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Chapter 3
Troubleshooting
Follow the guidelines below to test and troubleshoot the installation in the
event a problem occurs.
Note
Whenever the speed and/or duplex mode are changed during or after
power ON, power OFF then power back ON the switch to load the new
configuration.
If the PWR LED is OFF, do the following:
❑ If the switch is installed on a desktop, check that the power adapter is
securely connected to a power outlet. Also, check that the power
adapter cable is securely connected to the back of the switch.
❑ If the switch is installed in an AT-MCR12 chassis, check that the unit
is fully seated in the slot.
❑ Verify that the power outlet has power by connecting another device
to it.
❑ Try using another power adapter.
If the LNK/ACT LED for the twisted-pair port is OFF, do the following:
❑ Check that the end-node connected to the port is powered ON and is
operating properly.
❑ Check that the twisted-pair cable is securely connected to the twisted-
pair port on the switch and on the end-node.
❑ Check that the end-nodes connected to the switch are operating in the
same duplex mode.