Telephonic communications – Subscriber line or transmission line interface – Power supply
Reexamination Certificate
2005-01-25
2005-01-25
Tieu, Binh (Department: 2643)
Telephonic communications
Subscriber line or transmission line interface
Power supply
C379S001010, C379S009050, C379S324000, C379S348000, C379S413020, C700S286000, C363S146000
Reexamination Certificate
active
06847718
ABSTRACT:
A remote power feeding method allowing efficient remote power feeding into a network termination device in the event of a commercial power failure at a subscriber site is disclosed. When the commercial power failure occurs, a power failure signal is transmitted from the subscriber-side network termination device to the central office-side line termination device. The central office-side line termination device, when receiving the power failure signal, starts DC power feeding to the subscriber-side network termination device via the subscriber line. During the power failure, only voice communication is permitted using previously selected good channels.
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Foley & Lardner LLP
NEC Corporation
Tieu Binh
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