Because of the network topology, several possibilities are given to route the data service between NE82 to NE80.

For the example we will chose the established STM4 link between NE82 and NE81 and STM16 Link1 between NE81 and NE80.

Regarding the network plan, it would also be possible to route a protected Path for this data service via the STM4 or STM1 link between NE82 and NE81 via NE83 and STM16 Link 1 between NE81 and NE82. The procedure for routing a protected Path besides the working Path will be explained briefly during the following provisioning example.