Allied Telesis AT-MC104LH - Manual (Page 38)

Chapter 3: Troubleshooting
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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 end-node.
ˆ Verify that the end-nodes connected to the media converter are
operating at the same speed. Both must be operating at 100 Mbps.
ˆ Make sure that the cable connected to the media converter’s receiver
port (RX) is connected to the end-node’s transmitter port (TX) and
that the media converter’s transmitter port (TX) is connected to the
end-node’s receiver port (RX).
ˆ Test the attenuation on the fiber optic cable to ensure that it does not
exceed acceptable values. Refer to “Fiber Optic Port Specifications”
on page 34 for more information.
ˆ Verify that you are using the appropriate type of fiber optic cable and
that you have not exceeded the maximum operating distance. For
maximum operating distances, refer to Table 1, “Maximum Operating
Distances (AT-MC101XL, AT-MC102XL, AT-MC103XL, and AT-
MC103LH),” on page 4. For cable types, refer to “Fiber Optic Port
Specifications” on page 34.
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 “Fiber Optic Port Specifications” on
page 34 for more information.
If there is a communication problem between the end-nodes connected to
the media converter, do the following:
ˆ Verify that both end-nodes are operating with the same duplex mode.
If you are still experiencing problems after testing and troubleshooting the
installation, refer to “Contacting Allied Telesyn” on page x or visit our web
site at www.alliedtelesyn.com for support information.