3Com WL-311 Manuel utilisateur

Wireless Building-to-Building Bridge

WL-311

Wireless Network Solution

User Guide

http://www.3com.com/

http://www.3com.com/productreg

Published June 2001

User guide version 1.0.0

3Com Corporation ■5400 Bayfront Plaza ■Santa Clara, California ■95052-8145 ■U.S.A.

Assembled in the USA.

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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

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Microsoft, Windows, and Windows NT are registered trademarks of Microsoft Corporation. Wi-Fi is a trademark of the Wireless Ethernet

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All other company and product names may be trademarks of the respective companies with which they are associated.

Contents

1Introduction

Point-to-Point Topology 1

Point-to-Multipoint Topology 2

Antennas and Cables 3

Omnidirectional Antenna 3

Flat-panel Directional Antenna 3

Selecting an Antenna 4

Antenna Options 4

Selecting a Cable 4

Cable Options 4

2Installing the Hardware and Software

Wireless Bridge Kit Contents 5

System Requirements 5

Physical Dimensions 6

LED Indicators 7

Bridge Placement Considerations 7

Indoor Location 7

Outdoor Location 7

Considering Antenna Placement 8

Proper Grounding 8

Alignment 8

Polarization 8

Installing the Hardware 9

Installing the Wireless Bridge Manager Software 11

3Configuring the Bridge

Starting the Bridge Manager 13

Scanning for Bridge Groups 14

Selecting a Bridge to Configure 15

Setting Network and Security Values 16

Network Settings 17

Security Settings 18

40-bit Shared Key Encryption Settings 19

128-bit Shared Key 21

Setting Network Transmission Options 23

Setting the Transmit Rates 24

Setting Medium Reservation 24

Setting the Channel 24

Contents

4Using System Tools and Viewing Information

Accessing System Tools 25

Saving and Loading Configurations 26

Saving a Configuration 26

Loading a Configuration 27

Resetting the Unit 27

Resetting the Unit to Factory Defaults 28

Using the Reset to Default Icon 29

Resetting by Using the Configuration Button 29

Updating the Bridge Firmware 30

Setting the Password 32

Using the Log Viewer 33

Event Log 33

Forward Table 34

Association Log 35

Viewing Signal Strength with the RSSI Monitor 36

Long Term Statistics 37

Moving Window Statistics 37

Viewing System Information 37

5Troubleshooting Bridge Problems

Upgrading Firmware 39

Diagnosing Problems 39

Handling Event Log Errors 40

Handling Terminal Configurator Error Codes 40

ATechnical Specifications

Supported Standards 41

Network Standard 41

Network Architecture Types 41

Network Connection Type 41

Bridging Protocol 41

Encryption 41

Security 41

Power Specifications 41

Available Transmit Power Settings 41

Radio Specifications 42

Frequency Band 42

Range 42

Wireless Medium 42

Media Access Protocol 42

Modulation 42

Operating Channels 42

Nonoverlapping Channels 42

Sensitivity and Data Rate 42

Receive Sensitivity 42

Data Rates Supported 42

Contents

Configuration and Management Features 42

Local Configuration 42

Remote Configuration Support 42

Dimensions 43

Environmental 43

BUsing the Terminal Configurator

Establishing a Direct Serial Connection 45

Establishing a Telnet Connection 46

Using the Terminal Configurator 47

Main Menu Overview 47

Edit Configuration Menu Overview 48

Using The Editor 48

Configuration File Format 48

File Contents 49

System 49

[configure] 49

[bridge] 49

Bridged Ethernet (lan0) 49

[hardware] 49

[encryption] 50

[rmp] 50

[bootp] 50

[ip] 51

Error Codes 51

Index

Limited Warranty and Regulatory Compliance Information

3Com Corporation Limited Warranty

Regulatory Compliance Information

1Introduction

The 3Com Wireless Building-to-Building Bridge lets you wirelessly connect previously

isolated, wired networks scattered across a campus of buildings. You can extend the reach

of any number of wired LANs without needing to physically lay cable between the

buildings that house them.

A wireless local area network (WLAN), can be an extension or alternative to a wired

network within a building or campus. Data is transmitted and received across the WLAN

using radio waves instead of cable. In a wireless LAN environment, no cabling is needed

between nodes for data communication. The 3Com Wireless Building-to-Building Bridge

provides a way to extend the scope of the wireless LAN far beyond the walls of a particular

building.

A 3Com Wireless Building-to-Building Bridge can be used in two network configurations,

or topologies:

■Point-to-point communication

■Point-to-multipoint communication

This guide explains these network topologies and their components, and leads you

through the process of installing, configuring, and administering the 3Com Wireless

Building-to-Building Bridge.

Point-to-Point Topology

Point-to-point topology is the simplest way to use your 3Com Wireless Building-to-

Building Bridge. Two wireless bridges form a link between the wired LANs in two separate

buildings, as shown in the figure below. This topology typically uses only directional

antennas for communication between the two bridges (see “Antennas and Cables”

on page 3).

1Introduction

Point-to-Multipoint Topology

3Com Wireless Building-to-Building Bridges can be used for communicating among

multiple (two or more) bridges, with each bridge connected to a particular building’s wired

LAN. The next figure shows a bridging network in which four 3Com Building-to-Building

Bridges are used to provide wireless connectivity among four buildings. This topology

typically uses omnidirectional antennas for communication between bridges if bridging is

desired among all buildings in the bridging network without restriction (see “Antennas

and Cables” on page 3).

In this configuration, the wireless bridges make all four wired LANs appear to be

connected by the same Ethernet cable. Using wireless bridges in this manner provides a

cost-effective way to wirelessly link multiple wired LAN networks by eliminating the need

to install cables between buildings.

An alternative point-to-multipoint configuration is shown in the following figure.

In this example, the first building’s bridge is using an omnidirectional antenna while the

other three buildings have bridges using directional antennas. In this case, the three

bridges with directional antennas can communicate only with the bridge using the omni-

direction antenna; they cannot communicate directly with each other. The bridge using

the omnidirectional antenna can communicate with the other three bridges.

CAUTION: This alternative, mixed-antenna point-to-multipoint topology, can

possibly result in lower performance than a point-to-multipoint configuration that

uses only omnidirectional antennas.

Antennas and Cables

You can connect the following types of antennas to the 3Com Wireless Building-to-

Building Bridge:

■Flat-panel directional

■Omnidirectional

For best performance, place each antenna outdoors using the mounting hardware

provided with the antenna. Outdoor placement is especially important if the building

consists of metal construction or has metal siding. If necessary, you can mount an antenna

inside a building; however, indoor placement reduces the antenna’s effective range.

The following figures illustrate the different types of antennas and typical examples of use.

See Chapter 2, “Installing the Hardware and Software,” for detailed information about

recommended 3Com antennas.

Omnidirectional Antenna

An omnidirectional antenna provides short-range, point-to-multipoint connectivity for two

or more wireless bridges. Range with an omnidirectional antenna is approximately 1300

meters at 11 megabits per second (Mbps).

Flat-panel Directional Antenna

A flat-panel directional antenna provides long-range, point-to-point connectivity between

two wireless bridges. Range can be as high as 4.1 kilometers (km) at 11 Mbps.

1Introduction

Selecting an Antenna

The following table shows guidelines for selecting antennas based upon their gain

properties (expressed in decibels (dB)). The gain of any antenna is essentially a

specification that quantifies how well that antenna is able to direct the radiated radio

frequency (RF) energy into a particular direction. Thus, high-gain antennas direct their

energy more narrowly and precisely, and low-gain ones direct energy more broadly.

The range estimates listed are those that can be expected between two 3Com Wireless

Building-to-Building Bridges using the listed antenna combinations.

Antenna Options

The following 3Com antennas are available for use with the 3Com Wireless Building-to-

Building Bridge:

■3CWE490 4 dB Omnidirectional

■3CWE491 8 dB Omnidirectional

■3CWE495 13 dB Bidirectional Panel

■3CWE496 18 dB Directional Panel

Selecting a Cable

Specific cables are available from 3Com for connecting the wireless bridge to an antenna.

In planning your bridging topology, it is important to account for signal attenuation due

to the cable and connectors used between the bridge and the antenna. Using the shortest

cables possible reduces signal loss.

3Com recommends using 50-ft cable with 18 dB antenna (with 10 dB attenuation) for

typical installations.

Cable Options

The following 3Com cables are available for use with the 3Com Wireless Building-to-

Building Bridge:

■3CWE480A — 6 ft

■3CWE481A — 20 ft

■3CWE482A — 50 ft

Gaina

Antenna A

a.Gain is shown in dB

Gain

Antenna B

Distance

(Meters)

Distance

(Miles) Antenna Types

4 4 522 0.3 Omni-to-omni

4 8 827 0.5 Omni-to-omni

8 8 1,311 0.8 Omni-to-omni

4 13 1,471 0.9 Omni-to-panel

4 18 2,616 1.6 Omni-to-panel

8 13 2,332 1.4 Omni-to-panel

8 18 4,146 2.6 Omni-to-panel

13 13 4,146 2.6 Panel-to-panel

13 18 3,695 2.3 Panel-to-panel

18b

b.18 dB antenna typically paired with 50-ft cable accessory

18 3,293 2.0 Panel-to-panel

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