Problem Solving - 3Com OfficeConnect User Manual

P S
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 equipment is powered on.
■
Power each unit off, wait about 5 seconds and then
■
power them 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 another OfficeConnect
power adapter. Do not use any other power adapter
with the hub.
Port Status LED yellow for a 10BASE-T port. It is likely
that there is a loop in your network which has caused this
port to partition. Examine your connections and remove the
loop. Each piece of equipment needs only one connection
to your OfficeConnect hub. The LED will change from
yellow to green, on receiving a valid packet on the port.
Link between two OfficeConnect hubs not working.
Check your hub connections; follow the information given in
"Connecting OfficeConnect Hubs Together"
the
With 10BASE-T it is likely that an Uplink/Normal switch is
incorrectly set. With 10BASE-2 (Coaxial) it is likely a terminator
(end piece) is not properly fitted; this would cause the Coaxial
Port Status LED to light yellow (partition).
Alert LED continuously lit. There is either continual
excessive use of your network (over 80%) or, more likely, a
10BASE-T port has partitioned due to a loop in your
network (in which case the corresponding Port Status LED
will be yellow). Examine your connections and remove the
loop. Each piece of equipment needs only one connection
to your OfficeConnect hub.
Port Status LED not lit for a port that has a
connection. There is a problem with this connection. Check
that you are using a 'Straight-through' cable which is
properly connected at both ends, and is not damaged. If the
cable is connected to port 16, ensure that the
Uplink/Normal switch is set to Normal (out). Also check that
the equipment being connected to the hub is powered on,
operating correctly and contains the correct type of
connection.
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