3Com TP16C - OfficeConnect Hub - EN User Manual - Page 7

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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.
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.
D

Dimensions and Operating Conditions

OfficeConnect Hub TP16C
S
ROBLEM
OLVING
IMENSIONS AND
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.
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
MDI/MDIX switch is set to MDIX (out). Also check that
the equipment being connected to the hub is powered
on, operating correctly and contains the correct type of
connection.
Link between two OfficeConnect hubs not working.
Check your hub connections; follow the information
given in the
" Connecting OfficeConnect Hubs Together "
section. With 10BASE-T it is likely that an MDI/MDIX
switch is incorrectly set. With 10BASE-2 (Coax) it is likely a
terminator (end piece) is not properly fitted; this would
cause the Coax Port Status LED to light yellow (partition).
S
TANDARDS
Standards
Functional:
Safety:
EMC:
Environmental:
†
Shielded Category 5 cables must be used to ensure compliance with
the Class B limits. The use of unscreened cable complies with the Class
A limits.
*Refer to the
" EMC Statements "
7
ISO 8802/3
IEEE 802.3
UL 1950, EN 60950
CSA 22.2 #950
†
EN 55022 Class B
EN 50082-1
†
FCC Part 15 Class B*
†
CSA C108.8 Class B
†
VCCI Class 2
EN 60068 (IEC 68)
section for conditions of operation.