Allied Telesis AT-8000GS/POE User Manual

47

This chapter contains information on how to troubleshoot the switch in the 
event that a problem occurs.

If you are still unable to resolve the problem after following the 
instructions in this chapter, contact ATI Technical Support for 
assistance.

Check the PWR LED on the front of the switch. If the LED is OFF, indicating that the unit is 
not receiving power, do the following:

ˆ

Ensure that the power cord is securely connected to the power source 
and to the AC connector on the back panel of the switch.

ˆ

Verify that the power outlet has power by connecting another device to 
it.

ˆ

Try connecting the unit to another power source.

ˆ

Try using a different power cord.

ˆ

Verify that the voltage from the power source is within the required 
levels for your region.

ˆ

Verify that the LNK/ACT LED for each port is ON. If a LNK/ACT LED is 
OFF, do the following:

ˆ

Verify that the end-node connected to the port is powered ON and is 
operating properly.

ˆ

Verify that the twisted pair cable is securely connected to the port on 
the switch and to the port on the end-node.

ˆ

Ensure that the twisted pair cable does not exceed 100 meters (328 
feet).

ˆ

Verify that you are using Category 5 twisted pair cable.

ˆ

Be sure the switch is powered up.

ˆ

Check network cabling between the management station and the 
switch.

ˆ

Check that you have a valid network connection to the switch and that 
the port you are using has not been disabled.

ˆ

Be sure you have configured the VLAN interface through which the 
management station is connected with a valid IP address, subnet mask 
and default gateway.