Subtending Rings; Figure 5-24 An Ons 15327 With Subtending Rings - Cisco ONS 15327 User Documentation

Chapter 5 SONET Topologies
Use the
Step 4
away from the node you are removing. Initiate a FORCE switch on all spans connected to the node you
are removing.
If the removed node was the BITS timing source, select a new node as the BITS source or select another
Step 5
node as the master timing node.
Traffic is not protected during a forced protection switch.
Caution
Remove all fiber connections between the node being removed and the two neighboring nodes.
Step 6
Reconnect the fiber of the two neighboring nodes directly, west port to east port.
Step 7
Restart CTC so that the removed node is no longer visible.
Step 8
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

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:
•
•
•
Subtending rings from an ONS 15327 reduces the number of nodes and cards required and reduces
external shelf-to-shelf cabling.

Figure 5-24 An ONS 15327 with subtending rings

June 2002
"Switch UPSR Traffic" procedure on page 5-25
"Switch UPSR Traffic" procedure on page 5-25
5 UPSRs, or
4 UPSRs and 1 BLSR, or
2 BLSRs
UPSR
to initiate a FORCE switch to switch traffic
to clear the protection switch.
Figure 5-24 shows an ONS 15327 with multiple subtending rings.
UPSR
Cisco ONS 15327 User Documentation, R3.3
Subtending Rings
5-29