3Com OfficeConnect Hub 12 User manual

OfficeConnect®
Fast Ethernet Hub 4, Hub 8, Hub 12
User Guide (3C16723A, 3C16722A, 3C16721A)
3C16721.book Page i Wednesday, July 7, 1999 3:05 PM

3Com Corporation ■5400 Bayfront Plaza ■Santa Clara, California ■95052-8145
Copyright © 1999, 3Com Technologies. All rights reserved.
No part of this documentation may be reproduced in any form or by any means
or used to make any derivative work (such as translation, transformation, or
adaptation) without written permission from 3Com Technologies.
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changes in content from time to time without obligation on the part of 3Com
Technologies to provide notification of such revision or change.
3Com Technologies provides this documentation without warranty, term, or
condition of any kind, either implied or expressed, including, but not limited to,
the implied warranties, terms or conditions of merchantability, satisfactory
quality, and fitness for a particular purpose. 3Com may make improvements or
changes in the product(s) and/or the program(s) described in this documentation
at any time.
If there is any software on removable media described in this documentation, it
is furnished under a license agreement included with the product as a separate
document, in the hard copy documentation, or on the removable media in a
directory file named LICENSE.TXT or !LICENSE.TXT. If you are unable to locate a
copy, please contact 3Com and a copy will be provided to you.
UNITED STATES GOVERNMENT LEGEND
If you are a United States government agency, then this documentation and the
software described herein are provided to you subject to the following:
All technical data and computer software are commercial in nature and
developed solely at private expense. Software is delivered as “Commercial
Computer Software” as defined in DFARS 252.227-7014 (June 1995) or as a
“commercial item” as defined in FAR 2.101(a) and as such is provided with only
such rights as are provided in 3Com’s standard commercial license for the
Software. Technical data is provided with limited rights only as provided in DFAR
252.227-7015 (Nov 1995) or FAR 52.227-14 (June 1987), whichever is
applicable. You agree not to remove or deface any portion of any legend
provided on any licensed program or documentation contained in, or delivered to
you in conjunction with, this User Guide.
Unless otherwise indicated, 3Com registered trademarks are registered in the
United States and may or may not be registered in other countries.
3Com, the 3Com logo and OfficeConnect are registered trademarks of
3Com Corporation.
Microsoft, MS-DOS, Windows, and Windows NT are registered trademarks of
Microsoft Corporation. Novell and NetWare are registered trademarks of
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All other company and product names may be trademarks of the respective
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Year 2000 Compliance: For information on Year 2000 compliance and 3Com
products, visit the 3Com Year 2000 Web page:
http://www.3com.com/products/yr2000.html
Environmental Statement: Please recycle this user guide after use.
Please e-mail any comments about this document to 3Com at:
[e-mail]. Please include the document title
(OfficeConnect Fast Ethernet Hub 4, 8 12 User Guide), part number
(DUA1672-1AAA03) and, if appropriate, the page number.
3C16721.book Page ii Wednesday, July 7, 1999 3:05 PM

3
Introduction 5
Creating Your Network 6
Fast Ethernet Hub 4 and Hub 8—Front 6
Fast Ethernet Hub 4 and Hub 8—Rear 7
Fast Ethernet Hub 12—Front 8
Fast Ethernet Hub 12—Rear 9
Before You Start 10
Workstation Connections 10
Hub Connections 10
Stacking the Units Together 11
The Rubber Feet 11
The Stacking Clip 11
Positioning Your OfficeConnect Hub 12
Securing Your Hub 12
Connecting Workstations and Other Equipment to Your Hub 13
Connecting OfficeConnect Hubs Together 13
Connecting 100BASE-TX Hubs 14
Connecting to 10BASE-T Networks 14
Checking Hub Connections 14
Spot Checks 14
Problem Solving 15
Networking Terminology 17
Dimensions and Standards 18
Dimensions and Operating Conditions 18
Standards 19
Environmental Statements 20
End Of Life Statement 20
Regulated Materials Statement 20
Environmental Statement about the Documentation 20
Environmental Statement about the Product Packaging 20
Important Safety Information 21
Wichtige Sicherheitshinweise 22
Consignes importantes de sécurité 23
Technical Support 24
Online Technical Services 24
World Wide Web Site 24
3Com Knowledgebase Web Services 24
Support from Your Network Supplier 25
Support from 3Com 25
Returning Products for Repair 28
3Com Corporation Limited Warranty 29
Electromagnetic Compatibility 32
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4
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5
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 networking
advantage. The OfficeConnect® product range from 3Com
has changed this, bringing networks to the small office.
The OfficeConnect Fast Ethernet Hub 4, Hub 8, and Hub 12
are ideal for creating small, fast (high bandwidth) networks.
They are compact and attractively designed for desktop use.
These products are part of the OfficeConnect range, which
neatly stack together with the OfficeConnect Stacking Clip.
When referring to all three products, this guide uses the
term ‘OfficeConnect hub’.
The OfficeConnect hub is a Fast Ethernet (Class II) repeater,
allowing the creation of a network that runs 10 times faster
than standard Ethernet. You can connect a workstation,
server or other piece of equipment to each 100BASE-TX
port, as shown in Figure 1. The Hub 4 has four 100BASE-TX
ports, the Hub 8 has eight, and the Hub 12 has twelve.
Figure 1 Small Network Featuring OfficeConnect Fast Ethernet
Hub 4 and Server
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 Class II repeater).
OfficeConnect hub
Network server
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6
CREATING Y
OUR NETWORK
Fast Ethernet Hub 4 and Hub 8—Front
12345678 1% 2% 3% 6% 12% 25% 50% 80%
Port Status Network Utilization
Green = OK, Yellow = Partitioned
Alert
OfficeConnect Fast Ethernet Hub 8
Power
Collision
Activity
Alert LED
orange
Alerts you to
excessive network
use or a
partitioned
100BASE-TX port.
Power LED
green
Indicates that
the power
supply to the
hub is present.
Collision LED
yellow
Flashes each time a
collision is detected
at the hub. Collisions
are part of normal
network operation.
Network Utilization
LEDs (Hub 8 only)
green/yellow/orange
Indicates how much your
network is being used.
Port Status LEDs
green/yellow
Indicates the status of each port. If
nothing is connected, the LED is off.
If green, the link between the port
and the next piece of network
equipment is OK.
If yellow, the port has partitioned due
to a fault on that segment.
Activity LED
(Hub 4 only)
yellow
Flashes each time a
packet is received
on a port.
3C16721.book Page 6 Wednesday, July 7, 1999 3:05 PM

7
Fast Ethernet Hub 4 and Hub 8—Rear
Power adapter socket
Only use the power adapter that is
supplied with this OfficeConnect
hub. Do not use any other adapter.
Uplink/Normal switch
Affects the operation of the highest numbered port
(port 4 on Hub 4 and port 8 on Hub 8). For connecting
the port to a workstation, set to Normal (out). For
connecting the port to another OfficeConnect unit, set
to Uplink (in). Refer to the “Connecting OfficeConnect
Hubs Together” section.
100BASE-TX RJ-45 ports
Use 100BASE-TX cable with RJ-45 connectors.
You can connect the OfficeConnect hub to any
workstation or piece of equipment that has a
100BASE-TX port. The highest numbered port
can be used to link to another OfficeConnect
unit. Refer to the “Connecting OfficeConnect
Hubs Together” section.
POWER
81X
Uplink/Normal
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8
Fast Ethernet Hub 12—Front
7
1
8
2
9
3
10
4
11
5
12
6
1% 2% 3% 6% 12% 25% 50% 80%
Port Status Network Utilization
OfficeConnect Fast Ethernet Hub 12
Alert
Power
Collision
Green = OK, Yellow = Partitioned
Alert LED
orange
Alerts you to
excessive network
use or a
partitioned
100BASE-TX port.
Power LED
green
Indicates that
the power
supply to the
hub is present.
Collision LED
yellow
Flashes each time a
collision is detected
at the hub. Collisions
are part of normal
network operation.
Network Utilization LEDs
green/yellow/orange
Indicates how much your
network is being used.
Port Status LEDs
green/yellow
Indicates the status of each port. If
nothing is connected, the LED is off.
If green, the link between the port
and the next piece of network
equipment is OK.
If yellow, the port has partitioned due
to a fault on that segment.
3C16721.book Page 8 Wednesday, July 7, 1999 3:05 PM

9
Fast Ethernet Hub 12—Rear
12
6X
7X
1X
POWER
Power adapter socket
Only use the power adapter that is
supplied with this OfficeConnect
hub. Do not use any other adapter.
Uplink/Normal switch
Affects the operation of the highest numbered
port (port 12). For connecting the port to a
workstation, set to Normal (out).
For connecting the port to another
OfficeConnect unit, set to Uplink (in). Refer to
the “Connecting OfficeConnect Hubs
Together” section.
100BASE-TX RJ-45 ports
Use 100BASE-TX cable with RJ-45 connectors.
You can connect the OfficeConnect hub to any
workstation or piece of equipment that has a
100BASE-TX port. The highest numbered port
can be used to link to another OfficeConnect
unit. Refer to the “Connecting OfficeConnect
Hubs Together” section.
Uplink/Normal
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10
Before You Start
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
■A stacking clip
■Two unit labels and eight cable ties.
■An OfficeConnect Network Assistant CD-ROM.
The extra parts mentioned in the next section are not
supplied with the hub.
Workstation Connections
To connect workstations or other equipment to your hub,
you need:
1A 100BASE-TX adapter card for
each workstation. 3Com
produce a range of easy to
install network adapter cards,
which provide your
workstations with 100BASE-T
connections.
2An operating system (for example, Netware or Windows
95/98) with network support configured, running on
your workstations.
3One ‘Straight-through’ 100BASE-TX cable for each
workstation or piece of equipment. A ‘Straight-through’
cable is one where the pins of one connector are
connected to the same pins of the other connector; refer
to Figure 5 on page 16. 100BASE-TX cable must be data
grade (Category 5) shielded or unshielded. We
recommend that you use shielded cable. The maximum
length you can use is 100m (328ft).
In order to comply with the 100BASE-TX standard,
ports designed for workstation connections have been
marked with the graphical symbol ‘x’ (1x, 2x, 3x, ...).
This denotes a crossover in the port’s internal wiring.
Hub Connections
To connect to another OfficeConnect hub, you need:
■One ‘Straight-through’ 100BASE-TX cable. The maximum
length is 100m (328ft). Refer to “Connecting
OfficeConnect Hubs Together” on page 13.
3
2
1
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11
Stacking the Units Together
The Rubber Feet
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.
The Stacking Clip
The blue stacking clip allows you to stack your
OfficeConnect units together neatly and securely.
CAUTION: You can stack up to a maximum of four
units. Smaller units must be stacked above larger
units.
To fit the clip:
1Place your unit on a flat surface.
2Fit the clip across the top of the unit, as shown in
Figure 2 (picture 1), ensuring that the longer sections of
the fastening pieces are pointing downwards.
3Align the fastening pieces over the slots found on each
side of the unit.
4Push the clip down gently to secure it, ensuring the
fastening pieces snap into the slots on the unit.
To fit another unit:
1Rest the second unit on top of the clip and align it with
the front of the unit below.
2Press 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 2 (picture 2).
Figure 2 Stacking Your Units Together
To remove the clip:
1Remove 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.
2Push the clip in the center, so it bends towards the base
of the unit, and then separate once the clip is loose.
1
Fastening
Piece
2
Fastening
Piece
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12
Positioning Your OfficeConnect Hub
When installing your OfficeConnect hub, ensure:
■It is out of direct sunlight and away from sources of
heat.
■Cabling is away from power lines, fluorescent lighting
fixtures, and sources of electrical noise such as radios,
transmitters and broadband amplifiers.
■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 25.4 mm (1in.) clearance.
Securing Your 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.
When wall mounting the unit, ensure that it is within
reach of the power outlet.
For Hub 4 or Hub 8: Make two screw holes 150mm
(5.9in.) apart. Use the guide at the back of this manual to
mark the position of the holes.
For Hub 12: Make two screw holes 142mm (5.6in.) apart.
Use the guide at the at the back of this manual to mark the
position of the holes.
Fix the screws into the wall, leaving their heads 3mm
(0.12in.) clear of the wall surface.
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.
CAUTION:Only wall mount single units, do not wall
mount stacked units.
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.
3C16721.book Page 12 Wednesday, July 7, 1999 3:05 PM

13
Connecting Workstations and Other
Equipment to Your Hub
WARNING: Please read the ‘Important Safety
Information’ section before you start.
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 workstations and other equipment to your hub
is easy. Connect them using 100BASE-TX cables to any of
the hub’s 100BASE-TX RJ-45 ports. To connect a
100BASE-TX 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.
The hub detects all port connections, so you can start using
your network immediately. When you need more ports,
simply add more OfficeConnect hubs.
If you are using the highest-number port (port 4 on
Hub 4, port 8 on Hub 8, port 12 on Hub 12) to
connect a workstation, ensure the Uplink/Normal
switch is set to Normal (out).
Connecting OfficeConnect Hubs Together
You can increase the number of workstations that can
connect to your network by adding another OfficeConnect
hub.
You can directly connect together a maximum of two
Fast Ethernet hubs. The total length of cable (A + B +
C below) between two workstations, or between a
workstation and a non-repeater piece of equipment
(such as a switch), must not exceed 205m (672ft).
Each cable (A, B or C) must not exceed 100m (328ft).
3Com recommends that the cable (B) between the
Fast Ethernet hubs is no longer than 5m (16.4ft). This
allows the maximum hub to workstation cable length
(A or C) of 100m (328ft) to be used, as in Figure 3.
Figure 3 Configuration Rules and Example of a Fast Ethernet
Network
BC
A
Example: 100m (328ft)
100m
(328ft)
5m (16.4ft) 100m (328ft)
Hub Hub
Workstation Workstation
Switch
3C16721.book Page 13 Wednesday, July 7, 1999 3:05 PM

14
Connecting 100BASE-TX Hubs
You can connect two OfficeConnect hubs together, as seen
in Figure 4, with 100BASE-TX in a number of ways, but for
simplicity we recommend the following method:
1Connect the highest-number port (port 4 on Hub 4,
port 8 on Hub 8, port 12 on Hub 12) of the lower hub
to any port of the upper hub.
2Set the Uplink/Normal switch on the lower hub to Uplink
(in). If you use the highest-number port of the upper hub
ensure that its Uplink/Normal Switch is set to Normal.
Figure 4 Correct Hub Connections Using 100BASE-TX
Connecting to 10BASE-T Networks
Your OfficeConnect Hub can be connected to a 10BASE-T
network through an OfficeConnect switch (for example, an
OfficeConnect Dual Speed Switch 8).
Checking Hub Connections
When you have connected your hubs, power them on. The
Port Status LEDs for the ports you have used on the hubs
should be green. If they are not, check your connections
and the settings of the Uplink/Normal switches.
Spot Checks
At frequent intervals, visually check that:
■The Alert LED is off — this is the best way to find out if
there are problems with your network.
■Case vents are not obstructed.
■Cabling is secure and not pulled taut.
81X
1X
Uplink/Normal
Switch set to
Uplink (in)
Switch set to
Normal (out)
100BASE-TX cable
with RJ-45 connectors
POWER
POWER Uplink/Normal
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15
PROBLEM SOLVING
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
100BASE-TX 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 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 Uplink/Normal 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.
3C16721.book Page 15 Wednesday, July 7, 1999 3:05 PM

16
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 only be directly
connected to equipment that can provide a 100Mbps
connection (not 10Mbps only). In particular, ensure that:
■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.
■Any 10Mbps equipment that you want to link to the
hub, is connected through a 10/100 hub or switch.
■You are using a ‘Straight-through’ 100BASE-TX cable that
is properly connected at both ends, and is not damaged.
Refer to Figure 5 to compare the wiring of a
straight-through and a crossover cable.
Figure 5 Straight-through Cable/Crossover Cable
1
Normal
port Pin Pin Uplink port
Rx+
Rx-
Tx+
Tx-
Rx-
Rx+
Tx-
Tx+
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
Normal
port Pin Pin Normal port
Rx+
Rx-
Tx+
Tx-
Rx+
Rx-
Tx+
Tx-
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
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17
NETWORKING T
ERMINOLOGY
A Network is a collection of workstations (for example,
IBM-compatible PCs) and other equipment (for example,
printers), connected for the purpose of exchanging
information or sharing resources. Networks vary in size,
some are within a single room, others span continents.
A Local Area Network (LAN) is a network, usually in an
office, that spans no more than a single site.
Ethernet is a type of LAN, referring to the technology used
to pass information around the network.
Fast Ethernet is a type of LAN that runs ten times faster
than standard Ethernet.
10BASE-T is the name given to the Ethernet protocol that
runs over Twisted Pair (TP) cable at 10Mbps.
100BASE-TX is the name given to the Fast Ethernet
protocol that runs over Twisted Pair (TP) cable at
100Mbps. The OfficeConnect hub uses RJ-45 type
connectors for connecting your TP network
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.
A segment is the length of cable connected to a port,
whether this cable is 10BASE-T, 100BASE-TX, or another
type.
Packets are the units of information your workstations and
other equipment send to each other over the network.
Collisions are a part of normal Fast 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.
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18
DIMENSIONS AND STANDARDS
Dimensions and Operating Conditions
OfficeConnect Fast Ethernet Hub 4
OfficeConnect Fast Ethernet Hub 8
OfficeConnect Fast Ethernet Hub 12
500g (1.1lb)
225mm (9in.)
0 to 40°C (32 to 105°F)
operating
temperature
4 VA
14 BThU/hr
power
0 to 90%
(non-condensing)
humidity
35.8mm
(1.4in.)
135.4mm (5.3in.)
550g (1.2lb)
225mm (9in.)
0 to 40°C (32 to 105°F)
operating
temperature
9 VA
31 BThU/hr
power
0 to 90%
(non-condensing)
humidity
35.8mm
(1.4in.)
135.4mm (5.3in.)
950g (2.1lb)
228mm (9.12in.)
54.6mm
(2.1in.)
185.4mm (7.3in.)
0 to 40°C (32 to 105°F)
operating
temperature
12 VA
40 BThU/hr
power requirement
0 to 90%
(non-condensing)
humidity
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19
Standards
Functional: ISO 8802/3
IEEE 802.3
Safety: UL 1950, EN 60950
CSA 22.2 #950
IEC 950
EMC: EN 55022 Class B†
EN 50082-1
FCC Part 15 Class B†*
ICES-003 Class B
VCCI Class B†
CNS 13438 Class A
Environmental: EN 60068 (IEC 68)
†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 32 for
conditions of operation.
3C16721.book Page 19 Wednesday, July 7, 1999 3:05 PM

20
ENVIRONMENTAL STATEMENTS
It is the policy of 3Com Corporation to be
environmentally-friendly in all operations. To uphold our
policy, we are committed to:
■Establishing environmental performance standards that
comply with national legislation and regulations.
■Conserving energy, materials and natural resources in all
operations.
■Reducing the waste generated by all operations.
■Ensuring that all waste conforms to recognized
environmental standards.
■Maximizing the recyclable and reusable content of all
products.
■Ensuring that all products can be recycled, reused and
disposed of safely.
■Ensuring that all products are labelled according to
recognized environmental standards.
■Improving our environmental record on a continual basis.
End Of Life Statement
3Com processes allow for the recovery, reclamation and safe
disposal of all end-of-life electronic components.
Regulated Materials Statement
3Com products do not contain any hazardous or
ozone-depleting material.
Environmental Statement about the Documentation
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 Statement about the Product
Packaging
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.
3C16721.book Page 20 Wednesday, July 7, 1999 3:05 PM