DE2439165C3 - Circuit arrangement for a centrally controlled telephone system, in particular telephone branch exchange, with direct call facility - Google Patents

Description

35

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 both 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> o is to simplify the method and the arrangement for the switching of incoming trunk calls and the production of Direktrufverbindungen by the operator in centrally controlled telephone systems.

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 «> 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 key becomes in the course of the h '> Call forwarding used as Speed Dial. This turns the service into a mediator without additional effort for a speed dial through the double use of the direct call buttons simplified

In the drawings is an embodiment of the invention with those important for understanding Details shown the

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

2 shows circuit details for explanation of the embodiment.

From FIG. 1 shows how a call station Ni 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, the marker and route finder M / WSU . A free voting memory WSp is then connected to the transmission 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 ZE

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 mixing coupler MKA, the ten coupler ZK and single coupler EK.

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 The calling direct call subscriber is the intermediary via activated £> L / DK 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 trunk calls can be simplified. So far the arriving Outside calls made by the operator by pressing the answer button to the outside line switches on to interrogate the subscriber to contact the operator by pressing the operator key connects and with the latter a switching dialing memory for the inclusion of the dialing numbers occupied 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. When the KS relay is switched on, contact 1 vs prevents the DG relay from being switched on and thus the "direct call" program, which is normally initiated when a direct call key is pressed. For this purpose, the relay DV is prepared with contact 1 vs and switched on when the direct call button is subsequently pressed by closing a corresponding t / A contact, as will be specified below. 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 DLS (with 5 s direct call options) is prepared as address relays for the identification of the intercom required by the subscriber

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

1. +, Dri-Leituiig, G 1, DL t, 2vs.3dv, -.

Now a circuit for the relay DV is established via the contact AdIX, via the rectifiers GI and GZ:

2. +, M // - line, sa, 4dl 1, G2, G3, DV, Ivs, VB 'line, -.

Worn attendant ago, the relay VB switched on:

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

By actuating the relay DV and switching over the contact 3dv , the response circuit for the relays DL1 to DLS is interrupted in order to prevent the effects of further D-key presses.

By closing contact 5 vi> becomes the polling memory searcher to identify an end-of-polling program requested

With the contact 6vb , the transfer of any information already stored from jo to the election evaluator WBW is prevented from the switching selection memory

When the contact 6vb is actuated, the relay SA is switched on 4. +, SA r-line, 6 vb, SA, - .

By closing the contact 7sa , the program »end of dialing« is requested in the central control device ZE. By closing the contact 85a, the subscriber address is transferred to the marker M via the already closed contact 9dl 1.

The contact Losa switches on the marker for Direct DUe an interface relay for the non-illustrated switching dial memory eia With P. ogrammende is not shown VD relay in the common part of the attendant console GVPL off This is the circuit for the relay VB on the VE-line switched off by disconnecting the earth, whereby the relay SA is also interrupted by opening the contact 6vb and, as a result of the opening of the contact llvb , the holding circuit for the relay DL 1 is also interrupted.

With the transfer of the subscriber address of the direct call subscriber to the marker, the latter is connected to the incoming office transmission via the single coupler EK, ten coupler ZK, mixed coupler MKA 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 buttons are ineffective because the relay VS is still on held because neither the final key nor a new query key nor an earth key was pressed. As As can be seen from the above, the direct call transmission is triggered by toggling or closing the key brought about

Are accidentally after pressing the operator key If two buttons are pressed at the same time, it becomes the preferred DZ relay in the chain connection switched on and the microphone unit corresponding to this relay marked

For this purpose 2 sheets of drawings

Claims (3)

Patent claims: 1. Circuit arrangement for a centrally controlled telephone system, in particular an auxiliary telephone system, 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, assuming other switching states are characterized in that, depending on switching means (VS, SA) activated by a mediation measure and on switching means identifying a direct call subscriber ( e.g. SdIi), the marking of the Direktnifteilneiimers 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. A circuit arrangement according to claim 1, characterized in that by a switching means (VSX activated by the switching button press) 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.