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Cisco ONS 15600 Reference Manual page 164

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8.5.1 MS-SPRing DRI

drop-and-continue traffic routing occurs at two nodes, rather than four. This is achieved by installing an

additional STM-N trunk at the two interconnect nodes. Nodes 3 and 8 are the interconnect nodes.

Cisco ONS 15600 SDH Reference Manual, Release 9.0

ONS 15600 SDH Traditional MS-SPRing Dual-Ring Interconnect (Opposite-Side

Drop and Continue

Service Selector

Primary Path, Drop and Continue to Bridge

Secondary Path

shows ONS 15600 SDHs in an integrated MS-SPRing DRI topology. The same

Chapter 8 SDH Topologies and Upgrades