Apparatus and method for protection switching in a network
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United States of America Patent
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Sep 13, 2011
Grant Date -
May 6, 2004
app pub date -
Jun 25, 2003
filing date -
Jun 25, 2002
priority date (Note) -
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Abstract
A system supports 50 ms protection switching times independent of network architecture. The system includes multiple protection switch fabrics to perform facility protection switching for the signals and a central switch fabric to switch a subset of the signals in a non-facility protection switching manner among the protection switch fabrics. Linear and ring network configurations are supported by the system. The system has flexibility to perform Linear Automatic Protection Switching (LAPS), Unidirection Path Switched Ring (UPSR) protection switching, and Bidirectional Line Switched Ring (BLSR) protection switching without burdening the central switch fabric with unnecessary or redundant traffic.
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