Subscriber line circuit having an improved loop current supply c

Details Subscriber line circuit having an improved loop current supply c Subscriber line circuit having an improved loop current supply c

1985-08-29

1987-08-04

Rubinson, Gene Z.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379399, H04M 1900

Patent

active

046851305

ABSTRACT:
An improved loop current supply circuit including a first amplifier connected to a source of bias voltage. The first amplifier is further connected to a subscriber loop circuit through the tip and ring conductors. The first amplifier receives the bias voltage and supplies loop current to the loop circuit. A second amplifier connected to the tip and ring conductors outputs a voltage representative of the amount of current in the subscriber loop. When the output voltage of the second amplifier becomes greater than the bias voltage, a loop voltage network connected to the second amplifier and to the bias voltage source shunts the bias voltage from the first amplifier, decreasing the current in the loop circuit.

REFERENCES:
patent: 4203009 (1980-05-01), Tattersall
patent: 4476350 (1984-10-01), Aull et al.
patent: 4532381 (1985-07-01), Rosenbaum et al.
patent: 4571460 (1986-02-01), Rosenbaum et al.
patent: 4581487 (1986-04-01), Cochran

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