DE1007373B - Circuit arrangement for surge receivers in telecommunications systems - Google Patents

Description

GERMAN

The invention is concerned with surge receivers in telecommunications systems. In these plants are Switching commands are transmitted by pulses or pulse series and evaluated in the surge receivers. Use is made of this in particular in telephone technology, where pulse series are used as dialing pulse series used to hire voters. One of the well known ways to get impulses transmitted is that a normally closed circuit is interrupted and pulsed as a result, a relay in this circuit is actuated in time with the interruptions.

In such arrangements working according to the so-called loop system, for example in one Group selector, the impulse relay is energized when it is occupied. Will the loop circuit after that pulsed interrupted, e.g. B. by the expiry of a dial, it will be every time If the impulse relay drops out, the switching circuit for the selector's drive magnet closed and the voter switched one step at a time. One from loop breaks The existing impulse series is converted into effective current impulses in the impulse receiver, i. H. in power surges that trigger or control switching processes.

The known arrangements operating according to the loop system, however, have a disadvantage. If namely the surge receiver, for example again a group selector, by lifting the Handset has been seized and then the handset is replaced, then the impulse relay also speaks in the loop circuit and drops out again when hanging up. When this relay drops out but the voter cannot initially distinguish whether it is a dialing impulse or whether it is a Trip is present. A contact of the falling rush relay creates an effective rush current generated for the voter drive and the voter thus advanced by one step. That remains Impulse relay dropped out, d. H. if the connection is not to be further established, the voter must now run back to its rest position. During the time of the default, the voter stays for other assignments blocked. This fact is particularly important for rotary selectors in large groups, which many groups have to run over uselessly on the home run in order to reach their starting position again.

Arrangements are known in which the disadvantages mentioned are avoided. With these arrangements a complete cycle of dropping out and reactivation of the pulse relay is required in each case, to influence the voter magnet. However, this results in an implementation or a Circuit arrangement

for surge receivers

in telecommunications systems

Applicant:

Standard Elektrik Aktiengesellschaft,
Stuttgart-Zuffenhausen,
Hellmuth-Hirth-Str. 42

Alfred Heyduck, Stuttgart-Zuffenhausen,
has been named as the inventor

time shift of all impulses effective in a voter. Because of this, the well-known Arrangements not useful if there is a requirement that no such shift of the entire series of pulses may take place.

In another known arrangement, the release times of the occupancy and control relay must be special dimensioned, and contacts of these two relays must form a circuit that a prevent the drive means of the voter from taking effect. Furthermore, it is also known to the divert the first impulse of a series of impulses from the voter magnet, i.e. suppress it, and in return the Preset voters on the first line to be dialed.

Even if with these arrangements by occupancy and subsequent re-release of a voter no unwanted power surge is generated and an unnecessary start-up of the selector is prevented, so However, they have significant disadvantages due to the required presetting or pulse shift. The invention avoids all of them Above mentioned disadvantages in surge receivers due to, that with a series of pulses the first effective current surge in the current surge receiver only through the the rush relay is re-energized after the first drop, the subsequent rushes; against it are generated immediately each time the impulse relay drops out.

An embodiment of the invention is explained below with reference to the drawing. In the The drawings are only the circuits necessary to understand the mode of operation of the invention shown. It's a telephone system with two

709 507/158

Claims (4)

Voters Wl and W2 indicated in the connection setup. After lifting the receiver at the subscriber station T, a loop circuit running over the two windings of the relay A is formed in a known manner via the selector Wl. Since these processes are not important for the invention, they will not be discussed in more detail here. As soon as the selector Wl is set, the relay A comes into effect in the loop circuit. The delayed relay V is then switched on via the contact al, which prepares the circuit for the relay VH with its contact ν 1. However, this relay cannot yet respond because it is initially short-circuited by the switched contact al. Via the switched contact v2 and the resistor Wi2, the drive magnet W of the selector W2 receives a pre-excitation which, however, is not sufficient to operate the selector. If the loop circuit is interrupted in pulses by pressing the dial at subscriber station T, then the impulse relay A drops out in time with these interruptions. If contact a 1 returns to its rest position the first time it drops out, relay VH responds immediately. The Kontaktal short-circuits the winding of the relay V, but this relay has such a dropout delay that it remains excited by the pulse train. After the first loop interruption, relay A responds again. The closed contacts vl and al also give the relay VH a dropout delay so that this relay does not drop out during the pulse series either. When the impulse relay A responds again, the selector magnet is excited in the following circuit: +, a2, vhl, d (W), vbl, v2, p2, W, -. Since the selector magnet W, as already mentioned, received a pre-excitation when it was occupied, it can respond immediately and thereby opens its contact d (W). As a result, the 1st winding of the relay VB receives current, so that this relay responds and with its contact vb 1 switches over the switching circuit of the selector. The relay VB continues with winding II via contact vb 3. The first effective current impulse is only given after the impulse relay A has been re-energized on the selector magnet. The next and all further current impulses in a series of current impulses are given to the selector magnet immediately when the impulse relay drops out via the contacts α2 and vbl. As soon as the complete series of impulses has been recorded, relay A remains continuously energized. This causes the relay VH to drop out with a delay. The test can then be carried out via contact vh2. The test process is carried out as usual, so that it does not need to be discussed in more detail here. With the Kontaktpl the blocking takes place, and with the contact p 2 the switching circuit of the selector is separated. If the connection is released again, the impulse relay drops out when the receiver is hung up in the subscriber station T. The relay V is short-circuited by the contact and also drops out. In a manner not shown in detail, the test circuit is also disconnected and the subsequent connection device is triggered. A relay interrupter RU is connected to the voter magnet W via the dropped contacts p2 and v2 and via the head contact k of the voter, which switches the voter into its rest position. As mentioned above, when the selector W2 is occupied, the two relays A and V become effective. If ίο now, without emitting a series of pulses, the loop circuit is immediately interrupted by replacing the receiver, relay A drops out again. In this case, however, it is not possible to influence the selector magnet, since the relay VB, as stated above, has not yet come into effect. The arrangement according to the invention avoids the disadvantages of the known arrangements. This solution is particularly advantageous in that no special switching means are required, but the intended purpose is achieved by using the relays already available for the temporary test. Of course, the invention is not only useful for switching dialers in telephone systems, but can just as well be used with other current surge receivers in telecommunications systems, in order to prevent there that a current surge is erroneously generated in the event of occupancy and subsequent re-triggering, which could trigger any undesired switching processes . Pa ten ta ns ρ η ü c: π f. 1. Circuit arrangement for impulse receivers in telecommunications systems, in particular telephone systems with dialer operation, in which series of pulses are generated by pulsed loop interruptions, characterized in that in a series of pulses the first current surge effective in the surge receiver only through the re-excitation of the surge relay (A) following the first drop, the following current surges, however, are generated immediately each time the surge relay drops out. 2. Scarf processing arrangement according to claim 1, characterized in that switching means (d (W)) of the switching element actuated by the effective current surges (e.g. selector drive W) with the first actuation (in the first step) bring a relay [VB) into effect that performs switching in the generation of effective current surges. 3. Circuit arrangement according to claim 1 and 2, characterized in that when the surge receiver is occupied, the switching element actuated by the effective current surges (eg selector drive W) receives a pre-excitation that is not yet sufficient to actuate the switching element. Considered publications:
German patent specifications No. 259 653, 267 934,
499 793, 918 814. 1 sheet of drawings © 709 50W158 4th ST