Path protection switch ring system for line saving even though line setting operation was not carried out
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United States of America Patent
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Aug 4, 1998
Issued Date -
N/A
app pub date -
Oct 29, 1996
filing date -
Sep 20, 1993
priority date (Note) -
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status (Latency Note)
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Abstract
A path protection switch ring system has a working line, a protection line, and a plurality of add/drop multiplexers. The add/drop multiplexer has a path-switch unit, an unequipped signal detection unit, and a path-switch control unit. The path-switch unit is used to switch between the working line and the protection line. The unequipped signal detection unit is used to detect an unequipped signal which is output when line setting has not been carried out. The path-switch control unit is used to control the switching operation of the path-switch unit when the unequipped signal is detected.
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