Patent
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.
Northern Telecom Limited
Robinson Thomas A.
Turpin Frank
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