Allied Telesis AT-MCF12VF, SM - Manual (Page 32)

Troubleshooting
24
If the F-LNK LED for a fiber optic port is OFF, check the following:
❑
Check to be sure the node connected to the port is powered ON.
❑
Check to be sure that the fiber optic cable is properly connected to the
fiber optic port.
❑
Check to be sure that the node connected to the port is operating at
10 Mbps.
❑
Verify that the maximum allowable loss budget on the fiber optic cable
is within acceptable limits (see Table 4).
If the T-LNK LED for a twisted pair port is OFF, check the following:
❑
Check to be sure the node connected to the port is powered ON.
❑
Check to be sure that the twisted pair cable is securely connected to
both the port on the media converter and the node.
❑
If the twisted pair port is connected to a workstation, check to be sure
that you used a crossover cable. (A crossover cable is not necessary
when connecting a hub or switch to a twisted pair port on the media
converter.)
If a Link LED for a port is lit but there is communication problem with the
port, check the following:
❑
Check to be sure that the node connected to the port is operating at
10 Mbps.
❑
Check to be sure that the duplex setting is set the same on the two
nodes connected to the twisted pair and fiber optic ports of the
channel. For example, if the node connected to a twisted pair port is
set to full-duplex, then the node connected to its corresponding fiber
optic port must also be set to full-duplex.
Resetting the Unit
In some instances you might need to reset the unit. To do so, press the Reset
button on the front of the unit for about 1 second. The LEDs on the unit will
flash once, after which the unit is ready for normal network operations.