OFFICECONNECT® DUAL SPEED HUB 16

3C16751
USER GUIDE

Part No.
DUA1675-1AAA01

Published
August 1998

INTRODUCTION
Welcome to the world of networking with 3Com® .
In the modern business environment, communication
and sharing information are crucial. Computer
networks have proved to be one of the fastest modes
of communication. The OfficeConnect® product
range from 3Com brings the power of computer
networks to the small office.
The OfficeConnect Dual Speed Hub 16 is an
easy-to-use Class II hub (repeater) with 16
10/100BASE-TX ports. It allows you to set up a
network with both Ethernet (10Mbps) and Fast
Ethernet (100Mbps) workstations and other devices
(a Class II hub can be connected to another Fast
Ethernet hub, a Class I hub cannot). Small Network with OfficeConnect Dual Speed Hub 16

When referring to the OfficeConnect Dual Speed The Hub is ideal for use with other OfficeConnect
Hub 16, this guide uses the term ‘Hub’. products. The OfficeConnect product range is
Each port on the Hub can be connected to either a compact and attractively designed for desktop use,
10BASE-T (Ethernet) or a 100BASE-TX (Fast Ethernet) and neatly stacks together with clips. For further
device. The port senses the speed of the connected information, refer to the “OfficeConnect Product
equipment and operates at the appropriate speed. Range” sheet that accompanies the Hub.

If you wish to extend an existing Ethernet network This guide helps you get the most out of your Hub.
into Fast Ethernet, adding a Dual Speed Hub 16 can
offer a more cost-effective migration path than
adding both a 100Mbps hub and a 10/100Mbps
switch.
1
 CREATING YOUR NETWORK

A Network Loop occurs when two pieces of network

Networking Terminology equipment are connected by more than one path.

A Network is a collection of workstations (for example, A Segment is the length of cable connected to a port.
IBM-compatible PCs) and other equipment (for Packets are the units of information your workstations and
example, printers), connected for the purpose of other equipment send to each other over the
exchanging information or sharing resources. network. A Frame is the data part of the packet and
Networks vary in size; some are within a single room, can be Unicast (sent to a single device), Multicast
others span continents. (sent to multiple devices), or Broadcast (sent to all
A Local Area Network (LAN) is a network, usually in an devices).
office, that spans no more than a single site. Bandwidth refers to the amount of network traffic the
Ethernet is a type of LAN, referring to the technology used network can hold at any one time (information
to pass information around the network. It operates capacity) measured in bits per second (bps).
at 10Mbps (megabits per second). Workstations or applications that use the network
heavily are referred to as using high bandwidth (these
Fast Ethernet is a type of LAN that runs up to 10 times are usually users who do a lot of graphical or
faster than standard Ethernet. It operates at multi-media work across the network). Fast Ethernet
100Mbps. has a higher bandwidth than Ethernet, so it can cope
10BASE-T is the name given to the Ethernet protocol that with larger amounts of traffic, which results in faster
runs over Twisted Pair (TP) cable at 10Mbps. operation.
100BASE-TX is the name given to the Fast Ethernet protocol In a Half Duplex link, information can flow in either
that runs over Twisted Pair (TP) cable at 100Mbps. direction, but not in both directions simultaneously.

2
Before You Start Using the Rubber Feet and Stacking Clips
Your OfficeConnect Dual Speed Hub 16 comes with: The four self-adhesive rubber feet prevent your Hub
from sliding around on your desk. Stick the feet to

One power adapter for use with the Hub
the marked areas at each corner of the underside of

One power cord your Hub.

A Warranty Registration card for you to fill out and
The four stacking clips are used for neatly and
return
securely stacking your OfficeConnect units together.

Four rubber feet You can stack up to four units. Small units must

Four stacking clips be stacked above large units. To stack your units,
secure the clips on one side and then on the other.

An OfficeConnect Product Range sheet
Use the following method to secure one side:

An OfficeConnect Network Assistant CD-ROM

This guide 1 Place your new unit
on a flat surface.
Workstation Connections Your clips fit in these
To connect workstations or other equipment (such as positions on the side
servers) to your Hub, you need: of the unit:

1 One 10BASE-T,
10/100BASE-TX, or
100BASE-TX adapter card
for each workstation.
3Com produce a range of
easy to install network
adapters, which provide
your workstation with a
suitable connection.
2 One suitable TP cable for each workstation.
In order to comply with the 10BASE-T standard, ports
designed for workstation connections have been 2 Position a clip over
marked with the graphical symbol ‘X’. This denotes a one of these holes and
crossover in the port’s internal wiring, for example push it in until it clicks
1X, 2X, 3X... into place. Repeat this
for the other clip
You also need a network operating system running
position on the same
on your workstations.
side.
Twisted Pair (TP) Cables
To connect your workstations and other equipment to 3 Keeping the front of
the Hub, use ‘straight-through’ TP cables with RJ45 the units aligned, rest
connectors (all OfficeConnect products use RJ45 type the bottom of the
connectors). A ‘straight-through’ cable is one where existing unit on the
each pin of one connector is connected to the same clips’ spikes. Push the
pin of the other connector. clips firmly into the
existing unit until they
Cables can be shielded (screened) or unshielded; we click into place.
recommend that you use shielded cable. Cables used
for 100BASE-TX or 10/100BASE-TX connections must
be data grade (Category 5).
Repeat these steps to secure the other side.
Your supplier should stock suitable cables.
To remove a clip, hold the units firmly with one hand
The maximum length of a single cable is 100m and hook the first finger of your other hand around
(328ft). Refer to “Fast Ethernet (100Mbps) the back of the clip. Use reasonable force to pull it off.
Configuration Rules” on page 5 for further
information on cable lengths in a 100Mbps network.

Hub Connections
To connect other OfficeConnect units to your Hub,
you need one suitable TP cable for each unit.

3
Positioning Your OfficeConnect Hub Connecting Workstations and Other
Equipment to Your Hub
When installing your Hub, ensure:

It is out of direct sunlight and away from sources of WARNING: Please read the ‘Important Safety
heat. Information‘ section carefully before you install or
remove the unit.

Cabling is away from power lines, fluorescent lighting
fixtures, and sources of electrical noise such as radios, WARNHINWEIS: Bitte lesen Sie den Abschnitt
transmitters and broadband amplifiers. ‘Wichtige Sicherheitsinformationen’ sorgfältig durch,
bevor Sie das Gerät installieren oder ausbauen.

Water or moisture cannot enter the case of the unit.
AVERTISSEMENT: Veuillez lire attentivement la

Air flow around the unit and through the vents in the
section “Consignes importantes de sécurité” avant
side of the case is not restricted. We recommend you
d’installer ou de retirer l’appareil.
provide a minimum of 25mm (1in.) clearance.
CAUTION: The equipment connected to the Hub
must be set to operate in auto-negotiate or half
Wall Mounting the OfficeConnect Hub duplex mode.

CAUTION: Only wall mount single units. Do not wall Connecting workstations and other equipment to
mount stacked units. your Hub is easy. To connect a workstation to any of
the Hub’s ports, use a ‘straight-through’ TP cable.
There are two slots on the underside of the Hub Refer to “Twisted Pair (TP) Cables” on page 3 for
which are used for wall mounting. You can mount further information.
the unit with the LEDs facing upwards or downwards,
to suit your needs. If you are using port 16 to connect a workstation,
ensure the MDI/MDIX switch is set to MDIX (out).
When wall mounting the unit, ensure that it is within
reach of the power outlet. TP cables are very easy to use. To connect a cable,
simply slot the connector into the appropriate RJ45
You need two suitable screws. Ensure that the wall
port. When the connector is fully in, its latch locks it
you are going to use is smooth, flat, dry and sturdy.
in place. To disconnect the cable, push the
Make two screw holes which are 142mm (5.6in.)
connector’s latch in and remove it.
apart. Use the guide at the top of this page to mark
the position of the holes. Fix the screws into the wall, The Hub detects all port connections, so you can start
leaving their heads 3mm (0.12in.) clear of the wall using your network immediately. If you need more
surface. ports, simply add another OfficeConnect hub.
Remove any connections to the unit and locate it
over the screw heads. When in line, gently push the
unit on to the wall and move it downwards to
secure. When making connections, be careful not to
push the unit up and off the wall.

4
 Making the Connection to Another Hub
Connecting Another OfficeConnect Hub You can connect a 10BASE-T, 100BASE-TX, or
You may wish to connect another OfficeConnect hub another 10/100BASE-TX OfficeConnect hub to any
to your Dual Speed Hub 16. Alternatively, you may port on the Dual Speed Hub 16. Use the following
wish to add your Hub to an existing 10Mbps method:
network. When extending your network, you should 1 Using a straight-through cable, connect the
be aware of the configuration rules given below. MDI/MDIX port of the Dual Speed Hub 16 to any of
If you connect two Dual Speed Hub 16 units directly the ports on the other hub (as shown in the diagram
together, the link between them operates at 100Mbps. below). If using an MDI/MDIX port on the other hub,
set its MDI/MDIX switch to MDIX (out).
Fast Ethernet (100Mbps) Configuration Rules 2 Set the MDI/MDIX switch for the MDI/MDIX port on
The Dual Speed Hub 16 is a Class II hub. You can the Dual Speed Hub 16 to MDI (in).
connect directly two Class II Fast Ethernet hubs
(Class I Fast Ethernet hubs cannot be connected
directly to other 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 shown
in the example.

Correct Connections for OfficeConnect Hubs

Powering Up and Checking Connections

When you have connected all the appropriate
workstations and other equipment to the Hub, power
on the Hub. For each port with a connection, the
corresponding Port Status LED should be on. If the
LED is off, check your connections.
Configuration Rules and Example of a Fast Ethernet (100Mbps) Network
CAUTION: Do not power the Hub off and on quickly.
Ethernet (10Mbps) Configuration Rules Wait about 5 seconds between power cycles.
You can connect a maximum of four Ethernet
(10Mbps) hubs in series between workstations, or
between a workstation and a non-repeater piece of Spot Checks
equipment (such as a switch). Each cable must not
exceed 100m (328ft). An example is shown below. 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

If you suspect a problem, refer to “Problem Solving”

on page 7.

Example of Ethernet (10Mbps) Network

5
 IMPORTANT SAFETY INFORMATION
WARNING: Warnings contain directions that you must follow for your WARNING: RJ45 ports. These are shielded RJ45 data sockets. They cannot be
personal safety. Follow all directions carefully. used as telephone sockets. Only connect RJ45 data connectors to these
You must read the following safety information carefully before you install or sockets.
remove the unit:
Power Cord Set:

Exceptional care must be taken during installation and removal of the unit. This must be approved for the country where it is used:

Only stack the OfficeConnect unit with other OfficeConnect units. USA and The cord set must be UL-approved and CSA certified.

To ensure compliance with international safety standards, only use the power Canada The minimum specification for the flexible cord is:
adapter that is supplied with the unit. No. 18 AWG

The socket outlet must be near to the unit and easily accessible. You can only Type SV or SJ
remove power from the unit by disconnecting the power cord from the outlet. 3-conductor

This unit operates under SELV (Safety Extra Low Voltage) conditions according The cord set must have a rated current capacity of at least
to IEC 950. The conditions are only maintained if the equipment to which it is 10A.
connected also operates under SELV conditions. The attachment plug must be an earth-grounding type

There are no user-replaceable fuses or user-serviceable parts inside the unit. If with a NEMA 5-15P (15A, 125V) or NEMA 6-15P (15A,
you have a physical problem with the unit that cannot be solved with problem 250V) configuration.
solving actions in this guide, contact your supplier. Denmark The supply plug must comply with section 107-2-D1,

Disconnect the power adapter before removing the unit. standard DK2-1a or DK2-5a.
Switzerland The supply plug must comply with SEV/ASE 1011.

WICHTIGE SICHERHEITSINFORMATIONEN
WARNHINWEIS: Warnhinweise enthalten Anweisungen, die Sie zu Ihrer
Der Betrieb dieses Geräts erfolgt unter den SELV-Bedingungen
eigenen Sicherheit befolgen müssen. Alle Anweisungen sind sorgfältig zu (Sicherheitskleinstspannung) gemäß IEC 950. Diese Bedingungen sind nur
befolgen. gegeben, wenn auch die an das Gerät angeschlossenen Geräte unter
Sie müssen die folgenden Sicherheitsinformationen sorgfältig durchlesen, bevor SELV-Bedingungen betrieben werden.
Sie das Gerät installieren oder ausbauen:
Es sind keine von dem Benutzer zu ersetzende oder zu wartende Teile in dem

Bei der Installation und beim Ausbau des Geräts ist mit höchster Vorsicht Gerät vorhanden. Wenn Sie ein Problem mit dem Gerät haben, das nicht
vorzugehen. mittels der Fehleranalyse in dieser Anleitung behoben werden kann, setzen Sie

Stapeln Sie das Gerät nur mit anderen OfficeConnect Gerätes zusammen. sich mit Ihrem Lieferanten in Verbindung.

Aufgrund von internationalen Sicherheitsnormen darf das Gerät nur mit dem
Vor dem Ausbau des Geräts das Netzadapterkabel herausziehen.
mitgelieferten Netzadapter verwendet werden. WARNHINWEIS: RJ45-Anschlüsse. Dies sind abgeschirmte

Die Netzsteckdose muß in der Nähe des Geräts und leicht zugänglich sein. Die RJ45-Datenbuchsen. Sie können nicht als Telefonanschlußbuchsen verwendet
Stromversorgung des Geräts kann nur durch Herausziehen des werden. An diesen Buchsen dürfen nur RJ45-Datenstecker angeschlossen
Gerätenetzkabels aus der Netzsteckdose unterbrochen werden. werden.

CONSIGNES IMPORTANTES DE SÉCURITÉ

AVERTISSEMENT: Les avertissements présentent des consignes que vous AVERTISSEMENT: Ports RJ45. Il s'agit de prises femelles blindées de données
devez respecter pour garantir votre sécurité personnelle. Vous devez respecter RJ45. Vous ne pouvez pas les utiliser comme prise de téléphone. Branchez
attentivement toutes les consignes. uniquement des connecteurs de données RJ45 sur ces prises femelles.
Nous vous demandons de lire attentivement les consignes suivantes de sécurité
Cordon électrique:
avant d’installer ou de retirer l’appareil: Il doit être agréé dans le pays d'utilisation:

Faites très attention lors de l'installation et de la dépose du groupe.
Etats-Unis et Le cordon doit avoir reçu l'homologation des UL et un

Seulement entasser l’appareil avec les autres appareils OfficeConnect. Canada certificat de la CSA.

Pour garantir le respect des normes internationales de sécurité, utilisez Le cordon souple doit respecter, à titre minimum, les
uniquement l'adaptateur électrique remis avec cet appareil. spécifications suivantes:

La prise secteur doit se trouver à proximité de l’appareil et son accès doit être calibre 18 AWG
facile. Vous ne pouvez mettre l’appareil hors circuit qu'en débranchant son type SV ou 5J
cordon électrique au niveau de cette prise. à 3 conducteurs

L’appareil fonctionne à une tension extrêmement basse de sécurité qui est Le cordon doit être en mesure d'acheminer un courant
conforme à la norme CEI 950. Ces conditions ne sont maintenues que si nominal d'au moins 10 A.
l'équipement auquel il est raccordé fonctionne dans les mêmes conditions. La prise femelle de branchement doit être du type à mise à

Il n’y a pas de parties remplaceables par les utilisateurs ou entretenues par les la terre (mise à la masse) et respecter la configuration
utilisateurs à l’intérieur de l’appareil. Si vous avez un problème physique avec NEMA 5-15P (15 A, 125 V) ou NEMA 6-15P (15 A, 250 V).
l’appareil qui ne peut pas être résolu avec les actions de la résolution des
problèmes dans ce guide, contactez votre fournisseur.

Débranchez l'adaptateur électrique avant de retirer cet appareil.

3Com Corporation, 5400 Bayfront Plaza, Santa Clara, California, 95052-8145, U.S.A.
© 3Com Technologies, 1998. 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
permission from 3Com Technologies. 3Com Technologies reserves the right to revise this documentation and to make 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 of any kind, either imp lied or expressed, including, but not limited to, the implied warranties of merchantability 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.
UNITED STATES GOVERNMENT LEGENDS:
If you are a United States government agency, then this documentation and the software described herein are provided to you subject to the following restricted rights:

For units of the Department of Defense: Restricted Rights Legend: Use, duplication or disclosure by the Government is subject to restrictions as set forth in subparagraph (c) (1) (ii) for restricted Rights in Technical Data and
Computer Software clause at 48 C.F.R. 52.227-7013. 3Com Centre, Boundary Way, Maylands Park South, Hemel Hempstead, Herts, HP2 7YU, U.K.

For civilian agencies: Restricted Rights Legend: Use, reproduction or disclosure is subject to restrictions set forth in subparagraph (a) through (d) of the Commercial Computer Software - Restricted Rights Clause at 48 C.F.R.
52.227-19 and the limitations set forth in 3Com Corporation’s standard commercial agreement for the software. Unpublished rights reserved under the copyright laws of the United States.

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. If you are unable to locate a copy, please contact 3Com and a copy will be provided to you.
Unless otherwise indicated, 3Com registered trademarks are registered in the United States and may or may not be registered in other countries.
3Com and OfficeConnect are registered trademarks of 3Com Corporation. Other brand and product names may be registered trademarks or trademarks of their respective holders.

6
 PROBLEM SOLVING
The Hub has been designed to aid you when Port Status LED flashing. The port is partitioned,
detecting and solving possible problems with your probably due to a network loop. Examine your
network. These problems are rarely serious; the cause connections and remove the loop. Each piece of
is usually a disconnected or damaged cable, or equipment needs only one connection to your Hub.
incorrect configuration. If this section does not solve
your problem, contact your supplier for information Link between the Hub and another
on what to do next. OfficeConnect hub not working. Check your
connections; follow the information given in the
Perform these actions first: “Connecting Another OfficeConnect Hub” section on
page 5. It is likely that an MDI/MDIX switch is

Ensure all network equipment is powered on.
incorrectly set.

Power each piece of network equipment off, wait
about 5 seconds and then power each one on. Alert LED continuously lit. There is a problem with
the network. Check the Port Status LEDs to try to
Check the following symptoms and solutions:
identify the port that is causing the problem. If one
Power LED not lit. Check your power adapter of the Port Status LEDs is flashing, that port has
connection. If there is still no power, you may have a partitioned, probably due to a network loop. Examine
faulty power adapter which needs replacing with an your connections and remove the loop. Each piece of
identical OfficeConnect power adapter. Do not use equipment needs only one connection to your Hub.
any other power adapter with the Hub. If you cannot identify such a port, remove the port
connections one at a time, waiting a few seconds
Port Status LED not lit for a port that has a
between each port. If the Alert LED goes off, there is
connection. Check that you are using a
either a network loop (see above), or an excessive
‘straight-through’ cable which is properly connected
amount of traffic on that port connection. Check the
at both ends, and is not damaged. Refer to “Twisted
Network Utilization LEDs to see if the network is
Pair (TP) Cables” on page 3. Also check that the
heavily loaded (over 80%). Some pieces of network
equipment connected to the Hub is powered on,
equipment operate by sending out frames regularly.
operating correctly and contains the correct type of
Refer to the documentation that accompanies the
connection.
piece of network equipment.
Port Status LED lit yellow for a port with a If the Alert LED is still lit after removing all of your
100Mbps device connected. This may be because connections, there may be a problem with your Hub.
the cable is not of a high enough quality to carry Fast Power it off, wait about 5 seconds and then power it
Ethernet signals (we recommend you use a on. If the Alert LED comes back on continuously,
Category 5 cable), or due to a problem with the contact your supplier.
network card (NIC) of the attached equipment.

DIMENSIONS AND STANDARDS

Dimensions and Operating Conditions Standards
Functional: ISO 8802/3
IEEE 802.3, 802.3u

Safety: UL 1950, EN 60950

CSA 22.2 #950, IEC 950

Emissions: EN 55022 Class B*

FCC Part 15 Class B*
ICES-003 Class B*
VCCI Class B*
AS/NZS 3548 Class B*
EN50082-1
CNS 13438 Class A
OfficeConnect Dual Speed Hub 16
* Screened (shielded) cables must be used to ensure
compliance with these EMC standards. Refer to “EMC
Statements” on page 8 for conditions of operation.

Environmental: EN 60068 (IEC 68)

Acoustic Noise: ISO 7779

ISO 9295
7
 EMC STATEMENTS
FCC STATEMENT: This equipment has been tested and found Cet appareil numérique de la classe B respecte toutes les
to comply with the limits for a Class B digital device, pursuant exigences du Règlement sur le matériel brouilleur du Canada.
to part 15 of the FCC rules. 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. If this equipment does cause harmful 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: The user may find the following booklet prepared by the

Reorient or relocate the receiving antenna. Federal Communications Commission helpful:

Increase the separation between the equipment and the receiver. ‘ How to Identify and Resolve Radio-TV Interference Problems’

Connect the equipment into an outlet on a circuit different from
This booklet is available from the U.S. Government Printing
that to which the receiver is connected.
Office, Washington, DC 20402, Stock No. 004-000-00345-4.

Consult the dealer or an experienced radio/TV technician for help.
In order to meet FCC emissions limits, this equipment must be
CSA STATEMENT: This Class B digital apparatus meets all
used only with cables which comply with IEEE 802.3.
requirements of the Canadian Interference-Causing Equipment
Regulations.

LIFETIME LIMITED WARRANTY

The duration of the warranty for the OfficeConnect Dual Speed Hub 16 (3C16751) is lifetime, during the applicable warranty period. Standard warranty service for software products may
including the power supply, but excluding the fan, which has one (1) year warranty. be obtained by telephoning 3Com's Corporate Service Center or an Authorized 3Com Service
Center, within the warranty period. Products returned to 3Com's Corporate Service Center
Advance hardware exchange is available during the first year from your date of purchase in
must be pre-authorized by 3Com with a Return Material Authorization (RMA) number marked
accordance with 3Com’s standard terms and conditions for such service. After the first year,
on the outside of the package, and sent prepaid, insured, and packaged appropriately for
the warranty reverts to 3Com’s standard lifetime limited warranty.
safe shipment. The repaired or replaced item will be shipped to Customer, at 3Com's
To qualify for the lifetime limited warranty and the advance hardware exchange, you must expense, not later than thirty (30) days after receipt of the defective product by 3Com.
submit the appropriate product warranty registration card to 3Com, otherwise this product
WARRANTIES EXCLUSIVE: IF A 3COM PRODUCT DOES NOT OPERATE AS WARRANTED
will be warranted for a period of one (1) year without advance hardware exchange. ABOVE, CUSTOMER'S SOLE REMEDY FOR BREACH OF THAT WARRANTY SHALL BE REPAIR,
HARDWARE: 3Com warrants its hardware products to be free from defects in workmanship REPLACEMENT, OR REFUND OF THE PURCHASE PRICE PAID, AT 3COM'S OPTION. TO THE
and materials, under normal use and service, for the following lengths of time from the date FULL EXTENT ALLOWED BY LAW, THE FOREGOING WARRANTIES AND REMEDIES ARE
of purchase from 3Com or its Authorized Reseller: 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,
Network adaptersLifetime INCLUDING WARRANTIES, TERMS, OR CONDITIONS OF MERCHANTABILITY, FITNESS FOR A
Other hardware productsOne year (unless otherwise specified above) PARTICULAR PURPOSE, AND SATISFACTORY QUALITY. 3COM NEITHER ASSUMES NOR
AUTHORIZES ANY OTHER PERSON TO ASSUME FOR IT ANY OTHER LIABILITY IN
Spare parts and spares kits90 days CONNECTION WITH THE SALE, INSTALLATION, MAINTENANCE OR USE OF ITS PRODUCTS.
If a product does not operate as warranted above during the applicable warranty period, 3COM SHALL NOT BE LIABLE UNDER THIS WARRANTY IF ITS TESTING AND EXAMINATION
3Com shall, at its option and expense, repair the defective product or part, deliver to DISCLOSE THAT THE ALLEGED DEFECT IN THE PRODUCT DOES NOT EXIST OR WAS CAUSED
Customer an equivalent product or part to replace the defective item, or refund to Customer BY CUSTOMER'S OR ANY THIRD PERSON'S MISUSE, NEGLECT, IMPROPER INSTALLATION OR
the purchase price paid for the defective product. All products that are replaced will become TESTING, UNAUTHORIZED ATTEMPTS TO REPAIR OR MODIFY, OR ANY OTHER CAUSE
the property of 3Com. Replacement products may be new or reconditioned. Any replaced or BEYOND THE RANGE OF THE INTENDED USE, OR BY ACCIDENT, FIRE, LIGHTNING, OR OTHER
repaired product or part has a ninety (90) day warranty or the remainder of the initial HAZARD.
warranty period, whichever is longer.
LIMITATION OF LIABILITY. TO THE FULL EXTENT ALLOWED BY LAW 3COM ALSO
3Com shall not be responsible for any software, firmware, information, or memory data of EXCLUDES FOR ITSELF AND ITS SUPPLIERS ANY LIABILITY, WHETHER BASED IN CONTRACT OR
Customer contained in, stored on, or integrated with any products returned to 3Com for TORT (INCLUDING NEGLIGENCE), FOR INCIDENTAL, CONSEQUENTIAL, INDIRECT, SPECIAL, OR
repair, whether under warranty or not. PUNITIVE DAMAGES OF ANY KIND, OR FOR LOSS OF REVENUE OR PROFITS, LOSS OF
SOFTWARE: 3Com warrants that the software programs licensed from it will perform in BUSINESS, LOSS OF INFORMATION OR DATA, OR OTHER FINANCIAL LOSS ARISING OUT OF
substantial conformance to the program specifications therefor for a period of ninety (90) OR IN CONNECTION WITH THE SALE, INSTALLATION, MAINTENANCE, USE, PERFORMANCE,
days from the date of purchase from 3Com or its Authorized Reseller. 3Com warrants the FAILURE, OR INTERRUPTION OF ITS PRODUCTS, EVEN IF 3COM OR ITS AUTHORIZED RESELLER
media containing software against failure during the warranty period. No updates are HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES, AND LIMITS ITS LIABILITY TO
provided. 3Com's sole obligation with respect to this express warranty shall be (at 3Com's REPAIR, REPLACEMENT, OR REFUND OF THE PURCHASE PRICE PAID, AT 3COM'S OPTION.
discretion) to refund the purchase price paid by Customer for any defective software THIS DISCLAIMER OF LIABILITY FOR DAMAGES WILL NOT BE AFFECTED IF ANY REMEDY
products, or to replace any defective media with software which substantially conforms to PROVIDED HEREIN SHALL FAIL OF ITS ESSENTIAL PURPOSE.
3Com's applicable published specifications. Customer assumes responsibility for the selection Some countries, states, or provinces do not allow the exclusion or limitation of implied
of the appropriate applications program and associated reference materials. 3Com makes no warranties or the limitation of incidental or consequential damages for certain products
warranty or representation that its software products will work in combination with any supplied to consumers or the limitation of liability for personal injury, so the above limitations
hardware or applications software products provided by third parties, that the operation of and exclusions may be limited in their application to you. This warranty gives you specific
the software products will be uninterrupted or error free, or that all defects in the software legal rights which may vary depending on local law.
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 GOVERNING LAW: This Limited Warranty shall be governed by the laws of the state of
provide compatibility, except where the non-compatibility is caused by a "bug" or defect in California.
the third party's product. 3Com Corporation, 5400 Bayfront Plaza, Santa Clara, CA, 95052-8145, U.S.A.
STANDARD WARRANTY SERVICE: Standard warranty service for hardware products may Tel: (408) 326-5000
be obtained by delivering the defective product, accompanied by a copy of the dated proof of 9/1/96
purchase, to 3Com's Corporate Service Center or to an Authorized 3Com Service Center

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: pddtechpubs_comments@3Com.com. Please include the document title
(OfficeConnect Dual Speed Hub 16 User Guide), part number (DUA1675-1AAA01) and, if appropriate, the page number.