Battery feed circuit for a telephone system

Details Battery feed circuit for a telephone system Battery feed circuit for a telephone system

1987-07-13

1989-03-14

Ng, Jin F.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379165, 370 27, H04M 300, H04M 1902

Patent

active

048130664

ABSTRACT:
An arrangement is disclosed for delivering DC power (battery), voice, and ta signals from a telephone controller to a telephone station over first and second wire-pairs. Minimum interference between these signals is achieved when the first wire-pair is used as the voice signal path and the second wire-pair is used as the data signal path. DC power is fed out of the controller and into the center tap of an audio transformer interconnected with the first wire-pair. Ground current is returned to the controller through a balanced resistive circuit interconnected with the second wire-pair.

REFERENCES:
patent: 3497619 (1967-10-01), Babcock
patent: 3993880 (1976-11-01), O'Neill
patent: 4087647 (1978-05-01), Embree et al.
patent: 4363936 (1982-12-01), Christian et al.
patent: 4393494 (1983-07-01), Belforte et al.
patent: 4432089 (1984-02-01), Wurzburg et al.
patent: 4598396 (1986-07-01), Upp et al.

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