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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
• 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.
Note The new value of the fiber Insertion Loss of this fiber after restoration must be less than 5
dB higher than the previous Insertion Loss value. If possible, try to recover the original value
by making a better fiber splice. If this is not possible, use the new value (must be less than
5 dB higher than the previous value) and rerun Cisco MetroPlanner to revalidate the new
condition.
Step 3 For the two fibers belonging to the repaired span, identify one for the east to west (E–W) line direction.
Step 4 Repeat the procedure starting at Step 2 for the E–W direction.
Step 5 Clean the LINE-RX and LINE-TX connectors for the failing fiber that was identified in the previous
steps.
Step 6 If the problem persists, continue with Step 7. Otherwise, the corrective action is finished.
Step 7 Repair the failing fiber again until the expected OSC link is reestablished.
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.
Note If the OSC link cannot be reestablished (either by splicing or replacing the fiber), and the new
value of Span Loss cannot be modified, 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.
1.12.2.2 Scenario 2: Span Loss Change > 5 dBm and OSC Power Value on the Receiver > –42 dBm
In network view, both of the lines representing the span change to green; however, the status of the
OCHNC circuits relating to the repaired span remains Partial, instead of Complete (due to the fiber cut).
This change is due to the fact the physical optical power value received by the OSC transceiver is above
the sensitivity limit (–42 dBm) and consequently, the OSC optical link can be rebuilt, allowing the
restoration of the Section DCC (SDCC) or multiplex section DCC (MS-DCC). The network view for this
condition is shown in Figure 1-28.
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