Subscriber line interface circuit

Details Subscriber line interface circuit Subscriber line interface circuit

1988-04-06

1989-07-25

Ng, Jin F.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379399, H04M 1900

Patent

active

048521620

ABSTRACT:
The present invention describes a low power consumption type subscriber line interface circuit (SLIC). The SLIC described in the present invention includes a first pair of potential detectors each of which detects the potential difference between each corresponding subscriber line and a first predetermined value, a second pair of potential difference detectors each of which detects a potential difference between each corresponding subscriber line and a second predetermined value, a pair of signal adder circuits each of which sums output signals from one of the first potential difference detectors and one of the second potential difference detectors, and a pair of amplifiers each of which amplifies each output signal from each signal summing circuit and returns a direct current to the each of corresponding subscriber lines.

REFERENCES:
patent: 4491700 (1985-01-01), Tahara et al.
patent: 4723280 (1988-02-01), Meier et al.
patent: 4764956 (1988-08-01), Rosch et al.
Denis W. Aull et al., "A High-Voltage IC for a Transformerless Trunk and Subscriber Line Interface", IEEE Journal of Solid-State Circuit, vol. SC-16, No. 4, pp. 261-266, Aug. 1981.

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