Cisco ONS 15454 SDH Specifications download pdf (Page 39)

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Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide, R3.3

May 2002

Chapter 1 Alarm Troubleshooting

Alarm Procedures

1.5.11 AUTOSW-UNEQ-SNCP

• Minor, Service-affecting

An automatic SNCP switch caused by UNEQ alarm indicates that automatic SNCP protection switching

took place because of an UNEQ alarm. The SNCP is configured for revertive switching and will switch

back to the working path after the fault clears.

Warning

The ONS 15454 SDH is a Class I (CDRH) and Class 1M (IEC) laser system.

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.

Procedure: Clear the AUTOSW-UNEQ Alarm

Step 1 Display the CTC network view and right-click the span reporting AUTOSW-UNEQ.

Step 2 Select Circuits from the menu.

Step 3 If the specified circuit is a low-order path tunnel, check for low-order paths assigned to the tunnel.

Step 4 If the low-order path tunnel does not have assigned low-order paths, delete the low-order path tunnel

from the list of circuits.

Step 5 If you have complete visibility to all nodes, check for incomplete circuits such as stranded bandwidth

from circuits that were not deleted completely.

Step 6 If you find incomplete circuits, verify whether they are working circuits and if they are still passing

traffic.

Step 7 If the incomplete circuits are not needed or are not passing traffic, delete them and log out of CTC. Log

back in and check for incomplete circuits again. Recreate any needed circuits.

Step 8 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, and the INCOMPLETE does not change after

a full initialization, login to http://www.cisco.com/tac for more information or login to

http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml to obtain a directory of Cisco

Technical Assistance Center toll-free numbers for your country.

Step 9 After you determine that the port is active, verify the signal source received by the card reporting the

alarm.

Step 10 Check the far-end STM-N card that provides payload to the card.

Step 11 Verify the far-end cross-connect between the STM-N card and the E-N card.

Step 12 Clean the far-end optical fiber cable ends:

a. Clean the fiber cable ends according to local site practice.

b. If no local practice exists, use a CLETOP Real-Type or equivalent fiber-optic cleaner and follow

the instructions accompanying the product.

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Cisco ONS 15454 SDH Specifications Page 39