Troubleshooting - Allied Telesis AT-GS900/5E Guia De Instalacion

Chapter 3

Troubleshooting

This chapter contains information on how to troubleshoot the switch in the
event a problem occurs.
Note
If you are still unable to resolve the problem after following the
instructions in this chapter, contact Allied Telesis Technical Support
for assistance. Refer to "Contacting Allied Telesis" on page 10.
Check the POWER LED on the front of the switch. If the LED is OFF,
indicating that the unit is not receiving power, do the following:
Verify that the external power supply is securely connected to the
power source and to the DC power jack on the back panel of the
switch.
Verify that the power outlet has power by connecting another device to
it.
Try connecting the unit to another power source.
Try using a different power cord.
Verify that the voltage from the power source is within the required
levels for your region.
Verify that the L/A LED for each port is ON. If a L/A LED is OFF, do the
following:
Verify that the end-node connected to the port is powered ON and is
operating properly.
Verify that the twisted pair cable is securely connected to the port on
the switch and to the port on the end-node.
Ensure that the twisted pair cable does not exceed 100 meters (328
feet).
Verify that you are using the appropriate category of twisted pair cable:
Category 3 or better for 10 Mbps operation and Category 5 and
Category 5E for 100 Mbps operation.
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