Datasheet

Table Of Contents
12-9
Cisco ONS 15454 SDH Reference Manual, R7.0
October 2008
Chapter 12 SDH Topologies and Upgrades
12.2.4 MS-SPRing Application Sample
Table 12-3 shows the bidirectional bandwidth capacities of four-fiber MS-SPRings.
Figure 12-7 shows an example of MS-SPRing bandwidth reuse. The same VC4 carries three different
traffic sets simultaneously on different spans on the ring: one set from Node 3 to Node 1, one set from
Node 1 to Node 2, and another set from Node 2 to Node 3.
Figure 12-7 MS-SPRing Bandwidth Reuse
12.2.4 MS-SPRing Application Sample
Figure 12-8 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 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.
Table 12-3 Four-Fiber MS-SPRing Capacity
STM Rate Working Bandwidth Protection Bandwidth Ring Capacity
STM-16 VC4 1-16 (Fiber 1) VC4 1-16 (Fiber 2) 16 x N – PT
STM-64 VC4 1-64 (Fiber 1) VC4 1-64 (Fiber 2) 64 x N – PT
VC4#1 VC4#1
VC4#1 VC4#1
Node 0
Node 1
Node 2
Node 3
71490
= Node 3 – Node 1 traffic
= Node 1 – Node 2 traffic
= Node 2 – Node 3 traffic