DE1156119B - Circuit arrangement for telecommunications, in particular telephone systems, in which the connection paths are checked for their occupancy status - Google Patents

Description

The invention relates to a circuit arrangement for telecommunications, in particular telephone systems, in which the connection paths before the effective connection of connections on their Occupancy status (free or occupied) by test switchgear, ζ. Β. Relays, transistors or the like. Be checked.

In the known arrangements of this type, the test switching means are located in front of their connection to the connection path to be checked in a certain switching state. B. fallen off, which you change to mark the absence of connection paths after you have passed them Connection paths are switched on; Test relays speak z. B. at. To change the state of a To be able to bring about test relays in free connection paths, the free connection paths must also be charged with potential. This is particularly important in the case of intermediate line systems made up of relays a link relay for each link.

There are also known circuits for rotary selectors in which when searching the outputs not - as is usually the case - that the outputs are checked for voltage, but for the absence of voltage. A test relay short-circuited during the test speaks when it is reached a free output via an internal, i.e. not via the selector arm, to the switching element being tested running circuit. However, this has the disadvantage that in the event of a fault, the one Line interruption in the test wire results in all rotating over this disturbed line Check voters there and stop and that with the help of test relays between free state and Failure of a line cannot be differentiated because the test relays respond during the test and either a change of state thereof or the evaluation of a state maintenance the test relay for the purpose of giving an acknowledgment would not be possible without additional switching means.

The object of the invention is to avoid the disadvantages and the complexity of the known arrangements. This is achieved by the fact that test switching means connected to the connection paths indicate the free state of their connection path by remaining ineffective during the test process and thereby initiate the connection of a connection and give an acknowledgment that the occupied connection path was previously free when the connection path changes.
In an arrangement according to the invention, circuitry for telecommunication,

in particular telephone systems,

in which the communication paths on their

Check the occupancy status

Applicant:

Siemens & Halske Aktiengesellschaft,

Berlin and Munich,
Munich 2, Witteisbacherplatz 2

Dipl.-Ing. Georg Freymadl and Günter Edler,

Munich,
have been named as inventors

a free connection path, e.g. B. an intermediate line, not with a characteristic of this state Potential to be occupied. The test switching means gives by its change of state after switching through the connection an acknowledgment that the connection path was actually free and not an error, z. B. broken wire was present on the line or the test wire. The intermediate lines of intermediate line systems no longer need to be equipped with intermediate line relays that have a »free potential« Connect to the test wire. The response of test switching means after switching through effecting potentials can be in the facility to be occupied, z. B. Relay kit, input of the subsequent voter or coupler, to be switched on when occupied.

An exemplary embodiment of the invention is shown in the figures.

Fig. 1 shows a block diagram of part of a centrally controlled system, and

FIG. 2 shows the switching elements of two couplers that are essential for understanding the invention Choice levels and a central setting set for these couplers.

The subscriber TN of Fig. 1 is connected via his subscriber circuit TS to a coupler of the subscriber selection level TW , which like a double

309 729/74

operating selector works and is set by a setting kit ES-TWITGW , which is also used to set the incoming upstream coupler of the subscriber group selection level TGW . The participant TN is reached arriving via a line KL, which has access to a relay set RB , which is upstream of the participant group selection stage TGW and, among other things, serves as a food additive for the arriving participant TN . The subscriber group selection stage TGW is designed as a two-stage switching network with the switching stages KSi and KS 2 for incoming traffic. In the coupling stage KS 2 , however, there are also crosspoints via which the coupler of the subscriber selection stage TW connected to it via intermediate lines ZL receives access to an outgoing occupied relay set RA. The relay set RA is followed by an input EGW to the next selection level GW , which is controlled by a setting set EGW. An outgoing line GL or the line KL can be reached via the option level GW, for example.

In FIG. 2, the auxiliary wires c, d of the intermediate line ZL connecting the subscriber selection stage TW with the subscriber group selection stage TGW are shown. It is assumed that an outgoing connection is to be set up by the subscriber station TN (FIG. 1). By lifting the handset at the subscriber station, an incentive is given to the subscriber circuit TA and via this to the setting set ES-TWITGW . The link test relays, e.g. ZP%, are connected to the link lines to be tested, e.g. B. ZL, switched on. Since there is no potential on wire c of the assumed free intermediate line ZL , the status of this intermediate line ZL is marked by the intermediate line test relay ZP1, which does not change its state. Responding link test relays, on the other hand, hold themselves until the setting set ES-TWITGW is triggered via its own contact, the relay shown ZFl via its contact lzpl, in order to prevent a change in the identification of the link state during the setting time.

At the same time as or after the link test, the test for free relay sets RA or free inputs EGW for group selection level GW can be carried out. For this purpose, test relays Pl, ..., PlO are provided in the setting set, of which the test relay Pl checks for the indicated input EGW of the group selection level GW. The test relays Pl, ..., PlO are now switched as in known test circuits so that they change their state when they check for a free input EGW. However, even if the EGW input is free, they cannot respond if the intermediate lines ZL that have access to this input are occupied and if the intermediate line test relays, e.g. ZPl, respond and open their response circuits with contact 2 zpl.

The test relay, e.g. B. Pl, the first free input EGW in the group selection level speaks on its winding I, closes a holding circuit with its contact IpI via its winding II and at the same time prevents further holding circuits from becoming effective.

After these test processes, which can be followed by a check on the selector input EGW , the marker relay M of the first free intermediate line that has access to a free selector input EGW is energized via contact chains of the relays ZP and P. In the case under consideration - free intermediate line, ZL, free selector input EGW - the marker relay Ml is excited via the contacts 2pl, 3zpl. It continues through its own contact ImI and marks with its Konig clocks 3ml, 2ml the coupling relay KU to be switched on of the subscriber selection level TW and the coupling relay Kll / 2 to be switched on of the second coupling level KS 2 of the subscriber selection level TGW. The latter initially responds via contact 3ml and a common marker contact g and, by closing its coupling contacts, connects, among other things, its coupling contact 1 & 11/2, the wire c of the intermediate line ZL with the relay set RA. The intermediate line test relay ZPl responds thereupon and gives an acknowledgment that the intermediate line ZL was previously free. A common acknowledgment relay PQ is brought via its contact 3zpl, which switches on the coupling relay KIl of the subscriber selection stage TW marked on the contacts 2 ml of the setting ES-TWITGW and IES of the subscriber switch TS with its contact lpq . When the coupling relay ZIl responds, the coupling contact Ik 11, among other things, is closed. After the setting set has been triggered, the coupling relays hold themselves through their windings II in the c-core.

Claims (2)

PATENT CLAIMS: 1. Circuit arrangement for telecommunications, in particular telephone systems, in which the connection paths before the effective through-connection of connections to their occupancy status (free or occupied) by test switching means, eg. As relays, transistors od. The like., To be checked, characterized in that on connected to the communication paths (ZL) Prüfschaltmittel (ZPL) identified by their disabling remaining during the scan to idle its connection path (ZL), and thereby initiate a connection, the through-connection and give an acknowledgment for the previous vacancy of the occupied connection path by changing their status when switching through. 2. Switching arrangement according to claim 1, characterized in that the test switching means (ZPt) is assigned a common acknowledgment switching means (PQ) which effects the effective through-connection of the connection. Considered publications:
Fritz Hahn, Circuit Book of Telecommunications, Volume II, 1942, p. 173. 1 sheet of drawings