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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
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) in order to
report a service-affecting problem.
Step 3 Measure the new Span Loss value after fixing the fiber.
a. In the node view (single-shelf mode) or shelf view (multishelf mode) of both nodes for 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 3, the appropriate values must be taken into account.
Step 4 Compare the span measurements of 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 fiber for the W–E line direction and
calculate the insertion loss variation. If the span loss change is greater than 3 dBm, continue with Step 6.
If not, go to Step 9.
Step 6 Clean the LINE-RX and LINE-TX connectors on the DWDM cards managing the fiber of the repaired
span. If the problem persists, continue with Step 7.
Step 7 If the alarm condition is still reported, it is recommended that the fiber be repaired again to reestablish
the expected span loss value. If this is not possible and the new value of span loss cannot be modified,
go to Step 8 to fix the system faulty condition.
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.
Step 8 Follow the signal flow into the network starting from the repaired fiber:
a. In the downstream node, identify the OPT-BST or OSC-CSM card that manages OSC and CHS
detection.
b. In card view, click the Provisioning > Optical Line > Optic Thresholds tabs.
c. Click the Alarms radio button, then click Refresh.
d. Decrease the current OSC and CHS Fail Low thresholds by the same amount of the span loss change
calculated in Step 5.
If an OPT-BST is present:
• CHS Fail Low threshold refers to Port 2.
• OSC Fail Low threshold refers to Port 4.
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