Patent Document ID: 7719962
Application ID: 10000715
Patent Flag: 1

Claim One:
1. A method of restoring a telecommunications network, in which the telecommunications network includes plural nodes terminating plural spans, the plural nodes including nodes of degree two and nodes of at least degree three, the method comprising the steps of: accumulating a set of working capacity values (w tot ) resulting from routing demands between a first node of at least degree three and a second node of at least degree three, the first node and second node being connected through a chain of nodes including at least a third node; wherein local flow values (w loc ) are intra-chain working capacity totals between the first and third nodes and the third and second nodes and that arise from demands that originate or terminate at one of the nodes of the chain, and with w loc values given, a difference remaining being express flow (w exp ) accumulations of demands between the first and third nodes and the third and second nodes and that flow entirely through the chain of nodes but do not originate or terminate at any node of the chains of nodes; detecting a span failure between the first node and the second node; and treating the restoration of local flows and express flows differently by: A) looping back local flows from the third node to the first node; and B) failing back express flows from the third node to the first node and routing express flows failed back from the third node to the first node onto spans with spare capacity other than spans between nodes in the chain of nodes, wherein an amount of sparing on a chain is determined by the w loc having a largest value.