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Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, R7.0
Chapter2 Alarm Troubleshooting
2.7.143 LOP-V
Step4 If the error is not due to an incorrectly configured test set, the error is in the provisioned CTC circuit
size. Complete the “Delete a Circuit” procedure on page 2-155.
Step5 Recreate the circuit for the correct size. For procedures, refer to the “Create Circuits” chapter in the
Cisco ONS 15310-CL and Cisco ONS 15310-MA Procedure Guide.
Step6 If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/techsupport
for more information or call CiscoTAC (1-800-553-2447) in order to report a Service-Affecting (SA)
problem.
2.7.143 LOP-V
Default Severity: Major(MJ), Service-Affecting (SA)
SONET Logical Objects: VT-MON, VT-TERM
The LOP VT alarm indicates a loss of pointer at the VT level. This alarm can occur when the received
payload does not match the provisioned payload. LOP-V is caused by a circuit size mismatch on the
concatenation facility.

Clear the LOP-V Alarm

Step1 Complete the “Clear the LOP-P Alarm” procedure on page2-91.
Step2 If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/techsupport
for more information or call CiscoTAC (1-800-553-2447) in order to report a Service-Affecting (SA)
problem.
2.7.144 LO-RXPOWER
Default Severity: Minor(MN), Non-Service-Affecting (NSA)
SONET Logical Object: OCN
The Equipment Low Receive Power alarm is an indicator for OCN port received optical signal power.
LO-RXPOWER occurs when the measured optical power of the received signal falls below the threshold
value, which is user-provisionable.

Clear the LO-RXPOWER Alarm

Step1 At the transmit end of the errored circuit, increase the transmit power level within safe limits.
Step2 Find out whether new channels have been added to the fiber. The number of channels affects power. If
channels have been added, power levels of all channels need to be adjusted.
Step3 Find out whether gain (the amplification power) of any amplifiers has been changed. Changing
amplification also causes channel power to need adjustment.
Step4 If the alarm does not clear, remove any receive fiber attenuators or replace them with lower-resistance
attenuators.