Power feed circuit providing both on-hook and off-hook power for

Details Power feed circuit providing both on-hook and off-hook power for Power feed circuit providing both on-hook and off-hook power for

1998-05-08

2000-12-05

Woo, Stella

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379399, H04M 1100

Patent

active

061577162

ABSTRACT:
A power feed circuit provides power for a telephone subscriber loop connected to a unit of terminal equipment. The power feed circuit includes a first current supply circuit for supplying power to the subscriber loop when the unit of terminal equipment is in an on-hook condition and when the unit of terminal equipment is in an off-hook condition, and a second current supply circuit for supplying power to the subscriber loop only when the unit of terminal equipment is in the off-hook condition. Each current supply circuit includes a respective battery, transistor and bias network. The first current supply circuit is connected to the subscriber loop via a diode which is reverse-biased when the unit of terminal equipment is in the on-hook condition. The power feed circuit may be usefully applied in an Optical Network Unit (ONU) of a "fiber-in-the-loop" telephone system or in a Subscriber-Cable Interface Unit (SCIU) of a cable telephony system.

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