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Back-up restoration technique for SONET/SHD rings

  • US 6,370,110 B1
  • Filed: 09/16/1998
  • Issued: 04/09/2002
  • Est. Priority Date: 09/16/1998
  • Status: Expired due to Fees
First Claim
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1. For use with a network that includes (i) at least one service ring configured of first links that each run between a pair of nodes to form a ring-like path;

  • (ii) at least one protection ring configured of second links that each runs between said pair of nodes in parallel with a corresponding first link; and

    (iii) a mesh sub-network network that includes a plurality of third links that collectively provide point-to-point connectivity between selected nodes, a method for restoring traffic in the event of a failure of a failed link, comprising;

    monitoring the service and protection rings, respectively, to determine whether each of the first and second links is one of a failed or active state;

    simultaneously monitoring the mesh network to determine whether each third link is in an active or failed state; and

    establishing, in response to a determination that one of said first and third links has failed, a restoration path comprised of at least one of said second and third links that are in an active state, and effecting the switching of traffic from a failed one of said first links and third links, as determined from said monitoring steps, onto said restoration path.

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