12-11
Cisco ONS 15454 Reference Manual, R7.0.1
OL-9217-01
Chapter 12 SONET Topologies and Upgrades
12.2 12.2.4 BLSR Application Example
• The ONS 15454 OC-3 card supports a total of four OC-3 ports so that two additional OC-3 spans
can be added at little cost.
Figure 12-8 Five-Node Two-Fiber BLSR
Figure 12-9 shows the shelf assembly layout for Node 0, which has one free slot.
Node 0
56 local
DS-1s 4 DS-3s 14 DS-1s
14 DS-1s
14 DS-1s
14 DS-1s
8 DS-3s
4 DS-3s
2 DS-3s
Carrier 1
2 OC-3s
Node 1
Node 2
Node 3
Node 4
= Fiber 1
= Fiber 2
32138
Carrier 2
12 DS-3s
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