Network Protection

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. [...]

In many national transport networks such as US networks, there is a type of special sub-topology. That is, between two hub nodes with high nodal degrees, there are several degree-two nodes connected in a chain. Figure 1 shows an example of such a type of node chain, in which node 1 and node 4 are [...]