Interface circuit for a subscriber line circuit

Details Interface circuit for a subscriber line circuit Interface circuit for a subscriber line circuit

1984-10-15

1986-07-01

Rubinson, Gene Z.

179 16AA, 179 84R, H04M 1902, H04M 302

Patent

active

045981736

ABSTRACT:
An interface circuit for a subscriber line circuit employs a controllable amplifier including a switching converter. The switching converter includes a capacitor coupled across a two-wire subscriber line and supplies an auxiliary voltage to the line. The amplifier includes an input adder having an output coupled to the switching converter for controlling the magnitude of the auxiliary voltage with one input of the adder adapted to receive a feedback control signal which is developed by monitoring the voltage across the output. Another input to the adder receives line input signals for the line circuit. The amplifier is controlled in operation by an off hook detector which provides an output signal when the subscriber line goes off hook to cause the amplifier to operate and further includes ring control logic which is also coupled to the amplifier and activates the amplifier during the presence of a ring control signal. In this manner, the amplifier is operative only during an off hook condition of the line and during ringing generation. The amplifier, based on its structure in the line circuit, provides all basic line functions such as DC current, ringing, voice and remote metering signals.

REFERENCES:
patent: 4220826 (1980-09-01), Kiss
patent: 4306118 (1981-12-01), Ciboulet et al.
patent: 4341928 (1982-07-01), Stanson et al.
patent: 4370526 (1983-01-01), Schoofs et al.
patent: 4429186 (1984-01-01), Gartner
patent: 4431868 (1984-02-01), Bolus et al.
patent: 4456991 (1984-06-01), Chea, Jr. et al.
patent: 4458112 (1984-07-01), Svala

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