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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
If an OSC-CSM is present:
• CHS Fail Low threshold refers to Port 3.
• OSC Fail Low threshold refers to Port 6.
Step 9 For the two fibers belonging to the repaired span, identify the fiber for the east to west (E–W) line
direction.
Step 10 Repeat the procedure from Step 5 to Step 8 for the E–W direction.
Step 11 If the LOS alarm has cleared, the system has restarted properly. However, because a significantly
different span loss value is now present, we highly recommended that you complete the following steps:
a. Go back to the Cisco MetroPlanner tool and open the network design configuration file.
b. Select Installation Mode to freeze the node layout and amplifier positioning.
c. Change the span value, inserting the new insertion loss that was measured in Step 3.
d. Run the Cisco MetroPlanner algorithm to validate the new design.
e. If the optical result indications (power, optical signal-to-noise ratio [OSNR], chromatic dispersion
[CD], and so on) are all green, the repair procedure is complete. If not, log into the Technical
Support Website at http://www.cisco.com/techsupport for more information or call Cisco TAC
(1 800 553-2447) and report a service-affecting problem.
If the LOS alarm is still present, continue with Step 12.
Step 12 Go back to the card where the LOS alarm is active, and set the optic thresholds (see Step 8b) to the lowest
value allowed.
If an OPT-BST is present:
• CHS Fail Low threshold must to be set to –30 dBm.
• OSC Fail Low threshold must to be set to –42 dBm.
If an OSC-CSM is present:
• CHS Fail Low threshold must to be set to –30 dBm.
• OSC Fail Low threshold must to be set to –40 dBm.
Note If the LOS alarm is still present, 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 13 If the LOS alarm is has cleared, the system has restarted properly, but because a Span Loss value
significantly different from the design is now present, we highly recommend that you repeat the steps
described in Step 11.
1.12.2.3 Scenario 3: 3 dBm < Span Loss Change < 5 dBm
In network view, both of the lines representing the span change to green after the rebuild of the OSC
optical link and consequent restoration of the SDCC or MS-DCC. The EOC condition and the LOS
alarms are cleared.
The network ALS protocol successfully restarts the amplifiers, which enables the OCHNC traffic
restoration along the span.
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