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Cisco ONS 15454 Reference Manual, R7.0.1
OL-9217-01
Chapter 12 SONET Topologies and Upgrades
12.6 12.6 Four-Shelf Node Configurations
Figure 12-15 PPMN Virtual Ring
12.6 Four-Shelf Node Configurations
You can link multiple ONS 15454s using their OC-N cards (that is, create a fiber-optic bus) to
accommodate more access traffic than a single ONS 15454 can support. Refer to the Cisco ONS 15454
Procedure Guide. For example, to drop more than 112 DS-1s or 96 DS-3s (the maximum that can be
aggregated in a single node), you can link the nodes but not merge multiple nodes into a single
ONS 15454. You can link nodes with OC-12 or OC-48 fiber spans as you would link any other two
network nodes. The nodes can be grouped in one facility to aggregate more local traffic.
Figure 12-16 on page 12-18 shows a four-shelf node setup. Each shelf assembly is recognized as a
separate node in the ONS 15454 software interface and traffic is mapped using CTC cross-connect
options. In Figure 12-16, each node uses redundant fiber-optic cards. Node 1 uses redundant OC-N
transport and OC-N bus (connecting) cards for a total of four cards, with eight free slots remaining.
Nodes 2 and 3 each use two redundant OC-N bus cards for a total of four cards, with eight free slots
remaining. Node 4 uses redundant OC-12 bus cards for a total of two cards, with ten free slots remaining.
The four-shelf node example presented here is one of many ways to set up a multiple-node configuration.
OC-48
OC-12OC-12
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ONS 15454
Node 5
ONS 15454
Node 1
ONS 15454
Node 6
ONS 15454
Node 2
ONS 15454
Node 4
ONS 15454
Node 8
ONS 15454
Node 3
ONS 15454
Node 7
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