Electronic key telephone system

Details Electronic key telephone system Electronic key telephone system

1983-05-10

1985-05-28

Schreyer, Stafford D.

179 99M, H04M 100, H04M 172

Patent

active

045202354

ABSTRACT:
An electronic key telephone system comprising multiple key telephone stations 8-1 each connected to a central switch 2 by a single communication line 10-1 and to a central control unit 3, 4, 5 by a single data line 9-1. Each station has a plurality of buttons 150 for specifying a service request and a display 120 of current service status and means for periodically transmitting service requests over the data path. The central control unit periodically receives on the data line service requests from each of the buttons and transmits service status information to the station.

REFERENCES:
patent: 4125749 (1978-11-01), Kinoshita et al.

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