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Chapter 12
SONET Topologies and Upgrades
12.4.2 Path Protection DRI
Figure 12-21
Integrated BLSR DRI on the Edit Circuits Window
12.4.2 Path Protection DRI
Figure 12-22
shows ONS 15454 nodes in a traditional drop-and-continue path protection 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 between Node 4 (Ring 1) and Node 6 (Ring 2), and between Node 5
(Ring 1) and 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).
Cisco ONS 15454 Reference Manual, R8.5
12-23
78-18106-01
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