Allied Telesis AT-FS238a/2 - Manual (Page 38)

Troubleshooting
26
❑
Make sure that the twisted pair cable does not exceed 100 meters (328
feet) and that you are using a Category 3 or better cable for 10Base-T
operation or a Category 5 or better cable for 100Base-TX operation.
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 bridging converter 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 bridging
converter are operating at the same duplex mode.
❑
Make sure that the cable connected to the bridging converter’s
receiver port (RX) is connected to the end-node’s transmitter port (TX)
and that the bridging converter’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 4 and for the
cable types, refer to Table 4 on page 15.
❑
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 bridging converter. For the fiber optic port
specifications, refer to “Fiber Optic Port Specifications” on page 29.
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 x or visit our web site
at www.alliedtelesyn.com for support information.