Four-Fiber Blsrs; Figure; Four-Node, Two-Fiber Blsr Traffic Pattern Following Line Break - Cisco 15454-DS1-14= - 1.544Mbps Expansion Module Reference Manual

12.2.2 Four-Fiber BLSRs

Figure 12-3

Node 3
12.2.2 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 must install four OC-48, OC-48 AS, or OC-192 cards at each BLSR
node.
Cisco ONS 15454 Reference Manual, R8.5
12-6

Four-Node, Two-Fiber BLSR Traffic Pattern Following Line Break

Node 0
OC-48 Ring
Node 2
Chapter 12 SONET Topologies and Upgrades
Node 1
Traffic flow
Fiber 1
Fiber 2
Figure 12-4. To
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