Allied Telesis AT-FS201 Installation Manual page 28

Troubleshooting
If the LNK/ACT LED for the fiber optic port is OFF, do the following:
Verify that the end-node connected to the port is ON and is operating
properly.
Check that the fiber optic cable is securely connected to the fiber optic
port on the switch and on the end-node.
Check to be sure that the end-node connected to the port is operating
at 100 Mbps.
Check to be sure that the end-nodes connected to the switch are
operating at the same duplex mode.
Make sure that the cable connected to the switch's receiver port (RX)
is connected to the end-node's transmitter port (TX) and that the
switch's transmitter port (TX) is connected to the end-node's receiver
port (RX).
Test the attenuation on the fiber cable to ensure that it does not
exceed acceptable values.
Verify that you are using the appropriate type of fiber optic cables and
that you have not exceeded the maximum operating distances. For the
maximum operating distances, refer to Table 1 on page 3 and for the
cable types, refer to Table 4 on page 13.
Check that the operating specifications of the fiber optic port on the
end-node are compatible with the operating specifications of the fiber
optic port on the switch. For the fiber optic port specifications, refer to
"Fiber Optic Port Specifications" on page 20.
If you are still experiencing problems after testing and troubleshooting the
installation, contact Allied Telesyn Technical Support for assistance. Refer to
"Contacting Allied Telesyn Technical Support" on page viii or visit our web
site at www.alliedtelesyn.com for support information.
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