Allied Telesis AT-MC103ST/FS3, FS4 - Manual (Page 24)

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2. Turn ON the nodes (such as the hubs or switches) that are connected to
the media converter.
3. Set the Link Test/MissingLink button on the media converter to the LNK
TST (IN) position.
4. Check the two LNK LEDs. They should be green, indicating that the
media converter is receiving a signal from the nodes connected to the
ports. If the LNK LED is not green, check the following:
— The node connected to the port is powered ON.
— The fiber optic cable is securely connected to the fiber optic port.
— The appropriate type of fiber optic cable for the port is being used.
Refer to Table 3 through Table 5 for cable specifications.
— The maximum allowable loss budget for the fiber optic cable has not
been exceeded.
5. If the two LNK LEDs are green but there is a communication problem
between the nodes connected to the media converter (and you are not
running a link test), check the following:
— The nodes connected to the ports are operating at 100 Mbps.
— The nodes connected to the media converter are operating in the same
duplex mode. The media converter is transparent to the duplex mode.
(Check to be sure that the auto-negotiation button is set correctly.
Refer to “Auto-negotiation Button” on page 5.)
— The Link Test/MissingLink button on the media converter is in the
M/L ON (IN) position.
— Check that the maximum allowable loss budget for the fiber optic
cable has not been exceeded.
6. Set the Link Test/MissingLink button on the media converter to M/L ON
(IN) position. The M/L ON position activates the MissingLink feature on
the media converter.
Note
When operating two media converters in a back-to-back configuration, it
is recommended that the MissingLink feature on one or both of the
converters be disabled. The MissingLink feature can be disabled by
placing the LNK TST to the OUT position. Disabling the MissingLink
feature does not interfere with the converter’s ability to pass network
traffic.