Allied Telesis AT-GS920/16, Installation And User Manual

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Chapter 5
Troubleshooting
This chapter contains information on how to troubleshoot the switch in the
event a problem occurs.
Note
If you are still unable to resolve the problem after following the
instructions in this chapter, contact Allied Telesis Technical Support
for assistance. Refer to “Contacting Allied Telesis” on page 11.
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:

Verify that the power cord is securely connected to the power source
and to the connector on the back panel of the switch.

Verify that the power outlet or power supply has power by connecting
another device to it.

Try connecting the unit to another power source.

Try using a different power cord.

Verify that the voltage from the power source is within the required
levels for your region.
Verify that the L/A LED for each port is green. If an L/A LED is OFF, do the
following:

Verify that the end-node connected to the port is powered ON and is
operating properly.

Verify that the twisted pair cable is securely connected to the port on
the switch and to the port on the end-node.

Ensure that the twisted pair cable does not exceed 100 meters (328
feet).

Verify that you are using the appropriate category of twisted pair cable:
Category 3 or better for 10 Mbps operation, Category 5 for 100 Mbps
operation, and four-pair Category 5e for 1000 Mbps.