8-8
Cisco ONS 15600 SDH Reference Manual, Release 9.0
78-18400-01
Chapter 8 SDH Topologies and Upgrades
8.4 Subnetwork Connection Protection Rings
Figure 8-7
Basic Four-Node SNCP
If a fiber break occurs, Node 2 switches its active receiver to the protect signal coming through Node 3
(
ONS 15600 SDH
Node 0
ONS 15454 SDH
Node 1
ONS 15600 SDH
Node 2
ONS 15454 SDH
Node 3
159621
= Fiber 1 (working)
= Fiber 2 (protected)