Data distribution system for private automatic branch exchange

Details Data distribution system for private automatic branch exchange Data distribution system for private automatic branch exchange

1979-07-02

1981-08-25

Brown, Thomas W.

179 55, 179 18AB, 179 18J, 179 27D, 179 27FC, H04M 156, H04M 364, H04Q 356, H04Q 364

Patent

active

042861187

ABSTRACT:
A data distribution system for a private branch telephone exchange for providing information to a plurality of PBX stations. Two embodiments (serial and parallel) including addressable stations are shown. Memory devices driving a plurality of displays at each station are updated in response to command signals from a controller preceded by the station address. Each station may communicate with the controller and transmit keyed-in signals or information reflecting station availability. A novel multiplexed LCD, switching matrix bypass upon controller failure circuit, and bus protection circuit upon remote power supply failure are also shown.

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