5-6
Cisco ONS 15454 Installation and Operations Guide
78-13453-01
Chapter5 SONET Topologies
Bidirectional Line Switched Rings
Figure5-5 A four-fiber BLSR span switch
Figure5-6 A four-fiber BLSR ring switch
Node 0
Node 1
Node 2
Node 3
Span 1
Span 2Span 3
Span 4
Span 8
Span 7Span 6
Span 5
OC-48 Ring
= Working fibers
= Protect fibers
61959
Node 0
Node 1
Node 2
Node 3
Span 1
Span 2Span 3
Span 4
Span 8
Span 7Span 6
Span 5
OC-48 Ring
= Working fibers
= Protect fibers
61960