5-29
Cisco ONS 15327 User Documentation, R3.3
June 2002
Chapter 5 SONET Topologies
Subtending Rings
Step 4
Use the
“Switch UPSR Traffic” procedure on page 5-25
to initiate a FORCE switch to switch traffic
away from the node you are removing. Initiate a FORCE switch on all spans connected to the node you
are removing.
Step 5
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.
Caution
Traffic is not protected during a forced protection switch.
Step 6
Remove all fiber connections between the node being removed and the two neighboring nodes.
Step 7
Reconnect the fiber of the two neighboring nodes directly, west port to east port.
Step 8
Restart CTC so that the removed node is no longer visible.
Step 9
Open the Alarms tab of each newly-connected node and verify that the span cards are free of alarms.
Resolve any alarms before proceeding.
Step 10
Use the
“Switch UPSR Traffic” procedure on page 5-25
to clear the protection switch.
5.4 Subtending Rings
The ONS 15327 supports up to ten SONET DCCs. Therefore, one ONS 15327 node can terminate and
groom any one of the following ring combinations:
•
5 UPSRs, or
•
4 UPSRs and 1 BLSR, or
•
2 BLSRs
Subtending rings from an ONS 15327 reduces the number of nodes and cards required and reduces
external shelf-to-shelf cabling.
shows an ONS 15327 with multiple subtending rings.
Figure 5-24 An ONS 15327 with subtending rings
UPSR
UPSR
51806
Summary of Contents for ONS 15327
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