Cisco ONS 15454 SDH Specifications Page 59

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Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide, R3.3
May 2002
Chapter 1 Alarm Troubleshooting
Alarm Procedures
Note This is an informational alarm.
1.5.38 HITEMP
Critical, Service-affecting (NE)
Minor, Non-service affecting (EQPT)
The equipment failure high temperature alarm means the temperature of the ONS 15454 SDH is above
50 degrees Celsius (122 degrees Fahrenheit).
Caution Always use the supplied electrostatic discharge wristband when working with a powered
ONS 15454 SDH. Plug the wristband cable into the ESD jack located on the middle-right outside edge
of the shelf assembly.
Procedure: Clear the HITEMP Alarm
Step 1 Check the temperature of the ONS 15454 SDH 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 SDH.
Step 4 Ensure that blank faceplates fill the ONS 15454 SDH 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 SDH.
Step 7 Reinsert the fan tray, making sure the back of the fan tray connects to the rear of the ONS 15454 SDH.
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, login to http://www.cisco.com/tac for more
information or If the alarm does not clear, 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.
1.5.39 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 from the configuration on the
ONS 15454 SDH. It also usually occurs during the selection of a new node reference clock. The alarm
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