3Com 2816-SFP Plus (3C16485) Switch User Manual

3Com® Baseline Switch 2816-SFP Plus (3C16485)
User Guide
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Copyright © 3Com Technologies, 2004. All rights reserved. No part of this documentation
may be reproduced in any form or by any means or used to make any derivative work (such
as translation, transformation, or adaptation) without written permission from 3Com
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 implied
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.
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.
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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 Unpublished rights reserved under the copyright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, the 3Com logo and SuperStack are registered trademarks of 3Com Corporation.
Other brand and product names may be registered trademarks or trademarks of their
respective holders.
Environmental Statement
It is the policy of 3Com Corporation to be environmentally-friendly in all operations.
To uphold our policy, we are committed to:
■ Establishing environmental performance standards that comply with national legislation
and regulations.
■ Conserving energy, materials and natural resources in all operations.
■ Reducing the waste generated by all operations.
■ Ensuring that all waste conforms to recognised environmental standards.
■ Maximising the recyclable and reusable content of all products.
■ Ensuring that all products can be recycled, reused and disposed of safely.
■ Ensuring that all products are labelled according to recognised environmental standards.
■ Improving our environmental record on a continual basis.
SFP Operation 14
Approved SFP Transceivers 14
Inserting an SFP Transceiver 14
Removing an SFP Transceiver 15
About this Guide
Naming Convention 5
Conventions 5
Feedback about this User Guide
Product Registration 6
Baseline Switch 2816-SFP Plus
Package Contents 8
Mounting Kit Instructions
Introduction 17
Rack Mounting the Units
Automatic IP Configuration
How Your Switch Obtains IP Information
How Automatic IP Configuration Works
Automatic Process 19
Switch Configuration
Navigating Through the Switch Configuration Pages
Main Menu 21
Option Tabs 21
Fan Status 22
Summary Screen 22
Password 23
IP Settings 23
Port Configuration 24
VLANs 25
VLAN Configuration Examples 26
Create VLANs 28
Delete VLANs 28
Modify VLANs 29
How to Use the Baseline Switch 2816-SFP Plus
Front and Rear Panels 9
Front Panel Features 9
Rear Panel Features 11
Installation Recommendations
Positioning the Switch 13
Rack Mounting or Free Standing
Power Supply 13
Power Up 13
Spot Checks 14
Connecting to a Network Device
Membership VLANs
Trunking 30
Traffic Monitoring 32
System Tools 32
Restart 32
Configuration 33
Upgrade 33
Spanning Tree 35
802.1p Prioritization
Support 37
Technical Support
Where To Go For Help 51
Register Your Product to Gain Service Benefits
Purchase Value-Added Services 51
Troubleshoot Online 51
Purchase Value-Added Services 51
Contact Us 51
Telephone Technical Support and Repair 52
Using Discovery
Running the Discovery Application 39
Windows Installation (95/98/XP/2000/2003 Server/NT)
Regulatory Notices
Problem Solving
Safety Information
Technical Information
Related Standards 49
Environmental 49
Physical 49
Electrical 49
This guide is intended for use by those responsible for installing
and setting up network equipment; consequently, it assumes a
basic working knowledge of LANs (Local Area Networks).
Table 1 and Table 2 list conventions that are used throughout this
If a release note is shipped with this 3Com Baseline Switch
2816-SFP Plus and contains information that differs from the
information in this guide, follow the information in the release
Table 1
Most user guides and release notes are available in Adobe Acrobat Reader Portable Document Format (PDF) on the 3Com World
Wide Web site:
Notice Icons
Notice Type
Information note
Information that describes important
features or instructions
Information that alerts you to potential
loss of data or potential damage to an
application, system, or device
Information that alerts you to potential
personal injury
Naming Convention
Throughout this guide, the 3Com Baseline Switch 2816-SFP Plus
is referred to as the Switch.
Table 2
Category 3 and Category 5 Twisted Pair Cables are referred to as
Twisted Pair Cables throughout this guide.
Text Conventions
The words “enter”
and “type”
When you see the word “enter” in this guide, you
must type something, and then press Return or Enter.
Do not press Return or Enter when an instruction
simply says “type.”
Keyboard key
If you must press two or more keys simultaneously,
the key names are linked with a plus sign (+).
Press Ctrl+Alt+Del
Table 2
Do not use this e-mail address for technical support questions.
For information about contacting Technical Support, please refer
to “Support” on page 37.
Text Conventions (continued)
Words in italics
Italics are used to:
■ Emphasize a point.
■ Denote a new term at the place where it is defined
in the text.
■ Identify menu names, menu commands, and software button names. Examples:
From the Help menu, select Contents.
Click OK.
The Switch is part of the extensive Baseline range of 3Com products. This range includes hubs, switches, power systems and
other networking equipment, and is continually being developed. Contact your supplier for the latest product information
and to order these products.
Product Registration
You can now register your Baseline Switch on the 3Com web site
to receive up-to-date information on your product:
Feedback about this User Guide
Your suggestions are very important to us. They will help make
our documentation more useful to you. Please e-mail comments
about this document to 3Com at:
Please include the following information when commenting:
Document title
Document part number (on the title page)
Page number (if appropriate)
3Com Baseline Switch 2816-SFP Plus User Guide
Part Number DUA1648-5AAA0x
Page 24
The 3Com® Baseline Switch 2816-SFP Plus is a versatile,
easy-to-use configurable Switch. It is ideal for users who want
the high-speed performance of 10/100/1000 switching with the
added functionality of Gigabit links, but do not need
sophisticated management capabilities. The Switch is shipped
ready for use. No configuration is necessary.
Figure 1 Network Plan
Baseline Switch 2816-SFP Plus
The Switch has 16 shielded RJ-45, 10/100/1000 Mbps
auto-negotiating ports and four Small Form Factor Pluggable
(SFP) transceiver slots on the front panel for easy, flexible
connection to fiber-based Gigabit media. Each 10/100/1000
Mbps port automatically determines the speed and duplex mode
of the connected equipment and provides a suitable switched
connection. The four SFP ports support fiber Gigabit Ethernet
short-wave (SX) and long-wave (LX) SFP transceivers in any
combination. This offers you the flexibility of using SFP
transceivers to provide connectivity between the Switch and a
1000 Mbps core network.
Baseline 10/100 Switch
Endstations on switched
100 Mbps connections
Baseline 10/100 Switch
Endstations on switched
100 Mbps connections
2250 Plus
1000 Mbps copper or Fiber
connection to backbone
or server/worksation
Endstations on
switched 100 Mbps or 1000 Mbps
1000 Mbps link
10 Mbps or 100 Mbps link
The Switch is suitable for office use where it can be
free-standing, or rack mounted (in a wiring closet or equipment
Package Contents
The Switch comes with:
One power cord
Four standard height, self-adhesive rubber pads
One mounting kit
Installation CD
This User Guide
Warranty flyer
The Switch is powered from the AC supply.
AVERTISSEMENT: Points d’accès RJ-45. Ceux-ci sont protégés
par des prises de données. Ils ne peuvent pas être utilisés comme
prises de téléphone conventionnelles standard, ni pour la
connection de l’unité à un réseau téléphonique central privé ou
public. Raccorder seulement connecteurs de données RJ-45,
systèmes de réseaux de téléphonie ou téléphones de réseaux à
ces prises.
Il est possible de raccorder des câbles protégés ou non protégés
avec des jacks protégés ou non protégés à ces prises de données.
Front and Rear Panels
The front panel of the Switch contains a series of indicator lights
(LEDs) that help describe the state of various networking and
connection operations.
The numbers in this diagram refer to numbered sections in
“Front Panel Features” on page 9, and “Rear Panel Features” on
page 11.
WARNHINWEIS: RJ-45-Porte. Diese 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.
Entweder geschützte oder ungeschützte Buchsen dürfen an diese
Datensteckdosen angeschlossen werden.
Figure 2 Front and Rear Panels
Baseline Switch 2816-SFP Plus
Module Present
Link/Activity : Green = 1000M, Yellow = 10/1000M,
Flash = Activity, Duplex : On = Full, Off = Half
The Switch has 16 10/100/1000 Mbps auto-negotiating ports.
Each port supports automatic MDI/MDI-X detection and can be
connected to either a 10BASE-T, 100BASE-TX, or a 1000BASE-T
Front Panel Features
Ports 1 to 16 are auto-negotiating: their speed and duplex mode
(half duplex or full duplex for 10BASE-T and 100BASE-TX, full
duplex only for 1000BASE-T) are automatically determined by the
capabilities of the connected device.
1 RJ-45 10/100/1000 Ports
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.
3 Link/Activity Status LEDs
CAUTION: The Switch supports full duplex auto-negotiation. If
auto-negotiation is disabled for 1000BASE-T, then the Switch
uses the forced-mode default of 100 full duplex mode. If the
connected device does not support auto-negotiation, the Switch
will operate in half duplex mode (even if the attached device is
operating in full duplex mode). In such a configuration, you may
notice some degradation of network performance. 3Com
recommends that you use devices that are capable of
auto-negotiation (and that you ensure that auto-negotiation is
enabled, if it is a configurable option).
The following table lists LEDs visible on the front of the Switch,
and how to read their status according to color.
2 SFP Ports
The Small Form Factor Pluggable (SFP) ports are numbered 13 to
16. If an SFP transceiver (purchased separately) is installed in a
slot and is active, the associated RJ-45 port of the same number
is disabled.
The four SFP ports support fiber Gigabit Ethernet short-wave (SX)
and long-wave (LX) SFP transceivers in any combination. This
offers you the flexibility of using SFP transceivers to provide
connectivity between the Switch and remote 1000 Mbps
workgroups or to create a high-capacity aggregated link
backbone connection.
The link is operating at 1000 Mbps.
The link is operating at 10 or 100 Mbps.
Packets are being received or transmitted on the port at 1000
Packets are being received or transmitted on the port at 10 or
100 Mbps.
Yellow to
Port disabled or link loopback error.
The link has not been established, either nothing is connected
to the port, or there is a problem:
Check that the attached device is powered on.
Check that the cable or fiber is the correct type and is not
■ For fiber connections, ensure that the receive (RX) and
transmit (TX) cable connectors are not swapped.
If these checks do not identify the cause of the problem, it
may be that the unit or the device connected to the port is
faulty. Contact your supplier for further advice.
SFP ports are numbered 13-16 on the Switch. When an SFP port
is active it has priority over the 10/100/1000 port of the same
number. The corresponding 10/100/1000 port is disabled when
an SFP transceiver is plugged in.
4 Module Active LEDs
The Module Active LEDs shows the status of any SFP modules
that are installed.
Fiber SFP is inserted in the slot.
No fiber SFP is inserted in the slot.
Power-on self test is in progress.
Power-on self test or loopback test failed. Switch is in failsafe mode.
7 Self-adhesive Pads
The unit is supplied with four self-adhesive rubber pads.
5 Port Duplex LEDs
Do not apply the pads if you intend to rack mount the unit.
The second and fourth (bottom) row of Status LEDs, which are
colored yellow, show the duplex status of the related ports.
No link, not yet negotiated or the port is operating in
half-duplex mode.
The port is operating in full-duplex mode.
If the unit is to be part of a free-standing stack, apply the pads
to each marked corner area on the underside of the unit. Place
the unit on top of the lower unit, ensuring that the pads locate
with the recesses of the lower unit.
Rear Panel Features
8 Power Supply
6 Power LED
The Switch automatically adjusts to the supply voltage. Only use
the power cord that is supplied with the unit.
The Power LED shows the power status of the Switch:
9 Recovery button
The unit is powered on and ready for use.
The recovery button reinitializes the Switch. This returns the
Switch to the factory default settings if, for example, you have
forgotten the default IP address, or forgotten your user name or
The unit is not receiving power:
Check that the power cord is connected correctly.
If the unit still does not operate, contact your supplier.
CAUTION: 3Com recommends that you back up your
configuration settings before you recover the Switch, otherwise
your configuration will be lost. Refer to “Configuration” on
page 33 for details.
CAUTION: If installing the Switch in a free-standing stack of
different size Baseline or Superstack 3 units, the smaller units
must be installed above the larger ones. Do not have a
free-standing stack of more than six units.
Positioning the Switch
When deciding where to position the Switch ensure that:
It is accessible and cables can be connected easily.
Cabling is away from sources of electrical noise. These include
lift shafts, microwave ovens, and air conditioning units.
Electromagnetic fields can interfere with the signals on copper
cabling and introduce errors, therefore slowing down your
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 that you provide
a minimum of 25 mm (1 in.) clearance).
The air is as free from dust as possible.
Temperature operating limits are not likely to be exceeded. It
is recommended that the unit is installed in a clean, air
conditioned environment.
Power Supply
Power problems can be the cause of serious failures and
downtime in your network. Ensure that the power input to your
system is clean and free from sags and surges to avoid
unforeseen network outages. We recommend that you install
power conditioning, especially in areas prone to black outs,
power dips and electrical storms.
The unit is intended to be grounded. Ensure it is connected to
earth ground during normal use. Installing proper grounding
helps to avoid damage from lightning and power surges.
Power Up
Use the following sequence to power up the Switch:
It is always good practice to wear an anti-static wrist strap when
installing network equipment, connected to a ground point. If
one is not available, try to keep in contact with a grounded rack
and avoid touching the unit's ports and connectors, if possible.
Static discharge can cause reliability problems in your equipment.
Rack Mounting or Free Standing
The unit can be mounted in a 19-inch equipment rack using the
Mounting Kit, (refer to “Mounting Kit Instructions” on page 17),
or it can be free standing. Do not place objects on top of the
unit or stack.
Check the network connections and cables.
Connect the power supply cable to the appropriate power socket
on the rear panel of the unit; refer to “Power Supply” on
page 11.
Connect the plug to the power supply outlet socket and switch
on the power supply at the socket.
When the Switch is powered on, the Power LED should light up.
If it is not, refer to “Power LED” on page 11.
SFP transceivers are hot-insertable and hot-swappable. You can
remove them from and insert them into any SFP port without
having to power down the Switch.
Spot Checks
At frequent intervals you should visually check the Switch.
Regular checks can give you an early warning of a possible
failure; any problems can then be attended to when there will be
least effect on users. Check the following:
Check that all external cabling connections are secure
and that no cables are pulled taut.
Cooling fan
Where possible, check that the cooling fan is operating
by listening to the unit. The fan is fitted near to the
front right hand side of the unit (when viewed from the
Approved SFP Transceivers
The following list of approved SFP transceivers is correct at the
time of publication:
To access the latest list of approved SFP transceivers for the
Switch on the 3Com Corporation World Wide Web site, enter
this URL into your internet browser:
If you experience any problems operating the Switch, refer to
“Problem Solving” on page 41.
Inserting an SFP Transceiver
Connecting to a Network Device
To be recognised as valid, the SFP transceiver must have the
following characteristics:
To connect a device to the Switch use Category 5 unshielded or
shielded (screened) 100 Ohm TP cable (or Category 3 cable for a
10 Mbps connection). The maximum length of cable for each
connection is 100 m (328 ft). Connect one end of the cable to
an RJ-45 port on the Switch and the other end to the
appropriate RJ-45 port on the connecting device.
3Com recommends the use of Category 5e or 6 cables for
1000BASE-T operation.
SFP Operation
The following sections describe how to insert an SFP transceiver
into an SFP slot.
1000BASE-SX or 1000BASE-LX media type:
1000BASE-SX SFP transceiver
Use this transceiver to connect the Switch directly to a
multimode fiber-optic cable.
1000BASE-LX SFP transceiver
Use this transceiver to connect the Switch directly to a
single-mode fiber-optic cable or to multimode fiber using
a conditioned launch cable.
If the SFP transceiver is faulty, it will not operate within the
Switch. See “Problem Solving” on page 41.
Use of non-3Com SFPs is not recommended. If the SFP
transceiver is invalid it will not be recognised by the Switch.
Use the following sequence of steps to activate the SFP ports:
Hold the transceiver so that the fiber connector is toward you
and the product label is visible, as shown in Figure 3. Ensure the
wire release lever is closed (in the upright position).
Gently slide the transceiver into the SFP slot until it clicks into
Figure 3
Remove the plastic protective cover, if fitted.
Connect the fiber cable.
The transceiver connects to the network using a duplex LC
connector. Attach a male duplex LC connector on the network
cable into the duplex LC connector on the transceiver.
Inserting an SFP Transceiver
CAUTION: SFP transceivers are keyed and can be properly
inserted only one way. If the transceiver does not click when you
insert it, remove it, turn it over, and reinsert it.
Check the Module Active LEDs on the front of the Switch to
ensure that it is operating correctly.
Wire release
Flas tivity :
Suitable slot
on host Switch
Connect the other end of the cable to a device fitted with an
appropriate Gigabit Ethernet connection.
Removing an SFP Transceiver
If you wish to remove the transceiver (it is not necessary to
power-down your Switch):
Disconnect the cable from the transceiver.
Move the wire release lever downwards until it is pointing
toward you.
Pull the wire release lever toward you to release the catch
mechanism; the transceiver will then easily slide out.
Figure 4
Back Mounting the Units
The Switch is supplied with two mounting brackets and four
screws. These are used for rack mounting the unit. When
mounting the unit, you should take note of the guidelines given
in “Positioning the Switch” on page 13.
Rack Mounting the Units
The Switch is 1U high and will fit in a standard 19-inch rack.
CAUTION: Disconnect all cables from the unit before continuing.
Remove the self-adhesive pads from the underside of unit, if
already fitted.
Place the unit the right way up on a hard, flat surface with the
front facing towards you.
Locate a mounting bracket over the mounting holes on one side
of the unit.
Insert the two screws supplied in the mounting kit and fully
tighten with a suitable screwdriver.
Repeat the two previous steps for the other side of the unit.
Insert the unit into the 19-inch rack and secure with suitable
screws (not provided).
Reconnect the cables.
Switch 28
16-SFP Pl
Switch’s MAC address in the DHCP server’s lease list. Refer to
“IP Settings” on page 23.
This chapter explains more about IP addresses and how
automatic IP configuration works on the Switch.
3Com recommends that you do not use DHCP Addressing, unless
you have experience of configuring and managing a DHCP server.
For details on how to view and amend your Switch’s IP settings,
refer to “IP Settings” on page 23.
How Your Switch Obtains IP Information
How Automatic IP Configuration Works
Your Switch can obtain IP information using one of the following
When your Switch is powered up for the first time the IP
configuration setting is set to automatic — this is the default
Automatic IP Configuration (default) — the Switch will
configure itself with its default IP address
169.254.x.y,where x and y are the last two bytes of the
Switch’s MAC address.
If your Switch has been powered up before, whichever of the
three options for IP configuration (automatic, static or DHCP)
was last configured is activated when the Switch powers up
Refer to “Automatic Process” on page 19 for details on how
the Switch automatically obtains IP address information.
Automatic Process
Static IP Configuration — you can manually input the IP
information (IP address, subnet mask, and default gateway).
Refer to “IP Settings” on page 23. If your computers are
configured with static addresses and you do not wish to
change this, then you should use the Discovery program on
the Switch CD-ROM to detect and configure your Switch.
To detect its IP information using the automatic configuration
process, the Switch goes through the following sequence of
For details on how to use Discovery to detect the Switch on the
network, refer to “Using Discovery” on page 39.
The Switch tries to configure itself with the default IP address
169.254.x.y,where x and y are converted from the last two
bytes of the Switch’s MAC address.
For example, if the MAC address is 08004E000102, the IP
address would be This address is used if the
Switch is operating in a standalone mode, or no other Switches
on the network have this IP address.
DHCP Addressing — DHCP addressing is a dynamic
mechanism which the Switch uses to obtain an IP address
lease from the DHCP server which is located on your network.
If you select DHCP addressing, you will only be able to find
out the IP address of the Switch by cross referencing the
If this default IP address is already in use on the network then
the Switch detects this, and increments the last byte of the MAC
address by one to generate its IP address. The IP address would
therefore become
The Switch repeats step 2 until an unused IP address is found.
This chapter describes all the options available through the
Switch configuration pages, and is provided as a reference.
Navigating Through the Switch Configuration
To get to the configuration pages, browse to the Switch by
entering the URL in the location bar of your browser. The default
URL is http://169.254.x.y., where x and y are assigned by
the process described in “How Automatic IP Configuration
Works” on page 19. If you changed the Switch LAN IP address
during initial configuration, use the new IP address instead.
When you have browsed to the Switch, log in using your system
password. The default username is “admin.” There is no default
Summary — allows you to enter system information, and
displays the system up time.
Password — allows the administrator to change the system
IP settings — allows the administrator to configure the IP
settings of the Switch.
Port Configuration — allows the administrator to configure
the Switch’s port settings.
VLANs — allows the administrator to create VLAN groups,
add port members and to specify how VLAN tagging is used.
Trunking — allows the administrator to set up and maintain
trunk membership for port groups.
Traffic Monitoring — allows the administrator to perform port
traffic monitoring on the Switch.
System Tools — displays the current status and activity logs of
the Switch.
Support — contains a comprehensive online help system and
3Com contact information.
Main Menu
At the left side of all screens is a main menu, as shown in
Figure 5. When you click on a topic from the main menu, that
page will appear in the main part of the screen.
Figure 5
Switch Screen Layout
Option Tabs
Option Tabs
Each menu page may also provide sub-sections which are
accessed through the use of option tabs (see Figure 5 for
example). To access an option, simply click on the required tab.
Main Menu
Getting Help
On every screen, a Help button is available that provides access
to the context-sensitive online help system. Click this button for
further assistance and guidance relating to the current screen.
Fan Status
Summary Screen
At the bottom of all screens is an image of the Switch’s front
panel, as shown in Figure 6. At the right hand side of the panel
under the 3Com company name is an image depicting two fans.
These represent the Switch’s fans and their current status. A
green fan indicates normal operation, a red fan indicates that the
fan has failed to start. In the event of fan failure refer to
“Technical Support” on page 52.
Figure 6
Figure 7
Switch front panel layout
Fan operating
Fan failure
Summary Screen
The password is case sensitive.
You should change the password to prevent unauthorized access
to the Administration System.
Figure 8
IP Settings
The IP Settings menu allows you to view and amend your
Switch’s IP settings.
Password Screen
Figure 9
IP Settings Screen
To change the password:
Enter the current password in the Old Password field.
Enter the new password in the New Password field.
Enter the new password again in the Confirm Password field.
Click Apply to save the new password.
Management VLAN — This is the only VLAN through which
you can gain management access to the Switch.
IP Address Mode — Specifies whether IP functionality is
enabled via automatic IP configuration, manual configuration
(static) or dynamically using DHCP (Dynamic Host
Configuration Protocol).
IP Address — The IP address of the Switch, and the address
of the default VLAN (VLAN1).
Subnet Mask — This mask identifies the host address bits
used for routing to specific subnets.
Default Gateway — The IP address of the gateway router
between this device and management stations that exist on
other network segments.
MAC Address — The MAC address of this switch.
Port Configuration
You can use the Basic Port Configuration page to display the
current connection status, including the link status and
speed/duplex mode.
Figure 10
Basic Port Configuration Screen
Click Apply to save any changes you have made.
Number — Number of ports.
Label — Port name.
Status — Shows if the interface is enabled or disabled.
Flow Control — Shows if flow control is enabled or disabled.
Speed Duplex — Shows the current speed and duplex mode.
(Auto or fixed choice)
The Switch uses VLANs to organise any group of ports into
separate broadcast domains. VLANs confine broadcast traffic to
the originating group and can eliminate broadcast storms in large
networks. This also provides a more secure and cleaner network
In the Advanced Port Configuration page you can set the
Switch’s broadcast storm control and threshold limits.
Figure 11
Advanced Port Configuration Screen
You can create up to 256 VLANs, and either add specified ports
to a chosen VLAN so that the port can only communicate with
other ports on the VLAN, or specify that a port can belong to all
Communication between different VLANs can only take place if
they are all connected to a router or Layer 3 Switch.
Broadcast Storm Control — Shows if broadcast storm control
is enabled or disabled.
Packet Rate Threshold — Shows the broadcast storm
threshold. (500 - 15000 packets per second)
VLAN Configuration Examples
Desktop VLAN Configuration Example
Figure 12
Desktop VLAN Configuration Example
in VLAN 2
in VLAN 1
In the Modify VLANs screen (Figure 16), select Desktop from the
Mode drop down list for port 7.
Repeat step 2 for ports 8 and 16.
In the Modify VLANs screen, select 2 from the VLAN ID drop
down list for port 7.
Repeat step 4 for ports 8 and 16.
Ports 7, 8 and 16 now belong to VLAN2, and will not
communicate with any other ports until you add another port to
the VLAN, or change the port configuration.
Baseline Switch 2816-SFP Plus
in VLAN 1
in VLAN 2
This example explains how you can set up a simple VLAN
Configuration on your Switch using desktop connections. If you
want to add ports 7, 8 and 16 to VLAN2, as shown in Figure 12,
so that the ports on the default VLAN1 and the ports on VLAN2
cannot communicate with each other, do the following:
Use the Create VLANs screen (Figure 14) to create VLAN2, and
assign a name to it. (VLAN1 is the default VLAN and already
Uplink VLAN Configuration Example
Figure 13
In the Modify VLANs screen (Figure 16) for Switch 1, select
Desktop from the Mode drop down list for the ports you want to
add to VLAN2.
Select 2 from the VLAN ID drop down list for the ports you want
to add to VLAN2.
Repeat steps 2 and 3 for Switch 2.
Select Uplink as the Mode for port 16 on Switch 1.
Select Uplink as the Mode for port 8 on Switch 2.
Connect port 16 on Switch 1 to port 8 on Switch 2.
Uplink VLAN Configuration Example
in VLAN 1 (Desktop)
in VLAN 1 (Desktop)
in VLAN 2
Switch 1
Switch 2
Port 16 in VLANs 1 and 2 (Uplink)
Port 8 in VLANs 1 and 2 (Uplink)
Those ports on Switch 1 that are members of VLAN2 can now
communicate with those ports on Switch 2 that are members of
in VLAN 2
in VLAN 2 (Desktop)
in VLAN 1 (Desktop)
This example explains how you can set up a VLAN Configuration
across two Switches using Uplink connections. This enables ports
that are members of the same VLAN, but which are on different
switches to communicate, provided that a port on each switch is
set to Uplink, and that these ports are connected.
To set up the configuration shown in Figure 13, do the following:
Use the Create VLANs screen (Figure 14) to create VLAN2 on
both Switch 1 and Switch 2, and assign the same name to it.
(VLAN1 is the default VLAN and already exists.)
Create VLANs
Delete VLANs
Use the Delete VLANs page to remove a VLAN group from the
current list.
Use the Create VLANs page to set up VLANs. To propagate
information about VLAN groups used on this switch to external
devices, you must specify a VLAN ID for each of these groups.
Figure 14
Figure 15
Delete VLANs Screen
Create VLANs Screen
VLAN ID — ID of configured VLAN (1-4094, no leading
Name — Name of the VLAN (1 to 32 characters).
VLAN ID — ID of the VLAN to be deleted. If any port is
assigned to this group as untagged, it will be reassigned to
VLAN group 1 as untagged.
Modify VLANs
Use the Modify VLAN page to change the VLAN to which a port
belongs, and configure the port to communicate with all other
VLANs, or a selected VLAN.
Figure 16
Desktop - if you select this, the port can only communicate with other ports assigned to the VLAN selected in the
VLAN ID drop down list.
An Uplink port is sometimes referred to as a tagged port. The
two terms refer to the same feature.
Modify VLANs Screen
VLAN ID — Enter the ID of the configured VLAN to which you
want this port to belong.
Membership VLANs
Use the Membership VLAN page to configure port members for
the selected VLAN.
Figure 17
Port — Displays the port number.
Mode — The mode option determines if the port can
communicate with all VLANs, or only with a selected VLAN.
Uplink - if you select this, the port is able to communicate
with all VLANs on the Switch.
Membership VLANs Screen
VLAN ID — ID of the configured VLAN (1-4094, no leading
Name — Name of the VLAN (1 to 32 characters).
Ports — Port identifier.
Figure 18
Trunking Screen
Ports can be statically grouped into a trunk, also known as an
aggregated link under the IEEE 802.1ad standard. This increases
the bandwidth of a network connection and ensures fault
recovery. Trunking permits the connection of multiple ports to the
same remote device in order to achieve higher network
Guidelines for creating Trunks
Any of the ports on the Switch can be used for creating a
This switch can support a maximum of 4 trunks.
Trunk Number — Displays the number of the trunk.
Each trunk may contain up to 8 members.
A port may only be a member of one trunk at any one time.
Name — Allows you to label an interface. (Range: 1-64
All ports in a trunk must be configured in an identical
manner, including communication mode (i.e., speed, duplex
mode and flow control).
Flow Control — Allows automatic or manual selection of flow
Speed Duplex — Allows auto-negotiation to be enabled or
disabled. When auto-negotiation is disabled, you can force
the settings for speed, duplex mode and flow control.
Use the Trunking Create/Modify/Delete page to create, configure
or remove ports groups from trunks.
Use the Trunking Membership page to add ports to a group
Use the Trunking Summary page to display all of the
configuration settings for the created trunks.
Figure 19
Figure 20
Trunking Membership Screen
Port — The port number.
Status — The status refers to the speed and duplex mode of
the trunk members.
Trunk — ID of trunk.
Trunking Summary Screen
Traffic Monitoring
System Tools
Use the Traffic Monitoring window to enable port traffic
monitoring. The Switch supports the attachment of a network
analyzer to one port in order to monitor the traffic of other ports
on the Switch.
The System Tools menu includes five administration items:
Restart, Configuration, Upgrade, Spanning Tree and 802.1p
Figure 21
Traffic Monitoring Screen
Pressing the Restart the Switch button has the same effect as
power cycling the unit. No configuration information will be lost.
This function may be of use if you are experiencing problems and
you wish to re-establish your Internet connection.
Figure 22
Monitor Port — This is the port that is to be monitored.
Analyzer Port — This is the port that is connected to the
Restart Screen
locate the backup file on your computer, and then RESTORE
to copy the configuration back to the Switch.
Any network users who are currently accessing the Internet will
have their access interrupted while the restart takes place, and
they may need to reboot their computers when the restart has
completed and the Switch is operational again.
For security purposes, restoring the configuration does not
change the password.
Figure 23
Configuration Screen
If you want to reset the settings on your Switch to those that
were loaded at the factory, click RESET. You will lose all your
configuration changes. The Switch LAN IP address will revert
to the default IP address 169.254.x.y. (using the process
described in “Automatic Process” on page 19). You may need
to restart your computer to re-establish communication with
the Switch.
The Upgrade facility allows you to install on the Switch any new
releases of system software that 3Com may make available.
The newer version of software can be downloaded via HTTP and
once copied to the Switch; the Switch will restart and apply the
newer system software version.
Select the Configuration tab to display the Configuration screen
(Figure 23).
Click BACKUP to save the current configurations of the
Switch. You will be prompted to download and save a file to
If you want to reinstate the configuration settings previously
saved to a file, scroll down the web page and click Browse to
Figure 24
The following progress screen displays while the upgrade is
taking place.
Upgrade Screen
Figure 25
Once you have downloaded the software, use the Browse button
to locate the file on your computer, and then click on Apply.
Upgrade progress screen
The upgrade procedure can take a few minutes, and is complete
when the progress bar has finished running and the Power LED
has stopped flashing and is permanently green. Make sure that
you do not interrupt power to the Switch during the upgrade
procedure; if you do, the software may be corrupted and the
Switch may not start up properly afterwards. If the Power LED
continues to flash after a failed upgrade, refer to “Problem Solving” on page 41.
You may need to change the file type in the dialog box displayed
by your web browser to *.* to be able to see the file.
The file will be copied to the Switch, and once this has
completed, the Switch will restart. Although the upgrade process
has been designed to preserve your configuration settings, 3Com
recommends that you make a backup of the configuration
beforehand, in case the upgrade process fails for any reason (for
example, the connection between the computer and the Switch
is lost while the new software is being copied to the Switch).
Spanning Tree
blocked, which means that they are prevented from forwarding
This administrative tool supports the configuration of the Switch
to forward, or block and discard 802.1D spanning tree BPDU
Figure 26
Spanning Tree Screen
Spanning tree is a bridge-based system for providing fault
tolerance on networks and can be used to detect and disable
network loops. The spanning tree ensures that the optimal path
is maintained between spanning tree-compliant networked
devices by:
Disabling redundant paths when the main paths are
Enabling redundant paths if the main paths fail.
Spanning tree uses a distributed algorithm to select a bridging
device that serves as the root of the spanning tree network. The
bridging device known as the Root Bridge generates BPDUs
(Bridge Protocol Data Units) on all ports at a regular interval
known as the Hello Time. All other spanning tree-compliant
devices on the network have a designated Root Port. This is the
Port nearest the Root Bridge and it is used for receiving the
BPDUs initiated by the Root Bridge. If a bridge does not get a
Hello BPDU after a predetermined interval, the bridge assumes
that the link to the Root Bridge is down. This bridge will then
initiate negotiations with other bridges to reconfigure the
network to reestablish a valid network topology.
Forward — Spanning tree BPDU packets received on a port
are forwarded to all other ports.
Block and Discard — Spanning tree BPDUs received on a port
are dropped. The Switch does not forward BPDUs to other
The Switch does not participate as a bridge node in the spanning
tree, it can only be configured to forward or block spanning tree
BPDUs. If the Switch is connected to other bridging devices, such
as switches, that are part of the spanning tree network, set the
Switch to "Forward." If the Switch is connected only to
workstations, it can be set to "Block and Discard."
After all the bridges on the network have determined the
configuration of their ports, each bridge only forwards traffic
between the Root Port and the ports that are the Designated
Bridge Ports for each network segment. All other ports are
802.1p Prioritization
The Switch has priority queuing enabled, which means all
packets that are received are examined to see if they have been
priority encoded. If a packet has been priority encoded, then the
Switch will read the priority level and determine whether the
packet 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 comply with 802.1p, VLAN tagged
Best Effort
Standard (spare)
Excellent Effort (business critical)
Controlled Load (streaming multimedia)
Video (Interactive media), less than 100 millisecondsn
latency and jitter.
Voice (Interactive voice), less than 10 milliseconds
latency and jitter.
Network Control Reserved traffic
This switch uses the Weighted Round Robin (WRR) algorithm to
determine the frequency at which it services each priority queue.
The Switch allows you to choose between using IP Precedence or
DSCP (Differentiated Services Code Point) priority. When either of
these services is enabled, the priorities are mapped to a Class of
Service value by the Switch, and the traffic then sent to the
corresponding output queue.
The 802.1D standard specifies eight distinct levels of priority (0 to
7), each of which relates to a particular type of traffic. The
priority levels and their traffic types are shown in the following
Traffic Type
Traffic Type
The traffic prioritization feature supported by the Switch is
compatible with the relevant sections of the IEEE 802.1D
standard (incorporating IEEE 802.1p).
Traffic prioritization ensures that high priority data is forwarded
through the Switch without being delayed by lower priority data.
It differentiates traffic into classes and prioritizes those classes
automatically. Traffic prioritization uses the multiple traffic queues
that are present in the hardware of the Switch to ensure that
high priority traffic is forwarded on a different queue from lower
priority traffic, and is given preference over that traffic. This
ensures that time-sensitive traffic gets the highest level of service.
Priority Level
Priority Level
Figure 27
802.1p Prioritization screen
Selecting Support on the main menu displays the support links
screen, which contains a list of Internet links that provide
information and support concerning the Switch. (Figure 28)
Figure 28
Support Screen
Discovery will find the Switch even if it is unconfigured or
Running the Discovery Application
3Com provides a user-friendly Discovery application for detecting
the Switch on the network.
Figure 29
If your computers are configured with static addresses (also
known as fixed addresses) and you do not wish to change this,
then you should use the Discovery program on the Switch
CD-ROM to detect and configure your Switch.
Windows Installation (95/98/XP/2000/2003 Server/NT)
Insert the Switch CD-ROM in the CD-ROM drive on your
computer. A menu will appear; select Switch Discovery.
Discovery Welcome Screen
When the Welcome screen is displayed click on Next and wait
until the application discovers the Switches connected to your
Figure 30 shows an example Discovered Devices screen. Highlight
the Secure Switch by clicking on it, and click Next.
Figure 31
Figure 30
Discovery Finish Screen
Discovered Switch
Click on Finish to launch a web browser and display the login
page for the Switch.
Refer to the information about LEDs given earlier in this guide to
see if the problem can be identified and rectified. Here are some
common problems that can occur:
A link is connected but the Link/Activity Status LED for the
port does not light
The device being connected to is powered on and operating
The cable is connected at both ends.
The cable is not damaged.
If the connection is to a workstation, that the workstation's
network interface is installed and configured correctly.
The correct category of cable is being used for the required
link speed. Category 3 cable can be used for 10BASE-T
operation only. Category 5 cable is required for 100BASE-TX
or 1000BASE-T. 3Com recommends Category 5e or 6 cable
for 1000BASE-T operation.
The fiber cable is in good condition.
The SFP module is correctly inserted.
The equipment at the far end is installed and correctly
Ensure that the connected device has either:
Auto-negotiation enabled, or
The ports are configured for half-duplex operation
All ports appear to show continual activity
There may be broadcast storms on the network. Remove port
connections one at a time, waiting a few seconds between each
port. If the LEDs go off after removing a port connection, the
device that was connected to that port is introducing an
excessive amount of broadcast frames to the network (some
pieces of network equipment operate by sending out broadcast
frames regularly). Refer to the documentation that accompanies
the device for information on disabling the broadcast operation.
Check that:
The Receive (RX) and Transmit (TX) cable connectors are not
The Switch supports full-duplex auto-negotiation. If the
connected device does not support auto-negotiation, ensure it is
configured for half-duplex operation only. If the connected device
has auto-negotiation disabled or over-ridden, and is configured
as full duplex, the Switch will configure the link as half duplex,
causing a mis-match that will reduce network performance when
data is transmitting and receiving simultaneously on the same
A fiber cable is connected but the Module Active LED does
not light
A 3Com SFP module is being used. Refer to “Approved SFP
Transceivers” on page 14 for details.
The Link/Activity LED is lit but the network performance of
the Switch is poor
There is a problem with this connection. Check that:
Once the Switch has entered Fail Safe mode and is reset upon
startup the Switch will enter Automatic IP Configuration mode.
Refer to “How Automatic IP Configuration Works” on page 19
for details.
The Firmware image has become corrupted
If the firmware image becomes corrupted, you need to upgrade
the firmware. The Switch goes into Fail Safe mode, and the
screen shown in Figure 32 displays.
Figure 32
CAUTION: Before recovering the Switch, save the Switch’s
current configuration. Recovering the Switch will cause the
current configuration to be lost.
Fail Safe Mode Screen
You forget the Switch’s default IP address, or you forget
the User Name or Password that you assigned to the
The Discovery application can be used for detecting the Switch
on the network. Otherwise, you can restore the default settings,
using the recovery button on the rear panel of the Switch.
For details on how to use Discovery to detect the Switch on the
network, refer to “Using Discovery” on page 39.
You must recover the Switch, using the recovery button on the
rear panel of the Switch.
CAUTION: Before recovering the Switch, save the Switch’s
current configuration. Recovering the Switch will cause the
current configuration to be lost.
To recover the Switch:
To upgrade the firmware, click Browse, and follow the on-screen
instructions to upgrade the Switch to the required version of
Alternatively, click RESET to return the Switch to its factory
default settings.
Backup the current configuration. Refer to “Configuration” on
page 33 for details.
Turn off the Switch.
Press and hold in the recovery button on the rear panel of the
Switch using a pointed tool, and then turn on the Switch. After
at least 5 seconds, or when the LED flashes, release the recovery
button. The Switch will now enter fail safe mode, whereby the
Switch’s IP address, user name and password will be reset to the
factory defaults.
Click on the RESTART THE SWITCH button.
Restore the configuration file that you backed up in step 1. Refer
to “Configuration” on page 33 for details.
If the problem persists...
If the problem persists and the unit still does not operate
successfully, contact your supplier with the following information
before returning the unit:
Product number and serial number (printed on a label
supplied with the unit).
A brief description of the fault.
Power Cord Set
This must be approved for the country where it will be used.
Please read the following safety information carefully
before installing the Baseline Switch 2816-SFP Plus.
U.S.A. and
WARNING: Installation and removal of the unit must be carried
out by qualified personnel only.
■ If installing the Switch unit in a stack with other units, the
Switch unit must be installed below the narrower units and
above the deeper units.
■ The unit must be connected to an earthed (grounded) outlet
to comply with international safety standards.
■ Do not connect the unit to an A.C. outlet (power supply)
without an earth (ground) connection.
■ The appliance coupler (the connector to the unit and not the
wall plug) must have a configuration for mating with an
EN60320/IEC320 appliance inlet.
■ 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 60. The conditions are only
maintained if the equipment to which it is connected also
operates under SELV conditions.
France and Peru only
This unit cannot be powered from IT† supplies. If your supplies
are of IT type, this unit must be powered by 230 V (2P+T) via an
isolation transformer ratio 1:1, with the secondary connection
point labelled Neutral, connected directly to earth (ground).
Impédance à la terre
The cord set must be UL-approved and CSA certified.
The minimum specifications for the flexible cord are:
No. 18 AWG
Type SV or SJ
The cord set must have a rated current capacity of at least
10 A.
The attachment plug must be an earth-grounding type
with a NEMA 5-15P (15 A, 125 V) or NEMA 6-15P (15 A,
250 V) configuration.
The supply plug must comply with Section 107-2-D1, Standard DK2-1a or DK2-5a.
The supply plug must comply with SEV/ASE 1011.
The supply plug must comply with BS1363 (3-pin 13-amp)
and be fitted with a 5 A fuse which complies with
The mains cord must be <HAR> or <BASEC> marked and
be of type HO3VVF3GO.75 (minimum).
The supply plug must comply with CEE7/7 (“SCHUKO”)
The mains cord must be <HAR> or <BASEC> marked and
be of type HO3VVF3GO.75 (minimum).
connexion portant l’appellation Neutre et avec raccordement
direct à la terre (masse).
Cordon électrique
Il doit être agréé dans le pays d’utilisation.
Veuillez lire à fond l'information de la sécurité suivante
avant d'installer le Baseline Switch 2816-SFP Plus.
AVERTISSEMENT: L’installation et la dépose de ce groupe
doivent être confiés à un personnel qualifié.
■ Si vous entassez l’unité Switch avec les unités SuperStack 3
Hub, l’unité Baseline Switch 2816-SFP Plus doit être installée
en dessous des unités Hub plus étroites.
■ Ne branchez pas votre appareil sur une prise secteur
(alimentation électrique) lorsqu'il n'y a pas de connexion de
mise à la terre (mise à la masse).
■ Vous devez raccorder ce groupe à une sortie mise à la terre
(mise à la masse) afin de respecter les normes internationales
de sécurité.
■ Le coupleur d’appareil (le connecteur du groupe et non pas la
prise murale) doit respecter une configuration qui permet un
branchement sur une entrée d’appareil EN60320/IEC 320.
■ La prise secteur doit se trouver à proximité de l’appareil et son
accès doit être facile. Vous ne pouvez mettre l’appareil hors
circuit qu’en débranchant son cordon électrique au niveau de
cette prise.
■ L’appareil fonctionne à une tension extrêmement basse de
sécurité qui est conforme à la norme IEC60950. Ces
conditions ne sont maintenues que si l’équipement auquel il
est raccordé fonctionne dans les mêmes conditions.
France et Pérou uniquement:
Ce groupe ne peut pas être alimenté par un dispositif à
impédance à la terre. Si vos alimentations sont du type
impédance à la terre, ce groupe doit être alimenté par une
tension de 230 V (2 P+T) par le biais d’un transformateur
d’isolement à rapport 1:1, avec un point secondaire de
Etats-Unis et
La prise mâle d’alimentation doit respecter la section 107-2 D1
de la norme DK2 1a ou DK2 5a.
La prise mâle d’alimentation doit respecter la norme SEV/ASE
La prise secteur doit être conforme aux normes CEE 7/7
LE cordon secteur doit porter la mention <HAR> ou <BASEC>
et doit être de type HO3VVF3GO.75 (minimum).
Le cordon doit avoir reçu l’homologation des UL et un certificat de la CSA.
Le cordon souple doit respecter, à titre minimum, les spécifications suivantes:
calibre 18 AWG
type SV ou SJ
à 3 conducteurs
Le cordon doit être en mesure d’acheminer un courant nominal d’au moins 10 A.
La prise femelle de branchement doit être du type à mise à la
terre (mise à la masse) et respecter la configuration NEMA
5-15P (15 A, 125 V) ou NEMA 6-15P (15 A, 250 V).
Bitte unbedingt vor dem Einbauen des Baseline Switch
2816-SFP Plus die folgenden Sicherheitsanweisungen
WARNUNG: Die Installation und der Ausbau des Geräts darf nur
durch Fachpersonal erfolgen.
■ Wenn der Baseline Switch 2816-SFP Plus mit anderen 3Com
Hubs oder Switche gestapelt werden soll, müssen grössere
Geräte unter den schmaleren Hubs eingebaut werden.
■ Das Gerät sollte nicht an eine ungeerdete
Wechselstromsteckdose angeschlossen werden.
■ Das Gerät muß an eine geerdete Steckdose angeschlossen
werden, welche die internationalen Sicherheitsnormen erfüllt.
■ Der Gerätestecker (der Anschluß an das Gerät, nicht der
Wandsteckdosenstecker) muß einen gemäß EN 60320/IEC 320
konfigurierten Geräteeingang haben.
■ 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 60950. Diese
Bedingungen sind nur gegeben, wenn auch die an das Gerät
angeschlossenen Geräte unter SELV-Bedingungen betrieben
Stromkabel. Dies muss von dem Land, in dem es benutzt wird
geprüft werden:
Dieser Stromstecker muß die SEV/ASE 1011Bestimmungen
Das Netzkabel muß vom Typ HO3VVF3GO.75
(Mindestanforderung) sein und die Aufschrift <HAR> oder
<BASEC> tragen.
Der Netzstecker muß die Norm CEE 7/7 erfüllen (”SCHUKO”).
Related Standards
Power Inlet
AC Line Frequency
Input Voltage
Current Rating
Maximum Power
Maximum Power
The Baseline Switch 2816-SFP Plus has been designed to the
following standards:
ISO 8802-3, IEEE 802.3 (Ethernet), IEEE 802.3u (Fast
Ethernet), IEEE 802.3ab and IEEE 802.3z (Gigabit
Ethernet), IEEE 802.3x (Flow Control), IEEE 802.1D 1998
MAC Address
EMC Emissions
EN 55022 Class A, FCC Part 15 Subpart B Class A,
ICES-003 Class A, VCCI Class A
EN 55024
CSA/CUS (UL 1950 & CSA 22.2.950) IEC 60950 (CB),
EN 60950 (TüV/GS)
Operating Temperature
0–45 °C (32–113 °F)
10–95% (non-condensing)
EN 60068 (IEC 68)—various parts
440 mm (17.3 in.)
173 mm (6.8 in.)
43.6 mm (1.7 in.) or 1U
1.8 kg (3.969 lb)
Free standing, or 19 in. rack mounted using the
mounting kit supplied
IEC 320
47/63 Hz
100–240 VAC
1 Amp (maximum)
60 W
184.3 BTU/hr
Troubleshoot Online
Where To Go For Help
Contact your authorised 3Com reseller or 3Com for additional
product and support information. You will find support tools
posted on the 3Com web site at www.3com.com
3Com knowledgebase, which contains thousands of technical
solutions written by 3Com support engineers, helps you
troubleshoot 3Com products. This query-based interactive tool is
located at http://knowledgebase.3com.com
Register Your Product to Gain Service Benefits
Purchase Value-Added Services
To take advantage of warranty and other service benefits, you
must first register your product at
To enhance response times or extend warranty benefits, contact
3Com or your authorized reseller. Value-added services can
include 24x7 telephone technical support, software upgrades,
onsite assistance or advance hardware replacement. Experienced
engineers are available to manage your installation with minimal
disruption to your network. Expert assessment and
implementation services are offered to fill resource gaps and
ensure the success of your networking projects.
3Com eSupport services are based on accounts that you create
or have authorization to access. First time users must apply for a
user name and password that provides access to a number of
eSupport features including Product Registration, Repair Services,
and Service Request.
Purchase Value-Added Services
Contact Us
To enhance response times or extend warranty benefits, contact
3Com or your authorized 3Com reseller. Value-added services can
include 24x7 telephone technical support, software upgrades,
onsite assistance or advance hardware replacement. Experienced
engineers are available to manage your installation with minimal
disruption to your network. Expert assessment and
implementation services are offered to fill resource gaps and
ensure the success of your networking projects. More
information on 3Com Extended Warranty and Professional
Services is available at http://www.3com.com/Contact your
authorized 3Com reseller or 3Com for additional product and
support information.
3Com offers telephone, e-mail and internet access to technical
support and repair services. To access these services for your
region, use the appropriate telephone number, URL or e-mail
address from the list below.
Telephone Technical Support and Repair
Asia, Pacific Rim Telephone Technical Support and Repair
To obtain telephone support as part of your warranty and other
service benefits, you must first register your product at
Hong Kong
When you contact 3Com for assistance, please have the following information ready:
Product model name, part number, and serial number
A list of system hardware and software, including revision
Diagnostic error messages
Details about recent configuration changes, if applicable
Telephone Number
New Zealand
P.R. of China
S. Korea
Before you send a product directly to 3Com for repair, you must
first obtain an authorization number. Products sent to 3Com,
without authorization numbers clearly marked on the outside of
the package, will be returned to the sender unopened, at the
sender’s expense. If your product is registered and under
warranty, you can obtain an RMA number online at
1 800 678 515
800 933 486
+61 2 9424 5179 or
000800 6501111
001 803 61 009
00531 616 439 or
03 5977 7991
1800 801 777
0800 446 398
+61 2 9937 5083
1235 61 266 2602 or
1800 1 888 9469
800 810 3033
800 6161 463
080 333 3308
00801 611 261
001 800 611 2000
You can also obtain support in this region using the following
e-mail: apr_technical_support@3com.com
Or request a repair authorization number (RMA) by fax using
this number: +65 543 6348
These numbers are correct at the time of publication. Find a
current directory of support telephone numbers posted on the
3Com web site at
Telephone Number
Europe, Middle East, and Africa Telephone Technical
Support and Repair
From the Caribbean, Central and South America, call:
From anywhere in these regions,
call: +44 (0)1442 435529
Costa Rica
Dominican Republic
Puerto Rico
Trinidad and Tobago
Virgin Islands
From the following countries, you may use the numbers shown:
South Africa
Telephone Number
Latin America Telephone Technical Support and Repair
01 7956 7124
070 700 770
7010 7289
01080 2783
0825 809 622
01805 404 747
06800 12813
01407 3387
1800 945 3794
199 161346
342 0808128
0900 777 7737
815 33 047
00800 441 1357
707 200 123
0800 995 014
9 021 60455
07711 14453
08488 50112
0870 909 3266
You can also obtain support in this region using the following
URL: http://emea.3com.com/support/email.html
1 800 988 2112
0 810 444 3COM
1 800 998 2112
1 800 998 2112
1 800 998 2112
52 5 201 0010
1 800 998 2112
1 800 998 2112
0800 13 3COM
1 800 998 2112
AT&T +800 998 2112
AT&T +800 998 2112
AT&T +800 998 2112
1 800 998 2112
AT&T +800 998 2112
AT&T +800 998 2112
AT&T +800 998 2112
57 1 657 0888
AT&T +800 998 2112
1 800 998 2112
571 657 0888
01 800 849CARE
AT&T +800 998 2112
AT&T +800 998 2112
54 11 4894 1888
AT&T +800 998 2112
1 800 998 2112
AT&T +800 998 2112
1 800 998 2112
AT&T +800 998 2112
AT&T +800 998 2112
57 1 657 0888
Telephone Number
You can also obtain support in this region using the following:
Spanish speakers, enter the URL:
Portuguese speakers, enter the URL:
English speakers in Latin America should send e-mail to:
US and Canada Telephone Technical Support and Repair
1 800 876 3266
The IEEE specification for 10 Mbps Ethernet over Category 3, 4
or 5 twisted pair cable.
The information capacity, measured in bits per second, that a
channel can transmit. The bandwidth of Ethernet is 10 Mbps, the
bandwidth of Fast Ethernet is 100 Mbps and Gigabit Ethernet is
1000 Mbps.
The IEEE specification for 100 Mbps Fast Ethernet over Category
5 twisted-pair cable.
Bridge Protocol Data Unit. A type of information packet that
ensures that data is efficiently exchanged between Switches in a
LAN. BPDU messages detect loops in a network, and remove
them by shutting down the bridge causing the loop.
IEEE 802.3z specification for Gigabit Ethernet over 9/125 micron
core single-mode fiber cable.
Category 3 Cables
One of five grades of Twisted Pair (TP) cabling defined by the
EIA/TIA-568 standard. Category 3 is voice grade cable and can
only be used in Ethernet networks (10BASE-T) to transmit data at
speeds of up to 10 Mbps.
IEEE 802.3z specification for Gigabit Ethernet over two strands of
50/125 or 62.5/125 micron core multimode fiber cable.
Category 5 Cables
IEEE 802.3ab specification for Gigabit Ethernet over 100-ohm
Category 5, 5e or 6 twisted-pair cable (using all four wire pairs).
One of five grades of Twisted Pair (TP) cabling defined by the
EIA/TIA-568 standard. Category 5 can be used in Ethernet
(10BASE-T) and Fast Ethernet networks (100BASE-TX) and can
transmit data at speeds of up to 100 Mbps. Category 5 cabling is
better to use for network cabling than Category 3, because it
supports both Ethernet (10 Mbps) and Fast Ethernet (100 Mbps)
Auto-negotiation is where two devices sharing a link,
automatically configure to use the best common speed. The
order of preference (best first) is: 1000BASE-T full duplex,
100BASE-TX full duplex, 100BASE-TX half duplex, 10BASE-T full
duplex, and 10BASE-T half duplex. Auto-negotiation is defined in
the IEEE 802.3 standard for Ethernet and is an operation that
takes place in a few milliseconds. Auto-negotiation nust be
enabled for the 1000BASE-T ports to operate at 1000 Mbps, full
Category 5e Cables
Ethernet Address
One of five grades of Twisted Pair (TP) cabling defined by the
EIA/TIA-568 standard. Category 5e can be used in Ethernet
(10BASE-T), Fast Ethernet (100BASE-TX) and Gigabit Ethernet
(1000BASE-T) networks, and can transmit data at speeds of up
to 1000 Mbps.
See MAC address.
Fast Ethernet
An Ethernet system that is designed to operate at 100 Mbps.
Gigabit Ethernet
Category 6 Cables
An Ethernet system that is designed to operate at 1000 Mbps.
One of five grades of Twisted Pair (TP) cabling defined by the
EIA/TIA-568-B standard. Category 6 can be used in Ethernet
(10BASE-T), Fast Ethernet (100BASE-TX) and Gigabit Ethernet
(1000BASE-T) networks, and can transmit data at speeds of up
to 1000 Mbps.
Full Duplex
A system that allows packets to be transmitted and received at
the same time and, in effect, doubles the potential throughput of
a link.
Half Duplex
The term used to describe the desktop PC that is connected to
your network.
A system that allows packets to be transmitted and received, but
not at the same time. Half duplex is not supported for 1000
Mbps. Contrast with full duplex.
Dynamic Host Configuration Protocol. This protocol
automatically assigns an IP address for every computer on your
network. Windows 95, Windows 98 and Windows NT 4.0
contain software that assigns IP addresses to workstations on a
network. These assignments are made by the DHCP server
software that runs on Windows NT Server.
Institute of Electrical and Electronics Engineers. This
American organization was founded in 1963 and sets standards
for computers and communications.
IEEE 802.1D
Specifies a general method for the operation of MAC bridges,
including the Spanning Tree Protocol.
A LAN specification developed jointly by Xerox, Intel and Digital
Equipment Corporation. Ethernet networks use CSMA/CD to
transmit packets at a rate of 10 Mbps and 100 Mbps over a
variety of cables.
IEEE 802.1Q
IP Address
VLAN Tagging - Defines Ethernet frame tags which carry VLAN
information. It allows switches to assign endstations to different
virtual LANs, and defines a standard way for VLANs to
communicate across switched networks.
Internet Protocol Address. A unique identifier for a device
attached to a network using TCP/IP. The address is written as
four octets separated with periods (full-stops), and is made up of
a network section, an optional subnet section and a host section.
IEEE 802.1p
An IEEE standard for providing quality of service (QoS) in
Ethernet networks. The standard uses packet tags that define up
to eight traffic classes and allows switches to transmit packets
based on the tagged priority value.
Internet Service Provider. An ISP is a business that provides
connectivity to the Internet for individuals and other businesses
or organizations.
IEEE 802.3ad
Local Area Network. A network of end stations (such as PCs,
printers, servers) and network devices (hubs and switches) that
cover a relatively small geographic area (usually not larger than a
floor or building). LANs are characterized by high transmission
speeds over short distances (up to 1000 metres).
A standard that defines link aggregation. 802.3ad is now
incorporated into the relevant sections of the IEEE Std.
Layer 2
Internet Engineering Task Force. An organization responsible
for providing engineering solutions for TCP/IP networks. In the
network management area, this group is responsible for the
development of the SNMP protocol.
Data Link layer in the ISO 7-Layer Data Communications Protocol.
This is related directly to the hardware interface for the network
devices and passes on traffic based on MAC addresses.
Link Aggregation
Internet Protocol. IP is a layer 3 network protocol that is the
standard for sending data through a network. IP is part of the
TCP/IP set of protocols that describe the routing of packets to
addressed devices. An IP address consists of 32 bits divided into
two or three fields: a network number and a host number or a
network number, a subnet number, and a host number.
See Trunking.
Media Access Control. A protocol specified by the IEEE for
determining which devices have access to a network at any one
MAC Address
Media Access Control Address. Also called the hardware,
physical or Ethernet address. A layer 2 address associated with a
particular network device. Most devices that connect to a LAN
have a MAC address assigned to them as they are used to
identify other devices in a network. MAC addresses are 6 bytes
A computer in a network that is shared by multiple end stations.
Servers provide end stations with access to shared network
services such as computer files and printer queues.
Small From Factor Pluggable (SFP) Connectors are based on an
open standard that enables hot swapping of various type of fiber
optic and copper-based transceivers into the host equipment.
A Network is a collection of computers and other computer
equipment that are connected for the purpose of exchanging
information or sharing resources. Networks vary in size, some are
within a single room, others span continents.
Subnet Address
An extension of the IP addressing scheme that allows a site to
use a single IP network address for multiple physical networks.
Subnet Mask
Packet Internet Groper. An internet utility used to determine
whether a particular IP address is online. It is used to test and
debug a network by sending out a packet and waiting for a
A subnet mask, which may be a part of the TCP/IP information
provided by your ISP, is a set of four numbers configured like an
IP address. It is used to create IP address numbers used only
within a particular network (as opposed to valid IP address
numbers recognized by the Internet, which must assigned by
A set of rules for communication between devices on a network.
The rules dictate format, timing, sequencing and error control.
A network that is a component of a larger network.
A standard connector used to connect Ethernet networks. The
"RJ" stands for "registered jack."
A device that interconnects several LANs to form a single logical
LAN that comprises of several LAN segments. Switches are similar
to bridges, in that they connect LANs of a different type;
however they connect more LANs than a bridge and are
generally more sophisticated.
Transmission Control Protocol/Internet Protocol. This is the
name for two of the most well-known protocols developed for
the interconnection of networks. Originally a UNIX standard,
TCP/IP is now supported on almost all platforms, and is the
protocol of the Internet.
TCP relates to the content of the data travelling through a
network — ensuring that the information sent arrives in one
piece when it reaches its destination. IP relates to the address of
the end station to which data is being sent, as well as the
address of the destination network.
Traffic Monitoring
Enables the monitoring of port traffic by attaching a network
analyzer to one switch port, in order to monitor the traffic of
other ports on the Switch.
A method which specifies how to create a single high-speed
logical link that combines several lower-speed physical links.
A Virtual LAN is a collection of network nodes that share the
same collision domain regardless of their physical location or
connection point in the network. A VLAN serves as a logical
workgroup with no physical barriers, and allows users to share
information and resources as though located on the same LAN.
1000BASE-LX 55
1000BASE-SX 55
1000BASE-T 55
100BASE-TX 55
10BASE-T 55
802.1p Prioritization 36
detecting the Switch 39
DHCP server
configuring 30
front panel 9
Discovery application 39
dynamic host control protocol 56
admin password
changing 23
automatic IP configuration 19
Ethernet 56
bandwidth 55
Baseline Switch 2816-SFP Plus 49
fan status 22
Fast Ethernet 56
FCC statement 65
Feedback about this User Guide 6
category 3 cables 55
category 5 cables 55
Category 5e Cables 56
Category 6 Cables 56
changing the admin password 23
client 56
configuring computers 17
configuring the Switch 21
CSA statement 65
upgrading 33
default IP address 42
password 42
user name 42
front panel diagram 9
full duplex 56
getting help 21
Gigabit Ethernet 56
MAC address 57
main menu 21
manual configuration 19
media access control 57
half duplex 56
help menu 21
network defined 58
IP address 19
obtaining support/feedback 37
automatic IP configuration 19
DHCP addressing 19
Discovery program 19
static IP configuration 19
IP defined 57
IP Precedence 36
ISP defined 57
password 42
changing 23
positioning the Switch 13
power cycle 32
802.1p 36
traffic 36
protocol defined 58
LAN defined 57
LAN settings
configuring 23
loading Switch configuration 32
local area network 57
restarting the Switch 32
restoring Switch configuration 33
RJ-45 defined 58
saving Switch configuration 32
server defined 58
setting up computers 17
subnet mask 58
support 37
Support for your product 51
defined 59
technical specifications 49
traffic 59
traffic prioritization 36
changing the password 23
configuration 21
positioning 13
restarting 32
switch defined 58
system tools 32
upgrading firmware 33
VCCI statement 65
configuration example 25
create a 27
delete a 28
modify a 28
FCC Statement
CE Statement (Europe)
This equipment has been tested and found to comply with the limits for a Class A digital
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a commerical environment. 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. Operation of this equipment in a residential area is likely to cause
harmful interference to radio communications, in which case the user will be required to
correct the interference at their own expense.
This product complies with the European Low Voltage Directive 73/23/EEC and EMC
Directive 89/336/EEC as amended by European Directive 93/68/EEC.
CSA Statement
This Class A digital apparatus meets all requirements of the Canadian
Interference-Causing Equipment Regulations.
Cet appareil numérique de la classe A respecte toutes les exigences du Règlement sur le
matériel brouilleur du Canada.
Information to the User
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.
If necessary the user should consult the dealer or an experienced radio/television
technician for additional suggestions. 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.
Part Number: DUA1648-5AAA02
Published: September 2004