DE3214656C2 - Control device for an intercom - Google Patents

Abstract

The invention relates to a control device for an intercom system in which the subscriber stations are connected to the central switching device via lines for the transmission of the speech streams, the control criteria and the feed stream, in which the remote stations desired in speech communication can be selected by means of button-controlled dialing and the occupancy status at the subscriber station is recognizable and the transmission of the control criteria takes place in time division multiplexing and is characterized in that a microcomputer is provided in the central switching device, in the memory of which allocations are stored for each subscriber station that the microcomputer checks the desired subscriber station and, if necessary, a Through connection takes place and that a busy message is sent to all subscriber stations for a display by the microcomputer. This results in the advantages of standard wiring, a uniform intercom station check and quick adaptation to the respective user requirements.

Description

Supplementary sheet to patent specification 32 14 after unrestricted maintenance

Int. Cl .: H 04 M 9/00

Publication day

of patent grant: February 14, 1985

In column 1 of the patent specification, lines 26 to 28 are to be replaced by:

that the subscriber stations each have a two-wire Control line for the transmission of control functions in both directions 30 and a two-wire Voice line are connected to the central exchange.

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Claims (10)

Patent claims: 1. Control device for a spray system, in which the subscriber stations with the central switching device Via lines for the transmission of the speech streams, the control criteria and the Supply current are connected, in which the remote station or the Remote stations can be selected using button-controlled dialing and the occupancy status of the system is recognizable at each subscriber station, with a microcomputer in the central switching device is provided, in its memory for each subscriber station the assignments of subscriber numbers to dial key and busy display are storable, the subscriber stations through the Microcomputers are queried cyclically for their connection request, a test of the desired Subscriber station on non-occupancy and possibly a through-connection takes place and a Besetütmessage is sent simultaneously to all subscriber stations in which the message is in a corresponding occupancy display is implemented, d a marked, that the subscriber stations each have a two-wire control line in duplex traffic with the central Switching center are connected, that the microcomputer (μθ) with the control lines (a 2, b 2, ...) is connected via a data transmission device (Mod, Dem) , the receiving part (Dem) by means of a coupling network (KPOl ... KP 20) to a through the control line specific to the interrogation cycle can be switched on and its transmitting section (Mod) is connected to the twin wires of the control lines via an amplifier (V) and decoupling resistors (Rl, RV ... R20, R 20 ') and
that for the transmission of the control criteria pulses are used in temporally different positions of a pulse frame, whereby the control criteria necessary for the identification * o of the operating status of each subscriber station at the other subscriber stations and the control criteria required for connection establishment are generated by pulse counting chains arranged in each subscriber station and in the exchange (F Fig. 2). 2. Control device according to claim 1, characterized in that the assignment of subscriber number to pulse point in the pulse frame in the memory of the microcomputer (μϋ) can be stored. 3. Control device according to claim 1 or 2, characterized in that the transmitting and receiving part of the data transmission device are each connected to the microcomputer (ßC) via a series-parallel converter (S / P) (Fig. 2). 4. Control device according to one of the preceding claims, characterized in that in the Subscriber stations each have a microcomputer through which the message is implemented in the corresponding occupancy display and the implementation of the actuation of a dial key in a corresponding one Pulse telegram generation take place. 5. Control device according to one of the preceding claims, characterized in that in the Subscriber stations one or more dial buttons are provided, which are free by the subscriber Available are variably assignable to a discrete subscriber station or for a group or Conference call to several participant stations. 6. Control device according to claim 5, characterized in that the assignment takes place by when the freely assignable dial button has been activated, those assigned to the desired subscriber stations Dial buttons are operated. 7. Control device according to claims 5 or 6, characterized characterized in that the assignment is stored in the memory of the microcomputer so long, until it is overwritten by a new assignment. 8. Control device according to one of the preceding claims, characterized in that in the Subscriber stations one or more dial buttons are provided, which automatically the last calling Subscriber stations are assigned, and that these dialing keys are assigned a display device indicating whether there was an unanswered call. 9. Control device according to claim 8, characterized in that the display device has a The numeric display is on which the subscriber numbers of the last unanswered caller can be displayed are. 10. Control device according to one of the preceding claims, characterized in that the microcomputer (μθ) checks the desired but occupied subscriber station for priority authorization and, if necessary, a connection.