Appeal No. 1998-1473 Page 2
Application No. 08/493,741
algorithm restores traffic that has been disrupted by a fault
in such a network by finding an alternate route to carry the
traffic to bypass the fault. A limited number of spare links
are included in the network for restoration. More
specifically, the alternate route is established by
interconnecting some or all of the spare links so that traffic
may be rerouted therethrough.
The spare links, called "a spare capacity," provide a
limited safety margin for distributed restoration to take
place. If the network were to remain in the topology that
includes the use of the spare links, its ability to restore
traffic after other faults would be curtailed.
The appellants' invention automatically reconfigures the
topology of a telecommunications network back to its normal
state after repair of a fault resulting in a distributed
restoration. In general, after such a repair, an Operation
Support System commands the custodial nodes and the tandem
nodes forming an alternate route to perform the inverse of the
operation that the nodes performed during the restoration.
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