Cisco ONS 15454 - Page 396

Cisco ONS 15454

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12-16

Cisco ONS 15454 Reference Manual, R7.0.1

OL-9217-01

Chapter 12 SONET Topologies and Upgrades

12.5 12.5 Path-Protected Mesh Networks

Figure 12-14 Path-Protected Mesh Network

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

Figure 12-15 shows Nodes 1, 2, 3, and 4 in a standard OC-48 ring. Nodes 5, 6, 7, and 8 link to the

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.

= Primary path

= Secondary path

Working traffic

Protect traffic

Source

Node

Destination

Node

32136

Node 1

Node 11

Node 2

Node 4

Node 5

Node 6

Node 7

Node 8Node 10

Node 9

Node 3

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