Problem Solving - 3Com 3C16753 - OfficeConnect Dual Speed Hub 8 User Manual

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ROBLEM OLVING
The OfficeConnect Hub has been designed to aid you when
detecting and solving possible problems with your network.
These problems are rarely serious; the cause is usually a
disconnected or damaged cable, or incorrect configuration.
If this section does not solve your problem, contact your
supplier for information on what to do next.
Perform these actions first:
Ensure all network equipment is powered on.
Power each piece of network equipment off, wait about
5 seconds and then power each one on.
Check the following symptoms and solutions:
Power LED not lit. Check your power adapter connection.
If there is still no power, you may have a faulty power
adapter which needs replacing with an identical
OfficeConnect power adapter. Do not use any other
power adapter with the Hub.
10Mbps Port Status LED lit for a port with a 100Mbps
device connected. This may be because the cable is not of
a high enough quality to carry Fast Ethernet signals (we
recommend you use a Category 5 cable), or due to a
problem with the network card (NIC) of the attached
equipment.
Link between the Hub and another OfficeConnect hub
not working. Check your connections; follow the
information given in the "Connecting Another
OfficeConnect Hub" section on page 13. It is likely that an
Uplink/Normal switch is incorrectly set.
Port Status LED not lit for a port that has a
connection. Check the following:
You are using a 'straight-through' cable which is properly
connected at both ends, and is not damaged. Refer to
"Twisted Pair (TP) Cables" on page 10.
The equipment connected to the Hub is powered on,
operating correctly and contains the correct type of
connection. Refer to Figure 6 to compare the wiring of a
straight-through and a crossover cable.
Your PCs network drivers have loaded and initialised
correctly.
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