Subscriber's telephone hold circuit with automatic disconnect

Details Subscriber's telephone hold circuit with automatic disconnect Subscriber's telephone hold circuit with automatic disconnect

H - Electricity

04

M

379/73

H04M 3/48 (2006.01) H04M 1/00 (2006.01) H04M 1/80 (2006.01) H04M 3/428 (2006.01)

Patent

CA 1217888

SUBSCRIBER'S TELEPHONE HOLD CIRCUIT WITH AUTOMATIC DISCONNECT ABSTRACT OF THE DISCLOSURE A hold circuit for use with a single line telephone which may or may not be equipped with extension instruments. The circuitry in response to the momentary operation of a manual switch actuates a siliconcontrolled rectifier to place a resistive load across the telephone line thus allowing the subscriber at the basic telephone instrument to go "on hook". Subsequent removal of the basic instrument handset from the hookswitch or an extension phone going "OFF HOOK" will cause the resistive load to be removed. Also included is a hold release circuit which auto- matically disconnects the hold circuit after a pre- determined period of time.

461523

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