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Cisco ONS 15454 Procedure Guide, R5.0
March 2007
Chapter 18 DLPs A100 to A199
DLP-A195 Verify Timing in a Reduced Ring
Step 5 To clear a Force switch on the east line:
a. Right-click the BLSR east port where you want to clear the protection switch and choose
Set East Protection Operation. Ports with a Force switch applied are marked with an F.
b. In the Set East Protection Operation dialog box, choose CLEAR from the drop-down list. Click OK.
c. In the Confirm BLSR Operation dialog box, click Yes .
On the BLSR network graphic, a green and a purple span line connects each node. This is the normal
display for BLSRs when protection operations are not invoked.
Step 6 From the File menu, choose Close.
Step 7 Return to your originating procedure (NTP).
DLP-A195 Verify Timing in a Reduced Ring
Step 1 In node view, click the Provisioning > Timing tabs.
Step 2 Observe the Timing Mode field to see the type of timing (Line, External, Mixed) that has been set for
that node.
Step 3 Scroll down to the Reference Lists and observe the NE Reference fields to see the timing references
provisioned for that node.
Step 4 If the removed node was the only BITS timing source, perform the following:
a. Contact your synchronization coordinator or appropriate personnel before continuing with this
procedure.
b. Look for another node on the ring that can be used as a BITS source and set that node’s Timing Mode
to External. Choose that node as the primary timing source for all other nodes in the ring. See the
“DLP-A157 Change the Node Timing Source” task on page 18-24.
c. If no node in the reduced ring can be used as a BITS source, choose one node to be your internal
timing source. Set that node’s Timing Mode to External, set BITS-1 and BITS-2 BITS In State to
OOS, and set the NE Reference to Internal. Then, choose line timing for all other nodes in the ring.
This forces the first node to be their primary timing source. (See the “DLP-A157 Change the Node
Timing Source” task on page 18-24.)
Note This type of timing conforms to Stratum 3 requirements and is not considered optimal.
Step 5 If the removed node was not the only BITS timing source, provision the adjacent nodes to line timing
using SONET links (east and west) as timing sources, traceable to the node with external BITS timing.
See the “NTP-A28 Set Up Timing” procedure on page 4-9.
Purpose This task verifies timing in the ring where you removed a node.
Tools/Equipment None
Prerequisite Procedures DLP-A60 Log into CTC, page 17-66
Required/As Needed As needed
Onsite/Remote Onsite/remote
Security Level Provisioning or higher
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