Four-wire conversion circuit for a telephone subscriber line

Details Four-wire conversion circuit for a telephone subscriber line Four-wire conversion circuit for a telephone subscriber line

1981-04-06

1984-04-24

Pellinen, A. D.

179170T, H04B 158

Patent

active

044450060

ABSTRACT:
In the circuit arrangement according to the invention, the two transistors with their main current lines connected in series cause no disturbance of balance in the subscriber's line. By means of exclusively alternating current coupling on the subscriber's lines wire leads, extension elements which cause no galvanic voltage drop can also be connected on. The series connection of the main current lines of the transistors may be run directly to the input of the amplifier emitting the outgoing signals.

REFERENCES:
patent: 3823272 (1974-07-01), Tabalba
patent: 3886322 (1975-05-01), Colardelle et al.
patent: 3970805 (1976-07-01), Thomas
patent: 4041252 (1977-08-01), Cowden
patent: 4087647 (1978-05-01), Embree et al.
patent: 4163878 (1979-08-01), Hashemi
patent: 4300023 (1981-11-01), Kelley et al.
patent: 4388500 (1983-06-01), Regan
U. Appel & P. Abramson; "Electronic Hybrid for Telephone Using a Differential Amplifier," IBM Technical Disclosure Bulletin; Oct. 1973; pp. 1513-1514.

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