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Troubleshooting
20
❑ 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.
For information about maximum operating distances, see
Table 1 on
page 3.
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 that the end-node connected to the port is operating at 100
Mbps.
❑ Check 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 3 on page 12, Table 4 on page 12, or Table 5
on page 14.
❑ 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
refer to Table 1 on page 3 and for the cable types, refer to Table 3 on
page 12, Table 4 on page 12, or Table 5 on page 14.
If you are still experiencing problems after testing and troubleshooting the
installation, contact Allied Telesyn Technical Support for assistance. Refer to
“Contacting Allied Telesyn” on page viii.