Hybrid circuit

Details Hybrid circuit Hybrid circuit

1990-08-09

1992-07-07

Dwyer, James L.

Telephonic communications

Subscriber line or transmission line interface

Hybrid circuit

379345, 379398, H04M 100

Patent

active

051289920

ABSTRACT:
A hybrid circuit which converts receiving side four-wire signals from a switching network into two-wire signals, supplies the same through line B and line A to a telephone terminal equipment, and converts two-wire signals supplied from the telephone terminal equipment through the line A and the line B to the switching network into transmitting side four-wire signals, including a pair of battery feeding and terminating resistors connected between power sources (GND and V.sub.BB) and the line B and line A and a receiving side mirror circuit and transmitting side mirror circuit both connected between the lines B and A.

REFERENCES:
patent: 4004109 (1977-01-01), Boxall
patent: 4203012 (1980-05-01), Boxall
patent: 4300023 (1981-11-01), Kelley et al.
patent: 4358645 (1982-11-01), Brown
patent: 4406929 (1983-09-01), Pace et al.
patent: 4431874 (1984-02-01), Zobel et al.
patent: 4600811 (1986-07-01), Hayashi et al.
patent: 4827505 (1989-05-01), Takato et al.
patent: 4852162 (1989-07-01), Taya et al.
IEEE Journal of Solid-State Circuits, vol. SC-16, No. 4, Aug. 1981, pp. 270-278; W. D. Pace: "A monolithic telephone subscriber loop interface circuit".

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