Cisco ONS 15454 Reference Manual page 385

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SONET Topologies and Upgrades

All circuits originating on Node 0 that carried traffic to Node 2 on Fiber 2 are switched to the protect

bandwidth of Fiber 1. For example, a circuit carrying traffic on STS-1 on Fiber 2 is switched to

STS-25 on Fiber 1. A circuit carried on STS-2 on Fiber 2 is switched to STS-26 on Fiber 1. Fiber 1

carries the circuit to Node 3 (the original routing destination). Node 3 switches the circuit back to

STS-1 on Fiber 2 where it is routed to Node 2 on STS-1.

Circuits originating on Node 2 that normally carried traffic to Node 0 on Fiber 1 are switched to the

protect bandwidth of Fiber 2 at Node 3. For example, a circuit carrying traffic on STS-2 on Fiber 1

is switched to STS-26 on Fiber 2. Fiber 2 carries the circuit to Node 0 where the circuit is switched

back to STS-2 on Fiber 1 and then dropped to its destination.

Four-Node, Two-Fiber BLSR Traffic Pattern Sample

shows how traffic is rerouted following a line break between Node 0 and Node 3.

12.2 12.2.1 Two-Fiber BLSRs

Traffic flow

Cisco ONS 15454 Reference Manual, R7.0.1