Chapter 3: Troubleshooting - Allied Telesis FS750 SERIES Installation Manual

Chapter 3
Troubleshooting
This chapter contains information on how to troubleshoot the switch if a
problem occurs.
Note
For further assistance, please contact Allied Telesis Technical
Support at alliedtelesis.com/support.
Problem 1: The POWER LED on the front of the switch is off.
Solutions: The unit is not receiving power. Try the following:
Verify that the power cord is securely connected to the power

source and to the AC connector 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 a different power cord.

Verify that the voltage from the power source is within the required

levels for your region.
Problem 2: A twisted-pair port on the switch is connected to a network
device, but the port's Link Activity LED is off.
Solutions: The port is unable to establish a link to a network device. Try
the following:
Verify that the network device connected to the twisted-pair port is

powered on and is operating properly.
Verify that the twisted-pair cable is securely connected to the port

on the switch channel and to the port on the remote network
device.
Verify that the port is connected to the correct twisted-pair cable.

This is to eliminate the possibility that the port is connected to the
wrong network device, such as a powered-off device.
Try connecting another network device to the twisted-pair port with

a different cable. If the twisted-pair port is able to establish a link,
then the problem is with the cable or the other network device.
Verify that the twisted-pair cable does not exceed 100 meters (328

feet).
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