Appendix B: Troubleshooting
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Instruction Manual - NXA-ENET8-POE+
Appendix B: 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 CLI Reference Guide.
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 internal power supply.
However, if the switch shuts down after operating for a continuous period, check for loose power connections, power losses or
surges at the power outlet. If you still cannot isolate the problem, the internal power supply 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.
In-Band Access
You can access the management agent in the switch through a connection to any port using Telnet, a web browser, or other
network management software tools. However, you must first configure the switch with a valid IP address, subnet mask, and default
gateway. If you have trouble establishing a link to the management agent, check to see if you have a valid network connection. Then
verify that you entered the correct IP address. Also, be sure the switch port has not been disabled. If it has not been disabled, then
check the network cabling that connects your remote location to the switch.
LED Indicators
LED Status
Action
Power LED is Off
• Check connections between the switch, the power cord, and the AC power outlet.
• Check the AC power outlet is supplying 110-240VAC.
• Contact your dealer for assistance.
DiagLED is blinking amber
• Power cycle the switch to try and clear the condition.
• If the condition does not clear, contact your dealer for assistance.
Diag LED is blinking amber with
PoE Mode button pressed
• Turn off or unplug PoE devices until the condition clears.
• If the condition does not clear, contact your dealer for assistance.
Link LED is Off
• Verify that the switch and attached device are powered on.
• Check the cable connectors are firmly plugged into both the switch and corresponding device.
• If the switch is installed in a rack, check the connections to the punch-down block and patch panel.
• Verify that the proper cable type is used and its length does not exceed specified limits.
• Check the attached adapter and cable connections for possible defects. Replace the defective cable if
necessary.