Key telephone system signalling and control arrangement

Details Key telephone system signalling and control arrangement Key telephone system signalling and control arrangement

1983-04-21

1985-04-16

Schreyer, Stafford D.

179 99M, 179 99E, 179 99P, H04M 172

Patent

active

045117675

ABSTRACT:
A key telephone system having a plurality of telephone station sets for selective connection to first or second telephone lines. The system includes a control unit which detects the presence of on-hook conditions on the lines, and transmits control signals in selected time slots to each of the station sets over a single control line to indicate the off-hook/on-hook status of the lines. The system may include circuitry at each station set for transmitting additional control signals in other selected time slots over the single control line to identify privacy release of the telephone line connected thereto.

REFERENCES:
patent: 3549820 (1970-12-01), Knollman
patent: 3647980 (1972-03-01), Fabiano, Jr. et al.
patent: 4160131 (1979-07-01), Kaul et al.
patent: 4234765 (1980-11-01), Sekiguchi et al.

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