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Cisco ONS 15600 SDH Reference Manual, Release 9.0
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Chapter 8 SDH Topologies and Upgrades
8.5.2 SNCP DRI
Figure 8-12
ONS 15600 SDH Traditional SNCP Dual-Ring Interconnect
shows ONS 15600 SDHs in an integrated DRI topology. The same drop-and-continue traffic
routing occurs at two nodes, rather than four. This is achieved by installing an addition STM-N trunk at
the two interconnect nodes.
Path Selector
Primary Path—Primary
Return Path—Secondary
Return Path—Primary
Primary Path—Secondary
SNCP
Ring 1
Duplicate
Signals
Pass-through
Node
SNCP
Ring 2
Bridge
159567
Node 1
Node 2
Node 3
Node 5
Node 4
Node 7
Node 6