Allied Telesis AT-FS238a/2 - Manual (Page 37)

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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 bridging converter to
load the new configuration.
If the PWR LED is OFF, do the following:
❑
If the bridging converter is installed on a desktop, check to be sure
that the power adapter is securely connected to a power outlet and
that the power adapter cable is securely connected to the back of the
bridging converter.
❑
If the bridging converter is installed in an AT-MCR12 chassis, check
that the unit is fully seated in the slot and the retaining screw is
securely fastened.
❑
Verify that the power outlet has power by connecting another device
to it.
❑
Try using another power adapter.
If the LNK 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 bridging converter and on the end-node.
❑
Check to be sure that the end-nodes connected to the bridging
converter are operating at the same duplex mode.