Power feeding system using two-wire subscriber lines
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United States of America Patent
Stats
-
Jun 12, 2001
Grant Date -
N/A
app pub date -
Aug 12, 1998
filing date -
Aug 15, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A power feeding system includes a line state detector for detecting an operation state of each of a pair of 2-wire subscriber lines connected to the exchange equipment and a transformer for supplying the DC power to the subscriber terminal through each of the pair of 2-wire subscriber lines connected to the subscriber terminal. When the detector detects a subscriber line test state, a switch circuit detaches the transformer from each of the pair of 2-wire subscriber lines and directly connecting the exchange equipment to the subscriber terminal through each of the pair of 2-wire subscriber lines.
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