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Cisco ONS 15454 SDH Reference Manual, R5.0
April 2008
Chapter11 SDH Topologies and Upgrades
11.2.4 MS-SPRing Application Samp le
11.2.4 MS-SPRing Application Sample
Figure 11-8 shows a sample two-fiber MS-SPRing implementation with five nodes. A regional
long-distance network connects to other carriers at Node 0. Traffic is delivered to the service provider’s
major hubs.
Carrier 1 delivers six E-3s over two STM-1 spans to Node 0. Carrier 2 provides twelve E-3s directly.
Node 0 receives the signals and delivers them around the ring to the approp riate node.
The ring also brings 14 E-1s back from each remote site to Node 0. Intermediate nodes ser ve these
shorter regional connections.
The ONS 15454 SDH STM-1 card supports a total of four STM-1 ports so that two additional STM-1
spans can be added at little cost.
Figure11-8 Five-Node, Two-Fiber MS-SPRing
Node 0
56 local
E-1s 4 E-3s 14 E-1s
14 E-1s
14 E-1s
14 E-1s
8 E-3s
4 E-3s
2 E-3s
Carrier 1
2 STM-1s
Node 1
Node 2
Node 3
Node 4
= Fiber 1
= Fiber 2
Carrier 2
12 E-3s
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