3Com OfficeConnect 3C1670500C User manual

3Com Corporation, Corporate Headquarters, 350 Campus Drive,
Marlborough, MA 01752-3064
www.3Com.com
10016681 REV BA June 2008
OfficeConnect®
Gigabit Switch 5 (3C1670500C)
Gigabit Switch 8 (3C1670800C)
User Guide
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3
Gigabit Switch 5
4.1W, 14 BTU/hr
power requirement
Gigabit Switch 8
4.8W, 16.4 BTU/hr
power requirement
Depth:
Switch 5:
85 mm (3.35 in)
Switch 8:
85 mm (3.35 in)
0 to 40ºC
(32 to 105ºF)
operating
temperature
0 to 95%
(non-condensing)
humidity
Width:
Switch 5:
112 mm (4.4 in)
Switch 8:
146 mm (5.75 in)
Green=1000M,Yellow=10/100M, Flash=Activity
About This Guide
This guide will use the term Switch when referring to the
OfficeConnect Gigabit Switch.
DIMENSIONS AND STANDARDS
Dimensions and Operating Conditions
Standards
Functional: ISO 8802/3, IEEE 802.3, 802.3u
Safety: UL 60950-1, EN 60950-1, CSA 22.2
#60950-1, IEC60950-1
EMC: EN 55022 Class B, EN 55024,
FCC Part 15 Class B*
ICES-003 Class B
Environmental: EN 60068 (IEC 68)
Gigabit Switch 5 Only: Category 5 screened cables must be used to ensure
compliance with the Class B requirements of the above standards. The use of
unscreened cables complies with the Class A requirements.
* Refer to Regulatory Notices in the Support and Safety Information Section.
INTRODUCTION
About This Guide:
Thank you for purchasing the 3Com®OfficeConnect®
Gigabit Switch. This high quality, Gigabit Ethernet Switch is
an easy, efficient way of creating a network or expanding
an existing network. The Switch’s Gigabit ports provide sup-
port for bandwidth intensive applications, and allow high-
speed connections to servers, and to the rest of the network. An
example configuration is shown in Figure 1.
This switch is one of the most compact designs in the industry
making it ideal for desktop use, and in keeping with the
3Com GreenConnect* tradition, this switch incorporates the
latest 65nm technology. This allows for lower power con-
sumption and decrease in carbon footprint. It can be used
with other units in the OfficeConnect family, which include
Cable/DSL gateways, wireless devices, Fast Ethernet and
Gigabit Ethernet switches. The OfficeConnect family is a fully
integrated system, enabling you to share computer resources,
and take advantage of new technologies as your network
grows.
Your Package Contains:
• OfficeConnect Switch
• Power adapter for use with the Switch
• Four rubber feet
• This User Guide
• Warranty flyer
2 *refer to GreenConnect Section of this User Guide for more information
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OfficeConnect
Fast Ethernet Switch 8
OfficeConnect
Gigabit Switch
On = 10/100M,Flash= Activity
Green= 1000M, Yellow=10/100M,Flash =Activity
CONFIGURATIONGREENCONNECT
Your OfficeConnect Gigabit Switch employs a number of
initiatives to ensure your product uses the least amount of
power possible:
1. High Efficiency Power Adapter
The Power Adapter is a model especially designed to meet
the Energy Star™requirements for operating efficiency and
also very low standby power when not connected to the
switch. These two features ensures your power adapter now
uses substantially less power than a conventional linear
adapter.
2. Energy Saving Modes
Your OfficeConnect Gigabit Switch employs the latest tech-
nology to minimise the amount of power it consumes. It uses
the latest 65nm silicon to deliver the lowest operating power,
and in addition uses features which under normal operating
conditions ensures your switch uses the least amount of
power.
When a port on the switch is not connected to a cable, or the
link partner is turned off or removed, the switch reduces the
power on that port until it is connected again.
You can be confident that your Switch will be taking the least
amount of power but still providing the performance that you
have come to expect from OfficeConnect.
4 5
Figure 1
Network showing sample configuration with Gigabit Switch.
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Green = 1000M, Yellow = 10/100M, Flash = Activity
OfficeConnect Gigabit Switch - Rear
3 Power Adapter Socket
Only use the power adapter that is supplied with the
Switch.
4 10BASE-T/100BASE-TX/1000BASE-T Ports
Use suitable TP cable with RJ-45 connectors. You can
connect your Switch to a workstation, or any other piece
of equipment that has 10BASE-T/100BASE-TX/
1000BASE-T connectivity.
Each port is capable of autosensing for 10 Mbps,
100 Mbps or 1000 Mbps operation.
All ports have an automatic MDI/MDIX feature, which
means either straight-through or crossover cable can be
used to connect to any port.
ABOUT YOUR SWITCH
OfficeConnect Gigabit Switch - Front
1 Power LED (Illuminated Logo)
Green
Indicates that the Switch is receiving power. If the LED is off
there may be a problem with the power adapter, power
adapter cable or the Switch's internal power supply. Refer
to Problem Solving.
2 Five/Eight/ Port Status LEDs
Green (1000 Mbps link) / Yellow (10 or 100 Mbps link)
If the LED is on, the link between the port and the next piece
of equipment is OK. If the LED is flashing, the link is OK and
data is being transmitted or received. If the LED is off, noth-
ing is connected or the connected device is turned off, or
there is a problem with the connection (refer to the Problem
Solving section).
6 7
3
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1 POSITIONING YOUR SWITCH
Safety Information
WARNING: Please read the ‘Important Safety
Information’ section in the Support and Safety
Information sheet before you start.
VORSICHT: 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.
When positioning your Switch, ensure:
• It is out of direct sunlight and away from sources of heat.
• Cabling is away from power lines, fluorescent lighting fix-
tures, and sources of electrical noise such as radios, trans-
mitters 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. 3Com recommends you provide
a minimum of 25 mm (1 in.) clearance.
Using the Rubber Feet
Use the four self-adhesive rubber feet to prevent your Switch
from moving around on your desk, or when stacking with flat
top OfficeConnect units. Only stick the feet to the marked
areas at each corner on the underside of your Switch.
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 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.
VORSICHT: RJ-45-Portes.
Diese Portes sind geschützte Datensteckdosen. Sie dürfen
weder wie normale traditionelle Telefonsteckdosen noch für
die Verbindung der Einheit mit einem traditionellenm
privatenm oder öffentlichenm Telefonnetzwerk gebraucht
werden. Nur RJ-45- Datenansclußhlüsse,
Telefonnetzsysteme oder Netztelefone an diese Steckdosen
anschließen.
Entweder geschützte oder ungeschützte Buchsen dürfen an
diese Datensteckdosen angeschlossen werden.
AVERTISSEMENT : Prises RJ-45 blindées.
Ces prises ne peuvent servir comme prises téléphone
standard et ne permettent pas la connexion de l'appareil à
un système PBX ni à un réseau téléphonique public. N'y
branchez que des prises RJ-45 mâles adaptées, ou des
systèmes de réseaux téléphoniques. Il est possible d'y
brancher des câbles blindés ou non comportant des prises
de type Jack (blindées ou non).
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Wall Mounting
There are two slots on the underside of the Switch that can
be used for wall mounting. The Switch must be mounted
with the LEDs facing upwards.
When wall mounting the unit, ensure it is within reach
of the power outlet
When wall mounting the unit, ensure that the rubber
feet are not fixed
Mounting Instructions for Cement Walls
1Make two holes 67mm apart for 5 port, and 100mm apart
for 8 port and insert two nylon or similar screw anchors
that are suitable for the wall construction.
2Fix two suitable screws into the anchors, leaving their
heads 3 mm (0.12 in.) clear of the wall surface. The screws
should be at least 30 mm (1.2 in.) long,
3Remove any connections in the Switch and locate it over
the screw heads. When in line, gently push the Switch on
to the wall and move it downwards to secure.
Mounting Instructions for Wood Walls
1Make two holes 67mm apart for 5 port, and 100mm apart
for 8 port.
2Fix two suitable screws directly into the wall, leaving their
heads 3 mm (0.12 in.) clear of the wall surface. The screws
should be at least 20 mm (0.75 in.) long,
3Remove any connections in the Switch and locate it over
the screw heads. When in line, gently push the Switch on
to the wall and move it downwards to secure.
CAUTION: When making connections, be careful not
to push the Switch up and off the wall.
10 11
Wall mounting template
Gigabit Switch 5 67mm apart Gigabit Switch 8 100mm apart
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Green= 1000M,Yellow = 10/100M, Flash =Activity
3 CONNECTING WORKSTATIONS
Twisted Pair (TP) Cables
Cables can be shielded (screened) or unshielded. Cables must
be Category 5 or above. 3Com recommends Category 5E
cable for Gigabit connections. The maximum length you can
use is 100 m (328 ft).
Twisted Pair (TP) cable is very easy to use. To connect a TP
cable, simply slot the connector into the relevant RJ-45 Port.
When a connector is fully in, its latch locks into place. To dis-
connect the cable, push the connector’s latch in and remove it.
When one end of a TP cable is connected to the Switch and
the other end is connected to the network interface card of a
workstation or other device, the Switch will automatically
detect whether a straight-through or crossover cable is being
used and will compensate if required. The units will then
autonegotiate to determine the fastest possible link speed
between them. This may take a few seconds and the out-
come will be reflected in the LEDs on the front of the Switch.
If the equipment connected to the Switch does not
support autonegotiation or it has been disabled, it
must be configured to operate in half duplex mode.
Expanding Your Network
You can increase the number of workstations and other
devices that can connect to your network by adding other
OfficeConnect gateways and switches. You can connect a
10BASE-T, 100BASE-TX or 1000BASE-T OfficeConnect unit to
each port of the Switch.
12 13
2 BEFORE YOU INSTALL YOUR SWITCH
Unit Connections
To connect other OfficeConnect units (such as gateways or
switches) to your Switch you need:
• One suitable Twisted Pair (TP) cable for each unit
3Com recommends Category 5E cable for Gigabit connections.
Workstation Connections
To connect workstations or other equipment (such as servers)
directly to your Switch, you need:
1 One adapter card for each workstation to be connected to
a port on the Switch. The adapter card must be capable of
communicating at the required connection speed. For
example, if you want to use a Gigabit connection, you
must install a 1000BASE-T adapter card.
2 An operating system (for example Windows/Mac/Linux)
with network support configured, running on your work-
stations.
3 One suitable Twisted Pair cable for each workstation.
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Traffic Prioritization
The Switch has a built in 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 whether it should be directed
through the normal or high priority channel. This feature can
be useful during excessive loads, for example, when one type
of traffic may require priority over another.
Automatic Loop Detect
This Switch has automatic loop detection technology which will
prevent unwanted recirculation of packets which could poten-
tially clog your network.
Connecting 10BASE-T/100BASE-TX/1000BASE-T
Networks
The ports can each be connected to a 10BASE-T/100BASE-TX/
1000BASE-T network. If you have various connection speeds
in your network, you can join them together using the Switch
allowing all your workstations to communicate. For example,
by connecting one of the ports to a server, all the worksta-
tions connected to the server can communicate with devices
connected to the Switch, significantly increasing the size of
your network.
Alternatively, if for example you use a 10BASE-T/100BASE-TX
network and want to improve network performance by intro-
ducing 1000BASE-T technology, the Switch protects the
investment in your existing workstations because it maintains
10BASE-T/100BASE-TX connections to them.
The Switch has automatic MDI/MDIX functionality. Simply
plug in the cable, and the Switch will automatically detect
which wiring practice has been followed, and will compen-
sate 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 should be lit. If they are not, check your connections.
4 HOW YOUR SWITCH CAN BE USED
Switching
When a network of repeater hubs is in operation, any infor-
mation that is sent by the workstation is passed around the
whole network (regardless of the destination of the informa-
tion). This can result in a lot of unnecessary traffic that can
slow the network down. The Switch solves this problem
because it "listens" to 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. This operation is called
"switching".
The Switch effectively divides up your network, localizing the
network traffic and passing on traffic as necessary. If you have
any high performance workstations that require a lot of band-
width, connect them directly to the Switch.
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5 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 dam-
aged cable, or incorrect configuration. If this section does not
solve your problem, contact your supplier for information on
what to do next.
Perform these actions first:
• Ensure all network equipment is powered on.
• Power each piece of network equipment off, wait about
five seconds and then power each one on.
CAUTION: Do not power the Switch off and then
immediately on. Wait about five seconds between
power cycles.
Check the following symptoms and solutions:
Power Status LED (Illuminated Logo) not lit.
The power adapter or power adapter connection is likely to
be faulty. Check your power adapter connection. If there is
still no power, contact 3Com Technical Support and ask for a
replacement power adapter. Please quote the power adapter
part number, shown on the OfficeConnect power adapter
you are currently using or refer to the table on next page.
16 17
Alternatively, quote the part number for your region:
3C number Region
3C12VUS US United States
3C12VUK UK United Kingdom
3C12VME ME Mainland Europe
3C12VAA AA Australasia
3C12VSA SA South Africa
3C12VKR KR South Korea
3C12VRA RA Argentina
Only use the power adapter supplied with the Switch
or a replacement OfficeConnect power adapter. Do
not use any other power adapter.
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 LEDs to illuminate. The Port Status LED should
turn Green or Yellow for each port that is connected,
depending on connection speed. Please refer to ‘About Your
Switch’ for a full description of the LEDs.
If the Port Status LED is not lit after several seconds, ensure
that the connected device is powered on, that the TP cable is
not damaged and that it is correctly inserted at both ends.
You may find that a TP cable works when connected to the
Switch, but that it does not if disconnected from the Switch
and connected to another device. This may be because the
other device does not have the automatic MDI/MDIX feature.
The Port Status LED is lit but the network performance of
the switch is poor. The switch supports full-duplex autonego-
tiation. If the connected device does not support autonegotia-
tion, ensure it is configured for half duplex operation only.
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Important Safety Information 
WARNING: Warnings contain directions you must follow for your
personal safety. Follow all directions carefully.
You must read the following safety information before carrying out any
installation or removal of the unit, or any maintenance procedures.
WARNING: Exceptional care must be taken during installation and
removal of the unit.
WARNING: To ensure compliance with international safety standards
this product must only be used with a power supply that is approved in
the country of use.
The power supply output must be +12VDC, 1A minimum and the polarity
of the power supply output connector must comply with the marking on
the unit.
WARNING: Disconnect the power adapter before moving the unit.
WARNING: This unit operates under SELV (Safety Extra Low Voltage)
conditions according to IEC 60950-1. The conditions are only maintained
if the equipment to which it is connected also operates under SELV
conditions.
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 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.
1918
Support
and Safety
Information
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