Subscriber line interface circuit

Details Subscriber line interface circuit Subscriber line interface circuit

1986-08-19

1989-05-02

Ng, Jin F.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379385, 379377, 379399, H04M 1900, H04M 322

Patent

active

048275050

ABSTRACT:
A subscriber line interface circuit receives and twice inverts currents from a 2-wire subscriber line and returns the currents to the subscriber line so longitudinal input impedance is low. Any differential input current in the subscriber lines is bypassed by a capacitor, so differential input impedance is very high. The circuit also sends a signal current from one system having one ground to another system having a different ground through one current path, while sending another current, having a phase opposite and amplitude equal to the signal current, through another path. This effectively isolates the two systems having different grounds.

REFERENCES:
patent: 4203012 (1980-05-01), Boxall
patent: 4300023 (1981-11-01), Kelley et al.
patent: 4314196 (1982-02-01), Brown
patent: 4431874 (1984-02-01), Zobel et al.
patent: 4447675 (1984-05-01), Arntsen et al.
Electronic Design, vol. 28, no. 20, Sep. 27, 1980, pp. 84-91, L. Brown et al. "One chip closes in on SLIC functions".
Pace, W. David, "A Monolithic Telephone Subscriber Loop Interface Circuit", IEEE Journal of Solid-State Circuits, vol. SC-16, No. 4, Aug. 1981, pp. 270-278.

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