Link card circuit for electronic key telephone system

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

H - Electricity

04

M

379/33

H04M 3/42 (2006.01)

Patent

CA 1177982

ABSTRACT OF THE DISCLOSURE A link card circuit for the key service unit of an electronic key telephone system comprised of a passive port means operative, in response to a seizing signal from any active port means to which it is connected, to generate a signal indicating its seized status to all active port means to which it is connected and to close a dialing signal path to a register link data means operative to receive data signals from the register identifying one of a plurality of active part means in said link card circuit, and to re-open said dialing signal path and close at least one path from said identified active port means to the passive port to which it is connected: detection circuit means operative to receive and detect the status signal being generated by said passive port means at the time said identified active port means path is closed; and current generator means operative, in response to a service request signal received by said link card circuit through said passive port means, to send a ser- vice signal to the seized passive port only if said status signal indicates that the requested service is available.

435926

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