| 摘要 |
To restore a failed working path (WP) in a transport network, a restoration request is relayed between adjacent network elements (NE1, NE2) and the path set up hop by hop over spare resources by establishing local crossconnections (CC1, CC2) conforming to the request according to routing information locally stored within the network elements. During failure free operation, a low priority path (LPP A) for extra traffic with different signal structure is allowed on the spare resources and pre-empted in the case of a failure. The restoration request is forwarded using the old signal structure of the extra traffic path. Only after reception of a confirmation sent back by the peering node (NE2) using the new signal structure, the I/O port (211) is also reconfigured to the new signal structure.
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