12-34
Cisco ONS 15454 Reference Manual, R8.5.x
78-18106-01
Chapter 12 SONET Topologies and Upgrades
12.10 STS around the Ring
Figure 12-33 Four-Shelf Node Configuration
12.10 STS around the Ring
You can provision STS circuits with a source endpoint and a destination endpoint on the same node, and
route the traffic around a ring. The circuit source and destination c an be on the same card, but you must
use two different ports on the card, see Figure 12-34 on page 12-35.
Manual routing is required for STS around the ring circuits amd “Route Automaticall y” must be
unchecked in the CTC circuit provisioning pane. STS around ring circuits created using Transaction
Language 1 (TL1) are discovered by CTC and the status “COMPLETE” is displayed. STS around the
ring supports circuit sizes; STS-1, 3c, 6c, 9c, 12c, 24c, 36c, 48c, and 192cs. Both unidirectional and
bidirectional circuits are supported, and STS around the ring cir cuits are CCAT only, VCAT is not
supported. STS around ring circuits are linear circuits.
Redundant
OC-N Bus
OC-N Feed
Redundant
OC-N Bus
Redundant
OC-N Bus
Up to 72 DS-3s, 84 DS-1s
Up to 72 DS-3s, 84 DS-1s
ONS 15454, Node 1
ONS 15454, Node 2
ONS 15454, Node 3
ONS 15454, Node 4
Redundant
Up to 72 DS-3s, 84 DS-1s
Up to 96 DS-3s, 112 DS-1s
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