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Cisco ONS 15327 Troubleshooting Guide, R3.4
March 2004
Chapter 2 Alarm Troubleshooting
Alarm Procedures
• If you are looking at the node view of the ONS 15327, an amber LED depiction with “Sby” has
replaced the white “LDG” depiction on the card in CTC.
Step 5 If the alarm does not clear, log onto http://www.cisco.com/tac for more information or call TAC
(1-800-553-2447).
2.6.133 PLM-P
• Critical (CR), Service Affecting (SA)
A Payload Label Mismatch Path (PLM-P) alarm indicates that signal does not match its label. The
condition occurs due to an invalid C2 byte value in the SONET path overhead.
For example, this alarm can occur when a card is expecting a 0 value in the C2 byte, but receives a 4
instead. This can occur on the XTC card when the card expects a DS-1 signal but receives a DS-3 signal.
The DS-3 signal C2 byte value is 4, so this will cause a label mismatch and a PLM-P alarm.
Warning
Invisible laser radiation might be emitted from the end of the unterminated fiber cable or connector.
Do not stare into the beam directly with optical instruments. Viewing the laser output with certain
optical instruments (for example, eye loupes, magnifiers, and microscopes) within a distance of 100
mm might pose an eye hazard. Use of controls or adjustments or performance of procedures other than
those specified might result in hazardous radiation exposure.
Caution Always use the supplied electrostatic discharge wristband when working with a powered ONS 15327.
Plug the wristband cable into the ESD jack located between the top high-speed and XTC slots.
Procedure: Clear the PLM-P Alarm
Step 1 Verify that all circuits terminating in the reporting card are active:
a. Click the Circuits tab.
b. Verify that the State column lists the port as active.
c. If the State column lists the port as incomplete, wait up to ten minutes for the ONS 15327 to
initialize fully. If the incomplete state does not change after full initialization, log onto
http://www.cisco.com/tac for more information or call TAC to report a service-affecting problem
(1-800-553-2447).
Step 2 After determining the port is active, verify the signal source to the traffic card reporting the alarm with
an optical test set according to site specific practice.
For specific procedures to use the test set equipment, consult the manufacturer.
Step 3 If traffic is being affected, complete the “Delete a Circuit” procedure on page 2-128.
Caution Deleting a circuit might affect traffic.
Step 4 Recreate the circuit with the correct circuit size. Refer to the Cisco ONS 15327 Procedure Guide for
detailed procedures to create circuits.