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8-5
Cisco ONS 15600 Reference Manual, R7.2
Chapter 8 SONET Topologies and Upgrades
8.3.2 Four-Fiber BLSRs
Figure 8-4 Four-Node, Two-Fiber BLSR Traffic Pattern Following Line Break
8.3.2 Four-Fiber BLSRs
Four-fiber BLSRs double the bandwidth of two-fiber BLSRs. Because they allow span switching as well
as ring switching, four-fiber BLSRs increase the reliability and flexibility of traffic protection. Two
fibers are allocated for working traffic and two fibers for protection, as shown in Figure 8-5. To
implement a four-fiber BLSR, you can install either two or four OC-48 or OC-192 cards at each BLSR
node, or a single ASAP card at each node. (Each ASAP card provides up to sixteen OC-48 ports or four
OC-192 ports. Refer to the “2.8 ASAP Card” section on page 2-19 for more information.)
Node 0
Node 1
Node 2
Node 3 OC-48 Ring
96673
Traffic flow
Fiber 1
Fiber 2