3Com OfficeConnect 140 Benutzerhandbuch - Seite 7

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The OfficeConnect switch 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 switch.
Alert LED continuously lit. If the Alert LED is lit, there is
a problem with the network. Starting with the
100BASE-TX port, remove the port connections one at a
time, waiting a few seconds between each port. If the
Alert LED goes off, there is either a network loop or an
excessive amount of broadcast traffic on that port
connection:
Network loop — Examine your connections and
remove the loop. Each piece of equipment needs
only one connection to your switch.
D

Dimensions and Operating Conditions

OfficeConnect Switch 140
S
ROBLEM
OLVING
IMENSIONS AND
Excessive amounts of broadcast frames — Some
pieces of network equipment operate by sending
out broadcast frames regularly. Refer to the
documentation that accompanies the piece of
network equipment.
If the Alert LED is still lit after removing all of your
connections, there may be a problem with your unit.
Power it off, wait about 5 seconds and then power it on.
If the Alert LED comes back on continuously, contact
your supplier.
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. Also check that the equipment being
connected to the hub is powered on, operating correctly
and contains the correct type of connection.
Link between the switch and an OfficeConnect hub
not working. Check your connections; follow the
information given in the
Hubs to Your Switch "
MDI/MDIX switch is incorrectly set on the switch
(for 100BASE-TX) or hub (for 10BASE-T).
S
TANDARDS
Standards
Functional:
Safety:
EMC:
[screened (shielded) cables must be used to ensure
compliance with these EMC standards]
Environmental:
Acoustic Noise:
*Refer to the
" EMC Statements "
7
" Connecting OfficeConnect
section. It is likely that an
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 *
C SA C108.8-M1983 C lass B
VCCI Class 2
EN 60068 (IEC 68 )
ISO 7779
ISO 9295
section for conditions of operation.