ADTRAN NetVanta 1748F Series, Hardware Installation Manual

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ADTRAN 1748F Switch Troubleshooting
61700558F1-34B Copyright © 2016 ADTRAN, Inc. 41
5. TROUBLESHOOTING
Diagnosing LED Indicators
System Self-Diagnostic Test Failure
If the Diag LED indicates a failure of the system power-on-self-test (POST), you can use a console
connection to view the POST results. The POST results may indicate a failed component or help
troubleshoot the problem. For more information on connecting to the console port and using the CLI, refer
to the
DCSS Administrator’s Guide available online at https://supportforums.adtran.com .
Note a POST failure normally indicates a serious hardware fault that cannot be rectified or worked around.
If you encounter a POST failure, you should contact your dealer for assistance.
Power and Cooling Problems
If a power indicator does not turn on when the power cord is plugged in, you may have a problem with the
power outlet, power cord, or PSU. However, if the switch powers off after running for a while, check for
loose power connections, power losses or surges at the power outlet. If you still cannot isolate the problem,
the PSU may be defective.
Installation
Verify that all system components have been properly installed. If one or more components appear to be
malfunctioning (such as the power cord or network cabling), test them in an alternate environment where
you are sure that all the other components are functioning properly.
Table 15. Troubleshooting Chart
Symptom Action
PSU1 / PSU2 LED is Off • Check connections between the PSU, the power cord and the wall outlet.
• Contact your dealer for assistance.
PSU1 /PSU2 LED is on
Amber
• Power cycle the PSU to try and clear the condition.
• Replace the PSU.
Diag LED is on Amber • Power cycle the switch to try and clear the condition.
• If the condition does not clear, contact your dealer for assistance.
Fan LED is on Amber • Check fans in the fan tray.
• Replace the fan tray as soon as possible.
Link/Act LED is Off • Verify that the switch and attached device are powered on.
• Be sure the cable is plugged into both the switch and corresponding
device.
• Verify that the proper cable type is used and its length does not exceed
specified limits.
• Check the attached device and cable connections for possible defects.
Replace the defective cable if necessary.