®
OfficeConnect
Ethernet Hub 4, 4C, 8, 8C
User Guide (3C16704A, 3C16703A, 3C16700A, 3C16701A)
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Introduction 5
Problem Solving for the Hub 4 and 4C 15
Creating your Network 6
What Else Do I Need? 6
Workstation Connections 6
Transceiver Connections 6
Hub Connections 7
The OfficeConnect Ethernet Hub 8 and 8C 17
Ethernet Hub 8 and 8C—Front 17
Ethernet Hub 8 and 8C—Rear 18
Connecting Workstations and Other Equipment to Your Hub 19
Connecting OfficeConnect Ethernet Hubs Together 19
Connecting Hubs Using 10BASE-2 20
Checking Connections 20
10BASE-2 7
10BASE-T 7
Twisted Pair (TP) Cables 7
Stacking the Units Together 8
The Rubber Feet 8
Connecting Hubs Using 10BASE-T 21
Checking Connections 21
Spot Checks 21
The Stacking Clip 8
Problem Solving for the Hub 8 and 8C 22
Networking Terminology 24
Positioning Your Hub 9
Securing Your Hub 9
Using Your Hub 9
Dimensions and Standards 25
Dimensions and Operating Conditions 25
Standards 25
The OfficeConnect Ethernet Hub 4 and 4C 10
Ethernet Hub 4 and 4C—Front 10
Ethernet Hub 4 and 4C—Rear 11
Environmental Statements 26
Connecting Workstations and Other Equipment to Your Hub 12
Connecting Transceivers to the AUI Port 12
Connecting OfficeConnect Ethernet Hubs Together 12
Connecting Hubs Using 10BASE-2 13
Checking Connections 13
End Of Life Statement 26
Regulated Materials Statement 26
Environmental Statement about the Documentation 26
Environmental Statement about the Product Packaging 26
Connecting Hubs Using 10BASE-T 14
Checking Connections 14
Important Safety Information 27
Wichtige Sicherheitshinweise 28
Spot Checks 14
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Consignes importantes de sécurité 29
Technical Support 30
Online Technical Services 30
World Wide Web Site 30
3Com Knowledgebase Web Services 30
Support from Your Network Supplier 31
Support from 3Com 31
Returning Products for Repair 34
3Com Corporation Limited Warranty 35
Electromagnetic Compatibility 38
4
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INTRODUCTION
Welcome to the world of networking with 3Com®. In the
modern business environment, communication and sharing
information is crucial. Computer networks have proved to
be one of the fastest modes of communication but, until
recently, only large businesses could afford the advantage of
networking. The OfficeConnect® product range from 3Com
has changed this, bringing networks into the small office.
Figure 1 Small Network With OfficeConnect Hub and Optional
Print Server
HP JetDirect
OfficeConnect
print server
OfficeConnect hub
The OfficeConnect Ethernet Hub 4, OfficeConnect Ethernet
Hub 4C, OfficeConnect Ethernet Hub 8 and OfficeConnect
Ethernet Hub 8C, are ideal for creating small networks. They
are compact and attractively designed for desktop use.
These four products are part of the OfficeConnect range
which stack neatly together with the OfficeConnect stacking
clip.
This user guide describes how to use the OfficeConnect
hubs. The hubs have similar features and so this user guide
contains general and specific information. When referring to
all products, this guide uses the term ‘OfficeConnect hub’.
The OfficeConnect hubs have the following ports:
■ The Ethernet Hub 4 has four 10BASE-T ports.
■ The Ethernet Hub 4C has four 10BASE-T ports, a
A single OfficeConnect hub allows you to create a small
network with up to four or eight workstations, as shown in
Figure 1. If you need to connect more workstations, simply
use the stacking clip to connect another OfficeConnect hub
to form a stack (each hub is a single repeater).
10BASE-2 port and an AUI port.
■ The Ethernet Hub 8 has eight 10BASE-T ports.
■ The Ethernet Hub 8C has eight 10BASE-T ports and a
ninth 10BASE-2 port.
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CREATING YOUR NETWORK
2 An operating system (for example, Netware or
Windows 95/98) with network support configured,
running on your workstations.
What Else Do I Need?
Your OfficeConnect hub comes with:
■ One power adapter for use with the OfficeConnect hub.
■ A Product Registration card for you to fill out and return.
■ Four rubber feet.
3 One straight-through TP cable for every workstation, as
shown in Figure 2.
In order to comply with the 10BASE-T standard, ports
designed for workstation connections have been
marked with the graphical symbol ‘x’. This denotes a
crossover in the port’s internal wiring, for example 1x,
2x, 3x...
■ A stacking clip.
■ Two unit labels and eight cable ties.
■ An OfficeConnect Network Assistant CD-ROM.
Transceiver Connections
To connect workstations and additional OfficeConnect hubs
to your hub, you need extra equipment. The extra
equipment listed in the next section is not provided with
the hub.
If you want to connect a transceiver to your hub (Hub 4C
only), you need:
■ An AUI cable. The maximum length you can use is 50m
(164ft).
Workstation Connections
■ A 10Mbps Ethernet transceiver for the chosen media
To connect workstations and other equipment to your hub,
you need:
type. 3Com produce a range of easy to use transceivers.
1 10BASE-T connections for all
3
your equipment. 3Com produce
a range of easy to install
network adapter cards, which
2
1
provide your workstations with
10BASE-T connections.
6
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Hub Connections
10BASE-T
Depending on what ports your hub has, you can use either
10BASE-T or 10BASE-2 to connect your hubs together:
If you have additional hubs you want to connect using
10BASE-T, you need:
■ With 10BASE-2 you can connect up to 30 hubs on a
■ One straight-through TP cable for each extra hub.
single segment, leaving all of the 10BASE-T ports free.
Twisted Pair (TP) Cables
■ With 10BASE-T you can connect up to four hubs in
series.
To connect your workstations and hubs, you must use
straight-through TP cable with RJ-45 connectors. Cables can
be shielded (screened) or unshielded; we recommend that
you use shielded. The maximum length you can use is 100m
(328ft). A straight-through cable is one where the pins of
one connector are connected to the same pins of the other
connector.
10BASE-2
To connect additional hubs using 10BASE-2 (Hub 4C and 8C
only), you need (as shown in Figure 2):
■ One 10BASE-2 50 Ohm cable for each additional hub.
The minimum cable length you can use is 0.5m (1.6ft).
The maximum segment length is 185m (607ft).
■ One 10BASE-2 ‘Y’ piece for each hub. You can use ‘T’
pieces but ‘Y’ pieces provide optimal clearance of the
other ports.
■ Two 10BASE-2 50 Ohm terminators (end pieces).
Figure 2 Some of the 10BASE-2 Equipment You May Need
or
Terminator
(end piece)
‘Y’ piece
‘T’ piece
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To fit another unit:
Stacking the Units Together
The Rubber Feet
1 Rest the second unit on top of the clip and align it with
the front of the unit below.
2 Press down gently on the unit to secure it onto the clip,
ensuring the fastening pieces fit into the slots on the unit
below, as shown in Figure 3 (picture 2).
The four self-adhesive rubber feet prevent your hub from
moving around on your desk. Only stick the feet to the
marked areas at each corner of the underside of your hub if
you intend to place the unit directly on top of the desk. Do
not fix the feet if you are going to use the clip.
Figure 3 Stacking Your Units Together
1
2
Fastening
Piece
The Stacking Clip
Fastening
Piece
The blue stacking clip allows you to stack your
OfficeConnect units together securely.
CAUTION: You can stack up to a maximum of four
units. Smaller units must be stacked above larger
units.
To remove the clip:
To fit the clip:
1 Remove the top unit together with the clip. If you hook
a finger around one of the the fastening pieces and then
pull it gently from out of the slot, the clip should come
away with the upper unit attached to it.
1 Place your unit on a flat surface.
2 Fit the clip across the top of the unit, as shown in
Figure 3 (picture 1), ensuring that the longer sections of
the fastening pieces are pointing downwards.
2 Push the clip in the center, so it bends towards the base
3 Align the fastening pieces over the slots found on each
of the unit, and then separate once the clip is loose.
side of the unit.
4 Push the clip down gently to secure it, ensuring the
fastening pieces snap into the slots on the unit.
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Remove any connections to the hub and locate it over the
screw heads. When in line, gently push the hub on to the
wall and move it downwards to secure. When making
connections, be careful not to push the hub up and off the
wall.
Positioning Your Hub
When installing your OfficeConnect hub, ensure:
■ It is out of direct sunlight and away from sources of
heat.
CAUTION: Only wall mount single hubs, do not wall
mount stacked hubs.
■ Cabling is away from power lines, fluorescent lighting
fixtures, and sources of electrical noise such as radios,
transmitters and broadband amplifiers.
Also available from 3Com, is the OfficeConnect Mounting
Unit (part number 3C16765). This allows you to firmly
secure a stack of OfficeConnect devices to the desktop or
onto a shelf in a rack.
■ Water or moisture cannot enter the case of the unit.
■ Air flow around the unit and through the vents in the
side of the case is not restricted. We recommend you
provide a minimum of 25.4mm (1in.) clearance.
Using Your Hub
Securing Your Hub
You are now ready to create your network, using your
OfficeConnect hub.
There are two slots on the underside of the OfficeConnect
hub which can be used for wall mounting. It is
recommended that you mount the hubs with the LEDs
facing upwards to prevent dust entering the cooling vents.
Read pages 10–16 if you have an:
■ OfficeConnect Ethernet Hub 4 or Hub 4C
When wall mounting your hub, ensure that it is
within reach of the power outlet.
Read pages 17–23 if you have an:
■ OfficeConnect Ethernet Hub 8 or 8C
You need two suitable screws. Ensure that the wall you are
going to use is smooth, flat, dry and sturdy. Make two
screw holes which are 150mm (5.9in.) apart. Use the
template at the back of this guide to mark the position of
the holes. Fix the screws into the wall, leaving their heads
3mm (0.12in.) clear of the wall surface.
When you have connected your equipment, you are ready
to use your network. If you suspect there is a problem, refer
to (depending on your hub):
■ “Problem Solving for the Hub 4 and 4C” on page 15
■ “Problem Solving for the Hub 8 and 8C” on page 22
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THE OFFICECONNECT ETHERNET HUB 4 AND 4C
Ethernet Hub 4 and 4C—Front
Alert LED
Activity LED
(Hub 4 only)
yellow
Flashes each time
a packet is
received on a
port.
10BASE-T Port Status LEDs
green/yellow
Indicates the status of each 10BASE-T port.
green — The link between the port and the next
piece of network equipment is OK.
yellow — The port has partitioned due to a fault on
that segment.
Network Utilization LEDs (Hub 4C only)
green/yellow/orange
Indicates how much your network is being used.
orange
Alerts you to excessive
network use or an
isolated (partitioned)
10BASE-T port.
off — Nothing is connected to the port or the link
has failed.
AUI/COAX
Port Status
Network Utilization
Alert
Power ActivityCollision
1
2
3
4
1% 2% 3% 6% 12% 25% 50% 80%
OfficeConnect Ethernet Hub 4C
Green=AUI
off=COAX
Partitioned
Green = OK, Yellow = Partitioned
Power LED
green
Indicates that the hub is
powered on.
Collision LED
yellow
Flashes each time a collision is detected
on the network. Collisions are part of
normal network operation.
AUI/COAX Status LEDs (Hub 4C only)
green/off=media, yellow=partition
Indicates the status of the AUI or 10BASE-2 port, depending on which one is in use.
green/off — The left-hand status LED is green if the AUI port is in use, and off if either
the 10BASE-2 port is being used or nothing is connected to the port.
yellow — If the right-hand status LED is yellow, the port in use has been partitioned.
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Ethernet Hub 4 and 4C—Rear
Power Adapter socket
AUI port (Hub 4C only)
Four 10BASE-T RJ-45 ports
Use 10BASE-T cable with RJ-45
connectors. You can connect the
OfficeConnect hub to any workstation
or piece of equipment that has a
10BASE-T port. Refer to “Connecting
Hubs Using 10BASE-T” on page 14.
Only use the power adapter that is supplied with
Allows 10Mbps transceivers of different media types
to be connected to the hub. Connecting a
transceiver automatically disables the 10BASE-2
port.
this OfficeConnect hub. Do not use any other
adapter.
Uplink
Normal
1x
4
POWER
COAX
AUI
10BASE-2 port (Hub 4C only)
Uplink/Normal switch
Affects the operation of port 4. For correct usage, refer to
“Connecting Hubs Using 10BASE-T” on page 14.
Can be used to connect your hub to other OfficeConnect
hubs and equipment with 10BASE-2 cabling.
If used, it is effectively a fifth port. Refer to “Connecting
Hubs Using 10BASE-2” on page 13.
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The hub detects all port connections, so you can start using
your network immediately. When you need more ports,
simply add more OfficeConnect hubs.
Connecting Workstations and Other
Equipment to Your Hub
WARNING: Please read the ‘Important Safety
Information’ section before you start.
Connecting Transceivers to the AUI Port
You can connect a 10Mbps Ethernet transceiver to your hub
(Hub 4C only), using a standard AUI cable. Connect one
end of the cable to the transceiver and the other end to the
AUI port on the hub’s rear panel. This automatically disables
the 10BASE-2 port, and activates the AUI/COAX LED to
show the external transceiver is in use. Engage the slide
locks at both ends of the AUI cable.
WARNHINWEIS: Bitte lesen Sie den Abschnitt
‘Wichtige Sicherheitsinformationen’ sorgfältig durch,
bevor Sie das Gerät einschalten.
AVERTISSEMENT: Veuillez lire attentivement la
section “Consignes importantes de sécurité” avant de
mettre en route.
CAUTION: Do not power the hub off and on quickly.
Wait about five seconds between power cycles.
Connecting OfficeConnect Ethernet Hubs
Together
You can increase the number of workstations that can
connect to your network by adding more OfficeConnect
hubs. You can use either 10BASE-T or 10BASE-2 (Hub 4C
only) to do this.
Connect workstations and other equipment to any of the
hub’s 10BASE-T RJ-45 ports using 10BASE-T cables.
To connect a 10BASE-T cable, simply slot the connector into
the relevant RJ-45 port. When the connector is fully in, its
latch locks it into place. To disconnect the cable, push the
connector’s latch in and remove it.
Do not connect the same two hubs together using
both 10BASE-T and 10BASE-2. This causes a network
loop.
If you are using port 4 to connect to a workstation
using a straight-through TP cable, ensure the
Uplink/Normal switch is set to Normal (out).
If you do not use the 10BASE-2 port, you do not
need to connect a terminator (end piece) to it. If the
AUI port is not used and a terminator is not
connected to the 10BASE-2 port, the port partitions
and the Coax Status LED lights yellow. This is correct
operation.
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Figure 4 Correct Hub Connections Using 10BASE-2
Connecting Hubs Using 10BASE-2
Connect a 10BASE-2 ‘Y’ piece to each of your hubs
(Hub 4C only). Connect the ‘Y’ pieces with 10BASE-2 cable
to form a single segment, as shown in Figure 4. Remember
to terminate the two free ends of the segment by fitting
terminators (end pieces).
50 Ohm
terminator
AUI
U
Nor
p
lin
m
k
al
To disconnect a 10BASE-2 cable, twist each connector
counter-clockwise to unlock it, and remove it.
AUI
AUI
If you have connected a 10Mbps Ethernet transceiver
to the AUI port, the 10BASE-2 port will be disabled.
You can use this transceiver to connect your hubs but
we recommend that you connect your hubs using
10BASE-T cable (refer to the next section).
U
Nor
p
lin
m
k
al
AUI
U
Nor
p
lin
m
When using 10BASE-2 cable, it is important that both
ends of the segment are properly terminated with 50
Ohm terminators (end pieces).
k
al
‘Y’ piece
10BASE-2 50 Ohm cable.
Minimum length of
each cable is 0.5m (1.6ft)
Only use 50 Ohm 10BASE-2 cables and a ‘Y’ piece for
each hub. You can use ‘T’ pieces but ‘Y’ pieces
provide optimum clearance of the other ports.
50 Ohm
terminator
Maximum segment length is 185m (607ft)
(from terminator to terminator)
Checking Connections
When you have connected your hubs, power them on.
The Port Status LEDs for the 10BASE-2 ports you have used
should be off. If they are not, check your connections.
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If you suspect there is a problem, refer to “Problem Solving
for the Hub 4 and 4C” on page 15.
Connecting Hubs Using 10BASE-T
You can connect hubs together with 10BASE-T in a number
of ways, but for simplicity we recommend the following
method, as shown in Figure 5:
Figure 5 Correct Hub Connections Using 10BASE-T
1 Starting from the bottom, connect the port 4 of the
lower hub to port 3 of the hub immediately above.
Repeat this for each hub.
Switch set to
Normal (out)
Switches
set to
2 Set all Uplink/Normal switches to Uplink (in) except for
the top hub (the one with port 4 not connected to
another hub). This unused port can be connected to a
workstation provided that the Uplink/Normal switch is set
to Normal (out).
Uplink (in)
AUI
U
Nor
p
lin
m
k
al
4
Checking Connections
1x
AUI
When you have connected your hubs, power them on. The
Port Status LEDs for the 10BASE-T ports you have used
should be green. If they are not, check your connections. If
the 10BASE-2 port is not used and is not terminated and
the AUI port is not being used (if applicable), the LED
should be yellow showing that it has partitioned. This is
correct operation.
U
Nor
p
lin
m
k
al
1x
AUI
U
Nor
p
lin
k
m
al
Spot Checks
At frequent intervals, visually check that:
1x
10BASE-T cable
with RJ-45 connectors.
Maximum length of
■ The Alert LED is not lit — this is the best way to find out
if there are problems with your network
each cable is 100m (328ft)
■ Case vents are not obstructed
■ Cabling is secure and not pulled taut
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PROBLEM SOLVING FOR THE HUB 4 AND 4C
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.
It is likely
Port Status LED yellow for a 10BASE-T port.
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.
Perform these actions first:
Link between two OfficeConnect hubs not working.
Check your hub connections; follow the information given
for your hub. With 10BASE-T it is likely an Uplink/Normal
switch is incorrectly set. With 10BASE-2 it is likely a
terminator (end piece) is not properly fitted; this would
cause the Coax Port Status LED to light yellow (partition).
■ Ensure all equipment is powered on.
■ Power off the hubs, wait about 5 seconds and then
power on the hubs.
Check the following symptoms and solutions:
AUI/COAX Port Status LED not lit when external
transceiver in use. Check the AUI cable is correctly
connected to the hub and to the external transceiver. Ensure
both slide locks are engaged.
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.
AUI/COAX Port Status LED yellow when the 10BASE-2
port is not being used. The port has partitioned. This is
correct operation.
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.
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Port Status LED not lit for a 10BASE-T port that has a
connection. There is a problem with this connection.
Check that you are using a straight-through 10BASE-T cable
which is properly connected at both ends, and is not
damaged. If the cable is connected to port 4, ensure that
the Uplink/Normal switch is set to Normal (out). Also check
that the equipment being connected to the hub is powered
on and operating correctly. Refer to Figure 6 below to
compare the wiring of a straight-through and a crossover
cable.
Figure 6 Straight-through Cable/Crossover Cable
Straight-through
Crossover
TxD+
TxD-
RxD+
RxD-
1
2
3
6
1
2
3
6
TxD+
TxD-
RxD+
RxD-
TxD+
TxD-
RxD+
RxD-
1
2
3
6
1
2
3
6
TxD+
TxD-
RxD+
RxD-
Pins 4, 5, 7 and 8 are not used
Pins 4, 5, 7 and 8 are not used
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THE OFFICECONNECT ETHERNET HUB 8 AND 8C
Ethernet Hub 8 and 8C—Front
Alert LED
Activity LED
(Hub 8 only)
yellow
Flashes each time a
packet is received
on a port.
Port Status LEDs
orange
green/yellow
Alerts you to excessive
network use or an
isolated (partitioned)
10BASE-T port.
Indicates the status of each port.
green — The link between the port and the next piece of network equipment is OK.
yellow — The port has partitioned due to a fault on that segment.
off — Nothing is connected to the port or the link has failed.
The 10BASE-2 port LED (Hub 8C only) can only be yellow or off. It is yellow if the port has partitioned.
Port Status
Network Utilization
Power ActivityCollision
1
2
3
4
5
6
7
8
COAX
1% 2% 3% 6% 12% 25% 50% 80%
Alert
Green = OK, Yellow = Partitioned
OfficeConnect Ethernet Hub 8C
Power LED
green
Indicates that the hub is
powered on.
Collision LED
Network Utilization LEDs (Hub 8C only)
green/yellow/orange
Indicates how much your network is being used.
yellow
Flashes each time a collision is detected on the network.
Collisions are part of normal network operation.
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Ethernet Hub 8 and 8C—Rear
10BASE-2 port (Hub 8C only)
Eight 10BASE-T RJ-45 ports
Can be used to connect your hub to other OfficeConnect hubs
and equipment with 10BASE-2 cabling.
Use 10BASE-T cable with RJ-45 connectors. You can
connect the OfficeConnect hub to any workstation or
piece of equipment that has a 10BASE-T port. Port 8 can
be used to link to another OfficeConnect hub. Refer to
“Connecting Hubs Using 10BASE-T” on page 21.
If used, it is effectively a ninth port.
Refer to “Connecting Hubs Using 10BASE-2” on page 20.
8
1x
Uplink/Normal
POWER
COAX
Power Adapter socket
Uplink/Normal switch
Only use the power adapter that is
supplied with this OfficeConnect
hub. Do not use any other adapter.
Affects the operation of port 8. For correct usage,
refer to “Connecting Hubs Using 10BASE-T” on page 21.
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The hub detects all port connections, so you can start using
your network immediately. When you need more ports,
simply add more OfficeConnect hubs.
Connecting Workstations and Other
Equipment to Your Hub
WARNING: Please read the ‘Important Safety
Information’ section before you start.
Connecting OfficeConnect Ethernet Hubs
Together
WARNHINWEIS: Bitte lesen Sie den Abschnitt
‘Wichtige Sicherheitsinformationen’ sorgfältig durch,
bevor Sie das Gerät einschalten.
You can increase the number of workstations that can
connect to your network by adding more OfficeConnect
hubs. You can use either 10BASE-T or 10BASE-2 (Hub 8C
only) to do this.
AVERTISSEMENT: Veuillez lire attentivement la
section “Consignes importantes de sécurité” avant de
mettre en route.
Do not connect the same two hubs together using
both 10BASE-T and 10BASE-2. This causes a network
loop.
CAUTION: Do not power the hub off and on quickly.
Wait about five seconds between power cycles.
If you do not use the 10BASE-2 port, you do not
need to connect a terminator (end piece) to it. If a
terminator is not used, the port partitions and the
10BASE-2 Port Status LED lights yellow. This is correct
operation.
Connect workstations and other equipment to any of the
hub’s 10BASE-T RJ-45 ports using 10BASE-T cables.
To connect a 10BASE-T cable, simply slot the connector into
the relevant RJ-45 port. When the connector is fully in, its
latch locks it into place. To disconnect the cable, push the
connector’s latch in and remove it.
If you are using port 8 to connect to a workstation
using a straight-through TP cable, ensure the
Uplink/Normal switch is set to Normal (out).
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Figure 7 Correct Hub Connections Using 10BASE-2
Connecting Hubs Using 10BASE-2
Connect a 10BASE-2 ‘Y’ piece to each of your hubs
(Hub 8C only). Connect the ‘Y’ pieces with 10BASE-2 cable
to form a single segment, as shown in Figure 7. Remember
to terminate the two free ends of the segment by fitting
terminators (end pieces).
To disconnect a 10BASE-2 cable, twist each connector
counter-clockwise to unlock it, and remove it.
50 Ohm
terminator
When using 10BASE-2 cable, it is important that both
ends of the segment are properly terminated with
50 Ohm terminators (end pieces).
Only use 50 Ohm 10BASE-2 cables and a ‘Y’ piece for
each hub. You can use ‘T’ pieces but ‘Y’ pieces
provide optimum clearance of the other ports.
Checking Connections
When you have connected your hubs, power them on.
The Port Status LEDs for the 10BASE-2 ports you have used
should be off. If they are not, check your connections.
‘Y’ piece
10BASE-2 50 Ohm cable.
Minimum length of
each cable is 0.5m (1.6ft)
50 Ohm
terminator
Maximum segment length is 185m (607ft)
(from terminator to terminator)
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If you suspect there is a problem, refer to “Problem Solving
for the Hub 8 and 8C” on page 22.
Connecting Hubs Using 10BASE-T
You can connect hubs together with 10BASE-T in a number
of ways, but for simplicity we recommend the following
method, as shown in Figure 8:
Figure 8 Correct Hub Connections Using 10BASE-T
1 Starting from the bottom, connect the port 8 of the
lower hub to port 7 of the hub immediately above.
Repeat this for each hub.
2 Set all Uplink/Normal switches to Uplink (in) except for
the top hub (the one with port 8 not connected to
another hub). This unused port can be connected to a
workstation provided that the Uplink/Normal switch is set
to Normal (out).
Switch set to
Normal (out)
Checking Connections
Switch set to
Uplink (in)
When you have connected your hubs, power them on.
The Port Status LEDs for the 10BASE-T ports you have used
should be green. If they are not, check your connections.
If the 10BASE-2 port is not used and is not terminated, the
LED should be yellow showing that it has partitioned. This is
correct operation.
Switch set to
Uplink (in)
Spot Checks
At frequent intervals, visually check that:
10BASE-T cable
with RJ-45 connectors.
Maximum length of
■ The Alert LED is not lit — this is the best way to find out
if there are problems with your network.
each cable is 100m (328ft)
■ Case vents are not obstructed.
■ Cabling is secure and not pulled taut.
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PROBLEM SOLVING FOR THE HUB 8 AND 8C
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.
loop. Each piece of equipment needs only one connection
to your OfficeConnect 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.
Perform these actions first:
■ Ensure all equipment is powered on.
■ Power off the hubs, wait about 5 seconds and then
Port Status LED yellow for the 10BASE-2 port when
power on the hubs.
The port has
the 10BASE-2 port is not being used.
partitioned. This is correct operation.
Check the following symptoms and solutions:
Link between two OfficeConnect hubs not working.
Check your hub connections; follow the information given
for your hub. With 10BASE-T it is likely an Uplink/Normal
switch is incorrectly set. With 10BASE-2 it is likely a
terminator (end piece) is not properly fitted; this would
cause the 10BASE-2 Port Status LED to light yellow
(partition).
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
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Port Status LED not lit for a 10BASE-T port that has a
connection. There is a problem with this connection.
Check that you are using a straight-through 10BASE-T cable
which is properly connected at both ends, and is not
damaged. If the cable is connected to port 8, ensure that
the Uplink/Normal switch is set to Normal (out). Also check
that the equipment being connected to the hub is powered
on and operating correctly. Refer to Figure 9 below to
compare the wiring of a straight-through and a crossover
cable.
Figure 9 Straight-through Cable/Crossover Cable
Normal
port
Uplink Normal
Normal
port
Pin
1
Pin
1
Pin
1
Pin
1
port
port
Rx-
Rx+
Rx+
Rx-
Rx+
2
3
4
5
6
7
8
2
3
4
5
6
7
8
2
3
4
5
6
7
8
2
3
4
5
6
7
8
Rx+
Tx-
Rx-
Rx-
Tx+
Tx+
Tx+
Tx+
Tx-
Tx-
Tx-
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NETWORKING TERMINOLOGY
A Network is a collection of workstations (for example,
IBM-compatible personal computers) and other equipment
(for example, printers), connected for the purpose of
exchanging information. Networks vary in size, some are
within a single room, others span continents.
A
segment
is the length of Ethernet cable connected to a
port, whether this cable is 10BASE-T, 10BASE-2, or other
type. When you join equipment together with 10BASE-2
cable, via single speed hubs, the entire cable forms a single
segment.
A Local Area Network (LAN) is a network, usually in an
are the units of information your workstations and
Packets
office, that spans no more than a single site.
other equipment send to each other over the network.
Ethernet is a type of LAN, referring to the technology used
to pass information around the network.
Collisions are a part of normal Ethernet operation and
occur if two or more devices (pieces of network equipment)
attempt to transmit at the same time. A sudden sustained
increase in the number of collisions can indicate a problem
with a device, particularly if it is not accompanied by a
general increase in traffic. On coaxial segments an increase
in collisions can also indicate faulty cabling.
10BASE-T is the name given to the Ethernet protocol that
runs over Twisted Pair (TP) cable at 10Mbps. The
OfficeConnect hub uses RJ-45 type connectors for
connecting your TP network.
10BASE-2 is the name given to the Ethernet protocol that
runs over 50 Ohm Coaxial cable.
An AUI (Attachment Unit Interface) port is a standard
type of port used to connect 10Mbps Ethernet transceivers
to network equipment (Hub 8C only).
A Network Loop occurs when two pieces of network
equipment are connected by more than one path. Your hub
detects this and partitions (isolates) one of its ports to
break the loop.
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DIMENSIONS AND STANDARDS
Dimensions and Operating Conditions
Standards
Functional:
ISO 8802/3
IEEE 802.3
225mm (9in.)
0-40°C (32-105°F)
operating
Safety:
EMC:
UL 1950, EN 60950
CSA 22.2 #950
IEC 950
temperature
35.8mm
(1.4in.)
0-90%
(non-condensing)
humidity
135.4mm (5.3in.)
+ 15.2mm (0.6in.)
for 10BASE-2 port
(if applicable)
EN 55022 Class B†
EN 50082-1
FCC Part 15 Class B†*
ICES-003 Class B
VCCI Class B†
Power
Weight
CNS 13438 Class A
EN 60068 (IEC 68)
OfficeConnect Ethernet Hub 4
4 VA, 14 BThU/hr
500g (1.1 lb)
Environmental:
OfficeConnect Ethernet Hub 4C 12 VA, 40 BThU/hr 550g (1.2 lb)
OfficeConnect Ethernet Hub 8 11 VA, 38 BThU/hr 500g (1.1 lb)
OfficeConnect Ethernet Hub 8C 12 VA, 40 BThU/hr 550g (1.2 lb)
†Category 5 screened cables must be used to ensure
compliance with the Class B requirements of this standard.
The use of unscreened cables (category 3 or category 5)
complies with the Class A requirements.
*Refer to “Electromagnetic Compatibility” on page 38 for
conditions of operation.†
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ENVIRONMENTAL STATEMENTS
It is the policy of 3Com Corporation to be
environmentally-friendly in all operations. To uphold our
policy, we are committed to:
End Of Life Statement
3Com processes allow for the recovery, reclamation and safe
disposal of all end-of-life electronic components.
■ Establishing environmental performance standards that
comply with national legislation and regulations.
Regulated Materials Statement
■ Conserving energy, materials and natural resources in all
3Com products do not contain any hazardous or
ozone-depleting material.
operations.
■ Reducing the waste generated by all operations.
Environmental Statement about the Documentation
■ Ensuring that all waste conforms to recognized
The documentation for this product is printed on paper that
comes from sustainable, managed forests; it is fully
biodegradable and recyclable, and is completely
chlorine-free. The varnish is environmentally-friendly, and the
inks are vegetable-based with a low heavy-metal content.
environmental standards.
■ Maximizing the recyclable and reusable content of all
products.
■ Ensuring that all products can be recycled, reused and
disposed of safely.
Environmental Statement about the Product
Packaging
■ Ensuring that all products are labelled according to
recognized environmental standards.
The packaging for this product is fully recyclable. It has a
recycled (post consumer) waste content of at least 40% by
weight, and no heavy-metal content.
■ Improving our environmental record on a continual basis.
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IMPORTANT SAFETY INFORMATION
WARNING: Warnings contain directions that you
must follow for your personal safety. Follow all
directions carefully.
You must read the following safety information
carefully before you install or remove the unit:
■ There are no user-replaceable fuses or user-serviceable
parts inside the hub. If you have a physical problem with
the unit that cannot be solved with problem solving
actions in this guide, contact your supplier.
■ Disconnect the power adapter before moving the unit.
■ Exceptional care must be taken during installation and
WARNING: RJ-45 ports. These are shielded RJ-45
data sockets. They cannot be used as telephone
sockets. Only connect RJ-45 data connectors to these
sockets.
removal of the unit.
■ Only stack the OfficeConnect hub with other
OfficeConnect units.
■ To ensure compliance with international safety standards,
only use the power adapter that is supplied with the
unit.
■ The socket outlet must be near to the unit and easily
accessible. You can only remove power from the unit by
disconnecting the power cord from the outlet.
■ This unit operates under SELV (Safety Extra Low Voltage)
conditions according to IEC 950. The conditions are only
maintained if the equipment to which it is connected
also operates under SELV conditions.
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WICHTIGE SICHERHEITSHINWEISE
WARNHINWEIS: Warnhinweise enthalten
Anweisungen, die Sie zu Ihrer eigenen Sicherheit
befolgen müssen. Alle Anweisungen sind sorgfältig zu
befolgen.
Sie müssen die folgenden Sicherheitsinformationen
sorgfältig durchlesen, bevor Sie das Geräts installieren
oder ausbauen:
■ Es sind keine von dem Benutzer zu ersetzende oder zu
wartende Teile in dem Gerät vorhanden. Wenn Sie ein
Problem mit dem Switch haben, das nicht mittels der
Fehleranalyse in dieser Anleitung behoben werden kann,
setzen Sie sich mit Ihrem Lieferanten in Verbindung.
■ Vor dem Ausbau des Geräts das Netzadapterkabel
herausziehen.
■ Bei der Installation und beim Ausbau des Geräts ist mit
WARNHINWEIS: RJ-45-Anschlüsse. Dies sind
abgeschirmte RJ-45-Datenbuchsen. Sie können nicht
als Telefonanschlußbuchsen verwendet werden. An
diesen Buchsen dürfen nur RJ-45-Datenstecker
angeschlossen werden.
höchster Vorsicht vorzugehen.
■ Stapeln Sie das Geräts nur mit anderen OfficeConnect
Gerätes zusammen.
■ Aufgrund von internationalen Sicherheitsnormen darf das
Gerät nur mit dem mitgelieferten Netzadapter verwendet
werden.
■ Die Netzsteckdose muß in der Nähe des Geräts und
leicht zugänglich sein. Die Stromversorgung des Geräts
kann nur durch Herausziehen des Gerätenetzkabels aus
der Netzsteckdose unterbrochen werden.
■ Der Betrieb dieses Geräts erfolgt unter den
SELV-Bedingungen (Sicherheitskleinstspannung) gemäß
IEC 950. Diese Bedingungen sind nur gegeben, wenn
auch die an das Gerät angeschlossenen Geräte unter
SELV-Bedingungen betrieben werden.
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CONSIGNES IMPORTANTES DE SÉCURITÉ
AVERTISSEMENT: Les avertissements présentent des
consignes que vous devez respecter pour garantir
votre sécurité personnelle. Vous devez respecter
attentivement toutes les consignes.
Nous vous demandons de lire attentivement les
consignes suivantes de sécurité avant d’installer ou de
retirer l’appareil:
■ Il n’y a pas de parties remplaceables par les utilisateurs
ou entretenues par les utilisateurs à l’intérieur du moyeu.
Si vous avez un problème physique avec le moyeu qui ne
peut pas être résolu avec les actions de la résolution des
problèmes dans ce guide, contacter votre fournisseur.
■ Débranchez l'adaptateur électrique avant de retirer cet
appareil.
■ Faites très attention lors de l'installation et de la dépose
AVERTISSEMENT: Ports RJ-45. Il s'agit de prises
femelles blindées de données RJ-45. Vous ne pouvez
pas les utiliser comme prise de téléphone. Branchez
uniquement des connecteurs de données RJ-45 sur
ces prises femelles.
du groupe.
■ Seulement entasser le moyer avec les autres moyeux
OfficeConnects.
■ Pour garantir le respect des normes internationales de
sécurité, utilisez uniquement l'adaptateur électrique remis
avec cet appareil.
■ La prise secteur doit se trouver à proximité de l’appareil
et son accès doit être facile. Vous ne pouvez mettre
l’appareil hors circuit qu'en débranchant son cordon
électrique au niveau de cette prise.
■ L’appareil fonctionne à une tension extrêmement basse
de sécurité qui est conforme à la norme CEI 950. Ces
conditions ne sont maintenues que si l'équipement
auquel il est raccordé fonctionne dans les mêmes
conditions.
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TECHNICAL SUPPORT
3Com provides easy access to technical support information
through a variety of services. This section describes these
services.
This service provides access to online support information
such as technical documentation and software, as well as
support options that range from technical education to
maintenance and professional services.
Information contained in this section is correct at time of
publication. For the most recent information, 3Com
recommends that you access the 3Com Corporation World
Wide Web site.
3Com Knowledgebase Web Services
This interactive tool contains technical product information
compiled by 3Com expert technical engineers around the
globe. Located on the World Wide Web at:
Online Technical Services
.
3Com offers worldwide product support 24 hours a day,
7 days a week, through the following online systems:
This service gives all 3Com customers and partners
complementary, round-the-clock access to technical
information on most 3Com products.
■ World Wide Web site.
■ 3Com Knowledgebase Web Services.
World Wide Web Site
To access the latest networking information on the
3Com Corporation World Wide Web site, enter this URL
into your Internet browser:
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Support from Your Network Supplier
Support from 3Com
If you require additional assistance, contact your network
supplier. Many suppliers are authorized 3Com service
partners who are qualified to provide a variety of services,
including network planning, installation, hardware
maintenance, application training, and support services.
If you are unable to obtain assistance from the 3Com online
technical resources or from your network supplier, 3Com
offers technical telephone support services. To find out more
about your support options, call the 3Com technical
telephone support phone number at the location nearest
you.
When you contact your network supplier for assistance,
have the following information ready:
When you contact 3Com for assistance, have the following
information ready:
■ Product model name, part number, and serial number.
■ Product model name, part number, and serial number.
■ A list of system hardware and software, including revision
levels.
■ A list of system hardware and software, including revision
levels.
■ Diagnostic error messages.
■ Diagnostic error messages.
■ Details about recent configuration changes, if applicable.
■ Details about recent configuration changes, if applicable.
If you are unable to contact your network supplier, see the
following section on how to contact 3Com.
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Here is a list of worldwide technical telephone support
numbers:
Country
Telephone Number
Country
Telephone Number
Asia, Pacific Rim
Australia
Hong Kong
India
Indonesia
Japan
Malaysia
New Zealand
Pakistan
Philippines
1 800 678 515
800 933 486
P. R. o f C hin a
10800 61 00137 or
021 6350 1590
800 6161 463
+61 2 9937 5085
001 800 61 009
0031 61 6439
1800 801 777
0800 446 398
+61 2 9937 5085
1235 61 266 2602
Singapore
S. Korea
From anywhere in S. Korea: 00798 611 2230
From Seoul:
Taiwan, R.O.C.
Thailand
(0)2 3455 6455
0080 611 261
001 800 611 2000
Europe
From anywhere in Europe, call: +31 (0)30 6029900 phone
+31 (0)30 6029999 fax
Europe, South Africa, and Middle East
From the following countries, you may use the toll-free numbers:
Austria
Belgium
Denmark
Finland
France
Germany
Hungary
Ireland
Israel
0800 297468
0800 71429
800 17309
0800 113153
0800 917959
0800 1821502
00800 12813
1800 553117
1800 9453794
1678 79489
Netherlands
Norway
Poland
Portugal
South Africa
Spain
Sweden
Switzerland
U.K.
0800 0227788
800 11376
00800 3111206
0800 831416
0800 995014
900 983125
020 795482
0800 55 3072
0800 966197
Italy
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Country
Telephone Number
Country
Telephone Number
Latin America
Argentina
Brazil
Chile
Colombia
AT&T +800 666 5065
0800 13 3266
1230 020 0645
98012 2127
Mexico
Peru
Puerto Rico
Venezuela
01 800 CARE (01 800
2273)
AT&T +800 666 5065
800 666 5065
AT&T +800 666 5065
North America
1 800 876-3266
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Country
Telephone Number
Fax Number
Returning Products for Repair
Austria
0800 297468
0800 71429
800 17309
Before you send a product directly to 3Com for repair, you
must first obtain a Return Material Authorization (RMA)
number. Products sent to 3Com without authorization
numbers will be returned to the sender unopened, at the
sender’s expense.
Belgium
Denmark
Finland
France
Germany
Hungary
Ireland
0800 113153
0800 917959
0800 1821502
00800 12813
1800553117
1800 9453794
1678 79489
0800 0227788
800 11376
00800 3111206
0800 831416
0800 995014
900 983125
020 795482
0800 55 3072
0800 966197
Israel
Italy
To obtain an authorization number, call or fax:
Netherlands
Norway
Poland
Portugal
South Africa
Spain
Sweden
Switzerland
U.K.
Country
Telephone Number
+ 65 543 6500
Fax Number
Asia, Pacific Rim
+ 65 543 6348
Europe, South Africa,
and Middle East
+ 31 30 6029900
+ 31 30
6029999
Latin America
1 408 326 2927
1 408 326 3355
From the following countries, you may call the toll-free numbers;
select option 2 and then option 2:
U.S.A. and Canada
1 800 876 3266
1 408 326 7120
(not toll-free)
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media with software which substantially conforms to applicable 3Com published
specifications. Customer assumes responsibility for the selection of the
appropriate applications program and associated reference materials. 3Com
makes no warranty or representation that its software products will meet
Customer’s requirements or work in combination with any hardware or
applications software products provided by third parties, that the operation of the
software products will be uninterrupted or error free, or that all defects in the
software products will be corrected. For any third party products listed in the
3Com software product documentation or specifications as being compatible,
3Com will make reasonable efforts to provide compatibility, except where the
non-compatibility is caused by a "bug" or defect in the third party's product or
from use of the software product not in accordance with 3Com’s published
specifications or user manual.
3Com Corporation Limited Warranty
3Com OfficeConnect Ethernet Hub 4, 4C, 8, 8C
The duration of the warranty for the OfficeConnect Ethernet Hub 4, 4C, 8, 8C
(3C16704A, 3C16703A, 3C16700A, 3C16701A) is lifetime, including the power
adapter.
Advance hardware exchange is available during the first year from your date of
purchase in accordance with 3Com’s standard terms and conditions for such
service. After the first year the warranty reverts to 3Com’s standard lifetime
limited warranty.
To qualify for the lifetime limited warranty and the advance hardware exchange
you must submit the appropriate product warranty registration card to 3Com,
otherwise this product will be warranted for a period of one (1) year without
advance hardware exchange.
YEAR 2000 WARRANTY
In addition to the Hardware Warranty and Software Warranty stated above,
3Com warrants that each product sold or licensed to Customer on and after
January 1, 1998 that is date sensitive will continue performing properly with
regard to such date data on and after January 1, 2000, provided that all other
products used by Customer in connection or combination with the 3Com
product, including hardware, software, and firmware, accurately exchange date
data with the 3Com product, with the exception of those products identified at
this standard. If it appears that any product that is stated to meet this standard
does not perform properly with regard to such date data on and after January 1,
2000, and Customer notifies 3Com before the later of April 1, 2000, or ninety
(90) days after purchase of the product from 3Com or its authorized reseller,
3Com shall, at its option and expense, provide a software update which would
effect the proper performance of such product, repair such product, deliver to
Customer an equivalent product to replace such product, or if none of the
foregoing is feasible, refund to Customer the purchase price paid for such
product.
HARDWARE
3Com warrants this hardware product to be free from defects in workmanship
and materials, under normal use and service, for the following length of time
from the date of purchase from 3Com or its authorized reseller:
One (1) year (unless otherwise specified above)
3Com’s sole obligation under this express warranty shall be, at 3Com’s option
and expense, to repair the defective product or part, deliver to Customer an
equivalent product or part to replace the defective item, or if neither of the two
foregoing options is reasonably available, 3Com may, in its sole discretion, refund
to Customer the purchase price paid for the defective product. All products that
are replaced will become the property of 3Com. Replacement products may be
new or reconditioned. 3Com warrants any replaced or repaired product or part
for ninety (90) days from shipment, or the remainder of the initial warranty
period, whichever is longer.
Any software update or replaced or repaired product will carry a Year 2000
Warranty for ninety (90) days after purchase or until April 1, 2000, whichever is
later.
SOFTWARE
3Com warrants that each software program licensed from it will perform in
substantial conformance to its program specifications, for a period of ninety (90)
days from the date of purchase from 3Com or its authorized reseller. 3Com
warrants the media containing software against failure during the warranty
period. No updates are provided. 3Com's sole obligation under this express
warranty shall be, at 3Com's option and expense, to refund the purchase price
paid by Customer for any defective software product, or to replace any defective
OBTAINING WARRANTY SERVICE
Customer must contact a 3Com Corporate Service Center or an Authorized 3Com
Service Center within the applicable warranty period to obtain warranty service
authorization. Dated proof of purchase from 3Com or its authorized reseller may
be required. Products returned to 3Com's Corporate Service Center must be
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pre-authorized by 3Com with a Return Material Authorization (RMA) number
marked on the outside of the package, and sent prepaid and packaged
appropriately for safe shipment, and it is recommended that they be insured or
sent by a method that provides for tracking of the package. The repaired or
replaced item will be shipped to Customer, at 3Com's expense, not later than
thirty (30) days after 3Com receives the defective product.
WARRANTIES EXCLUSIVE
IF A 3COM PRODUCT DOES NOT OPERATE AS WARRANTED ABOVE,
CUSTOMER'S SOLE REMEDY FOR BREACH OF THAT WARRANTY SHALL BE
REPAIR, REPLACEMENT, OR REFUND OF THE PURCHASE PRICE PAID, AT 3COM'S
OPTION. TO THE FULL EXTENT ALLOWED BY LAW, THE FOREGOING
WARRANTIES AND REMEDIES ARE EXCLUSIVE AND ARE IN LIEU OF ALL OTHER
WARRANTIES, TERMS, OR CONDITIONS, EXPRESS OR IMPLIED, EITHER IN FACT
OR BY OPERATION OF LAW, STATUTORY OR OTHERWISE, INCLUDING
WARRANTIES, TERMS, OR CONDITIONS OF MERCHANTABILITY, FITNESS FOR A
PARTICULAR PURPOSE, SATISFACTORY QUALITY, CORRESPONDENCE WITH
DESCRIPTION, AND NON-INFRINGEMENT, ALL OF WHICH ARE EXPRESSLY
DISCLAIMED. 3COM NEITHER ASSUMES NOR AUTHORIZES ANY OTHER PERSON
TO ASSUME FOR IT ANY OTHER LIABILITY IN CONNECTION WITH THE SALE,
INSTALLATION, MAINTENANCE OR USE OF ITS PRODUCTS.
Dead- or Defective-on-Arrival. In the event a product completely fails to function
or exhibits a defect in materials or workmanship within the first forty-eight (48)
hours of installation but no later than thirty (30) days after the date of purchase,
and this is verified by 3Com, it will be considered dead- or defective-on-arrival
(DOA) and a replacement shall be provided by advance replacement. The
replacement product will normally be shipped not later than three (3) business
days after 3Com’s verification of the DOA product, but may be delayed due to
export or import procedures. When an advance replacement is provided and
Customer fails to return the original product to 3Com within fifteen (15) days
after shipment of the replacement, 3Com will charge Customer for the
replacement product, at list price.
3COM SHALL NOT BE LIABLE UNDER THIS WARRANTY IF ITS TESTING AND
EXAMINATION DISCLOSE THAT THE ALLEGED DEFECT OR MALFUNCTION IN THE
PRODUCT DOES NOT EXIST OR WAS CAUSED BY CUSTOMER'S OR ANY THIRD
PERSON'S MISUSE, NEGLECT, IMPROPER INSTALLATION OR TESTING,
UNAUTHORIZED ATTEMPTS TO OPEN, REPAIR OR MODIFY THE PRODUCT, OR
ANY OTHER CAUSE BEYOND THE RANGE OF THE INTENDED USE, OR BY
ACCIDENT, FIRE, LIGHTNING, OTHER HAZARDS, OR ACTS OF GOD.
3Com shall not be responsible for any software, firmware, information, or
memory data of Customer contained in, stored on, or integrated with any
products returned to 3Com for repair, whether under warranty or not.
ADDITIONAL SERVICES:
Telephone Support. This OfficeConnect® product comes with telephone technical
support for ninety (90) days. The ninety (90) day period begins on the date of
Customer's product purchase.
LIMITATION OF LIABILITY
The telephone technical support is available from 3Com from 9 a.m. to 5 p.m.,
local time, Monday through Friday, excluding local holidays. Telephone technical
support is limited to the 3Com products designated above and may include
assistance with installation, product specific configuration, and identification of
equipment problems. Please refer to the Technical Support appendix in the User
Guide for telephone numbers.
TO THE FULL EXTENT ALLOWED BY LAW, 3COM ALSO EXCLUDES FOR ITSELF
AND ITS SUPPLIERS ANY LIABILITY, WHETHER BASED IN CONTRACT OR TORT
(INCLUDING NEGLIGENCE), FOR INCIDENTAL, CONSEQUENTIAL, INDIRECT,
SPECIAL, OR PUNITIVE DAMAGES OF ANY KIND, OR FOR LOSS OF REVENUE OR
PROFITS, LOSS OF BUSINESS, LOSS OF INFORMATION OR DATA, OR OTHER
FINANCIAL LOSS ARISING OUT OF OR IN CONNECTION WITH THE SALE,
INSTALLATION, MAINTENANCE, USE, PERFORMANCE, FAILURE, OR INTERRUPTION
OF ITS PRODUCTS, EVEN IF 3COM OR ITS AUTHORIZED RESELLER HAS BEEN
ADVISED OF THE POSSIBILITY OF SUCH DAMAGES, AND LIMITS ITS LIABILITY TO
REPAIR, REPLACEMENT, OR REFUND OF THE PURCHASE PRICE PAID, AT 3COM'S
OPTION. THIS DISCLAIMER OF LIABILITY FOR DAMAGES WILL NOT BE AFFECTED
IF ANY REMEDY PROVIDED HEREIN SHALL FAIL OF ITS ESSENTIAL PURPOSE.
Response to requests for telephone technical support will be in the form of a
return call from a 3Com representative by close of business the following business
day.
To qualify for this 90 days of telephone technical support, you must register on
of purchase, product number, and serial number. 3Com reserves the right to
modify or cancel this telephone support offering at any time, without advance
notice. This offer is not available where prohibited or restricted by law.
3Com’s Web and Bulletin Board Service are available at no charge, and provide
software and firmware upgrades, a bug list, and technical information about
3Com products.
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DISCLAIMER
Some countries, states, or provinces do not allow the exclusion or limitation of
implied warranties or the limitation of incidental or consequential damages for
certain products supplied to consumers, or the limitation of liability for personal
injury, so the above limitations and exclusions may be limited in their application
to you. When the implied warranties are not allowed to be excluded in their
entirety, they will be limited to the duration of the applicable written warranty.
This warranty gives you specific legal rights which may vary depending on local
law.
GOVERNING LAW
This Limited Warranty shall be governed by the laws of the State of California,
U.S.A. excluding its conflicts of laws principles and excluding the United Nations
Convention on Contracts for the International Sale of Goods.
3Com Corporation
5400 Bayfront Plaza
Santa Clara, CA 95054
(408) 326-5000
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ELECTROMAGNETIC COMPATIBILITY
VCCI STATEMENT
FCC STATEMENT
This equipment has been tested and found to comply with the limits for a Class B
digital device, pursuant to Part 15 of the FCC Rules, and the Canadian
Department of Communications Equipment Standards entitled, “Digital
Apparatus,” ICES-003. These limits are designed to provide reasonable protection
against harmful interference in a residential installation. This equipment
generates, uses and can radiate radio frequency energy and, if not installed and
used in accordance with the instructions, may cause harmful interference to radio
communications. However, there is no guarantee that interference will not occur
in a particular installation.
BCIQ STATEMENT
If this equipment does cause interference to radio or television reception, which
can be determined by turning the equipment off and on, the user is encouraged
to try to correct the interference by one or more of the following measures:
■
■
■
■
Reorient the receiving antenna.
Relocate the equipment with respect to the receiver.
Move the equipment away from the receiver.
Plug the equipment into a different outlet so that equipment and receiver are
on different branch circuits.
INFORMATION TO THE USER
The user may find the following booklet prepared by the Federal Communications
Commission helpful:
■
Consult the dealer or an experienced radio/television technician for help.
How to Identify and Resolve Radio-TV Interference Problems
CSA STATEMENT
This booklet is available from the U.S. Government Printing Office, Washington,
DC 20402, Stock No. 004-000-00345-4.
This Class B digital apparatus meets all requirements of the Canadian
Interference-Causing Equipment Regulations.
In order to meet FCC emissions limits, this equipment must be used only with
cables which comply with IEEE 802.3.
Cet appareil numérique de la classe B respecte toutes les exigences du Règlement
sur le matériel brouilleur du Canada.
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Wall mounting screw hole guide
150 mm (5.9 in)
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