Cisco ONS 15454 SDH Specifications download pdf (Page 249)

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Cisco ONS 15454 SDH Installation and Operations Guide, R3.3

May 2002

Chapter 5 SDH Topologies

Extended SNCP Mesh Networks

For example, in Figure 5-42, a circuit is created from Node 3 to Node 9. CTC determines that the shortest

route between the two nodes passes through Node 8 and Node 7, shown by the dotted line; CTC then

automatically creates cross-connections at Nodes 3, 8, 7, and 9 to provide the primary circuit path.

If full protection is selected, CTC creates a second unique route between Nodes 3 and 9 which, in this

example, passes through Nodes 2, 1, and 11. Cross-connections are automatically created at Nodes, 3,

2, 1, 11, and 9, shown by the dashed line. If a failure occurs on the primary path, traffic switches to the

second circuit path. In this example, Node 9 switches from the traffic coming in from Node 7 to the

traffic coming in from Node 11 and service resumes. The switch occurs within 50 ms.

Figure 5-42 An extended SNCP mesh network

Extended SNCPs also allow spans of different SDH line rates to be mixed together in “virtual rings.”

Figure 5-43 on page 5-60 shows Nodes 1, 2, 3, and 4 in a standard STM-16 ring. Nodes 5, 6, 7, and 8

link to the backbone ring through STM-4 fiber. The “virtual ring” is formed by Nodes 5, 6, 7, and 8 uses

both STM-16 and STM-4 speeds.

= 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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