Control system for a plurality of telephone sets

Details Control system for a plurality of telephone sets Control system for a plurality of telephone sets

1988-04-04

1990-09-18

Ng, Jin F.

Telephonic communications

Multi-line or key substation system with selective switching...

With special service

379163, 379173, 379183, 379195, 379373, 379393, H04M 100

Patent

active

049583700

ABSTRACT:
A control system for a plurality of telephone sets connected as branched to a central office line allows extension calling, privacy function setting and hold releasing operations between the telephone sets. Each of the telephone sets in the branched connection comprises keys through which a control data corresponding to a desired control operation is inputted, a transmission circuit for sending to the central office line a control signal corresponding to the control data inputted by the keys, a reception circuit for receiving the control signal from the line, and a control circuit for performing a predetermined control operation on the basis of the control signal received by the reception circuit, whereby the respective operations of the telephone sets are mutually controlled on the basis of the control signal.

REFERENCES:
patent: 4443664 (1984-04-01), Gange
patent: 4492822 (1985-01-01), Alderman
patent: 4636589 (1987-01-01), Lee

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