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Chapter 3
Troubleshooting
Diagnosing Hub
LEDs
The hub can be easily monitored through panel LEDs to assist the network
manager in identifying problems. This section describes common problems you
may encounter and possible solutions.
Symptom.
10/100M Link LED does not light up after making a connection.
Cause.
Network interface, for example a network adapter card on the attached
device, network cable, or hub port is defective.
Solution.
Verify that the hub and attached device are powered on. Be sure the
cable is plugged into both the hub and corresponding device. Verify that the proper
cable type is used and its length does not exceed specified limits (100 meters/328
feet when connecting to a workstation or switch, and 5 meters/16 feet when
connecting to another hub). Check the network adapter on the attached device and
cable connections for possible defects. Replace the defective adapter or cable if
necessary.
Symptom.
Power LED is not green after power-ON.
Cause.
Defective power outlet, power cord, or internal power supply.
Solution.
Check the power outlet by plugging in another device that is functioning
properly. Check the power cord with another device. If these measures fail to
resolve the problem, have the unit's power supply replaced by a qualified Allied
Telesyn distributor.
Power and Cooling
Problems
If the Power LED is not lite when the power is applied, you may have a problem
with the power outlet, power cord, or internal power supply as explained in the
previous section. 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 fan on back of the unit is unobstructed and running prior to shutdown. If
you still cannot isolate the problem, then the internal power supply may be
defective. In this case, contact your Allied Telesyn distributor for assistance.
Installation
Verification
Verify that all system components have been properly installed. If one or more
components appear to be malfunctioning, for example the power cord or network
cabling, test them in an alternate environment where you are sure that all the
other components are functioning properly.