Distributed preconfiguration of spare capacity in closed paths for network restoration
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United States of America Patent
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Mar 24, 2015
Grant Date -
May 24, 2007
app pub date -
Jan 23, 2007
filing date -
Jul 11, 1997
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Abstract
A method for restoring traffic in a network. The network includes plural distinct nodes interconnected by plural distinct spans, each span having working links and spare links. Each node has a digital cross-connect switch for making and breaking connections between adjacent spans forming span pairs at a node. Cross-connections between spare links in adjacent spans are made such that sets of successive nodes through which the adjacent spans form span paths form closed paths. A method of finding and construction closed paths is described in which statelets are broadcast through the network. In a preferred method of implementation of the method, the statelet broadcast occurs not in response to a network failure, but across the entire network before any particular span failure and may be carried out during normal network operations as a continual re-configuration of the network.
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