AT-1720
32
Experiment with Possible Solutions
The first rule of troubleshooting is to isolate the problem. As you
experiment, vary only one factor at a time. Substitute known
good equipment and see if the problem persists or is eliminated.
❑
Do not overlook the obvious—make sure the card is seated in
the computer and that the cables and connectors are securely
attached.
❑
If the link LED does not light with UTP or fiber optic media,
make sure the cabling is intact and connected to a functioning
network port. Swap fiber optic connectors between receptacles
to verify TX-RX connection.
❑
If the link LED lights on a 10BASE-T segment, but data
transfer is slow, collision-prone, or non-existent, verify that
your cable is of Level 3, 4, 5 or IBM type 1 (see Important
10BASE-T Cable Considerations on page 21 ). Level 1 and 2
voice-quality cable will not work properly.
If the cable is more or less round in section, you probably have
data grade cable, correctly paired, and no transmission
problems. If, however, the cable appears flat in section (as
“Silver Satin” telephone-type cable) you probably have voice-
grade cable and transmission problems. If it looks like
telephone cable, double-check it.
❑
If the computer is on a 10BASE-T segment, make sure the
“Shielded or Unshielded Twisted Pair Select” setting in the
computer manufacturer’s configuration menu matches the
impedance of the wire (100
Ω
or 150
Ω
).
❑
If the computer is on a 10BASE2 segment, make sure the cable
is connected with T-connectors, terminated at the ends with
50
Ω
terminators, and grounded in only one place.
❑
If you suspect the network adapter card is not working
properly, disconnect the computer from the network and run
CardAssistant diagnostics after rebooting with no drivers
loaded.