Cisco ONS 15454 Reference Manual page 396

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12.5 12.5 Path-Protected Mesh Networks

Figure 12-14

PPMN also allows spans with different SONET speeds to be mixed together in "virtual rings."

Figure 12-15

backbone ring through OC-12 fiber. The "virtual ring" formed by Nodes 5, 6, 7, and 8 uses both OC-48

and OC-12 cards.

Cisco ONS 15454 Reference Manual, R7.0.1

Path-Protected Mesh Network

Protect traffic

shows Nodes 1, 2, 3, and 4 in a standard OC-48 ring. Nodes 5, 6, 7, and 8 link to the

SONET Topologies and Upgrades

= Primary path

= Secondary path