A system and method for detecting an off-hook condition

Details A system and method for detecting an off-hook condition A system and method for detecting an off-hook condition

H - Electricity

04

M

H04M 3/22 (2006.01) H04M 3/14 (2006.01) H04M 7/00 (2006.01)

Patent

CA 2289383

A line card for terminating a telephone line, the line for coupling to a customer premises equipment, the line card comprising an interface for transmitting and receiving an analog signal with the telephone line, an AC ringing signal generator for generating a ringing signal at the customer equipment, a DC signal generator for generating a DC signal when said customer equipment is off hook, and a circuit for determining the duty cycle of a loop current in the telephone for determining the hook status of the customer equipment, whereby the loop current is combination of the ringing signal and DC signal.

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