Battery feed circuit for a telephone system

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

H - Electricity

04

M

379/63

H04M 3/00 (2006.01) H04M 19/02 (2006.01) H04M 19/08 (2006.01)

Patent

CA 1287197

ABSTRACT An arrangement is disclosed for delivering DC power (battery), voice, and data 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.

568095

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