Network Protection

For network protection, two aspects are important: (a) spare capacity pre-planned for restoration and (b) restoration speed for failure recovery. For the latter, the current protection or restoration techniques can be classified into two groups. One is pre-planned techniques and the other is pre-configured techniques. A pre-configured technique inherent embeds spare capacity pre-plan. The pre-planned [...]

Pre-cross-connected trails (PXT) are a type of network protection technique similar to p-cycles. Rather than setting up complete circles like p-cycles, the PXT technique establishes open pre-cross-connected trails as protection path. Then depending on the location where a failure occurs, switch-over actions are taken at the two end nodes of a protected working path. Fig. [...]