Allied Telesis GS900/5E User Manual

37

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. 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:

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

Connect the unit to another power source.

ˆ

Use a different power cord.

ˆ

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

Verify that the SPD/LINK/ACT LED for each port is ON. If a SPD/LINK/
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 the appropriate category of twisted pair cable: 
Category 3 or better for 10 Mbps operation and Category 5 and 
Category 5E for 100 and 1000 Mbps operation.

A 1000Base connection can take from five to ten seconds for the link 
to be established.