Datasheet

Table Of Contents
12-22
Cisco ONS 15454 SDH Reference Manual, R7.0
October 2008
Chapter 12 SDH Topologies and Upgrades
12.4.2 SNCP Dual Ring Interconnect
Figure 12-21 ONS 15454 Traditional SDH Dual Ring Interconnect
Figure 12-22 shows ONS 15454 SDH nodes 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 additional 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
E1/E3/DS3I/GigE
Duplicate
Signals
Pass-through
Node
SNCP
Ring 2
E1/E3/DS3I/GigE
Bridge
90392
Node #1
Node #2Node #3
Node #5Node #4
Node #7Node #6