Allied Telesis AT-220-28GS Series, Installation Manual

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AT-x220-28GS Switch Installation Guide
45
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: All of the port LEDs are off even though the ports are
connected to active network devices.
Solution: The switch is probably operating in low power mode. To toggle
on the LEDs, press the ecofriendly button on the front panel for 1 to 4
seconds.
Problem 3: The Link/Activity/Speed LED for an SFP transceiver is off.
Solutions: The fiber optic port on the transceiver is unable to establish a
link to a network device. Try the following:

Verify that the remote network device connected to the fiber optic
port is operating properly.

Verify that the fiber optic cable is securely connected to the port on
the media converter channel and to the port on the remote network
device.

Check that the SFP module is fully inserted in the slot.

Verify that the operating specifications of the fiber optic ports on
the SFP transceiver and the remote network device are
compatible.