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Cisco ONS 15454 SDH Installation and Operations Guide, R3.3
May 2002
Chapter 5 SDH Topologies
Creating MS-SPRings
Figure 5-13 Four-node, two-fiber MS-SPRing traffic pattern following line break
5.4.1.1Sample MS-SPRing Application
Figure 5-14 shows a sample two-fiber MS-SPRing implementation. 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 appropriate node.
• The ring also brings 14 E-1s back from each remote site to Node 0. Intermediate nodes serve 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.
Node 0
Node 1
Node 2
Node 3 STM-16 Ring
Traffic flow
Fiber 1
Fiber 2
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