5-9
Cisco ONS 15454 Installation and Operations Guide
November 2001
Chapter5 SONET Topologies
Bidirectional Line Switched Rings
Figure5-8 A five-node BLSR
Figure 5-9 shows the shelf assembly layout for Node 0, which has one free slot. Figure 5-10 shows the shelf assembly layout for the remaining sites in the ring. In this BLSR configuration, an additional eight DS-3s at Node IDs 1 and 3 can be activated. An additional four DS-3s can be added at Node ID 4, and ten DS-3s can be added at Node ID 2. Each site has fr ee s lo ts fo r futur e tra ffic nee ds.
Node 0
56 local
DS-1s 4 DS-1s 14 DS-1s
14 DS-1s
14 DS-1s
14 DS-1s
8 DS-3s
4 DS-1s
2 DS-1s
Carrier 1
2 OC-3s
Node 1
Node 2
Node 3
Node 4
= Fiber 1
= Fiber 2
32138
Carrier 2
12 DS-3s