3Com Switch 3C16790 User Manual

®
OfficeConnect Dual Speed Sw itch 5,  
Sw itch 8  
User Guide (3C16790, 3C16791)  
 
Introduction  
4
Dimensions and Standards 19  
Dimensions and Operating Conditions 19  
Standards 19  
Creating your Netw ork  
Dual Speed Switch 4Front  
Dual Speed Switch 8 and Dual Speed 16Front  
All UnitsRear  
How the Switch Can Be Used  
Switching  
Connecting 10BASE-T and 100BASE-TX Networks  
Before You Start  
Unit Connections  
4
5
6
Environmental Statements 20  
7
End Of Life Statement 20  
8
Regulated Materials Statement 20  
8
Environmental Statement about the Documentation 20  
Environmental Statement about the Product Packaging 20  
9
9
Important Safety Information 21  
Wichtige Sicherheitshinw eise 22  
Consignes importantes de sécurité 23  
9
Workstation Connections 10  
Twisted Pair (TP) Cables 10  
Stacking the Units Together 11  
The Rubber Feet 11  
Technical Support 24  
The Stacking Clip 11  
Online Technical Services 24  
World Wide Web Site 24  
Positioning Your Switch 12  
Securing Your Switch 12  
3Com Knowledgebase Web Services 24  
Support from Your Network Supplier 25  
Support from 3Com 25  
Connecting Workstations and Other Equipment to Your  
Switch 13  
Connecting OfficeConnect Units to Your Switch 13  
Checking Unit Connections 14  
Spot Checks 14  
Returning Products for Repair 27  
3Com Corporation Limited Warranty 28  
Regulatory Notices 30  
Problem Solving 15  
Netw orking Terminology 17  
3
 
4
 
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.  
Figure 1 Small Network with OfficeConnect Dual Speed Switch  
(Circle Shows Units Clipped Together)  
10BASE-T  
OfficeConnect hub  
As the power of workstations and business applications  
increases, heavier demands are made on the available  
network bandwidth that if unchecked, can lead to  
performance problems in a hub-based setup. Installing the  
OfficeConnect Dual Speed Switch 5 (3C16790) or Switch 8  
(3C16791) allows your network to be segmented so that  
traffic can be contained effectively, reducing the overall load  
without affecting access to critical resources.  
OfficeConnect Switch  
100BASE-TX  
OfficeConnect hub  
This guide will use the term 'Switch' when referring to the  
Dual Speed Switch 5 or Switch 8.  
The Switch is ideal for use with other OfficeConnect  
products, as shown in Figure 1. It is compact and  
attractively designed for desktop use. The Switch is part of  
the OfficeConnect range which neatly stack together with  
the OfficeConnect Stacking Clip.  
The 3C16790 has five 10/100BASE-TX ports while the  
3C16791 has eight 10/100BASE-TX ports. This allows you to  
set up a network with both 10BASE-T and 100BASE-TX  
hubs and workstations.  
4
 
   
CREATING YOUR NETWORK  
Dual Speed Sw itch 5Front  
Alert LED  
If the Alert LED is off, the unit is  
operating correctly.  
After power on, the Alert LED  
remains lit (orange) for a short  
period of time while performing a  
self test. If it is continuously lit there  
may be a problem. Refer to the  
Problem Solvingsection.  
Pow er LED  
If the Pow er LED  
is lit (green), the  
power supply to  
the Switch is  
Port Status and Activity LEDs  
Duplex LEDs  
If the Duplex LED is lit (yellow), the port  
is in full duplex mode. If the LED is off,  
the port is in half duplex mode.  
If the Port Status LED is off there is nothing connected to  
the port, or the connected device is turned off or there may  
be a problem with the connectivity (refer to the Problem  
Solvingsection). If the LED is green the speed of the link to  
the connected device is at 100 Mbps (100BASE-Tx). If the  
LED is yellow the speed of the link to the connected device is  
at 10 Mbps (10BASE-T). The LED will flash to indicate traffic  
is passing through that port.  
present.  
5
 
   
Dual Speed Sw itch 8 Front  
Alert LED  
If the Alert LED is off, the unit is  
operating correctly.  
After power on, the Alert LED  
remains lit (orange) for a short  
period of time while performing a  
self test. If it is continuously lit there  
may be a problem. Refer to the  
Problem Solvingsection.  
Pow er LED  
If the Pow er LED  
is lit (green), the  
power supply to  
the Switch is  
Port Status and Activity LEDs  
Duplex LEDs  
If the Duplex LED is lit (yellow), the port  
is in full duplex mode. If the LED is off,  
the port is in half duplex mode.  
If the Port Status LED is off there is nothing connected to  
the port, or the connected device is turned off or there may  
be a problem with the connectivity (refer to the Problem  
Solvingsection). If the LED is green the speed of the link to  
the connected device is at 100 Mbps (100BASE-Tx). If the  
LED is yellow the speed of the link to the connected device is  
at 10 Mbps (10BASE-T). The LED will flash to indicate traffic  
is passing through that port.  
present.  
6
 
 
Dual Speed Sw itch 8 Rear  
10/100BASE-TX ports  
Pow er Adapter socket  
Use suitable TP cable with RJ-45 connectors. You can connect the  
OfficeConnect Switch to any workstation or OfficeConnect hub that  
has a 10BASE-T, 100BASE-TX or 10/100BASE-TX port. Each port is  
capable of auto-negotiating for 10 Mbps or 100 Mbps operation. All  
ports have an automatic MDI / MDIX feature, it means either a  
'straight through' or 'crossover' UTP cable can be used to connect to  
any port. The switch will automatically detect which wiring practice  
has been followed and will compensate accordingly.  
Only use the power adapter that is  
supplied with this OfficeConnect  
Switch. Do not use any other adapter.  
AVERTISSEMENT: Ports RJ-45.  
WARNING: RJ-45 ports. These are  
shielded RJ-45 data sockets. They  
cannot be used as standard traditional  
telephone sockets, or to connect the  
unit to a traditional PBX or public  
telephone network. Only connect RJ-  
45 data connectors, network  
WARNHINWEIS: RJ-45-Anschlüsse Diese  
Ceux-ci sont protégés par des  
prises de données. Ils ne peuvent  
pas être utilisés comme prises de  
léphone conventionnelles  
standard, ni pour la connection de  
l’unité à un réseau téléphonique  
central privé ou public.  
Porte sind geschützte Datensteckdosen. Sie  
dürfen weder wie normale traditionelle  
Telefonsteckdosen noch für die Verbindung  
der Einheit mit einem traditionellem  
privatem oder öffentlichem Telefonnetzwerk  
gebraucht werden. Nur RJ-45-  
Datenanscluße, Telefonnetzsysteme or  
Netztelefone an diese Steckdosen  
anschließen.  
telephony systems, or network  
telephones to these sockets.  
Either shielded or unshielded data  
cables with shielded or unshielded  
jacks can be connected to these data  
sockets.  
Entweder geschützte oder ungeschützte  
Buchsen dürfen an diese Datensteckdosen  
angeschlossen werden.  
7
 
 
whether it should be directed through the normal or high  
priority channel. This feature can be useful for example  
during excessive loads when one type of traffic may require  
priority over another. The Switch is configured to to comply  
with VLAN priority tagged frames and IP TOS / DSCP priority  
encoded frames.  
How the Sw itch Can Be Used  
Sw itching  
When a network of repeater hubs is in operation, any  
information that is sent by the workstations is passed  
around the whole network (regardless of the destination of  
the information). This can result in a lot of unnecessary  
traffic that can slow the network down. The Switch solves  
this problem because it listensto the network and  
automatically learns what workstations can be reached  
through its ports. It can then selectively pass on any  
information by transmitting the traffic from the relevant port  
only (instead of all ports like a repeater hub). This operation  
is called switching.  
Figure 2 The Switch Separates Your Network and Controls the  
Information Effectively  
10BASE-T  
OfficeConnect hub  
OfficeConnect Switch  
The Switch effectively divides up your network, localizing  
the network traffic and passing on traffic as necessary (as  
shown in Figure 2). If you have workstations that  
100BASE-TX  
OfficeConnect  
hub  
communicate frequently in the same part of the network,  
traffic between them is not passed on unnecessarily to the  
remainder of the network, thereby reducing the load. If you  
have any high performance workstations that require a lot  
of bandwidth, connect them directly to the Switch.  
The Switches have an additional new feature to aid network  
performance at times of excessive load. It is called Priority  
Queuing. When a packet is received, the Switch will  
examine it to see if it has been priority encoded. If it has the  
Switch will then read the priority level and determine  
100BASE-TX  
High performance  
workstation  
8
 
     
Connecting 10BASE-T and 100BASE-TX Netw orks  
Before You Start  
The 10/100 ports can each be connected to either a  
10BASE-T or 100BASE-TX network. If you have both types  
of network, you can join them together using the Switch  
allowing all your workstations to communicate.  
Alternatively, if you use 10BASE-T and want to improve  
network performance by introducing 100BASE-TX  
technology, the Switch protects your existing workstations  
because it maintains 10BASE-T connections to them.  
Your OfficeConnect Dual Speed Switch comes with:  
One power adapter for use with the Switch.  
Four rubber feet.  
A stacking clip.  
Unit Connections  
To connect OfficeConnect units (such as hubs and other  
switches) to your Switch, you need:  
One suitable TP cable for each unit.  
9
 
     
Workstation Connections  
Tw isted Pair (TP) Cables  
To connect workstations or other equipment (such as  
servers) directly to your Switch, you need:  
Cables can be shielded (screened) or unshielded; we  
recommend that you use shielded cable. Cables used for  
100BASE-TX connections must be data grade (Category 5).  
The maximum length you can use is 100m (328ft).  
1
One 10BASE-T,  
100BASE-TX or  
3
10/100BASE-TX adapter  
card for each workstation.  
3Com produce a range of  
easy to install network  
adapters, which provide  
your workstation with a  
10BASE-T or 100BASE-TX connection.  
2
1
2
3
An operating system (for example, NetWare or Windows  
95/98) with network support configured, running on  
your workstations.  
One suitable twisted pair cable for each workstation.  
10  
 
   
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 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:  
To remove the clip:  
1
2
Place your unit on a flat surface.  
1
Remove the top unit together with the clip. If you hook  
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.  
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.  
3
4
Align the fastening pieces over the slots found on each  
side of the unit.  
2
Push the clip in the center, so it bends towards the base  
of the unit, and then separate once the clip is loose.  
Push the clip down gently to secure it, ensuring the  
fastening pieces snap into the slots on the unit.  
11  
 
       
Positioning Your Sw itch  
Securing Your Sw itch  
When installing your Switch, ensure:  
There are two slots on the underside of the OfficeConnect  
Switch that can be used for wall mounting. It is  
recommended that you mount the Switch with the LEDs  
facing upwards to prevent dust entering the cooling vents.  
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.  
When wall mounting the unit, ensure that it is within  
reach of the power outlet.  
Water or moisture cannot enter the case of the unit.  
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 guide  
on page 31 to mark the position of the holes. Fix the screws  
into the wall, leaving their heads 3mm (0.12in.) clear of the  
wall surface.  
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 25mm (1in.) clearance.  
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.  
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.  
12  
 
   
This may take a few seconds and the outcome will be  
Connecting Workstations and Other  
Equipment to Your Sw itch  
reflected in the LEDs on the front of the Switch.  
If the equipment connected to the Switch does not  
support auto-negotiation or if it has been disabled, it  
must be configured to operate in half duplex mode.  
WARNING: Please read the Important Safety  
Informationsection before you start.  
The Switch detects all port connections, so you can start  
using your network immediately. If you need more ports,  
simply add another OfficeConnect unit.  
WARNHINWEIS: Bitte lesen Sie den Abschnitt  
Wichtige Sicherheitsinformationensorgfältig durch,  
bevor Sie das Gerät einschalten.  
AVERTISSEMENT: Veuillez lire attentivement la  
section Consignes importantes de sécurité” avant de  
mettre en route.  
Connecting OfficeConnect Units to Your Sw itch  
You can increase the number of workstations that can  
connect to your network by adding OfficeConnect units  
(such as hubs and other switches). You can connect either a  
10BASE-T or a 100BASE-TX OfficeConnect unit to each port  
of the Switch.  
CAUTION: Do not power the Switch off and on quickly.  
Wait about five seconds between power cycles.  
10BASE-T cables are very easy to use. 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 connectors  
latch in and remove it.  
When a TP cable is connected to the Switch at one end and  
a workstation other equipment at other and both unit are  
powered, the Switch will automtically detect whether a  
straight or Crossovercable is being used and will  
compensate if required. The units will then Auto negotiate’  
to determine the fastest possible link speed between them.  
13  
 
   
feature, it means either a 'straight through' or 'crossover'  
UTP cable can be used in any Switch port to make the  
connection to other switches, hubs and workstations. The  
switch will automatically detect which wiring practice has  
been followed and will compensate accordingly.  
Checking Unit Connections  
When you have connected all your units, power on the  
units and the Switch. The Port Status LEDs for the ports you  
have used on both the units and the Switch should be on. If  
they are not, check your connections.  
Figure 4 Correct Connections for an OfficeConnect Hub  
Spot Checks  
At frequent intervals, visually check that:  
OfficeConnect  
Switch  
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.  
OfficeConnect  
Hub  
Twisted pair cable  
with RJ-45 connectors.  
Maximum length is  
100m (328ft)  
There is no uplink/normal push switch that is usually  
associated with OfficeConnect products. Instead the product  
has an automatic MDI / MDIX (Media Dependant Interface)  
14  
 
 
PROBLEM SOLVING  
The Switch has been designed to aid you when detecting  
and solving possible problems with your network. These  
problems are rarely serious; the cause is usually a  
disconnected or damaged cable, or incorrect configuration.  
If this section does not solve your problem, contact your  
supplier for information on what to do next.  
Please refer to pages 5 and 6 'Creating your Network' for a  
full description of the LED's.  
lf the Port Status LED has not lit after several seconds  
ensure the connected device is powered, the TP cable is not  
damaged and that it is correctly inserted at both ends.  
You may find a TP cable works when connected to the  
Switch but doesn't if it is disconnected from the Switch and  
connected to a different piece of equipment. This may be  
due to the advanced automatic MDI / MDIX feature of the  
Switch that the other equipment may not have.  
Perform these actions first:  
Ensure all network equipment is powered on.  
Power each piece of network equipment off, wait about  
5 seconds and then power each one on.  
Check the following symptoms and solutions:  
If the Alert LED is lit, there is a  
Alert LED continuously lit.  
problem with the network. Remove the port connections  
one at a time, waiting a few seconds between each port. If  
the Alert LED goes off, there is either a network loop or an  
excessive amount of broadcast traffic on that port  
connection:  
Pow er 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 pow er adapter  
w ith the Sw itch.  
Network loop Examine your connections and remove the  
loop. Each piece of equipment needs only one connection  
to your Switch.  
Port Status LED not lit for a port that has a TP cable  
connected. After connection it may take several seconds  
for the port status LED's to illuminate. The port status LED  
should turn Green or Yellow for each port that is  
Excessive amounts of broadcast frames Some pieces of  
connected. The Duplex LED may or may not illuminate.  
network equipment operate by sending out broadcast  
15  
 
 
frames regularly. Refer to the documentation that  
accompanies the piece of network equipment.  
If the Alert LED is still lit after removing all of your  
connections, there may be a problem with your Switch.  
Power it off, wait about 5 seconds and then power it on. If  
the Alert LED comes back on continuously, contact your  
supplier.  
16  
 
NETWORKING TERMINOLOGY  
A Netw ork 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
segment  
is the length of cable connected to a port.  
Packets are the units of information your workstations and  
other equipment send to each other over the network. A  
frame is the data part of the packet and can be unicast  
(sent to a single device), multicast (sent to multiple  
A Local Area Netw ork (LAN) is a network, usually in an  
devices), or  
broadcast  
(sent to all devices).  
office, that spans no more than a single site.  
Bandw idth refers to the amount of network traffic the  
Ethernet is a type of LAN, referring to the technology used  
to pass information around the network. It operates at  
10Mbps (megabits per second).  
network can hold at any one time (information capacity)  
measured in  
bits per second (bps)  
. Workstations or  
applications that use the network heavily are referred to as  
using high bandwidth. Fast Ethernet has a higher  
bandwidth than Ethernet, so it can cope with larger  
amounts of traffic, which results in faster operation.  
Fast Ethernet is a type of LAN that runs up to 10 times  
faster than standard Ethernet. It operates at 100Mbps.  
10BASE-T and 100BASE-TX are the names given to the  
Ethernet protocol that runs over Tw isted Pair (TP) cable.  
10BASE-T runs at 10Mbps whilst 100BASE-TX operates at  
100Mbps. The OfficeConnect Hubs and Switches Use RJ-45  
type connectors to connect your TP network.  
Full duplex operation allows information to be transmitted  
and received simultaneously and, in effect, doubles the  
potential throughput of a link.  
A netw ork loop occurs when two pieces of network  
equipment are connected to each other by two seperate  
connections.  
17  
 
Priority Queuing is the ability of a network to give and  
maintain certain throughput levels for different applications  
depending on the priority assigned to that application. At  
excessive loads a packet with a higher priority will take a  
greater precedence over a lower prioritised packet.  
Automatic MDI / MDIX this feature automatically detects  
which wiring practice that has been followed with regard to  
the TP cable, ie if the TP cable is a 'straight through' wired  
cable or a 'crossover' wired cable. The automatic MDI /  
MDIX feature within the Switch will detect and compensate  
accordingly.  
18  
 
DIMENSIONS AND STANDARDS  
Dimensions and Operating Conditions  
Standards  
Functional:  
ISO 8802/3  
Power requirement  
IEEE 802.3, 802.3u  
Switch 5:  
3.5 VA, 12 BThU/hr  
225 mm (8.08 in.)  
Switch 8:  
5.6 VA, 19.12 BThU/hr  
Safety:  
EMC:  
UL 1950, EN 60950  
CSA 22.2 #950, IEC60950  
35.35 mm  
(1.36 in.)  
EN 55022 Class B  
EN 55024  
FCC Part 15 Class B*  
ICES-003 Class B  
VCCI Class B  
135.4 mm (5.33 in.)  
0 to 40 °C (32 to 105 °F)  
operating  
temperature  
Switch 5: 0.6 Kg (1.3 lb)  
Switch 8: 0.6 Kg (1.3 lb)  
0 to 90%  
(non-condensing)  
humidity  
CNS 13438 Class A  
EN 60068 (IEC 68)  
Environmental:  
*Refer to “Regulatory Notices” on page 30 for conditions of  
operation.  
19  
 
     
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  
operations.  
3Com products do not contain any hazardous or  
ozone-depleting material.  
Reducing the waste generated by all operations.  
Environmental Statement about the Documentation  
Ensuring that all waste conforms to recognized  
environmental standards.  
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.  
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.  
20  
 
         
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 Switch. 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  
removal of the unit.  
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.  
Only stack the Switch 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.  
21  
 
 
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  
höchster Vorsicht vorzugehen.  
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.  
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.  
22  
 
 
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 dinstaller ou de  
retirer lappareil:  
Il ny a pas de parties remplaceables par les utilisateurs  
ou entretenues par les utilisateurs à lintérieur 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  
du groupe.  
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.  
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 lappareil  
et son accès doit être facile. Vous ne pouvez mettre  
lappareil hors circuit qu'en débranchant son cordon  
électrique au niveau de cette prise.  
Lappareil 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.  
23  
 
TECHNICAL SUPPORT  
3Com provides easy access to technical support information  
through a variety of services. This section describes these  
services.  
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 Know ledgebase 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  
This service gives all 3Com customers and partners  
complementary, round-the-clock access to technical  
information on most 3Com products.  
3Com offers worldwide product support 24 hours a day,  
7 days a week, through the following online systems:  
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:  
This service provides access to online support information  
such as technical documentation and software, as well as  
24  
 
     
Support from Your Netw ork 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.  
25  
 
   
Here is a list of worldwide technical telephone support num-  
bers. These numbers are correct at the time of publication.  
Refer to the 3Com Web site for updated information.  
Country  
Telephone Number  
Austria  
0800 297468  
0800 71429  
800 17309  
Belgium  
Denmark  
Finland  
Country  
Telephone Number  
0800 113153  
0800 917959  
0800 1821502  
06800 12813  
1800 553117  
1800 9453794  
800 8 79489  
0800 3625  
France  
Asia, Pacific Rim  
Australia  
Germany  
Hungary  
Ireland  
Israel  
Italy  
Luxembourg  
Netherlands  
Norway  
Poland  
Portugal  
South Africa  
Spain  
Sweden  
Switzerland  
U.K.  
1 800 678 515  
Hong Kong  
800 933 486  
India  
+61 2 9937 5085 or  
000800 6501111  
001 800 61 009  
03 5783 1270  
Indonesia  
Japan  
0800 0227788  
800 11376  
Malaysia  
1800 801 777  
New Zealand  
Pakistan  
Philippines  
P. R. o f C h i na  
0800 446 398  
00800 3111206  
0800 831416  
0800 995014  
900 983125  
020 795482  
0800 55 3072  
0800 966197  
+61 2 9937 5083  
1235 61 266 2602  
10800 61 00137 or  
021 6350 1590 or  
00800 0638 3266  
800 6161 463  
Singapore  
S. Korea  
From anywhere in S. Korea:  
From Seoul:  
Taiwan, R.O.C.  
Thailand  
82 2 3455 6455  
00798 611 2230  
00798 611 2230  
0080 611 261  
Latin America  
Brazil  
Mexico  
0800 13 3266  
01 800 849CARE  
800 666 5065  
001 800 611 2000  
Puerto Rico  
Central and South America  
AT&T +800 998 2112  
Europe, Middle East and  
Africa  
From anywhere in these  
regions, call:  
+44 (0)1442 435529 phone  
+44 (0)1442 436722 fax  
North America  
1 800 NET 3Com  
(1 800 638 3266)  
Europe and South Africa  
From the following countries,  
you may use the  
Enterprise Customers:  
1 800 876-3266  
toll-free numbers:  
26  
 
Country  
Telephone Number  
Fax Number  
Returning Products for Repair  
From the following countries, you may call the toll-free numbers;  
select option 2 and then option 2:  
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  
senders expense.  
Austria  
0800 297468  
0800 71429  
800 17309  
Belgium  
Denmark  
Finland  
0800 113153  
0800 917959  
0800 1821502  
00800 12813  
1800 553117  
1800 9453794  
1678 79489  
0800 0227788  
800 11376  
00800 3111206  
0800 831416  
0800 995014  
900 983125  
020 795482  
0800 55 3072  
0800 966197  
France  
Germany  
Hungary  
Ireland  
Israel  
Italy  
Netherlands  
Norway  
Poland  
Portugal  
South Africa  
Spain  
Sweden  
Switzerland  
U.K.  
To obtain an authorization number, call or fax:  
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  
Central and South  
America  
525 201 0075  
Argentina  
Bolivia  
Brazil  
0810 222 3266  
511 241 1691  
0800 133266 or  
55 11 5643 2700  
525 201 0004  
562 240 6200  
525 201 0004  
525 201 0004  
525 201 0004  
525 201 0004  
511 241 1691  
525 201 0004  
525 201 0004  
U.S.A. and Canada  
1 800 NET 3Com  
(1 800 638 3266)  
1 408 326 7120  
(not toll-free)  
Caribbean  
Chile  
Colombia  
Ecuador  
Mexico  
Paraguay  
Peru  
Uruguay  
Venezuela  
Enterprise Customers:  
1 800 876 3266  
27  
 
 
3Com Corporation LIMITED WARRANTY  
YEAR 2000 WARRANTY  
3Com OfficeConnect Dual Speed Sw itch 5, Sw itch 8  
The duration of the warranty for the OfficeConnect Dual Speed Switch 5 (3C16790) and  
Switch 8 (3C16791) is lifetime, including the power adapter.  
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 3Coms Web site,  
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.  
The OfficeConnect Dual Speed Switches are covered by a lifetime limited warranty, which also  
includes the power adapter. To qualify for the warranty, you must submit a registration card or  
register on-line at http://support.3com.com/registration/frontpg.pl. The OfficeConnect Dual  
Speed Switches are covered by a free 90-day telephone support.  
The lifetime limited warranty is not offered where restricted or prohibited by law.  
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:  
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.  
One (1) year (unless otherwise specified above)  
3Coms sole obligation under this express warranty shall be, at 3Coms 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.  
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 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.  
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 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 Customers 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 3Coms published specifications or  
user manual.  
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 3Coms 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 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.  
28  
 
 
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.  
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.  
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 the 3Com Web  
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.  
GOVERNING LAW  
3Coms 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.  
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.  
WARRANTIES EXCLUSIVE  
3Com Corporation  
5400 Bayfront Plaza  
Santa Clara, CA 95054  
(408) 326-5000  
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.  
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.  
LIMITATION OF LIABILITY  
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.  
29  
 
REGULATORY NOTICES  
CSA STATEMENT  
This Class B digital apparatus meets all requirements of the Canadian Interference-Causing  
Equipment Regulations.  
FCC STATEMENT  
Cet appareil numérique de la classe B respecte toutes les exigences du Règlement sur le  
matériel brouilleur du Canada.  
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.  
VCCI 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.  
BCIQ STATEMENT  
Consult the dealer or an experienced radio/television technician for help.  
INFORMATION TO THE USER  
The user may find the following booklet prepared by the Federal Communications Commission  
helpful:  
How to Identify and Resolve Radio-TV Interference Problems  
This booklet is available from the U.S. Government Printing Office, Washington, DC 20402,  
Stock No. 004-000-00345-4.  
In order to meet FCC emissions limits, this equipment must be used only with cables which  
comply with IEEE 802.3.  
Wall mounting screw hole guide  
150mm (5.9in.)  
30  
 
   
Part No. DUA1679-0AAA01  
Published February 2001  
31  
 

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