Los (Ots) - Cisco NCS 2000 series Troubleshooting Manual

Alarm Troubleshooting
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LOS (OTS)

Default Severity: Critical (CR), Service-Affecting (SA)
Logical Object: OTS
The Loss of Signal for the OTS applies to the OSC-3-RX port of the OPT-BST, OPT-AMP-C, or
OPT-AMP-17-C amplifier card, LINE-2-RX port of the OSCM or OSC-CSM card, and LINE-RX port of the
40-SMR1-C or 40-SMR2-C card. It indicates that a fiber cut has occurred and no power is being received
from the span. The alarm is raised when both LOS-P and LOS-O alarms occur, and demotes them.
Clear the LOS (OTS) Alarm
SUMMARY STEPS
1. To troubleshoot this alarm, see the steps below.
2. Isolate the span affected by the fiber cut.
3. Verify the alarm is valid, then perform the following steps for both DWDM nodes connected to the span
identified in Step 1.
4. If the network ALS setting on the DWDM nodes that you are troubleshooting is Auto Restart, continue
with
5. 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:
6. Repair the identified broken fiber to restore the internode link.
DETAILED STEPS
Step 1 To troubleshoot this alarm, see the steps below.
If the alarm does not get cleared, you need to report a Service-Affecting (SA) problem. Log into the Technical Support
Website at http://www.cisco.com/c/en/us/support/index.html
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your country.
Step 2
Isolate the span affected by the fiber cut.
a) Go to CTC network view.
b) Identify the span connection that is gray.
Step 3 Verify the alarm is valid, then perform the following steps for both DWDM nodes connected to the span identified in
Step 1.
a) Double-click the card directly connected to the span (either the OPT-BST or the OSC-CSM).
Fix a Fiber Cut; if the network ALS setting is DISABLE, go to
to obtain a directory of toll-free Technical Support numbers for
for more information or log into
to obtain a directory of toll-free Technical Support numbers for
Cisco NCS 2000 series Troubleshooting Guide, Release 11.0
LOS (OTS)
Fix a Fiber Cut.
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