3Com 3CRWE870075A - Wireless LAN Access Point... Manuel utilisateur

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User Guide

Wireless LAN Access Points 8200/8500/8700

3CRWE820096A

3CRWE850075A

3CRWE870075A

Version 2

Published May, 2003

Version 2.1.3

3Com Corporation

5500 Great America

Parkway

Santa Clara, California

95052-8145

reproduced in any form or by any means or used to make any derivative work (such as

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notiﬁcation of such revision or change.

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conditions of merchantability, satisfactory quality, and ﬁtness for a particular purpose. 3Com

may make improvements or changes in the product(s) and/or the program(s) described in this

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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

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UNITED STATES GOVERNMENT LEGEND

If you are a United States government agency, then this documentation and the software

described herein are provided to you subject to the following:

All technical data and computer software are commercial in nature and developed solely at

private expense. Software is delivered as “Commercial Computer Software” as deﬁned in DFARS

252.227-7014 (June 1995) or as a “commercial item” as deﬁned in FAR 2.101(a) and as such is

provided with only such rights as are provided in 3Com’s standard commercial license for the

Software. Technical data is provided with limited rights only as provided in DFAR 252.227-7015

(November 1995) or FAR 52.227-14 (June 1987), whichever is applicable. You agree not to

remove or deface any portion of any legend provided on any licensed program or

documentation contained in, or delivered to you in conjunction with, this User Guide.

Unless otherwise indicated, 3Com registered trademarks are registered in the United States and

may or may not be registered in other countries.

3Com, the 3Com logo, and SuperStack are registered trademarks of 3Com Corporation.

Wi-Fi is a trademark of the Wireless Ethernet Compatibility Alliance.

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 Features 6

Security 7

Performance and Reliability 7

Manageability 7

Wireless Network Standards 8

Far-Reaching 802.11b 8

High-Performance 802.11a 8

Network Conﬁguration and Planning 9

Ad Hoc Wireless LAN 9

Infrastructure Wireless LAN 10

Infrastructure Wireless LAN for Roaming Wireless PCs 11

Terminology 11

Installing the Access Point

Installation Requirements 13

Power Requirements 14

Safety Information 14

Deciding Where to Place Equipment 15

Before You Begin 16

Connecting the Standard Antennas 16

Connecting Power 17

Using the Power Supply 18

Using a Power-Over-Ethernet LAN Port 19

Checking the LEDs 19

Mounting on a Wall 19

Flat Surface Installation 21

Selecting and Connecting a Different Antenna Model 22

Installing Software Utilities 23

System Conﬁguration

Using the 3Com Wireless Device Manager 24

Launching a Wireless Device Conﬁguration 24

Using the Pre-IP Conﬁguration Wizard 26

Conﬁguration Login 26

Setting the Country Code 26

Basic Setup 27

Advanced Setup 27

Identiﬁcation 28

TCP/IP Settings 28

DHCP Client 28

Secure Web Server Connection 28

RADIUS 29

Authentication 30

Filter Control 31

Filtering by VLAN 32

Security Filters 32

Filtering by Ethernet Protocol Type 32

SNMP 33

Administration 33

System Log 34

Status 35

Radio Interface 35

Radio Settings 35

Security 37

Conﬁguring Authentication 37

Conﬁguring Encryption 38

WPA Conﬁguration 38

WEP Conﬁguration 39

WPA Conﬁguration for Windows XP 40

Troubleshooting

Technical Support

Online Technical Services 45

Support from Your Network Supplier 45

Support from 3Com 46

Returning Products for Repair 47

Regulatory Compliance Information

Index

NTRODUCTION

The 3Com® Wireless LAN Access Points 8200, 8500, and 8700 offer a

dual-mode architecture that supports both 802.11a and 802.11b wireless users

on a single device. This means you can mix and match radio bands to meet

different coverage and bandwidth needs within the same area. Different access

point models give you the ﬂexibility to choose to support both radio modes

immediately or choose one radio mode now and upgrade to newer standards

later as they become available with an easy-to-install optional Mini PCI

upgrade kit.

With their ﬂexibility and unfettered access, wireless LANs are changing the way

people work. Now with 3Com’s enterprise-class wireless access points, you can

build a cost effective, reliable, secure wireless network that provides users with

seamless connectivity to the Internet, company intranet, and the wired corporate

network from anywhere they happen to be—conference room, cafeteria or

ofﬁce.

3Com’s dual-mode design supports both 802.11a and 802.11b wireless

standards on a single access point. This capability increases conﬁguration and

coverage ﬂexibility and protects your network investment for both existing and

emerging wireless standards.

Industry-leading security features and comprehensive management and

performance features combine to make these enterprise class wireless access

points an ideal choice for organizations ready to serve their increasingly mobile

workforce.

RODUCT

EATURES

■

Access Point 8200

—Creates an enterprise-class wireless LAN supporting up

to 250 simultaneous users. The single wireless interface 802.11b 2.4 GHz,

11-Mbps access point upgrades to 802.11b-802.11a dual mode with optional

upgrade kit.

■

Access Point 8500—

Creates a high-performance enterprise-class wireless

LAN supporting up to 250 simultaneous users. The single wireless interface

802.11a 5 GHz, 54-Mbps access point upgrades to 802.11b-802.11a dual

mode with optional upgrade kit.

■

Access Point 8700

—Creates a high-performance enterprise-class dual-mode

802.11a and 802.11b wireless LAN supporting up to 250 simultaneous users

up to 100 meters (328 feet).

ECURITY

3Com offers one of the most robust suite of standards-based security on the

market today. To protect sensitive data broadcast over the wireless LAN, 3Com

supports Wireless Equivalent Privacy (WEP) RC4 40/ 64-bit, 128-bit and 152-bit

shared-key encryption. 3Com strengthens this basic security mechanism with

additional security features, including MAC address access control lists, IEEE

802.1x per-port user authentication with RADIUS server authentication support,

Temporal Key Integrity Protocol (TKIP), Wireless Protected Access and Extensible

Authentication Protocol (EAP) support: EAP-MD5, EAP-TLS, EAP-TTLS, and PEAP.

In addition to standards-based security, 3Com 128-bit Dynamic Security Link

offers the highest level of security, requiring a user name and password to access

the wireless LAN.

ERFORMANCE

AND

ELIABILITY

3Com wireless access point performance features ensure reliable and seamless

connections for users wherever they roam. Automatic channel selection

automatically ﬁnds the least loaded channel for interference-free communication.

Auto network connect and dynamic rate shifting keep users connected through a

wide variety of conditions by changing to the optimum connection speed as they

move through the network.

ANAGEABILITY

3Com offers a wide range of standards-based management support, from SNMP

to 3Com Network Supervisor and HP OpenView for seamless integration with

your wired network.

Wireless Infrastructure Device Manager and Wireless LAN Device Discovery tools

let you conﬁgure parameters, run diagnostics, and monitor performance from

anywhere on the network using an embedded web server browser. You can also

update wireless device software on multiple devices using 3Com Network

Supervisor to simplify bulk updates.

With Power over Ethernet (PoE) support, the same Category 5 cable that

connects your access point to the data network also provides its power. A single

cable installation dramatically improves your choice of mounting conﬁgurations

because you no longer need to consider AC power outlet locations. PoE support

makes it easier than ever to overcome installation problems with difﬁcult-to-wire

or hard-to-reach locations.

IRELESS

ETWORK

TANDARDS

Understanding the characteristics of the 802.11a and 802.11b standards can help

you make the best choice for your wireless implementation plans.

-R

EACHING

802.11

802.11b operates in the 2.4 GHz band at 11 Mbps. Ratiﬁed in 1999, it’s the most

widely deployed protocol in the market today due to the Wi-Fi Alliance’s

successful certiﬁcation efforts that have ensured interoperability. It supports the

widest coverage—up to 100 meters (328 feet). However, 802.11b is slower than

802.11a and it is subject to a greater risk of radio interference because it operates

in the more popular 2.4 GHz band.

Consider 802.11b when you need wider coverage and vendor compatibility and

you are:

■

Implementing a complete wireless LAN solution, including bridges, gateways,

access points and clients; Wi-Fi certiﬁcation guarantees compatibility

among vendors

■

Managing a tight budget; 802.11b is extremely price competitive with a wide

range of vendors and price points

■

Providing access to hot spots in public spaces such as coffee shops or

university cafeterias

■

Running applications that don’t require high bandwidth

IGH

-P

ERFORMANCE

802.11

Ratiﬁed in 2002, 802.11a is IEEE’s more recent wireless standard. It operates at

the 5 GHz band and supports data rates at up to 54 Mbps. For those

organizations demanding even higher speeds, a “turbo mode” feature can boost

throughput rates up to 108 Mbps. And because there are fewer devices in the

5 GHz band, there’s less potential for RF interference. However, because it is at an

entirely different radio spectrum, it is not compatible with 802.11b.

The higher spectrum provides about 50 meters (164 feet) of coverage—about

half what 802.11b offers.

Consider 802.11a when you need high throughput in a conﬁned space and

you are:

■

Running high-bandwidth applications like voice, video, or multimedia over a

wireless network that can beneﬁt from a ﬁvefold increase in data throughput

■

Transferring large ﬁles like computer aided design ﬁles, preprint publishing

documents or graphics ﬁles, such as MRI scans for medical applications, that

demand additional bandwidth

■

Supporting a dense user base conﬁned to a small coverage area. Because

802.11a has a greater number of non-overlapping channels, you can pack

more access points in a tighter space.

ETWORK

ONFIGURATION

AND

LANNING

The wireless solution supports a stand-alone wireless network conﬁguration as

well as an integrated conﬁguration with 10/100 Mbps Ethernet LANs.

The wireless network cards, adapters, and access point can be conﬁgured as:

■

Ad hoc for departmental or SOHO LAN

■

Infrastructure for wireless LAN

■

Infrastructure wireless LAN for roaming wireless PCs

IRELESS

LAN

An ad hoc wireless LAN consists of a group of computers, each equipped with a

wireless adapter, connected via radio signals as an independent wireless LAN.

Computers in a speciﬁc ad hoc wireless LAN must therefore be conﬁgured to the

same radio channel. An ad hoc wireless LAN can be used for a branch ofﬁce or

SOHO operation.

NFRASTRUCTURE

IRELESS

LAN

The access point can also provide access to a wired LAN for wireless workstations.

An integrated wired/wireless LAN is called an infrastructure conﬁguration. A Basic

Service Set (BSS) consists of a group of wireless PC users, and an access point that

is directly connected to the wired LAN. Each wireless PC in this BSS can talk to any

computer in its wireless group via a radio link, or access other computers or

network resources in the wired LAN infrastructure via the access point.

The infrastructure conﬁguration not only extends the accessibility of wireless PCs

to the wired LAN, but also increases the effective wireless transmission range for

wireless PCs by passing their signal through one or more access points.

A wireless infrastructure can be used for access to a central database, or for

connection between mobile workers, as shown in the following ﬁgure.

Ad Hoc Wireless LAN

Notebook with

Wireless USB Adapter

Notebook with

Wireless PC Card

PC with Wireless

PCI Adapter

File

Server

Switch

Desktop PC

Access Point

Wired LAN Extension

to Wireless Adapters

PC with Wireless

PCI Adapter

Notebook with Wireless

PC Card Adapter

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