Troubleshooting
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NXA-ENET24 Hardware Installation Guide
Troubleshooting
Diagnosing Switch Indicators
Power and Cooling Problems
If the 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 unit powers off after running for a while,
check for loose power connections, power losses or surges at the power outlet, and verify that the fans on the
unit are unobstructed and running prior to shutdown.
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 from anywhere within the attached network 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 port through which you are connecting to the switch has not been disabled. If it has not been
disabled, then check the network cabling that runs between your remote location and the switch.
Troubleshooting Chart
Symptom
Action
PWR LED is Off
• Internal power supply may be disconnected. Check connections between the
switch, the power cord and the wall outlet.
Diag LED is Amber
• The system has detected a fault. Power cycle the switch to try and clear the
condition.
• If the condition does not clear, contact your dealer for assistance.
Diag LED is Flashing
Amber
• Check that all stacking cables are properly connected.
Stack LED is Flashing
Green or Amber
• The stack has not completed its initial configuration. Wait a few minutes for
the process to complete.
• If flashing continues, check that the Master Select button is pressed in on
only one switch.
• Check that all stacking cables are properly connected.
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.
• 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 adapter on the attached device and cable connections for possible
defects. Replace the defective adapter or cable if necessary.
The management agent accepts up to four simultaneous Telnet sessions. If the
maximum number of sessions already exists, an additional Telnet connection will not
be able to log into the system.