Line card circuit for electronic key telephone system

Details Line card circuit for electronic key telephone system Line card circuit for electronic key telephone system

H - Electricity

04

M

379/33

H04M 3/42 (2006.01)

Patent

CA 1177980

ABSTRACT OF THE DISCLOSURE A line card circuit for the key service unit of an electronic key telephone system comprised of a passive post means operative to receive a service signal and, in response thereto, to generate a signal indicating the status of the line card circuit and a service actuating signal; con- trol circuit means operative, in response to said service actuating signal, to effect the requested service; and ring detection circuit means operative, in response to a ringing signal on the associated line, to generate an incoming call enable signal.

435924

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