Download Cisco 15310-MA Troubleshooting guide

Chapter 2
Alarm Troubleshooting
Alarm Procedures
Step 2
If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/techsupport
for more information or call Cisco TAC (1-800-553-2447).
2.7.144 LO-LASERTEMP
The Equipment Low Laser Optical Transceiver Temperature alarm applies to the TXP and MXP cards.
For more information about this alarm, refer to the “Alarm Troubleshooting” chapter of the
Cisco ONS 15454 DWDM Troubleshooting Guide.
2.7.145 LOM
Default Severity: Critical (CR), Service-Affecting (SA) for STSMON and STSTRM; Major (MJ)
for VT-TERM
SONET Logical Objects: STSMON, STSTRM, VT-TERM
The Optical Transport Unit (OTU) Loss of Multiframe is a VCAT member alarm. (VCAT member
circuits are independent circuits that are concatenated from different time slots into a higher-rate signal.)
The alarm applies to OCN ports when the Multi Frame Alignment Signal (MFAS) overhead field is
errored for more than five frames and persists for more than 3 milliseconds.
Note
Optical cards do not recognize the LOM. The system redirects the LOM alarm to the incoming side so
that any optical card can display this alarm as a TERM alarm.
Clear the LOM Alarm
To clear the alarm, 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 (SA) problem.
2.7.146 LOP-P
Default Severity: Critical (CR), Service-Affecting (SA)
SONET Logical Objects: STSMON, STSTRM
A Loss of Pointer Path alarm indicates that the SONET path pointer in the overhead has been lost. LOP
occurs when valid H1/H2 pointer bytes are missing from the overhead. Receiving equipment monitors
the H1/H2 pointer bytes to locate the SONET payload. An LOP-P alarm occurs when eight, nine, or ten
consecutive frames do not have valid pointer values. The alarm clears when three consecutive valid
pointers are received.
The LOP-P alarm can occur when the received payload does not match the provisioned payload. The
alarm is caused by a circuit type mismatch on the concatenation facility. For example, if an STS-1 is sent
across a circuit provisioned for STS-3c, an LOP-P alarm occurs.
Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, Release 9.0
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