Key telephone system signalling and control arrangement

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

H - Electricity

04

M

363/10, 379/33,

H04M 3/42 (2006.01) H04M 9/00 (2006.01)

Patent

CA 1200033

KEY TELEPHONE SYSTEM SIGNALLING AND CONTROL ARRANGEMENT Abstract of the Disclosure 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. - i -

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