Allied Telesis AT-FS717FC/xx - Manual (Page 30)

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If the LNK/ACT LED for the fiber optic port is OFF, do the following:
q Verify that the end-node connected to the port is ON and is operating
properly.
q Check that the fiber optic cable is securely connected to the port on the
switch and to the port on the end-node.
q Check to be sure that the end-node connected to the port is operating
at 100 Mbps.
q Make sure that the cable connected to the fiber optic receiver port on
the switch is connected to the transmitter port on the end-node and
that the fiber optic transmitter port on the switch is connected to the
receiver port on the end-node.
q Test the attenuation on the fiber cable to ensure that it does not
exceed acceptable values.
q Verify that you are using the appropriate type of fiber optic cabling
and that you have not exceeded the maximum operating distance. For
cable types and operating distance, refer to Table 1 and Table 2 on
page 3.
q Make sure that the 100FX DUPLEX switch is set correctly. The switch
should be set to match the duplex mode of the end-node connected to
the fiber optic port.
q 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 switch. See “Fiber Optic Port Specifications” on page 22 for
additional information on the fiber optic port.
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.