Service Restoration in Switched Ethernet Networks

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Executive Summary

Recovery from a network failure has two primary components: detection and restoration. Before recovery can be effected, the failure has to be detected. Sometimes this is easy such as when a fiber is pulled out and signal is lost. Often it is more difficult such as when framing is lost due to a line error or if the signal is degrading. Clearly, without knowledge of a failure the system can't begin to respond. In addition to having well-defined criteria for deciding that there has been a failure, the systems must be designed to get fast notification.

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