Allied Telesis AT-MC13 - Manual (Page 34)

Chapter 3: Troubleshooting
34
If the LINK LED for the fiber optic port is OFF, do the following:
ˆ Verify that the end-node connected to the port is ON and is operating
properly.
ˆ Check that the fiber optic cable is securely connected to the fiber
optic port on the media converter and on the remote end-node.
ˆ Check to be sure that the end-node connected to the port is operating
at 10 Mbps.
ˆ Make sure that the fiber optic port on the remote end-node is
operating in either full- or half-duplex mode.
ˆ Make sure that the cable connected to the fiber optic receiver port on
the media converter is connected to the transmitter port on the
remote end-node and that the fiber optic transmitter port on the media
converter is connected to the receiver port on the end-node.
ˆ Test the attenuation on the fiber cable to ensure that it does not
exceed acceptable values.
ˆ Verify that you are using the appropriate type of fiber optic cable and
that you have not exceeded the maximum operating distance. For
cable types and operating distances, refer to Table 2 on page 38.
ˆ Check that the operating specifications (e.g., wavelength and
maximum operating distance) of the fiber optic port on the end-node
are compatible with the operating specifications of the fiber optic port
on the media converter. Refer to Table 4 on page 39 for fiber optic
port specifications.
If the LINK LED for the fiber optic port is ON, but there is a communication
problem between the end-nodes connected to the media converter (and
you are not running a Fiber Link Test), check the following:
ˆ Check that the end-nodes connected to the ports are operating at 10
Mbps.
ˆ Check that the end-nodes connected to the AT-MC13 are operating in
the same duplex mode. These units can operate in either full- or half-
duplex mode.
ˆ Check that the NORMAL/LNK TST button on the media converter is
in the IN position.
ˆ Check that the maximum allowable loss budget for the fiber optic
cable has not been exceeded. Refer to Table 4 on page 39 for the
fiber optic port specifications.