Lop-P - Cisco NCS 2000 series Troubleshooting Manual

LOP-P

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LOP-P
Default Severity: Critical (CR), Service-Affecting (SA)
Logical Object: 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.
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 NCS. Plug the
wristband cable into the ESD jack located on the lower-right edge of the shelf assembly.
SUMMARY STEPS
1. In node view, click the Circuits tab and view the alarmed circuit.
2. Verify the circuit size listed in the Size column. If the size is different from what is expected, such as an
STS3c instead of an STS1, this causes the alarm.
3. If you have been monitoring the circuit with optical test equipment, a mismatch between the provisioned
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.
4. If the error is not due to an incorrectly configured test set, the error is in the provisioned CTC circuit size.
Complete the
5. Recreate the circuit for the correct size. For procedures, refer to the Create Circuits and VT Tunnels
chapter in the Configuration guide.
DETAILED STEPS
Step 1 In node view, click the Circuits tab and view the alarmed circuit.
Step 2
Verify the circuit size listed in the Size column. If the size is different from what is expected, such as an STS3c instead
of an STS1, this causes the alarm.
Cisco NCS 2000 series Troubleshooting Guide, Release 11.0
270
to obtain a directory of toll-free Technical Support numbers for
Delete a Circuit, on page 454 procedure.
Alarm Troubleshooting