DE2439165B2 - Circuit arrangement for a centrally controlled telephone system, in particular telephone branch exchange, with direct call facility - Google Patents

Description

15th

20th

25th

30th

The invention relates to a circuit arrangement for a centrally controlled telephone system, in particular Telephone extension system, with direct call option and multiple use of direct call buttons, whereby by means of the direct call buttons sowchl an establishment of a direct call connection between an extension and the switching as well as the establishment of other connections under the assumption of others Switching states can be produced.

In known systems is for the connection of the attendant console to the query side and for the A special button is provided for each connection to the switching side.

The object of the present invention ^r > n is to simplify the method and the arrangement for the switching of incoming exchange calls and the establishment of direct call connections by the operator in centrally controlled telephone systems. v>

This is achieved in that, depending on switching means actuated by a mediation measure and by means of switching means which are identified by a direct call subscriber, the marking of the direct call subscriber by the marker for the regular w> connection establishment and an end-of-dial indicator can be initiated in the central control device and thus direct call through-connection via the direct call coupler is preventable.

In this way, the direct call button is used in the course of the ''> Call forwarding used as Speed Dial. This turns the operator into an operator's place without additional effort for a speed dial through the double use of the direct call buttons simplified

In the drawings, an embodiment of the invention is important for understanding Details shown. the

F i g. 1 shows a system overview of a private branch exchange with direct calling; the

F i g. 2 shows circuit details to explain the exemplary embodiment.

From FIG. 1 shows how a call station Nl or the service telephone BF is connected via the single coupler EK, ten coupler ZK and mixed coupler MKH with a free transmission after identification by the identifier Id under the influence of the central control device ZE of the marker and route finder M / WSU . At the transmission, a free selection memory WSp is switched on by the election memory searcher WSp-Su and the path to the desired intercom station N 2 is established with the aid of the election evaluator WBw and the central control device Z £

When dialing an exchange code, the transfer to an exchange transmission takes place in a known manner. Incoming exchange connections are switched through to the desired extension via the exchange coupler MKA, the ten coupler ZK and one coupler EK. Calls arriving at the operator console are forwarded by initiating the exchange and call station marking from the operator console for the purpose of connecting through.

In the case of the system shown, a subscriber can establish a direct call connection to the operator a corresponding signal lamp is switched on at the operator console after pressing the direct call button (see Fig. 2). By pressing the DT button on the operator, the calling direct call participant becomes via activated DLOK contacts with direct call transmission coupled and called. When picking up the handset, he is via the direct call coupler with the Mediation connected. There are as many direct call buttons assigned to a call station as there are from there Connections to direct call participants can be established.

In the systems of the type described above, the switching of incoming exchange calls is intended to be simplified will. So far the incoming exchange calls were made by the fact that the service connects to the exchange line by pressing the answer button in order to answer the subscriber to talk to the operator side by pressing the operator key and connects to the operator dialing memory occupied for the recording of the dial number for the purpose of establishing the internal connection.

On the basis of FIG. 2 describes a circuit arrangement for a system with direct call facility, in which not only the attendant selection memory is occupied when the attendant key is pressed, but also the relay VS in the direct call transmission D-Ue is switched on. By enabling the relay KS is connected to the contact 1 vs enabling relay DG and the program "Direct call", which is normally caused on DSS keys operation, prevents this purpose is to contact the relay DV lvs prepared and followed DSS keys pressure by closing a corresponding t / A contact, as will be specified below, switched on. With the contact 2vs the

Activation of the relay GT and thus the transmission of a release indicator to the public office or the reproduction of the keystroke is prevented

At the same time, by closing this contact 2 vs, the switching on of the relays DL1 to DL 5 (with 5 direct call options) as address relays is prepared for the identification of the call station desired by the subscriber

If the direct call button assigned to this intercom station is now actuated after pressing the operator button to determine the desired intercom station, the relay DL 1 is switched on , for example when the direct call button DTX is pressed:

1. +, Dri line, G 1, DL i, 2vs, 3dv, -.

A circuit for relay DV is now established via contact AdI 1, via rectifiers G 2 and G 3:

2. +, AW-line, sa, 4d / l, G2, Gi, DV, \ vs, VS'-line, -.

The relay VB is switched on from the operator console via:

3. +, VE line, VB, 3dv, -.

By actuating the relay DV and switching over the contact 3dv, the response circuit for the relays DL 1 to DL 5 is interrupted in order to prevent the effects of 2> further presses of the D button.

By closing the contact 5 vb , the polling memory seeker is requested to identify an end-of-polling program.

With the contact 6vb , the transfer of possibly already stored information from the switching memory to the election evaluator IVS ^ is prevented.

When the contact 6vb is actuated, the relay SA is switched on. »■>

4. +, SAT-Lehung, 6vb, SA, -.

By closing the contact 7sa , the program »end of dialing« is requested in the central control device ZE. By closing the contact% sa , the subscriber address is transferred to the marker M via the already closed contact 9dl 1.

The contact lOsa switches on a cut-off relay for the switching memory, not shown, via the marker for direct call DUe. With the end of program not shown VD relay is in the common part of the attendant console GVPL off Hereby the circuit for the relay VB on V £ -Leitung is turned off by disconnecting the earth, which also by opening the contact 6VB the relay SA and due to open the Contact 11 vb also the holding circuit for the relay DL 1 is interrupted.

With the transfer of the subscriber address of the direct call subscriber to the marker, this is connected via the single coupler EK, ten coupler ZK, mixed coupler MKA with the incoming busy exchange transmission and via this with the exchange. By pressing the key, the exchange switches through the connection to the waiting public subscriber in a known manner.

In the switching state, all direct call keys are switched ineffective, because the relay VS is still held because neither the final key nor a new query key nor an earth key has been pressed. As can be seen from the above, the direct call transmission is triggered by toggling or closing the key.

If two keys are accidentally pressed at the same time after pressing the operator key, this will be the case the DL relay preferred in the chain connection is switched on and the one corresponding to this relay Call station marked.

For this purpose 2 sheets of drawings

Claims (3)

Patent claims: 1. Circuit arrangement for a centrally controlled telephone system, in particular telephone branch exchange, with direct call option and multiple use of the direct call buttons, whereby the direct call buttons can be used to establish a direct call connection between an extension and the exchange as well as to establish other connections subject to different switching states, characterized in that, that depending on switching means (VS, SA) actuated by a mediation measure and switching means identifying by a direct call subscriber (e.g. 9 <// l), the marking of the direct call subscriber by the marker for the regular connection setup (M, Ssa, 9dl 1) and End-of-dialing identification can be initiated in the central control device (ZE) and thus direct call through-connection via the direct call coupler (DK ...) can be prevented. 2. Circuit arrangement according to claim 1, characterized in that by a switching means (VS), which is effectively switched by the press of the switching button, the triggering of the existing connection to be passed on is prevented. 3. A circuit arrangement according to claim 1, characterized in that the switching means (VS), which are switched on by pressing the switching key, prevent the recording of subsequently incoming code number information. 10