Four-Fiber Blsr Span Switch; Figure - Cisco 15454-DS1-14= - 1.544Mbps Expansion Module Reference Manual

12.2.2 Four-Fiber BLSRs

Figure 12-5

Node 3
• Ring switching
the working and protect fibers fail on the same span. In a ring switch, traffic is routed to the protect
fibers throughout the full ring.
Cisco ONS 15454 Reference Manual, R8.5
12-8

Four-Fiber BLSR Span Switch

Node 0
Span 4
Span 5
OC-48 Ring
Span 6
Span 3
Node 2
(Figure 12-6) occurs when a span switch cannot recover traffic, such as when both
Chapter 12
Span 1
Span 8
Node 1
Span 7
Span 2
= Working fibers
= Protect fibers
SONET Topologies and Upgrades
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