ATM emulated path protection
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United States of America Patent
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Sep 7, 1999
Grant Date -
N/A
app pub date -
Apr 12, 1996
filing date -
Apr 12, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates generally to protection of asynchronous transfer mode (ATM) traffic against Synchronous Optical Network (SONET) fiber cuts or other types of transmission media failures in a SONET Ring. The nodes of the Synchronous Optical Network protect the asynchronous transmission mode cells for immediate failures in the Synchronous Optical Network by establishing a table indicating the topology of the nodes in the Synchronous Optical Network. Each node is capable of detecting a loss of header error check synchronization and generating a protection payload data unit, which is egressed to the plurality of nodes. In addition, each node is capable of ingressing protection payload data units from neighboring nodes and for switching the transmission of asynchronous transmission mode cells within the node so that the cells being transmitted in the network are protected. In addition, each node is capable of detecting the restoration of header error check synchronization and capable of switching the transmission of asynchronous cells within the node when header error check synchronization is restored.
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