Cisco ONS 15327 User Documentation page 474

Alarm Procedures
A payload defect indication path (PDI-P) alarm indicates a signal label mismatch failure (SLMF). An
invalid C2 byte in the SONET path overhead causes an SLMF. The C2 byte is the signal label byte. This
byte tells the equipment what the SONET payload envelope contains and how it is constructed. It enables
a SONET device to transport multiple types of services.
The ONS 15327 encounters an SLMF when the payload, such as an ATM, does not match what the signal
label is reporting. An AIS alarm often accompanies the PDI-P alarm. If the PDI-P is the only alarm
reported with the AIS, clear the PDI-P alarm to clear the AIS alarm. PDI-P can also occur during an
upgrade, but usually clears itself and is not a valid alarm.
Warning Invisible laser radiation may be emitted from the aperture ports of the single-mode, fiber-optic
modules when no cable is connected. Avoid exposure and do not stare into open apertures.
Always use the supplied ESD wristband when working with a powered ONS 15327. Plug the wristband
Caution
cable into the ESD jack located on the lower-right outside edge of the shelf assembly.
Procedure: Clear the PDI-P Condition
Verify that all circuits terminating in the reporting card are in an active state:
Step 1
a.
b.
c.
After determining that the port is active, verify the signal source to the card reporting the alarm.
Step 2
Step 3 If traffic is affected, delete and recreate the circuit.
Caution
Check the far-end OC-N card that provides STS payload to the reporting card.
Step 4
Step 5 Confirm the cross-connect between the OC-N card and the reporting card.
Clean the far-end optical fiber:
Step 6
a.
b.
Replace the optical/electrical cards.
Step 7
Note
Cisco ONS 15327 User Documentation, R3.3
14-66
Click the Circuits tab.
Verify that the State column lists the port as ACTIVE.
If the State column lists the port as INCOMPLETE, wait 10 minutes for the ONS 15327 to fully
initialize. If INCOMPLETE does not change after full initialization, login to
http://www.cisco.com/TAC for more information or call the Cisco Technical Assistance Center to
report a service-affecting problem (1-800-553-2447).
Deleting a circuit may affect traffic.
Clean the fiber according to local site practice.
If no local practice exists, use a CLETOP Real-Type or equivalent fiber-optic cleaner and follow the
instructions accompanying the product.
When you replace a card with an identical type of card, you do not need to make any changes to
the database.
Chapter 14 Alarm Troubleshooting
June 2002