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Chapter 8 SDH Topologies and Upgrades
8.5.2 SNCP DRI
Figure 8-11
ONS 15600 SDH Integrated MS-SPRing Dual-Ring Interconnect
8.5.2 SNCP DRI
shows ONS 15600 SDHs in a traditional drop-and-continue SNCP DRI topology. In Ring 1,
Nodes 4 and 5 are the interconnect nodes, and in Ring 2, Nodes 6 and 7 are the interconnect nodes.
Duplicate signals are sent from Node 4 (Ring 1) to Node 6 (Ring 2), and from Node 5 (Ring 1) to Node 7
(Ring 2). In Ring 1, traffic at Node 4 is dropped (to Node 6) and continued (to Node 5). Similarly, at
Node 5, traffic is dropped (to Node 7) and continued (to Node 4).
Service Selector
Secondary Path (protection)
Primary Path (working)
159571
MS-SPRing 1
Primary
Secondary
Secondary
Primary
MS-SPRing 2
Node 8
Node 3
Node 1
Node 2
Node 6
Node 7
Node 5
Node 4