1-78
Cisco ONS 15454 DWDM Troubleshooting Guide, R7.0.1
78-17742-02
Chapter 1 General Troubleshooting
1.12.2 System Restart after a Fiber Cut
Step 1 Verify the alarm validity.
Step 2 For both DWDM nodes on the repaired span:
a. Double-click the card reporting the issue.
b. Click Conditions.
c. Click Retrieve and verify that an APC-OUT-OF-RANGE condition is present on an aggregate port.
d. If the alarm is correctly reported, go to Step 3. If not, close the CTC application, delete the CTC
cache, and open the CTC connection again. Then, go to Step 1.
Note If the discrepancy persists, log into the Technical Support Website at
http://www.cisco.com/techsupport for more information or call Cisco TAC (1 800 553-2447) in
order to report a service-affecting problem.
Step 3 Measure the new Span Loss value after the fiber is repaired.
a. In the node view (single-shelf mode) or shelf view (multishelf mode) of both nodes for to the span,
click the Maintenance > DWDM > WDM Span Check tabs.
b. Click Retrieve Span Loss Values to retrieve the latest loss data.
Note The two values retrieved at each node level (west side and east side) refer to the two fibers
coming into the node from the adjacent nodes, so they apply to different spans. To complete the
measurement in Step 4, the appropriate values must be taken into account.
Step 4 Compare the Span Measurements done in Step 3 with the Span Losses values used during the network
design with Cisco MetroPlanner.
Step 5 For the two fibers belonging to the repaired span, identify the one for the W–E line direction.
• If the Span Loss Change is greater than 1 dBm, continue with Step 6.
• If the Span Loss Change is 1 dBm or less, move to Step 9.
Step 6 Clean the LINE-RX and LINE-TX connectors of the DWDM cards that manage the fiber of the repaired
span.
Step 7 If the problem persists, continue with the next step. If not, you have finished the corrective action.
Step 8 If the Span Loss Change is greater than 1 dBm and the APC-OUT-OF-RANGE condition still exists, it
is mandatory to again repair the fibers to reestablish the expected span loss value.
Warning
Invisible laser radiation may be emitted from the end of the unterminated fiber cable or connector. Do
not view directly with optical instruments. Viewing the laser output with certain optical instruments
(for example, eye loupes, magnifiers, and microscopes) within a distance of 100 mm may pose an eye
hazard.
Statement 1056
Note Before disconnecting any optical amplifier card fiber for troubleshooting, ensure that the optical
amplifier card is unplugged.
To Next Page
Loading...
Need help?
General
