callback transmission (R U) acknowledging relay (T) in the circuit of the retransmission of the series of pulses initiating relay (P).