Virtual path ring protection method and apparatus
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United States of America Patent
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-
Apr 22, 2003
Grant Date -
Nov 29, 2001
app pub date -
Jul 14, 2001
filing date -
Mar 15, 1999
priority date (Note) -
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Abstract
A method and apparatus for the robust implementation and protection of Asynchronous Transfer Mode (ATM) traffic over a Synchronous Optical Network (SONET) Unidirectional Path Switched Ring (UPSR). The traditional SONET bridging function is eliminated for the ATM traffic in favor of a selector function. The selector function occurs at the ingress of the ATM traffic to the UPSR and directs the ATM traffic to its destination via a virtual path over the UPSR. The ATM traffic is protected from both SONET failures and ATM failures by means of an Intra-Ring Communication (IRC) protocol. The IRC protocol governs failure detection and the notification of the SONET nodes on the UPSR of the failure and any protection switch that may be necessary.
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