12-17
Cisco ONS 15454 Reference Manual, R8.5.x
78-18106-01
Chapter 12 SONET Topologies and Upgrades
12.3 Path Protection
Figure 12-15 Four-Port, OC-3 Path Protection
Node ID 0 has four DS1-14 cards to provide 56 active DS-1 ports. The othe r sites only require two
DS1-14 cards to handle the eight DS-1s to and from the remot e switch. You can use the other half of
each ONS 15454 shelf assembly to provide support for a se cond or third ring to other existing or planned
remote sites.
In the OC-3 path protection sample, Node ID 0 contains four DS 1-14 cards and two OC3 IR 4 1310
cards. Six free slots can be provisioned with cards or left empty. Figure 12-16 shows the shelf setup for
these card.
8 DS-1s
8 DS-1s
8 DS-1s
TR-303
Switch
32149
ONS 15454
Node ID 0
ONS 15454
Node ID 1
ONS 15454
Node ID 2
ONS 15454
Node ID 3
= Fiber 1
= Fiber 2