11-23
Cisco ONS 15454 SDH Reference Manual, R5.0
April 2008
Chapter11 SDH Topologies and Up grades
11.4.2 SNCP Dual Ring Interconnect
Figure11-21 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