Subscriber line interface circuit

Details Subscriber line interface circuit Subscriber line interface circuit

1983-07-28

1985-09-10

Rubinson, Gene Z.

179 18AH, H04Q 300

Patent

active

045408548

ABSTRACT:
A transformerless, fully balanced, telephone line circuit is provided. Two differential amplifiers are employed, one for incoming signals and the other for outgoing signals. The latter drives the line with two out-of-phase, equal amplitude signals. A comparator detects grounding of either TIP or RING at the telephone to accommodate international applications.

REFERENCES:
patent: 4178485 (1979-12-01), Cowpland et al.
patent: 4182936 (1980-01-01), Beirne et al.
patent: 4281219 (1981-07-01), Cowpland et al.
patent: 4284853 (1981-08-01), Lechner
patent: 4320260 (1982-03-01), Lechner

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