Cisco NCS 2000 series Troubleshoot Manual

en/us/support/web/tsd-cisco-worldwide-contacts.html to obtain a directory of toll-free Technical Support numbers for
your country.
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 Fix a Fiber Cut; if the network ALS setting is DISABLE, go to Fix a Fiber Cut.
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 for more information or log into http://www.cisco.com/c/
en/us/support/web/tsd-cisco-worldwide-contacts.html to obtain a directory of toll-free Technical Support numbers for
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).
Cisco NCS 2000 series Troubleshooting Guide, Release 11.0
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Alarm Troubleshooting
LOS (OTS)

Cisco NCS 2000 series Specifications

General

Brand	Cisco
Model	NCS 2000 series
Category	Network Hardware
Language	English