Telephone line circuit with differential loop current sensing an

Details Telephone line circuit with differential loop current sensing an Telephone line circuit with differential loop current sensing an

1977-10-17

1978-07-25

Robinson, Thomas A.

179 81R, H04Q 128

Patent

active

041031121

ABSTRACT:
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.

REFERENCES:
patent: 3714548 (1973-01-01), Macrander
patent: 4027235 (1977-05-01), Macrander et al.
patent: 4046967 (1977-09-01), O'Neill
patent: 4046968 (1977-09-01), Embree et al.

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