Allied Telesis AT-FS238b/2 - Manual (Page 43)

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Chapter 3
Troubleshooting
Follow the guidelines below to test and troubleshoot the installation in the
event a problem occurs.
Note
If you change the speed or duplex mode of a port on the bridging
converter using the DIP switches, you must power OFF and then power
ON the unit to activate the change.
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.
❑
Make sure that the twisted pair cable does not exceed 100 meters (328
feet) and that you are using a Category 3 or better cable for 10Base-T
operation or a Category 5 or better cable for 100Base-TX operation.