Allied Telesis AT-GS900/24 - Manual (Page 41)

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Chapter 3
Troubleshooting
This chapter contains information on how to troubleshoot the switch in the
event that a problem occurs.
Note
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 14.
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 L/A LEDs are green or blinking green for each port is ON. If
a L/A 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.
ˆ Verify that the eco friendly switch is in the “Out” position.
Note
A 1000Base connection can take from five to ten seconds for the link
to be established.