11-23
Cisco ONS 15454 SDH Reference Manual, R5.0
April 2008
Chapter 11 SDH Topologies and Upgrades
11.4.2 SNCP Dual Ring Interconnect
Figure 11-21 ONS 15454 Traditional SDH Dual Ring Interconnect
Figure 11-22 shows ONS 15454 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 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