Specifications

1-43

Cisco ONS 15454 Troubleshooting and Maintenance Guide

November 2001

Chapter 1 Alarm Troubleshooting

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 outside edge of the shelf

assembly.

Procedure: Clear the HITEMP Alarm

Step 1 Check the temperature of the ONS 15454 on the front panel LCD.

Step 2 Check that the temperature of the room is not abnormally high.

Step 3 Ensure that nothing prevents the fan-tray assembly from passing air through the ONS 15454.

Step 4 Ensure that blank faceplates fill the ONS 15454 empty slots. Blank faceplates help airflow.

Step 5 Check the condition of the air filter to see if it needs replacement.

Step 6 If the filter is clean, take the fan-tray assembly out of the ONS 15454.

Step 7 Reinsert the fan tray, making sure the back of the fan tray connects to the rear of the ONS 15454.

Note The fan should run immediately when correctly inserted.

Step 8 If the fan does not run or the alarm persists, replace the fan tray.

Step 9 If the replacement fan tray does not operate correctly, log on to http://www.cisco.com/tac for more

information or call the Cisco Technical Assistance Center to report a service-affecting problem

(1-877-323-7368).

1.3.62 HLDOVERSYNC

• Major, Service affecting

Loss of the primary/secondary timing reference raises the Holdover Synchronization alarm. Timing

reference loss occurs when line coding on the timing input is different than the configuration on the ONS

15454. It also usually occurs during the selection of a new node reference clock. This alarm indicates

that the ONS 15454 has gone into holdover and is using the ONS 15454 internal reference clock, which

is a Stratum 3-level timing device. The alarm clears when primary or secondary timing is reestablished.

Procedure: Clear the HLDOVERSYNC Alarm

Step 1 Check for additional alarms that relate to timing.

Step 2 Reestablish a primary and secondary timing source according to local site practice.