Allied Telesis AT-10408XP - Manual (Page 45)

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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 need further assistance, please contact Allied Telesis
Technical Support. Refer to “Contacting Allied Telesis” on page 14.
Check the Status LEDs on the front of the switch. If the PSU1 or the PSU2
LED is red and the FAULT LED is red, then there may be a problem with
the unit 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 Try connecting the unit to another power source.
ˆ Try using a different power cord.
ˆ Verify that the voltage from the power source is within the required
levels for your region.
Verify that the LINK/ACT LED for the in-band management port is ON. If a
LINK/ACT LED is OFF, do the following:
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.