Clear The Los (Bits) Alarm - Cisco NCS 2000 series Troubleshooting Manual

Clear the LOS (BITS) Alarm

Clear the LOS (BITS) Alarm
Caution Always use the supplied electrostatic discharge wristband when working with a powered NCS system. Plug
the wristband cable into the ESD jack located on the lower-right edge of the shelf assembly.
SUMMARY STEPS
1. Verify the wiring connection from the BITS clock pin fields on the NCS system backplane to the timing
source.
2. If wiring is good, verify that the BITS clock is operating properly.
DETAILED STEPS
Step 1 Verify the wiring connection from the BITS clock pin fields on the NCS system backplane to the timing source.
Step 2
If wiring is good, verify that the BITS clock is operating properly.
If the condition does not clear, log into the Technical Support Website at
for more information or call Cisco TAC (1 800 553-2447).
LOS (ESCON)
Default Severity: Critical (CR), Service-Affecting (SA)
Logical Object: ESCON
The ESCON LOS alarm occurs on the TXP_MR_2.5G or TXPP_MR_2.5G card when there is a loss of signal
for this payload, usually due to a physical error such as incorrect cabling connections, faulty cabling, or a
break. It can also be caused by an incorrectly configured SFP.
Clear the LOS (ESCON) Alarm
SUMMARY STEPS
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Cisco NCS 2000 series Troubleshooting Guide, Release 11.0
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Check for any upstream equipment failures that could cause the ESCON LOS alarm in this node.
If there is no cause upstream, verify cabling continuity from the transmitting port to the receiving port
reporting this LOS. To verify cable continuity, follow site practices.
If the continuity is good, clean the fiber according to site practice. If none exists, complete the
fiber-cleaning procedure in the Maintain the Node chapter in the Configuration guide.
Ensure that the PPM (SFP) is correctly configured for this payload:
If the physical cabling and PPM (SFP) are good but the alarm does not clear, verify that the correct port
is actually in service:
If the correct port is in service but the alarm has not cleared, use an optical test set to confirm that a
valid signal exists on the line. For specific procedures to use the test set equipment, consult the
manufacturer. Test the line as close to the receiving card as possible.
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Alarm Troubleshooting