Cisco ONS 15454 Troubleshooting Manual page 349

Chapter 2 Alarm Troubleshooting
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 in order to report a Service-Affecting (SA)
problem.
2.7.213 LOP-P
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.
For the FC_MR-4 card, an LOP-P is raised if a port is configured for a SONET signal but receives an
SONET signal instead. (This information is contained in the H1 byte bits 5 and 6.)
Clear the LOP-P Alarm
Caution Always use the supplied electrostatic discharge wristband when working with a powered ONS 15454.
Plug the wristband cable into the ESD jack located on the lower-right edge of the shelf assembly.
In node view, click the Circuits tab and view the alarmed circuit.
Step 1
Verify the circuit size listed in the Size column. If the size is different from what is expected, such as an
Step 2
STS3c instead of an STS1, this causes the alarm.
If you have been monitoring the circuit with optical test equipment, a mismatch between the provisioned
Step 3
circuit size and the size expected by the test set can cause this alarm. For specific procedures to use the
test set equipment, consult the manufacturer. Ensure that the test set monitoring is set up for the same
size as the circuit provisioning.
Refer to the manufacturer's instructions for test-set use.
If the error is not due to an incorrectly configured test set, the error is in the provisioned CTC circuit
Step 4
size. Complete the
Recreate the circuit for the correct size. For procedures, refer to the "Create Circuits and VT Tunnels"
Step 5
chapter in the Cisco ONS 15454 Procedure Guide.
If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/techsupport
Step 6
for more information or call Cisco TAC 1 800 553-2447 in order to report a Service-Affecting (SA)
problem.
November 2009
Default Severity: Critical (CR), Service-Affecting (SA)
SONET Logical Objects: STSMON, STSTRM
"Delete a Circuit" procedure on page 2-275.
Cisco ONS 15454 Troubleshooting Guide, R8.5
2.7.213 LOP-P
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