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Subtending Rings
d.
Step 4
From the node that will be deleted, remove the east and west span fibers. At this point, the node should
no longer be a part of the ring.
Step 5
Reconnect the span fibers of the nodes remaining in the ring.
Step 6
Open the Alarms tab of each newly-connected node and verify that the span cards are free of alarms.
Resolve any alarms before proceeding.
One circuit at a time, delete and recreate each circuit that passed through the deleted node on different
Step 7
STSs.
Note
Use the
Step 8
5.4 Subtending Rings
The ONS 15454 supports up to ten SONET DCCs. Therefore, one ONS 15454 node can terminate and
groom any one of the following ring combinations:
•
•
•
Subtending rings from an ONS 15454 reduces the number of nodes and cards required and reduces
external shelf-to-shelf cabling.
Cisco ONS 15454 Installation and Operations Guide
5-36
Click Yes when prompted.
If the removed node was the BITS timing source, select a new node as the BITS source or
select another node as the master timing node.
"Switch UPSR Traffic" procedure on page 5-32
5 UPSRs, or
4 UPSRs and 1 BLSR, or
3 UPSRs and 2 BLSRs
to clear the protection switch.
Figure 5-28
shows an ONS 15454 with multiple subtending rings.
Chapter 5
SONET Topologies
78-13453-01
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