Four-Fiber Blsrs - Cisco ONS 15600 Series Reference Manual

Chapter 8 SONET Topologies and Upgrades
Figure 8-4
Node 3

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
implement a four-fiber BLSR, you can install either two or four OC-48 or OC-192 cards at each BLSR
node.
Four-Node, Two-Fiber BLSR Traffic Pattern Following Line Break
Node 0
OC-48 Ring
Node 2
8.3.2 Four-Fiber BLSRs
Node 1
Traffic flow
Fiber 1
Fiber 2
Figure
Cisco ONS 15600 Reference Manual, R7.0
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