3Com TP800 - OfficeConnect Hub Benutzerhandbuch - Seite 5

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Connecting to 10BASE-T Networks

Your OfficeConnect Hub can be connected to a
10BASE-T network through an OfficeConnect switch
(for example, an OfficeConnect Switch 140). Refer to the
accompanying OfficeConnect Product Range sheet.
Powering Up and Checking Connections
When you have connected your hubs, power them on.
The Port Status LEDs for the ports you have used should
be green. If they are not, check your connections.
P
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:
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Ensure all equipment is powered on.
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Power each hub 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.
Alert LED continuously lit. There is either continual
excessive use of your network (over 80%) or, more likely,
a 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 particular
connection. Check that the equipment connected to
the hub is powered on, operating correctly, and
contains a 100BASE-TX connection. The hub can be
directly connected only to equipment that can
provide a 100Mbps connection (not 10Mbps only).
In particular, ensure that:
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You are using a 100Mbps adapter in your workstation,
if connecting a workstation to the hub. If your adapter
can operate at various speeds, ensure that it is set to
operate at 100Mbps.
3
Any 10Mbps equipment that you want to link to the
hub, is connected through a 10/100 hub or switch.
S
ROBLEM
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Spot Checks
At frequent intervals, visually check that:
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The Alert LED is not lit — this is the best way to find out
if there are problems with your network
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Case vents are not obstructed
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Cabling is secure and not pulled taut
3
You are using a 'Straight-through' 100BASE-TX cable
that is properly connected at both ends, and is not
damaged. Refer to the diagram below to compare the
wiring of a straight-through and a crossover cable.
Straight-through Cable
Port Status LED yellow. 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.
Link between two OfficeConnect hubs not working.
Check your hub connections; follow the information
given in the
"Connecting OfficeConnect Hubs
Together"
section. It is likely that an MDI/MDIX switch is
incorrectly set.
Workstation connection not working. Check that you
are using a 100Mbps adapter in your workstation. If
your adapter can operate at various speeds, ensure that
it is set to operate at 100Mbps.
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Crossover Cable