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Cisco ONS 15454 DWDM Troubleshooting Guide, R7.0.1
78-17742-02
Chapter 1 General Troubleshooting
1.12.1 Fiber Cut Detection
b. Click the Alarms tab and verify that a LOS condition is present on the LINE-RX port. If the alarm
is correctly reported, move to Step 3. If not, close the CTC application, delete the CTC cache and
reopen the CTC connection.
c. Click the Synchronize button on the bottom left of the window.
Note If the “gray” condition of the span persists, log into the Technical Support website at
http://www.cisco.com/techsupport for more information or call Cisco TAC (1-800-553-2447) to
report a service-affecting problem.
Step 3 If the network ALS setting on the DWDM nodes that you are troubleshooting is Auto Restart, continue
with Step 4; if the network ALS setting is DISABLE, go to Step 5.
Note The network ALS setting is a function of the ALS mode configured on the appropriate cards in the
sy stem (OPT-BST, OPT-BST-E, OP T-BST-L, OPT-AMP-L, OSC-CSM, and OSCM).
Step 4 Isolate the fiber affected by the fiber cut. For the two fibers belonging to the span, identify the fiber
belonging to the west-to-east (W–E) line direction:
a. Go into the upstream node and identify the OSCM or OSC-CSM card managing the OSC
termination referring to the faulty span.
b. Double-click the card, then click the Maintenance Panel tab.
c. Force the OSC-TX laser to be active by setting the ALS Mode to DISABLE.
d. Go into the downstream node and verify if OSC power is being received.
• If a pair of OPT-BST + 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).
e. If no power is detected and the LOS (OC-3) alarm persists, go to Step 5; otherwise, the fiber under
test is good. In this case, go to Step f to check the other fiber.
f. Repeat Steps a to d for the other fiber to verify that it is at fault.
Step 5 Repair the identified broken fiber to restore the internode link.
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.
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