Four-Fiber Blsrs; Figure 5-3 Four-Node, Two-Fiber Blsr Traffic Pattern Following Line Break - Cisco 15454-TCC - Network Processor Card Operation Manual

Bidirectional Line Switched Rings
Figure 5-3
Node 3

5.2.2 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 or OC-48AS cards, or four OC-192 cards at
each BLSR node.
Cisco ONS 15454 Installation and Operations Guide
5-4
Four-node, two-fiber BLSR traffic pattern following line break
Node 0
OC-48 Ring
Node 2
Chapter 5 SONET Topologies
Node 1
Traffic flow
Fiber 1
Fiber 2
Figure 5-4. To
78-13453-01