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Communication system and method providing optimal restoration of failed paths

  • US 5,835,482 A
  • Filed: 09/18/1996
  • Issued: 11/10/1998
  • Est. Priority Date: 09/22/1995
  • Status: Expired due to Term
First Claim
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1. In a telecommunications network having a plurality of nodes interconnected by a plurality of spans each having working and spare links, a method of restoring traffic disrupted by at least one failed link, comprising the steps of:

  • (a) designating one of a pair of nodes bracketing said one failed link a sender node and an other of said pair of nodes a chooser node, and nodes interconnecting said sender and chooser nodes via said plurality of spans tandem nodes;

    (b) transmitting restoration signals from said sender node to said chooser node along said interconnected tandem nodes, each of said restoration signals including data identifying said sender and chooser nodes, index data and probability data indicative of the likelihood that the path traversed by said each restoration signal is to be used for restoring the disrupted traffic;

    (c) adding to said each restoration signal contention data as said each restoration data traverses along each one of said tandem nodes;

    (d) after receiving said restoration signals for a predetermined time period, said chooser node transmitting reverse restoration signals to backtrack the restoration paths traversed by said received restoration signals, said reverse restoration signals each including particular contention and probability of use data derived from the data carried by a corresponding restoration signal received by said chooser node; and

    (e) upon receipt of an expected number of said reverse restoration signals, said sender node reviewing the respective contention and probability of use data attached to each of said received reverse restoration signals to select an optimal restoration path for restoring the disrupted traffic.

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