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Model FS102, Model FS104, Model FS108 Fast Ethernt Switch Installation Guide
Symptom Cause Solution
Green Link LED is
off on an active
port.
Port connection is
not functioning.
Make sure the attached device is powered and there is
a proper UTP connection at that end.
Make sure the network adapter card installed in the
PC is in working condition. Verify that the network
adapter card is100 Mbps capable and that the 100
Mbps LED and Link LEDs are on at the network
adapter card in the PC.
Make sure the proper cable is installed, and check for
miswired cable pairs or loose connectors.
Green Link LED is
intermittent on an
active port.
Port connection is
not functioning.
Make sure the port termination at both the switch and
the device end is correct. Check the crimp on the RJ-
45 connectors. In a Fast Ethernet operation, the
quality of the crimp on the connector is important. It is
also important that only Category 5 cable is used and
that it is certified for 100 Mbps operation.
Make sure the length of the UTP cable from the switch
to the device does not exceed 328 feet (100 meters).
Using cable test equipment, make sure the cable
meets the crosstalk, attenuation, and impedance
specifications as required by the 100BASE-TX
standard. Refer to “Cable and Connector Information”
for information about cable specifications.
Green Link LED is
off on ports 1 or 2
on the Model
FS102 switch, port
4 on the Model
FS104 switch, or
port 8 on the
Model FS108
switch.
Port connection is
not functioning.
Check the Normal/Uplink push button on the front
panel.
If you are using a straight-through cable connected to
a PC or other MDI-wired device, make sure the
Normal/Uplink push button is set in the Normal
position.
If you are using a straight-through cable connected to
a router or another switch, make sure the Normal/
Uplink push button is set in the Uplink position.
Try the alternate position of the Normal/Uplink push
button to turn the Link LED on.
Refer to “Cable and Connector Information” for cable
information.
Green 100 Mbps
LED is off when
operating in a Fast
Ethernet network.
Port is operating in
10 Mbps mode.
Make sure the adapter card is capable of 100 Mbps
operation and set for 100 Mbps operation if it is not
autosensing.
Green Link LED is
on and Green FDX
LED is off when
connected to a full
duplex network.
Port is operating in
half-duplex mode.
Make sure the duplex switch on the Model FS102/
FS104/FS108 switch is set for full-duplex operation.
Make sure the connected device is capable of full-
duplex transmission.
Troubleshooting Information