Telephone line circuit with differential loop current...

Details Telephone line circuit with differential loop current... Telephone line circuit with differential loop current...

H - Electricity

04

M

379/63, 379/67

H04M 1/00 (2006.01) H04M 3/00 (2006.01) H04M 3/22 (2006.01) H04M 19/00 (2006.01)

Patent

CA 1074034

TELEPHONE LINE CIRCUIT WITH DIFFERENTIAL LOOP CURRENT SENSING AND COMPENSATION Abstract of the Disclosure The invention provides a telephone line circuit in which the likelihood of exposing circuit devices in an associated switching facility to potentially damaging currents or voltages is greatly reduced. A repeat coil includes a primary winding for connection to a subscriber loop circuit. Direct loop current is maintained in the primary winding and the resulting d-c flux is compensated for by a regulator including a balancing winding. The core material in the repeat coil is saturable and limited in bulk to that sufficient to transmit normal a-c voice signals across the line circuit. Signals of a magnitude which cause the core material to saturate are thereby impeded in transmission across the line circuit. - i -

288131

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