11 Mbps Wireless LAN Access Point 2000 User Guide

11 Mbps Wireless LAN Access Point 2000 User Guide
11 Mbps Wireless LAN
Access Point 2000
User Guide
The simple, affordable way to network without wires.
Version 1
http://www.3com.com/
http://support.3com.com/registration/frontpg.pl/
Published February, 2002
Version 1.0.3
3Com Corporation
5400 Bayfront Plaza
Santa Clara, California
95052-8145
Copyright © 2002 3Com Corporation. 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 Corporation.
3Com Corporation reserves the right to revise this documentation and to make changes in content from time
to time without obligation on the part of 3Com Corporation to provide notification of such revision or change.
3Com Corporation provides this documentation without warranty, term, or condition of any kind, either
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If there is any software on removable media described in this documentation, it is furnished under a license
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please contact 3Com and a copy will be provided to you.
UNITED STATES GOVERNMENT LEGEND
If you are a United States government agency, then this documentation and the software described herein
are provided to you subject to the following:
All technical data and computer software are commercial in nature and developed solely at private expense.
Software is delivered as “Commercial Computer Software” as defined in DFARS 252.227-7014 (June 1995)
or as a “commercial item” as defined in FAR 2.101(a) and as such is provided with only such rights as are
provided in 3Com’s standard commercial license for the Software. Technical data is provided with limited
rights only as provided in DFAR 252.227-7015 (Nov 1995) or FAR 52.227-14 (June 1987), whichever is
applicable. You agree not to remove or deface any portion of any legend provided on any licensed program
or documentation contained in, or delivered to you in conjunction with, this User Guide.
Unless otherwise indicated, 3Com registered trademarks are registered in the United States and may or may
not be registered in other countries.
3Com is a registered trademark and the 3Com logo is a trademark of 3Com Corporation. Wi-Fi is a
trademark of the Wireless Ethernet Compatibility Alliance.
Microsoft and Windows are registered trademarks of Microsoft Corporation.
All other company and product names may be trademarks of the respective companies with which they
are associated.
EXPORT RESTRICTIONS: This product contains Encryption and may require US and/or Local Government
authorization prior to export or import to another country.
CONTENTS
INTRODUCTION
Product Registration and Support
5
INSTALLING AN ACCESS POINT
Before You Begin 7
Where should I Place the Access Point? 7
Do I Need to Configure the Access Point? 7
Connecting the Access Point 8
Checking the LED Indicators 8
Summary of Configuration Steps 9
Installing the Infrastructure Device Manager 9
CONFIGURING THE ACCESS POINT 2000
Launching a Wireless Device Configuration 11
Changing Access Point Properties 12
Setting Network Properties 13
Access Point Network 13
Wireless DHCP Server 13
Setting Data Transmission Properties 14
Changing Encryption Settings 14
No Security (Open System) 14
40-bit Shared Key (Wi-Fi) 14
128-bit Shared Key 15
Changing the Administration Password 15
Using Configuration Templates 15
Creating a Template 15
Loading a Template 15
Saving Access Point Configurations 15
Backing up an Access Point Configuration 16
Restoring an Access Point Configuration 16
Viewing System Status 16
Upgrading the System 16
Downloading Upgrade Files 16
Installing an Upgrade 17
Restoring an Access Point to Factory Defaults 17
Interoperating with Third-Party Equipment 17
TROUBLESHOOTING
Diagnosing Problems 19
Uninstalling Software Utilities
20
WIRELESS LAN BASICS
How Does a Wireless LAN Work? 21
Network Association 21
Roaming 21
Security 21
Ad Hoc Networks 21
Setting Up a 3Com Wireless LAN 22
All Wireless Networks 22
Wired/Wireless Networks 22
TECHNICAL SUPPORT
Online Technical Services 25
World Wide Web Site 25
3Com Knowledgebase Web Services 25
3Com FTP Site 25
Support from Your Network Supplier 26
Support from 3Com 26
Returning Products for Repair 28
REGULATORY COMPLIANCE INFORMATION
INDEX
1
INTRODUCTION
3Com wireless systems let you simply and confidently extend network information
and applications to difficult-to-wire locations and to your mobile workforce,
making your business more productive, competitive and successful. The 3Com 11
Mbps Wireless LAN Access Point 2000 is the affordable choice for extending your
network to places where wires cannot go.
A single access point can make the Internet, e-mail, and network resources such
as printers available to dozens of wireless client users. And because 3Com 11
Mbps Wireless LAN equipment is Wi-Fi certified, you can be sure it will work
reliably with certified equipment from other manufacturers.
Product Registration
and Support
To register your product with 3Com, go to the following Web page:
http://support.3com.com/registration/frontpg.pl
For support information, see “Technical Support” on page 25 or log on to the
3Com Web site at http://www.3com.com and navigate to the product
support page.
6
CHAPTER 1: INTRODUCTION
2
Before You Begin
INSTALLING AN ACCESS POINT
The following items, which are provided with the 3Com 11 Mbps Wireless LAN
Access Point 2000, are required for installation:
■
Power adapter and power cord.
■
Ethernet crossover cable.
Before you connect the access point, decide where to place it and whether you
need to configure it.
Where should I Place the
Access Point?
You should place the access point in a dry, clean location near a power source and
an Ethernet connection, and away from transformers, heavy-duty motors,
fluorescent lights, microwave ovens, refrigerators, or other equipment that could
cause radio signal interference.
Do I Need to Configure
the Access Point?
If your 3Com Wireless LAN has only one access point, a few clients, and no special
security requirements, you can use the 3Com access point just as it was shipped
from the factory. 3Com recommends that you set encryption to secure the
network.
To use the administration tool, which helps you select 3Com wireless LAN devices
and launch their configurations, you need a computer running one of the
following operating systems and Internet Explorer 5.0 or later.
■
Windows XP
■
Windows 2000
■
Windows NT 4.0
■
Windows Me
■
Windows 98
■
Windows 95
The following table shows the access point configuration factory defaults.
Property
Default Setting
Device Name
3Com Access Point 2000
Device Location
None
WLAN Service Area
3Com
Help File Location
Local Drive
Help File Path
C:\Program Files\3Com\3Com Wireless Infrastructure Device
Manager\ManagementHelp\AP2000
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CHAPTER 2: INSTALLING AN ACCESS POINT
Property
Default Setting
Access Point Network
Obtain an IP address automatically (Used if a DHCP server
is available. If a DHCP server does not assign it an IP address, the
access point’s default IP address is 169.254.xxx.1, where xxx is
the last byte of the access point’s MAC address))
Wireless DHCP Server
Enabled
Clear Channel Select
Automatically select the best channel
Network Traffic Accelerator Off (Wi-Fi interoperable)
Data Preamble
Long (Wi-Fi interoperable)
Encryption Setting
No Security (Open System)
Administration Password
None
If the configuration that was set at the factory does not meet your network
requirements, or if you want to customize settings, see “Summary of
Configuration Steps” on page 9.
Connecting the
Access Point
Place the access point on a flat surface such as a table, desktop, or the top of a
cabinet and connect it to power and to a port on your hub or switch as
shown below.
Crossover
cable
For correct operation, use the provided Ethernet crossover cable. If you use a
standard straight-through (UTP) Ethernet cable, you must connect to the hub’s
uplink (MDIX) port.
Checking the LED
Indicators
When the access point is connected to power, two LEDs indicate activity
as follows:
LED Indicator Location
Wireless
association
On the top of
the access
point
Description
■
On—Unit is receiving power.
■
Off—Unit is not receiving power.
■
Ethernet
connection
At the RJ45
Ethernet conn
ector
Blinking—The unit is transmitting or receiving. Faster
blinking indicates faster transmission speed.
■
On—Unit has an Ethernet connection.
■
Off—Unit does not have an Ethernet connection.
■
Blinking—Wired LAN traffic is detected. Faster blinking
indicates heavier traffic.
Summary of Configuration Steps
Summary of
Configuration Steps
9
After you connect the access point, you may need to change its configuration
settings. The default configuration settings are shown in “Do I Need to Configure
the Access Point?” on page 7. To change these settings, follow these steps:
1 Install the 3Com Wireless Infrastructure Device Manager on a computer as
described in “Installing the Infrastructure Device Manager”.
2 Launch the device manager and select the access point as described in “Launching
a Wireless Device Configuration” on page 11.
3 Use the 3Com 11 Mbps Wireless LAN Access Point 2000 Configuration
Management System to change and save the settings. For details, see
“Configuring the Access Point 2000” on page 11.
Installing the
Infrastructure Device
Manager
The 3Com installation CD contains the 3Com Wireless Infrastructure Device
Manager, an administration tool that helps you select 3Com wireless LAN devices
and launch their configurations in your Web browser. The device manager must
be installed on a computer that is on the same network segment or that can
associate with the access point and is running one of the Windows
operating systems and Web browsers listed in “Before You Begin” on page 7.
Follow these steps to install the device manager:
1 Turn on the computer.
2 Put the 3Com CD in the CD-ROM drive.
The setup menu appears. If it does not appear, you can start the setup menu from
the Windows Start menu. For example: Start/Run/D:setup.exe.
3 In the menu, click Install the Tools and Documentation.
4 In the next screen, click Install the Administration Tool.
5 Follow the instructions on the screens to complete the installation.
If you are prompted to reboot the computer, do so.
6 To launch the tool from the Windows Start menu. Select Start/Programs/3Com
Wireless Infrastructure Device Manager/3Com Wireless Infrastructure
Device Manager
For details on using the tool, see “Launching a Wireless Device Configuration” on
page 11.
10
CHAPTER 2: INSTALLING AN ACCESS POINT
3
CONFIGURING THE ACCESS POINT 2000
If the configuration that was set at the factory does not meet your network
requirements, or if you want to customize the settings, you can use these tools to
change the configuration:
■
3Com Wireless Infrastructure Device Manager—The Device Manager helps
you locate 3Com wireless LAN infrastructure devices on the same network
segment as your computer. It displays the devices in a tree format, from which
you can select a device and view its properties, and launch the device’s
configuration management system in your Web browser.
To configure an Access Point 2000, the device manager must be installed on a
computer that can associate with the access point or is on the same network
segment as the access point, and is running a supported operating system and
Web browser.
■
Launching a Wireless
Device Configuration
3Com 11 Mbps Wireless LAN Access Point 2000 Configuration
Management System—Resides on the Access Point 2000 and lets you
configure that access point through your Web browser. This tool is launched
using the 3Com Wireless Infrastructure Device Manager.
Make sure that the 3Com Wireless Infrastructure Device Manager is installed. The
device to be configured must be connected to power and, depending on its type
(for example, access point or workgroup bridge) it must be either wired to the
network, associating with the wireless network, or, in some cases with the
workgroup bridge, connected directly to the computer. If there is more than one
device with the same name in the network (for example, 3ComWWB), make a
note of the MAC address of the device you want to select so that you can identify
it in the device manager.
1 To launch the device manager, select Start/Programs/3Com Wireless Infrastructure
Device Manager/3Com Wireless Infrastructure Device Manager.
If you have more than one network adapter installed on your computer, you may
be prompted to choose a network adapter. Choose the appropriate adapter and
click OK.
The Wireless Network Tree appears in the 3Com Wireless Infrastructure Device
Manager window. The tree lists all WLAN service areas on the network and
expands to show the 3Com wireless LAN devices that are associated to each
service area. Devices in a different subnet than your computer are identified with
exclamation points (!). You can refresh this display by clicking Refresh. You should
refresh the display, for example, after you change a device IP address.
2 In the Wireless Network Tree, select the device you want to configure.
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CHAPTER 3: CONFIGURING THE ACCESS POINT 2000
If more than one wireless LAN device appears in the tree and you are not sure that
you have selected the right one, click Properties and check the MAC address to
verify that it is the one you want.
3 Click Configure.
If the selected device is on the same subnet as your computer, the configuration
main page appears in your Web browser.
If the selected device is on a different subnet, the device manager helps you to
assign an IP address on the same subnet as your computer. You may accept the
address offered or enter an address and click Next. The next window prompts for
an administrative password to allow the new IP address to be set. If this is the first
time the device is being configured, leave the password field blank and click Next.
The configuration main page appears in your Web browser.
The following table describes the functions of the buttons in the 3Com Wireless
Infrastructure Device Manager window.
Changing Access Point
Properties
Button
Description
Properties
Displays the following properties of the selected device: Device Name, Device
Type, Wireless LAN Service Area (ESSID), IP Address, Subnet Mask, and
MAC Address.
Configure
Launches the configuration for the selected device. If the selected device is on
a different subnet, you are prompted to assign an address on the same subnet
as your computer.
Refresh
Scans the network and displays the connected 3Com 11 Mbps Wireless
LAN devices.
Choose NIC
If your computer has more than one network interface card installed, allows
you to choose which card to use.
Close
Closes the device manager window and ends the session.
Help
Launches the device manager help page in your browser.
Under System Configuration, click Access Point Properties. The Access Point
Properties page displays the properties of the selected access point. You can
change properties by entering values in the fields and clicking the radio buttons
(see the following table). When you are finished, click Save.
The following table describes the properties.
Property
Description
Default Value
Device Name
You can change the default name to one of
your choice.
3Com Access
Point 2000
Device Location
Optionally, you can enter the location of the
access point.
None
WLAN Service Area To enable clients to roam among multiple
3Com
access points, the access points must have
identical WLAN service areas. To maintain
wireless association, the WLAN service area on
the client and the access point with which it is
associated must match exactly. Therefore, if
you are associated with the access point that
you are configuring and you change the access
point WLAN service area, make sure to change
the client WLAN service area also.
Setting Network Properties
Property
Description
Help File Location
■
■
Help File Path
Setting Network
Properties
Access Point Network
Web Server: Help files are located on the
network at the specified Help File Path.
13
Default Value
Local Drive
Local Drive: Help files are located on your
computer at the specified Help File Path.
The location of the Configuration
Management System help files on the web
server or on the local drive.
C:\Program Files\3Com\
3Com Wireless
Infrastructure Device
Manager\Management
Help\AP2000
Under System Configuration, click Network Properties. The Network
Configuration page appears, where you can change the settings described below.
This setting allows you to change the IP address of the access point.
To let the access point get an IP address automatically, click Obtain an IP address
automatically and click Save.
To specify an IP address, click Specify an IP address, enter the IP address
parameters in the spaces provided, and click Save.
If you change the IP address, you cannot continue to configure the access point
using the old IP address. Therefore, if you want to continue configuring this access
point after you save this change, you must do the following:
1 Close your browser.
2 Return to the device manager and click Refresh.
3 Select the access point and click Configure to start a new configuration session.
When you specify an IP address, the access point cannot act as a DHCP server.
Make sure that clients are using IP addresses on the same network.
Wireless DHCP Server
If your wired network has a DHCP server, it is recommended that you use it.
However, the access point provides a DHCP server so that operating systems that
do not support automatic IP addressing can communicate with it.
If a DHCP server does not assign it an IP address, the access point’s default IP
address is 169.254.xxx.1, where xxx is the last byte of the access point’s MAC
address. When it is acting as a DHCP server, the access point can assign up to 253
IP addresses to currently associated wireless clients. The IP addresses range from
169.254.xxx.2 to 169.254.xxx.254.
If the access point detects that another DHCP server is available, all wireless clients
get IP addresses from that DHCP server.
If your wired LAN DHCP server goes down, the access point assigns IP addresses
after the lease periods on the previous IP addresses expire.
To let the access point act as a DHCP server when there is no other DHCP server
available, click Enable and click Save.
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CHAPTER 3: CONFIGURING THE ACCESS POINT 2000
To turn off the access point DHCP server capability regardless of whether or not
another DHCP server is available, click Disable and click Save.
Setting Data
Transmission
Properties
Under System Configuration, click Data Transmission Properties. The Data
Transmission Properties page appears, where you can select radio channel settings
and performance settings.
■
Clear Channel Select—To allow the access point to find a channel
automatically, click the Automatically select the best channel radio button.
When this option is enabled, the access point scans the primary channels to
determine the traffic on those channels and chooses the channel with the least
number of packets.
To select a specific channel, click the Specify the channel check box and choose
a channel from the Channel list.
■
Network Traffic Accelerator—To increase performance, click On (Enhanced
performance). If you experience problems when equipment other than 3Com
11 Mbps Wireless LAN equipment is being used, click Off.
■
Data Preamble—To increase performance, click Short (Enhanced
performance). When equipment that does not support short preamble is also
being used, click Long. To achieve association, wireless device preamble lengths
must match.
When you are finished making your selections, click Save.
Changing Encryption
Settings
Under Security, click Encryption. The Security Setup page appears, where you can
select the type of security to be used on the access point. The access point can be
configured to support one type of security at a time. You can change the settings
by entering values in the fields and clicking the radio buttons. When you are
finished, click Save.
The following sections describe the settings. To maintain wireless association, the
settings on clients and the access points they associate with must match exactly.
No Security (Open
System)
40-bit Shared Key (Wi-Fi)
No encryption is used. The network communications could be intercepted by
unintended recipients.
This option encrypts the wireless transmissions to protect data, but still allows
communication among compatible wireless LAN clients and access points from
third-party manufacturers that are Wi-Fi certified.
This type of security requires you to set up encryption in one of the following
ways:
■
String—For use only with other 3Com 11 Mbps wireless LAN devices, an
encryption string is a case-sensitive string of characters between 6 and 30
characters long. To enter the string, click Enter a string to generate shared keys.
Then type any combination of letters and numbers in the space provided and
click Save.
■
Shared keys—Hexadecimal keys are sequences of hexadecimal digits arranged
into four keys. A hexadecimal digit may be a letter from A to F or a number
Changing the Administration Password
15
from 0 to 9. This type of encryption is compatible with equipment from other
manufacturers that use Wi-Fi certified 40-bit encryption. To enter the keys, click
Specify shared keys and which to use. Then click To specify and select the
shared keys. In the shared keys window, enter all four keys in the provided
spaces, then click a radio button in the Selected Key column to specify which
key to use, and click Save.
128-bit Shared Key
This option can be used with other 3Com 11 Mbps Wireless LAN devices and with
equipment from certain manufacturers that also support 128-bit shared key
encryption. It provides a higher level of security than the 40-bit Shared Key (Wi-Fi)
option and uses a more complicated type of encryption. This type of security
requires you to set up encryption using a string or shared keys as described in
“40-bit Shared Key (Wi-Fi)” on page 14.
Changing the
Administration
Password
Under Tools, click Change Password. The Change Administration Password page
appears, where you can change the administration password for the access point.
Enter the current password and new password in the spaces provided and click
OK.
Using Configuration
Templates
Configuration templates help you to copy standard parameters from one access
point to another. Use of templates makes configuring access points easier and faster
because after you save a template, you can load it to another access point.
Creating a Template
1 Set the basic access point parameters in the System Configuration pages.
If you set specific parameters such as the Device Name or a specific IP address,
these parameters will not be saved in the template.
2 Under Save/Restore Files, click Save Template.
3 In the Save Configuration Template page, click Save Template.
4 Specify a name and location for the template, and click OK.
Loading a Template
1 In the Wireless Network Tree, select an access point and click Configure.
2 Under Save/Restore Files, click Load Template.
3 Click Browse and select the a configuration template to upload to the access
point.
4 Click Load Template.
The configuration template is applied to the access point.
Saving Access Point
Configurations
As part of system maintenance, you should save and back up the configurations of
individual access points in case you need to reload them in the future. The backup
saves all the parameters of the selected access point in a file on your computer.
The file can be used later to restore the access point configuration.
16
CHAPTER 3: CONFIGURING THE ACCESS POINT 2000
The difference between saving a configuration template and creating a backup
configuration is that the configuration template only picks up basic parameters,
which can then be loaded to more than one access point. The backup saves all
parameters and is meant to be loaded to a specific access point.
Backing up an Access
Point Configuration
1 Set the access point parameters in the System Configuration pages.
2 Under Save/Restore Files, click Backup Access Point.
3 In the Backup Access Point Configuration page, click Backup Now.
4 Specify a name and location for the backup, and click OK.
Restoring an Access
Point Configuration
1 In the Wireless Network Tree, select an access point and click Configure.
2 Under Save/Restore Files, click Restore Access Point.
3 In the Restore Access Point page, click Browse and select the backup file to upload
to the access point.
4 Click Restore.
The configuration is restored and activated on the access point.
Viewing System
Status
Upgrading the System
Under System Status, you can view the following information:
■
Click Currently Associated Clients to see a list of the MAC addresses of the
wireless clients currently associating with the access point.
■
Click System Summary to see information about the access point.
You can download firmware updates or updates of the Web server file system (the
files that make up the Configuration Management System) from the 3Com Web site
at http://www.3com.com and install those updates on the access point. To avoid
problems that could occur if a wireless association were interrupted during the
upgrade, it is recommended that you perform the upgrade from a computer that is
wired to the LAN. Make sure the computer is on the same network as the access
points that you are configuring.
If you upgrade both the firmware and the Web server file system, be sure to
upgrade the Web server file system first.
Downloading
Upgrade Files
To locate upgrade files and download them to your computer:
1 Log on to the 3Com Web site at http://www.3com.com.
2 Navigate to the product support page.
3 Navigate to the software download page and locate the files you want to
download.
Restoring an Access Point to Factory Defaults
17
4 Follow the instructions to download the files into a directory on your computer.
Installing an Upgrade
1 In the Wireless Network Tree, select the access point to be upgraded and
click Configure.
2 Under Tools, click Upgrade System.
3 Select the item to upgrade:
To upgrade the Web server file system, click the Configuration System Firmware
radio button.
To upgrade firmware, click the Access Point Firmware radio button.
4 Click Browse, select the upgrade file that you downloaded earlier, and click OK.
If you choose the wrong file, click Clear Entry. The selected file is cleared and you
can browse again for a different file.
5 Click Upgrade.
The upgrade file is copied from your computer to the access point and the access
point restarts using the new upgrade.
Restoring an Access
Point to Factory
Defaults
You can restore access point settings to the defaults that were set at the factory by
inserting a pointed object (such as the point of a straightened paper clip) into the
reset hole on the front near the RJ-45 connector and holding for five seconds.
Interoperating with
Third-Party Equipment
Because 3Com 11 Mbps Wireless LAN equipment complies with IEEE 802.11b
standards, it can interoperate with third-party equipment that also complies with
the standards. However, some third party equipment may not support 3Com
enhanced performance features. You may need to turn off the Network Traffic
Accelerator and set the Data Preamble to long to support this equipment on
the network.
18
CHAPTER 3: CONFIGURING THE ACCESS POINT 2000
4
Diagnosing Problems
TROUBLESHOOTING
If you have difficulty with the access point, try the solutions in the following table.
Symptom
Solutions
Access point does not
power up.
Make sure the power adapter cables are plugged in securely.
Check for a faulty access point power supply.
Check for a failed AC power supply
No operation.
Verify the access point configuration.
Review access point firmware revisions and update firmware
if necessary.
Make sure that there are no duplicate IP addresses on the
network. Unplug the access point and ping the assigned
address to make sure that no other device responds to that
address.
Access point powers up, but
Make sure that the Ethernet cable is plugged in securely.
has no connection to the wired
Verify the network wiring and topology for proper
network.
configuration:
■
■
Access point powers up, but
does not associate with
wireless clients.
Use the provided Ethernet crossover cable. If you use a
standard straight-through (UTP) Ethernet cable, you must
connect to the hub’s uplink (MDIX) port.
Verify that the wireless client is operating correctly.
Confirm that the WLAN service area on the access point
matches that on the clients.
Verify that the clients are operating correctly.
Make sure that security settings on the access point match
those on the clients.
Make sure the preamble lengths match.
Try repositioning the access point to improve reception.
Check the range and move clients closer if necessary.
A client cannot associate with
the access point even though
configuration settings appear
to match.
If the access point is set to find a channel automatically, it
may be choosing a channel that the client does not support.
Set the access point to use a channel within the range
supported by the client.
Slow or erratic performance.
Try changing the wireless channel on the access point.
Check the access point connectors and cabling for
loose connections.
Check the wired network topology and configuration
for malfunctions.
Running on a computer
connected to the wired LAN,
the 3Com Wireless
Infrastructure Device Manager
cannot find an access point.
Make sure that the computer is connected to the same
network segment as the access point.
If your computer has more than one network interface card
installed, make sure you have chosen the right one.
20
CHAPTER 4: TROUBLESHOOTING
Symptom
Solutions
While you are configuring the
access point, the Configuration
Management System stops
responding.
To maintain wireless association, the WLAN service area on
the client and the access point with which it is associated
must match exactly. Therefore, if you are associated with the
access point that you are configuring and you change the
access point WLAN service area, make sure to change the
client WLAN service area to match.
If you change the IP address and save the change, the
browser stops responding. You maintain network
association, but you cannot continue to configure the access
point using the old IP address. Therefore, if you want to
continue configuring this access point after you save this
change, you must do the following:
1 Close your browser.
2 Return to the device manager and click Refresh.
3 Select the access point and click Configure to start a new
configuration session.
After you specify an IP address
for an access point, the device
manager continues to point to
the old IP address when you
select the access point in the
Wireless Network Tree.
In the device manager window click the Refresh button to
refresh the Wireless Network Tree. Then click the access point
in the Wireless Network Tree and click Properties. The IP
address you specified is now listed. If you want to continue
configuring the access point, click Configure.
Your wired LAN DHCP server
malfunctions, but the access
point DHCP server fails to
assign IP addresses.
If the Wireless DHCP Server property on the access point is
enabled, the access point assigns IP addresses after the lease
periods on the previous IP addresses expire. If you want to
force the access point to start assigning IP addresses before
the lease periods expire, unplug the access point from the
power source and plug it back in to reboot it.
The access point stops
Set the access point to obtain an IP address automatically. It
assigning IP addresses after you cannot act as a DHCP server when it has an assigned
assign it an IP address.
IP address.
PC Cards other than 3Com
11 Mbps Wireless LAN PC
Cards cannot communicate
with the access point.
Uninstalling Software
Utilities
The cards may not support the access point’s enhanced
performance features. Try turning the Network Traffic
Accelerator off and setting the Data Preamble to long.
If you want to uninstall the 3Com 11 Mbps Wireless LAN software utilities, you
can either use the standard operating system procedure for removing programs or
use the following shortcut procedure:
1 From the Windows Start menu, select Programs, then 3Com 11Mbps Wireless
LAN, then Uninstall 3Com 11Mbps Wireless LAN.
2 When prompted to confirm, click OK.
WIRELESS LAN BASICS
A
3Com wireless systems let you simply and confidently extend network information
and applications to difficult-to-wire locations and to your mobile workforce,
making your business more productive, competitive and successful.
How Does a Wireless
LAN Work?
Network Association
In a traditional local area network (LAN), computers communicate through wires.
Instead of wires, a wireless LAN uses radio signals to communicate.
Computers that are equipped for wireless LAN communication are called wireless
LAN clients. The wireless communication is called network association. Clients
associate through one or more access points, which are wireless base stations that
act as wireless hubs.
An access point can be connected to a wired network device such as an Ethernet
hub, switch, or router to give clients access to the wired network where they can
share files and printers and gain access to the Internet.
Roaming
If the office space is large, you can set up multiple access points on the same
network to increase coverage. When a wireless client begins to lose the signal as it
moves away from an access point, it can reassociate seamlessly with another
access point. This is called roaming.
Security
You can set up security to encrypt your wireless transmissions so that your data
cannot be deciphered if it is intercepted, and to prevent access to the network by
unauthorized clients.
Ad Hoc Networks
Wireless clients can associate among themselves at close range without an access
point by using ad hoc (temporary) networks. You may wish to set up an ad hoc
network, for example, if a group is working away from the office, or if a group in
the office needs to share files apart from the LAN.
CHAPTER A: WIRELESS LAN BASICS
Setting Up a 3Com
Wireless LAN
All Wireless Networks
The type of network you decide to set up depends on the size of your office and
whether or not you require connection to a wired LAN. You can also set up
security for each of the different types of networks. Your setup will probably
resemble one or more of the following examples. (The illustrations in the examples
show a 3Com Access Point 6000, but they apply to any 3Com 11 Mbps Wireless
LAN access point.)
The simplest 3Com wireless LAN consists of several clients associating in an ad hoc
network without an access point.
PO
W
ET
EL
IR
ER
ES
S
HE
RN
ET
A simple configuration consists of one access point and several clients. The clients
can associate with the wireless network anywhere within the coverage area of the
access point. The access point is not connected to any other network segments.
W
22
For more complex requirements, you can configure several access points as
separate networks at the same site. The access points use different network
identifiers called wireless LAN service areas (WLAN service areas, also called
Extended Service Set Identities or ESSID). Clients can roam within the coverage
areas of access points that have the same WLAN service areas. They cannot roam
to the coverage areas of access points that are configured with different WLAN
service areas.
Wired/Wireless
Networks
An access point can be connected to a wired LAN with an Ethernet cable to create
a mixed wired/wireless network. In this configuration, the access point provides
the link between the wired network and wireless clients. Clients can move freely
throughout the service area of the access point and remain associated with the
larger network for services such as printing and Internet access.
Setting Up a 3Com Wireless LAN
23
EL
ES
W
IR
PO
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ER
ET
S
HE
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ET
EL
IR
W
PO
W
ER
ES
ET
S
HE
RN
ET
Multiple access points can be connected to an existing LAN to provide complete
wireless network coverage. Wireless clients can roam seamlessly between different
access points with the same WLAN service areas and remain associated with the
larger network.
24
CHAPTER A: WIRELESS LAN BASICS
TECHNICAL SUPPORT
B
3Com provides easy access to technical support information through a variety of
services. This appendix describes these services.
Information contained in this appendix is correct at time of publication. For the
most recent information, 3Com recommends that you access the 3Com
Corporation World Wide Web site.
Online Technical
Services
World Wide Web Site
3Com offers worldwide product support 24 hours a day, 7 days a week, through
the following online systems:
■
World Wide Web site
■
3Com Knowledgebase Web Services
■
3Com FTP site
To access the latest networking information on the 3Com Corporation World
Wide Web site enter this URL into your Internet browser:
http://www.3com.com/
This service provides access to online support information such as technical
documentation and software library, as well as support options that range from
technical education to maintenance and professional services.
3Com Knowledgebase
Web Services
This interactive tool contains technical product information compiled by 3Com
expert technical engineers around the globe. Located on the World Wide Web at
http://knowledgebase.3com.com, this service gives all 3Com customers and
partners complementary, round-the-clock access to technical information on most
3Com products.
3Com FTP Site
Download drivers, patches, software, and MIBs across the Internet from the 3Com
public FTP site. This service is available 24 hours a day, 7 days a week.
To connect to the 3Com FTP site, enter the following information into your FTP
client:
■
Hostname: ftp.3com.com
■
Username: anonymous
■
Password: <your Internet e-mail address>
You do not need a user name and password with Web browser software such as
Netscape Navigator and Internet Explorer.
26
APPENDIX B: TECHNICAL SUPPORT
Support from Your
Network Supplier
If you require additional assistance, contact your network supplier. Many suppliers
are authorized 3Com service partners who are qualified to provide a variety of
services, including network planning, installation, hardware maintenance,
application training, and support services.
When you contact your network supplier for assistance, have the following
information ready:
■
Product model name, part number, and serial number
■
A list of system hardware and software, including revision levels
■
Diagnostic error messages
■
Details about recent configuration changes, if applicable
If you are unable to contact your network supplier, see the following section on
how to contact 3Com.
Support from 3Com
If you are unable to obtain assistance from the 3Com online technical resources or
from your network supplier, 3Com offers technical telephone support services. To
find out more about your support options, call the 3Com technical telephone
support phone number at the location nearest you.
When you contact 3Com for assistance, have the following information ready:
■
Product model name, part number, and serial number
■
A list of system hardware and software, including revision levels
■
Diagnostic error messages
■
Details about recent configuration changes, if applicable
Here is a list of worldwide technical telephone support numbers. These numbers
are correct at the time of publication. Refer to the 3Com Web site for updated
information.
Country
Asia, Pacific Rim
Australia
Hong Kong
India
Indonesia
Japan
Malaysia
New Zealand
Pakistan
Philippines
P.R. of China
Singapore
S. Korea
Taiwan, R.O.C.
Thailand
Telephone Number
1 800 678 515
800 933 486
+61 2 9242 5179 or
000800 6501111
00 531 616 439
03 5783 1270
1800 801 777
0800 446 398
+61 2 9937 5083
1235 61 266 2602
10800 61 00137 or
021 6350 1590 or
00800 0638 3266
800 6161 463
02 3455 6455 or
00798 611 2230
0080 611 261
001 800 611 2000
Or, send a description of the problem by email to: apr_technical_support@3com.com
Support from 3Com
Country
Europe, Middle East and Africa
From anywhere in these regions, call:
Telephone Number
+44 (0)1442 435529 phone
+44 (0)1442 436722 fax
Europe and South Africa
From the following countries, you may use the toll-free numbers:
Austria
Belgium
Denmark
Finland
France
Germany
Hungary
Ireland
Israel
Italy
Luxembourg
Netherlands
Norway
Poland
Portugal
South Africa
Spain
Sweden
Switzerland
U.K.
0800 297468
0800 71429
800 17309
0800 113153
0800 917959
0800 1821502
06800 12813
1800 553117
1800 9453794
800 8 79489
0800 23625
0800 0227788
800 11376
00800 3111206
0800 831416
0800 995014
900 983125
020 795482
0800 55 3072
0800 966197
Latin America
Brazil
Mexico
Puerto Rico
Central and South America
0800 13 3266
01 800 849CARE
800 666 5065
AT&T +800 998 2112
North America
1 800 NET 3Com (1 800 638 3266)
Enterprise Customers:
1 800 876-3266
27
28
APPENDIX B: TECHNICAL SUPPORT
Returning Products
for Repair
Before you send a product directly to 3Com for repair, you must first obtain an
authorization number. Products sent to 3Com without authorization numbers will
be returned to the sender unopened, at the sender’s expense. To obtain an
authorization number, call or fax:
Country
Telephone Number
Fax Number
Asia, Pacific Rim
+65 543 6500
+65 543 6348
Europe, South Africa, and
Middle East
+31 30 6029900
+31 30 6029999
Central and South America
525 201 0075
Argentina
Bolivia
Brazil
0810 222 3266
511 241 1691
0800 133266 or
55 11 5643 2700
525 201 0004
562 240 6200
525 201 0004
525 201 0004
525 201 0004
525 201 0004
511 241 1691
525 201 0004
525 201 0004
Caribbean
Chile
Colombia
Ecuador
Mexico
Paraguay
Peru
Uruguay
Venezuela
From the following countries, you may call the toll-free numbers; select option 2 and
then option 2:
Austria
Belgium
Denmark
Finland
France
Germany
Hungary
Ireland
Israel
Italy
Netherlands
Norway
Poland
Portugal
South Africa
Spain
Sweden
Switzerland
U.K.
0800 297468
0800 71429
800 17309
0800 113153
0800 917959
0800 1821502
06800 12813
1800553117
1800 9453794
800 879 489
0800 0227788
800 11376
00800 3111206
0800 831416
0800 995014
900 983125
020 795482
0800 55 3072
0800 966197
U.S.A. and Canada
1 800 NET 3Com
(1 800 638 3266)
Enterprise Customers:
1 800 876 3266
REGULATORY COMPLIANCE INFORMATION
FCC RADIO-FREQUENCY
EXPOSURE NOTICE
This device generates and radiates radio-frequency energy. In order to comply with FCC radio-frequency radiation exposure
guidelines for an uncontrolled environment, this equipment has to be installed and operated while maintaining a minimum
body to antenna distance of 20 cm.
This product does not contain any user serviceable components. Any unauthorized product changes or modifications will
invalidate 3Com’s warranty and all applicable regulatory certifications and approvals.
FCC PART 15 NOTICE
(APPLICABLE TO USE WITHIN
THE USA)
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may
not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause
undesired operation.
WARNING: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part
15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential
installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance
with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that
interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television
reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
■
Reorient or relocate the receiving antenna.
■
Increase the separation between the equipment and receiver.
■
Connect the equipment into an outlet on a circuit different from the one which the receiver is connected to.
■
Consult the dealer or an experienced radio/TV technician for help.
The user may find the following booklet prepared by the Federal Communications Commission helpful:
The Interference Handbook
This booklet is available from the U.S. Government Printing Office, Washington, D.C. 20402. Stock No. 004-000-00345-4.
MANUFACTURER’S
DECLARATION OF
CONFORMITY
3Com Corporation
5400 Bayfront Plaza
P.O. Box 58145
Santa Clara, CA 95054-8145
(408) 326-5000
Declares that the product:
Date:
5 December 2001
Brand Name:
3Com Corporation
Model Number:
WL-308
Equipment Type:
Wireless LAN Access Point
Complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: (1) this device may not cause
harmful interference, and (2) this device must accept any interference received, including interference that may cause
undesired operation.
3Com Corporation WL-308
Tested to Comply
With FCC Standards
FOR HOME OR OFFICE USE
INDUSTRY CANADA NOTICE
(APPLICABLE TO USE WITHIN
CANADA)
This Class B digital apparatus complies with Canadian ICES-003.
AVIS DE CONFORMITÉ À LA
RÉGLEMENTATION
D’INDUSTRIE CANADA
Cet appareil numérique de la classe B est conform à la norme NMB-003 du Canada.
To prevent radio interference to the licensed service, this device is intended to be operated indoors and away from windows to
provide maximum shielding. Equipment (or its transmit antenna) that is installed outdoors is subject to licensing.
Pour empêcher que cet appareil cause du brouillage au service faisant l'objet d'une licence, cet appareil doit être utilisé à
l'intérieur seulement et devrait être placé loin des fenêtres afin de fournir un écran de blindage maximal.
EUROPEAN COMMUNITY - CE
NOTICE
Marking by the symbol:
indicates compliance with the essential requirements of Directive 73/23/EC and the essential requirements of articles 3.1(b), 3.2
and 3.3 of Directive 1999/5/EC. Such marking is indicative that this equipment meets or exceeds the following
technical standards:
■
EN 300 328-2 - Electromagnetic compatibility and Radio spectrum Matters (ERM); Wideband Transmission systems; data
transmission equipment operating in the 2,4 GHz ISM band and using spread spectrum modulation techniques
■
ETS 300 826 - Electromagnetic compatibility and Radio spectrum Matters (ERM); ElectroMagnetic Compatibility (EMC)
standard for 2,4 GHz wideband transmission systems and HIgh PErformance Radio Local Area Network (HIPERLAN)
equipment
■
EN 60950 - Safety of information technology equipment, including electrical business equipment.
Marking by the symbol:
indicates that this product cannot be used in France.
SAFETY COMPLIANCE NOTICE
This device has been tested and certified according to the following safety standards and is intended for use only in Information
Technology Equipment which has been tested and certified to these or other equivalent standards:
■
UL Standard 1950 / CSA C22.2 No. 950
■
IEC 60950
■
EN 60950
Published February, 2002
User Guide Version 1.0.3
INDEX
Numbers
128-bit Shared Key 15
3Com 11 Mbps Wireless LAN Access
Point 2000 Configuration 11
3Com Knowledgebase Web Services 25
3Com Wireless Infrastructure Device
Manager 11
40-bit Shared Key (Wi-Fi) security 14
E
N
encryption 14
keys 14
string 14
Extended Service Set Identity (ESSID) 22
network 21
ad hoc 21, 22
traffic settings 14
network association, defined 21
network supplier support 26
NIC, choosing 12
No Security 14
F
A
access point 21
changing properties 12
configuration templates 15
IP address 13
changing 13
DHCP server 13
troubleshooting 20
maintaining configurations 15
placement 7
restoring factory defaults 17
ad hoc network 21, 22
adapter, choosing 12
administration password, changing 15
administration tool 7, 11
association 21
B
backup 15
base station 21
C
changing passwords 15
choosing a NIC 12
clients, wireless, defined 21
configuration 11, 12, 22
ad hoc, defined 22
examples 22
factory defaults 7
maintenance for access points 15
templates 15
Configure button 12
connection (association) 21
D
data preamble 14, 17, 20
Data Transmission Properties 14
device manager 11
device, configuring 12
DHCP server 13, 20
factory defaults, restoring 17
firmware upgrade 16
G
O
online technical services 25
open system 14
guidelines, security 14
H
hexadecimal keys 14
I
installation 7
access point 7
firmware 16
requirements 7
interoperating with third-party
equipment 17
IP address
DHCP server 13
refreshing after changing 11
specifying 13
troubleshooting 20
P
password, changing administrator 15
performance settings 14
placement, access point 7
preamble 14, 17, 20
product registration 5
Properties button 12
R
radio signal interference, causes 7
Refresh button 12
registration 5
restoring access point settings to factory
defaults 17
returning products for repair 28
roaming, defined 21
K
S
keys 14
security 21
128-bit Shared Key 15
40-bit Shared Key (Wi-Fi) 14
guidelines 14
no security 14
server, DHCP 13
service area, defined 22
set up, wireless LAN 22
settings, radio channel 14
shared keys 14
L
LAN, wireless 21
launching the device manager 11
LED 8
locating devices 11, 12
M
MAC address, use in locating
devices 11, 12
T
technical support
3Com Knowledgebase Web
Services 25
network suppliers 26
product repair 28
templates, configuration 15
third-party interoperability 17
troubleshooting 19
access point firmware 16
U
upgrading access point firmware 16
W
warranty, registration 5
wireless 5, 21
association (connection) 21
clients, defined 21
wireless LAN 21
wireless LAN service area 22
wireless network tree 11
WLAN service area 22
World Wide Web (WWW) 25
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