Allied Telesis AT-GS924M - Manual (Page 49)

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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 www.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).