Subscriber line circuit having an improved offhook...

Details Subscriber line circuit having an improved offhook... Subscriber line circuit having an improved offhook...

H - Electricity

04

M

379/67

H04M 3/22 (2006.01)

Patent

CA 1255409

A SUBSCRIBER LINE CIRCUIT HAVING AN IMPROVED OFFHOOK SUPERVISION CIRCUIT ABSTRACT OF THE INVENTION An improved offhook supervision circuit including an amplifier connected to a subscriber loop through the tip and ring conductors of a subscriber line circuit. The amplifier is arranged to develop and output a loop voltage signal representing the level of the DC signals applied to the subscriber loop circuit. A comparator device has a first input connected to the amplifier and is arranged to receive the loop voltage signal output by the amplifier. A second input of the comparator device is connected to a reference voltage device which outputs a predetermined reference signal voltage. Any significant reduction of the DC signal level on the loop circuit will cause the loop signal voltage output by the amplifier to fall below the reference signal voltage. An offhook signal is then output from the comparator device to a control device signaling an offhook condition.

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