DE1487600B2 - Circuit arrangement for signaling in telephone chain systems - Google Patents

Description

that the listening key (Ml; Ml) is designed as a luminous pressure io display serving luminous pushbutton in telephony key and that row systems via a contact, in which each row position has a listening key and a relay serving to toggle

the listening button;: the inquiry relay (R 1 - ,, Rl) can be controlled in such a way that by pressing the listening button after: · the; Complaining. the row point in question (I; II) is triggered. _; .

2. Circuit arrangement according to claim 1, characterized in that the inquiry relay (Rl) is switched on by pressing the Ämtstaste (Al) of a row point (I j , without any effect on the exchange connection.

3. Circuit arrangement according to claim 2, characterized in that a contact (rl) of the inquiry relay (R 1) closes a holding circuit, which via a break contact of the listening in to

(Consultation relay) is assigned, with the waiver of special isolating buttons, the individual triggering

is no longer required trunk lines after brokering by multiple use of an already existing key.

This object is achieved according to the invention in that the listening key is designed as an illuminated pushbutton and that the inquiry relay can be controlled via a contact with the listening button in such a way that by pressing the listening button after toggling, the row point concerned is triggered.

It is already known in key telephone systems

button (Ml) and a working contact of the fork 25 (Siemens magazine from January 1965, p. 76 to 78), changeover switch (GU) of the main unit runs an illuminated pushbutton that serves as a

Use busy display. In addition, a turning function of this key is used to listen in.

(Fig.l).

4. Circuit arrangement according to claim 3, characterized by a contact of the listening key (Ml) through which the holding circuit of the 30 unites.

So there are practically two switches in one button

Besides, it's ^r; Known for self-connection systems from the railway authorities; assign different switching functions to a pushbutton depending on the switching status of the associated system (Flad, A. and ste (Ml), via which the self-supporting 35 Kirch, J. "Eisenbahn-Fernsprechtechnik", 1948,

Consultation relay (R 1) is interrupted when the listening key is pressed (Fig. 1).

5. The circuit of claim 2, ge · _T '■ ".! · Identifies ^one Dürck contact of Mithörta-

Consultation relay (R 1) is brought to drop by short circuit when pressing the listening button (Fig. 2 and 3).

Pp. 82 to 84, 186, 190). As a result of the other task underlying such systems is the well-known The solution to the problem is not readily comparable with the subject matter of the invention.

The listening keys are therefore suitable as separation keys, because line disconnections, e.g. B. an official

'management, in the case of series systems that are in the waiting or inquiry state, then carried out are, if the listening keys in the facilities no further switching operations-in this state of the System have more to do.

With the invention, the listening button is assigned the following functions:

1) Busy indicator for the assigned official body as a result of its training as an illuminated pushbutton;

2) Listen-in key after switching on in the required connection;

3) Disconnect trunk lines that are no longer required. Some circuit examples of the invention are in

In telephone line systems with several line stations connected to a common telephone line it is desirable to check the occupancy status at the individual call stations or at the Transfer of a voice connection from one row position to another the current switching status to be identified, for which purpose illuminated pushbuttons are often used. JThe. Arrangements for the required Signaling must be in series

be made in such a way that, for economic reasons, FIGS. 1 to 3 are shown
the number of required components in the embodiment according to Fig.l is with

ring is held. pressing an exchange key A 1 in the row

In the case of series systems, every authorized station I has occupied an exchange line and the relay Al intercom station participant has access to every exchange line "^; correspond to a contact r 1 is independent of the ability to connect.Each station can also form a holding circuit with every other circuit, which can speak after the station has been called by a closed contact of the listening key M1 and a common signal the common Gabelumrufe in the main bodies are visible and 65 performs switch GU. in entsprehörbare mark in the series spot II. It is further chen the aforementioned switching processes. If possible that queries of an external call managerial office key a 1 in the series of spot II actuated, so r If a subscriber in a row point ends with an on, the switched-on exchange key (e.g. B. A 1) the

most trunk triggered, whereby the inquiry status for the line has occurred while the relay R 1 is in the working position.

The individual exchange lines can be triggered when toggling that a normally closed contact of the listening key is in the holding circuit of the respective associated inquiry relay R. It can thus be disconnected individually by pressing the relevant listening key M, each exchange line in question, since the normally closed contact, for example Ml, opens the hold circuit of the inquiry relay Rl.

While arrangements according to FIG. 1 still require two cords per office for the control processes, show F i g. 2 and 3 arrangements where this is not necessary.

In FIG. 2, in which the operating functions correspond to the example of FIG. 1, step on the ground the following switching operations according to the arrangement:

The connection and disconnection of an inquiry relay Rl, Rl etc. of the individual row positions I, II etc. is carried out via a cord per exchange line. When connecting, a potential (minus) acts via the exchange key contact, e.g. B. A 1, on the associated inquiry relay R 1, which goes into its working position. A normally open contact r 1 of this relay switches a holding circuit in parallel via a resistor for the connection circuit. Changes to the trunk circuits have no effect on the switch positions of the relay R. To separate the inquiry relays Rl, Rl , etc., the listening key of the associated row location, eg Ml, is pressed when the trunk key A 1 is in the idle position. That via the normally open contact .M ϊ · _κ μη4 the connection path to the holding circuit of the relay /? The positive potential now present acts like a short circuit for the winding of the relay R1, which returns to its starting position, whereby the row position is triggered individually.

In FIG. 3, which essentially corresponds to the function of FIG. 2, it is shown that the potentials of F i g. 2 have been swapped. The mode of operation is, however, compared to FIG. 2 not changed.

1 sheet of drawings

Claims (1)

Claims: whose subscribers in another row location are routed via individual lines without the remote subscriber listening in. In order to individually trigger an exchange connection that is no longer required after brokering, the invention is based on a series system in which a separate relay (inquiry relay) is provided for this purpose. The object of the invention is to provide a circuit arrangement for signaling by means of a for Besefel-1 1. Circuit arrangement for signaling by means of an illuminated pushbutton used to indicate busy in telephone line systems, in which each line position has a listening button and a to Toggle relay (inquiry relay) is assigned, characterized in that