Cisco NCS 2000 series Troubleshooting Manual page 113

General Troubleshooting
Corrective Action for Scenario 1
SUMMARY STEPS
1. Follow these steps to verify the alarms for both DWDM nodes that are connected to the repaired span:
2. Isolate the fiber affected by the excessive insertion loss. For the two fibers belonging to the span, identify
the one for the W–E line direction.
3. For the two fibers belonging to the repaired span, identify one for the east to west (E–W) line direction.
4. Repeat the procedure starting at Step 2 for the E–W direction.
5. Clean the LINE-RX and LINE-TX connectors for the failing fiber that was identified in the previous steps.
6. If the problem persists, continue with Step 7. Otherwise, the corrective action is finished.
7. Repair the failing fiber again until the expected OSC link is reestablished.
DETAILED STEPS
Step 1 Follow these steps to verify the alarms for both DWDM nodes that are connected to the repaired span:
a) Double-click the card directly connected to the span (either the OPT-BST, OPT-AMP-C, OPT-AMP-17-C, or
OSC-CSM).
b) Click the Alarms tab.
c) Verify that a LOS condition is present on the LINE-RX port.
d) Click the Synchronize button on the bottom left of the window.
e) If the alarm is correctly reported, move to Step 2. If not, close the CTC application and delete the CTC cache. Then
reopen the CTC connection, and repeat Step 1.
If the "gray condition" of the span persists, log into Technical Support Website at
support/index.html
problem.
Step 2
Isolate the fiber affected by the excessive insertion loss. For the two fibers belonging to the span, identify the one for the
W–E line direction.
a) Go into the upstream node and identify the OSCM or OSC-CSM card that manages the OSC termination for the
faulty span.
b) Double-click the card, then click the Maintenance tab.
c) Force the OSC-TX laser active by setting ALS Mode to DISABLE.
d) Go into the downstream node and verify the OSC Power level received.
• If a pair of OPT-BST, OPT-AMP-C, or OPT-AMP-17-C + OSCM cards terminate the OSC connection, click
the Provisioning > Optical Line > Parameters tabs, then verify that there is power for OSC-TX (Port 4).
• If an OSC-CSM terminates the OSC connection, click the Provisioning > Optical Line > Parameters tabs,
then verify that there is power for OSC-RX (Port 6).
• If no power is detected and the LOS (OC-3) alarm persists, the faulty fiber has been identified, so go to Step 3.
e) If a power value greater than –42 dBm is detected, the fiber under test has been properly repaired. However, it is
recommended that you check the new fiber Insertion Loss value.
• In node view (single-shelf mode) or shelf view (multishelf mode), click the Maintenance > DWDM > WDM
Span Check tabs.
• Retrieve the new value of fiber Insertion Loss of the repaired span.
for more information or call Cisco TAC ( 1 800 553-2447) in order to report a service-affecting
Cisco NCS 2000 series Troubleshooting Guide, Release 11.0
Corrective Action for Scenario 1
http://www.cisco.com/c/en/us/
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