3COM 3C16700A, 3C16703A, 3C16701A User Manual
OfficeConnect
®
Ethernet Hub 4, 4C, 8, 8C
User Guide (3C16704A, 3C16703A, 3C16700A, 3C16701A)
3Com Corporation ■ 5400 Bayfront Plaza ■ Santa Clara, California ■ 95052-8145
Copyright © 1999, 3Com Technologies. All rights reserved.
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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
Novell, Inc.
All other company and product names may be trademarks of the respective
companies with which they are associated.
Year 2000 Compliance:
products, visit the 3Com Year 2000 Web page:
http://www.3com.com/products/yr2000.html
Environmental Statement:
Please e-mail any comments about this document to 3Com at:
pddtechpubs_comments@3Com.com.
(OfficeConnect Ethernet Hub 4, Hub 4C, Hub 8, Hub 8C), part number
(DUA1670-0AAA04) and, if appropriate, the page number.
For information on Year 2000 compliance and 3Com
Please recycle this user guide after use.
Please include the document title
Introduction 5
Problem Solving for the Hub 4 and 4C 15
Creating your Network 6
What Else Do I Need? 6
Workstation Connections 6
Transceiver Connections 6
Hub Connections 7
10BASE-2 7
10BASE-T 7
Twisted Pair (TP) Cables 7
Stacking the Units Together 8
The Rubber Feet 8
The Stacking Clip 8
Positioning Your Hub 9
Securing Your Hub 9
Using Your Hub 9
The OfficeConnect Ethernet Hub 4 and 4C 10
Ethernet Hub 4 and 4C—Front 10
Ethernet Hub 4 and 4C—Rear 11
Connecting Workstations and Other Equipment to Your Hub 12
Connecting Transceivers to the AUI Port 12
Connecting OfficeConnect Ethernet Hubs Together 12
Connecting Hubs Using 10BASE-2 13
Checking Connections 13
Connecting Hubs Using 10BASE-T 14
Checking Connections 14
Spot Checks 14
The OfficeConnect Ethernet Hub 8 and 8C 17
Ethernet Hub 8 and 8C—Front 17
Ethernet Hub 8 and 8C—Rear 18
Connecting Workstations and Other Equipment to Your Hub 19
Connecting OfficeConnect Ethernet Hubs Together 19
Connecting Hubs Using 10BASE-2 20
Checking Connections 20
Connecting Hubs Using 10BASE-T 21
Checking Connections 21
Spot Checks 21
Problem Solving for the Hub 8 and 8C 22
Networking Terminology 24
Dimensions and Standards 25
Dimensions and Operating Conditions 25
Standards 25
Environmental Statements 26
End Of Life Statement 26
Regulated Materials Statement 26
Environmental Statement about the Documentation 26
Environmental Statement about the Product Packaging 26
Important Safety Information 27
Wichtige Sicherheitshinweise 28
3
Consignes importantes de sécurité 29
Technical Support 30
Online Technical Services 30
World Wide Web Site 30
3Com Knowledgebase Web Services 30
Support from Your Network Supplier 31
Support from 3Com 31
Returning Products for Repair 34
3Com Corporation Limited Warranty 35
Electromagnetic Compatibility 38
4
NTRODUCTION
I
Welcome to the world of networking with 3Com®. In the
modern business environment, communication and sharing
information is crucial. Computer networks have proved to
be one of the fastest modes of communication but, until
recently, only large businesses could afford the advantage of
networking. The OfficeConnect
®
product range from 3Com
has changed this, bringing networks into the small office.
The OfficeConnect Ethernet Hub 4, OfficeConnect Ethernet
Hub 4C, OfficeConnect Ethernet Hub 8 and OfficeConnect
Ethernet Hub 8C, are ideal for creating small networks. They
are compact and attractively designed for desktop use.
These four products are part of the OfficeConnect range
which stack neatly together with the OfficeConnect stacking
clip.
This user guide describes how to use the OfficeConnect
hubs. The hubs have similar features and so this user guide
contains general and specific information. When referring to
all products, this guide uses the term ‘OfficeConnect hub’.
A single OfficeConnect hub allows you to create a small
network with up to four or eight workstations, as shown in
Figure 1. If you need to connect more workstations, simply
use the stacking clip to connect another OfficeConnect hub
to form a stack (each hub is a single repeater).
Figure 1
Print Server
Small Network With OfficeConnect Hub and Optional
HP JetDirect
OfficeConnect
print server
OfficeConnect hub
The OfficeConnect hubs have the following ports:
The Ethernet Hub 4 has four 10BASE-T ports.
■
The Ethernet Hub 4C has four 10BASE-T ports, a
■
10BASE-2 port and an AUI port.
The Ethernet Hub 8 has eight 10BASE-T ports.
■
The Ethernet Hub 8C has eight 10BASE-T ports and a
■
ninth 10BASE-2 port.
5
REATING YOUR
C
ETWORK
N
What Else Do I Need?
Your OfficeConnect hub comes with:
One power adapter for use with the OfficeConnect hub.
■
A Product Registration card for you to fill out and return.
■
Four rubber feet.
■
A stacking clip.
■
Two unit labels and eight cable ties.
■
An OfficeConnect Network Assistant CD-ROM.
■
2
An operating system (for example, Netware or
Windows 95/98) with network support configured,
running on your workstations.
3
One straight-through TP cable for every workstation, as shown in Figure 2.
In order to comply with the 10BASE-T standard, ports
designed for workstation connections have been
marked with the graphical symbol ‘x’. This denotes a
crossover in the port’s internal wiring, for example 1x,
2x, 3x...
To connect workstations and additional OfficeConnect hubs
to your hub, you need extra equipment. The extra
equipment listed in the next section is
provided with
not
the hub.
Workstation Connections
To connect workstations and other equipment to your hub,
you need:
1
10BASE-T connections for all
your equipment. 3Com produce
3
a range of easy to install
network adapter cards, which
provide your workstations with
2
1
10BASE-T connections.
Transceiver Connections
If you want to connect a transceiver to your hub (Hub 4C
only), you need:
An AUI cable. The maximum length you can use is 50m
■
(164ft).
A 10Mbps Ethernet transceiver for the chosen media
■
type. 3Com produce a range of easy to use transceivers.
6
Hub Connections
Depending on what ports your hub has, you can use either
10BASE-T or 10BASE-2 to connect your hubs together:
With 10BASE-2 you can connect up to 30 hubs on a
■
single segment, leaving all of the 10BASE-T ports free.
With 10BASE-T you can connect up to four hubs in
■
series.
10BASE-2
To connect additional hubs using 10BASE-2 (Hub 4C and 8C
only), you need (as shown in Figure 2):
One 10BASE-2 50 Ohm cable for each additional hub.
■
The minimum cable length you can use is 0.5m (1.6ft).
The maximum segment length is 185m (607ft).
One 10BASE-2 ‘Y’ piece for each hub. You can use ‘T’
■
pieces but ‘Y’ pieces provide optimal clearance of the
other ports.
Two 10BASE-2 50 Ohm terminators (end pieces).
■
10BASE-T
If you have additional hubs you want to connect using
10BASE-T, you need:
One straight-through TP cable for each extra hub.
■
Twisted Pair (TP) Cables
To connect your workstations and hubs, you must use
straight-through TP cable with RJ-45 connectors. Cables can
be shielded (screened) or unshielded; we recommend that
you use shielded. The maximum length you can use is 100m
(328ft). A straight-through cable is one where the pins of
one connector are connected to the same pins of the other
connector.
Figure 2
Ter mi na to r
(end piece)
Some of the 10BASE-2 Equipment You May Need
or
‘Y’ piece
‘T’ piece
7
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 securely.
CAUTION: You can stack up to a maximum of four
units. Smaller units must be stacked above larger
units.
To fit another unit:
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).
Figure 3
1
Stacking Your Units Together
Fastening
Piece
2
Fastening
Piece
To fit the clip:
1
Place your unit on a flat surface.
2
Fit the clip across the top of the unit, as shown in
Figure 3 (picture 1), ensuring that the longer sections of
the fastening pieces are pointing downwards.
3
Align the fastening pieces over the slots found on each side of the unit.
4
Push the clip down gently to secure it, ensuring the
fastening pieces snap into the slots on the unit.
To remove the clip:
1
Remove the top unit together with the clip. If you hook
a finger around one of the the fastening pieces and then
pull it gently from out of the slot, the clip should come
away with the upper unit attached to it.
2
Push the clip in the center, so it bends towards the base
of the unit, and then separate once the clip is loose.
8
Positioning Your 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 25.4mm (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 your hub, ensure that it is
within reach of the power outlet.
You need two suitable screws. Ensure that the wall you are
going to use is smooth, flat, dry and sturdy. Make two
screw holes which are 150mm (5.9in.) apart. Use the
template at the back of this guide to mark the position of
the holes. Fix the screws into the wall, leaving their heads
3mm (0.12in.) clear of the wall surface.
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 hubs, do not wall
mount stacked hubs.
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.
Using Your Hub
You are now ready to create your network, using your
OfficeConnect hub.
Read pages 10–16 if you have an:
OfficeConnect Ethernet Hub 4 or Hub 4C
■
Read pages 17–23 if you have an:
OfficeConnect Ethernet Hub 8 or 8C
■
When you have connected your equipment, you are ready
to use your network. If you suspect there is a problem, refer
to (depending on your hub):
“Problem Solving for the Hub 4 and 4C” on page 15
■
“Problem Solving for the Hub 8 and 8C” on page 22
■
9
THE O
FFICECONNECT ETHERNET
Ethernet Hub 4 and 4C—Front
HUB 4
AND
4C
Alert LED
orange
Alerts you to excessive
network use or an
isolated (partitioned)
10BASE-T port.
Alert
Power
Power LED
green
Indicates that the hub is
powered on.
Activity LED
(Hub 4 only)
yellow
Flashes each time
a packet is
received on a
port.
Collision
Activity
Green = OK, Yellow = Partitioned
10BASE-T Port Status LEDs
green/yellow
Indicates the status of each 10BASE-T port.
green
piece of network equipment is OK.
yellow
that segment.
off
has failed.
Port Status
1234
Collision LED
yellow
Flashes each time a collision is detected
on the network. Collisions are part of
normal network operation.
— The link between the port and the next
— The port has partitioned due to a fault on
— Nothing is connected to the port or the link
AUI/COAX
Green=AUI
off=COAX
Partitioned
1% 2% 3% 6% 12% 25% 50% 80%
AUI/COAX Status LEDs (Hub 4C only)
green/off=media, yellow=partition
Indicates the status of the AUI or 10BASE-2 port, depending on which one is in use.
green/off
— The left-hand status LED is green if the AUI port is in use, and off if either
the 10BASE-2 port is being used or nothing is connected to the port.
yellow
— If the right-hand status LED is yellow, the port in use has been partitioned.
10
Network Utilization LEDs (Hub 4C only)
green/yellow/orange
Indicates how much your network is being used.
Network Utilization
OfficeConnect Ethernet Hub 4C
Ethernet Hub 4 and 4C—Rear
Power Adapter socket
Only use the power adapter that is supplied with
this OfficeConnect hub. Do not use any other
adapter.
POWER COAX AUI
10BASE-2 port
Can be used to connect your hub to other OfficeConnect
hubs and equipment with 10BASE-2 cabling.
If used, it is effectively a fifth port. Refer to “Connecting
Hubs Using 10BASE-2” on page 13.
(Hub 4C only)
AUI port
Allows 10Mbps transceivers of different media types
to be connected to the hub. Connecting a
transceiver automatically disables the 10BASE-2
port.
(Hub 4C only)
Uplink
Normal
4
Uplink/Normal switch
Affects the operation of port 4. For correct usage, refer to
“Connecting Hubs Using 10BASE-T” on page 14.
Four 10BASE-T RJ-45 ports
Use 10BASE-T cable with RJ-45
connectors. You can connect the
OfficeConnect hub to any workstation
or piece of equipment that has a
10BASE-T port. Refer to “Connecting
Hubs Using 10BASE-T” on page 14.
1x
11
Connecting Workstations and Other Equipment to Your Hub
The hub detects all port connections, so you can start using
your network immediately. When you need more ports,
simply add more OfficeConnect hubs.
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.
Connect workstations and other equipment to any of the
hub’s 10BASE-T RJ-45 ports using 10BASE-T cables.
To connect a 10BASE-T cable, simply slot the connector into
the relevant RJ-45 port. When the connector is fully in, its
latch locks it into place. To disconnect the cable, push the
connector’s latch in and remove it.
If you are using port 4 to connect to a workstation
using a straight-through TP cable, ensure the
Uplink/Normal switch is set to Normal (out).
Connecting Transceivers to the AUI Port
You can connect a 10Mbps Ethernet transceiver to your hub
(Hub 4C only), using a standard AUI cable. Connect one
end of the cable to the transceiver and the other end to the
AUI port on the hub’s rear panel. This automatically disables
the 10BASE-2 port, and activates the AUI/COAX LED to
show the external transceiver is in use. Engage the slide
locks at both ends of the AUI cable.
Connecting OfficeConnect Ethernet Hubs Together
You can increase the number of workstations that can
connect to your network by adding more OfficeConnect
hubs. You can use either 10BASE-T or 10BASE-2 (Hub 4C
only) to do this.
Do not connect the same two hubs together using
both 10BASE-T and 10BASE-2. This causes a network
loop.
If you do not use the 10BASE-2 port, you do not
need to connect a terminator (end piece) to it. If the
AUI port is not used and a terminator is not
connected to the 10BASE-2 port, the port partitions
and the Coax Status LED lights yellow. This is correct
operation.
12
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