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11-9
Cisco ONS 15454 SDH Reference Manual, R5.0
April 2008
Chapter 11 SDH Topologies and Upgrades
11.2.3 MS-SPRing Bandwidth
Table 11-3 shows the bidirectional bandwidth capacities of four-fiber MS-SPRings.
Figure 11-7 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 11-7 MS-SPRing Bandwidth Reuse
STM-16 VC4 1-8 VC4 9-16 8 x N – PT
STM-64 VC4 1-32 VC4 33-64 32 x N – PT
1. N equals the number of ONS 15454 SDH nodes configured as MS-SPRing nodes.
2. PT equals the number of VC4 circuits passed through ONS 15454 SDH nodes in the ring. (Capacity can vary
depending on the traffic pattern.)
Table 11-2 Two-Fiber MS-SPRing Capacity (continued)
STM Rate Working Bandwidth Protection Bandwidth Ring Capacity
Table 11-3 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