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3-1.2 Workstation Problems
Most non-cabling problems result from improper configuration of the
network interface card (NIC) and its corresponding driver. The following
points will be helpful:
• Like other add-on cards in the workstation or server, NIC must
have unique memory address, I/O address, and interrupt. The
settings on a particular card must not conflict with the settings
on any other card in the same station. Please refer the User’s
manual of the NIC, computers, and Networking operating
systems to determine the proper configuration.
• The selection of half or full duplex, the speed of 10 or 100Mbps
for the NIC setting must match the mode and speed setting of
the corresponding port of the Hub. For NWay Auto-
Negotiation setting, both link partners will auto-adjust to the
highest allowable speed and mode operation.
• If a workstation (workstation A) does not work and other
100Base-X ports on the hub are functioning, remove a fiber/
RJ-45 plug from a functioning port with a functioning
workstation (workstation B) and insert it into the suspect port.
If workstation B still works, the problem is in workstation A or
in the wiring. However, if workstation B does not work, then
the hub may have a defective port. Even if you suspect a
defective port on the hub, continue testing. Improperly wired
workstations may appear to be functional, especially if they are
located near the hub. Sometimes, a port connected to an
improperly wired workstation can function marginally while
another port may not work at all.
• Once you have established that the hub is working properly,
check all wiring between the hub and the malfunctioning
workstation. Ensure that the transmit and receive wires have
not been crossed; the two transmit wires should be paired
together as should the two receive wires.
• Use a continuity checker to ensure that wires do not have
breaks. By shorting together the two wires of a pair at one end,
you can use the continuity checker at the other end. Also, check
that there are no shorts between wires.
