Synchronization system for key telephone system

Details Synchronization system for key telephone system Synchronization system for key telephone system

1980-05-20

1982-02-02

Brown, Thomas W.

Multiplex communications

Wide area network

Packet switching

370103, H04J 306, H04J 312, H04M 172

Patent

active

043141099

ABSTRACT:
A synchronization system for a key telephone system, in which key information or the like information signal between a key service unit and each key telephone set is transmitted in the form of a time-division pulse signal under the control of a counter provided in the key service unit. The information signal has a format which is divided into a first signal from the key service unit to each key telephone set and a second signal from each key telephone set to the key service unit so as to make distinction between the first and second signals in terms of time. The first signal is disposed in a time slot preceding the second signal to provide a pair of signal groups. A one-pulse start signal is disposed in the foremost time slot of the signal groups and a one-pulse answer signal is disposed in a time slot between the first signal and the second signal.

REFERENCES:
patent: 3938144 (1976-02-01), Pederson et al.

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