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User Guide

Wireless LAN Outdoor Bridge Solution

3CRWEASY96A

Complete Building-to-Building Outdoor Wireless LAN Kit

Published February, 2003

Document Version 1.2.0

3Com Corporation

5500 Great America

Parkway

Santa Clara, California

95052-8145

Copyright © 2003 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 implied or expressed, including, but not limited to, the implied warranties, terms or

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

documentation at any time.

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

or!LICENSE.TXT. If you are unable to locate a copy, 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, 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

1

Introduction

Basic Network Topologies 7

Point-to-Point 7

Point-to-Multipoint 8

Basic Operating Modes 9

2

Installing the Outdoor Bridge

Installation Requirements 10

Power Requirements 10

Administration Requirements 11

Installation Guidelines 11

Proper Grounding 11

Alignment 12

Polarization 12

Restrictions on Antenna Use 12

Safety Information 13

Mounting the Bridge to a Mast 14

Connecting the Bridge to the LAN 15

Using the Power Supply 15

Using a Power-Over-Ethernet LAN Port 15

Installing Software Utilities 16

Establishing Wireless Association 17

3

Configuring the Building-to-Building Bridge

Using the 3Com Wireless Device Manager 18

Launching a Wireless Device Configuration 18

Using the Pre-IP Configuration Wizard 20

Using the RSSI Monitor 20

Saving Configuration Changes 21

Changing System Properties 21

Setting IP Network Properties 22

Setting up Protocol and Port Filtering 23

Setting Wireless Network Properties 24

Setting Advanced Performance Properties 26

Setting up an Ad Hoc Network 28

Optimizing an Ad Hoc Installation 29

Setting up an Access Point Infrastructure Network 30

Changing Security Settings 31

No Security (Open System) 32

40-bit Shared Key (Wi-Fi) 32

128-bit Shared Key 33

128-bit Dynamic Security Link 33

Setting up the Wireless Network Login 33

Resetting the Bridge 33

Restoring a Bridge to Factory Defaults 34

Upgrading the System 34

Changing the Administration Password 35

Backing up a Configuration 35

Restoring a Configuration 36

Viewing the Client List 36

Resetting Statistics Listings 37

Clearing the Client List 37

Viewing Connection Status 37

Viewing the System Summary 37

Interoperating with Third-Party Equipment 37

4

Troubleshooting

Diagnosing Problems 38

Disconnecting the Bridge 40

Uninstalling Software and Documentation 40

Upgrading Bridge Firmware 40

A

Technical Support

Online Technical Services 41

Support from Your Network Supplier 42

Support from 3Com 42

Returning Products for Repair 43

Regulatory Compliance Information

Index

7

1

I

NTRODUCTION

The 3Com® Wireless LAN Outdoor Bridge Solution is a comprehensive

building-to-building outdoor wireless LAN kit that reduces the need to evaluate,

purchase and assemble separate components. One convenient package includes

everything you need to offer an easy-to-manage building-to-building wireless

LAN. The package features a 3Com Wireless LAN Building-to-Building Bridge with

integrated antenna and power-over-Ethernet cable in a durable,

weatherproof enclosure.

This all-in-one wireless LAN solution delivers three to four times the bandwidth of

T1 links, with significantly lower operational costs. The wireless bridge lets you

connect cross-campus buildings, or portable or temporary classrooms, at

distances up to 16 kilometers (10 miles), where local regulations allow. The

building-to-building bridge interoperates seamlessly with other Wi-Fi certified

access points in large multi-vendor environments.

B

ASIC

N

ETWORK

T

OPOLOGIES

The 3Com bridge can be used in two types of wireless network topologies:

■

Point-to-point

■

Point-to-multipoint

P

OINT

-

TO

-P

OINT

Point-to-point topology is the simplest way to use the 3Com bridge, and it offers

the highest performance level. Two 3Com outdoor bridges form a direct wireless

8

association between the wired LANs in two remote buildings. See the following

diagram of the point-to-point topology.

P

OINT

-

TO

-M

ULTIPOINT

Point-to-multipoint topology allows communication among three or more

buildings. In the central building, an access point equipped with an

omnidirectional antenna provides wireless association among the wired LANs in

the other buildings where 3Com outdoor bridges are installed.

If a 3Com 11 Mbps Wireless LAN Access Point 8000 is used (with an 8dBi

omnidirectional antenna) this topology can connect wired LANs over distances up

to 10 kilometers (6 miles). If an access point from another Wi-Fi compliant

manufacturer is used, the range depends on that manufacturer’s device

limitations.

9

B

ASIC

O

PERATING

M

ODES

Two operating modes relate to the basic WLAN topologies:

■

Ad hoc mode is the basis for point-to-point topology. Operating in ad hoc

mode, two outdoor bridges can associate without an access point, allowing

the LANs to which they are connected to communicate.

■

Access Point (Infrastructure) mode is the basis for point-to-multipoint

topology. Operating in access point mode, multiple 3Com outdoor bridges act

as clients to an Access Point 8000 or a Wi-Fi compliant access point from

another manufacturer.

10

2

I

NSTALLING

THE

O

UTDOOR

B

RIDGE

This equipment must be installed in compliance with local and national building

codes, regulatory restrictions, and FCC rules. For the safety of people and

equipment, only professional network personnel should install the bridge, cables,

and antennas.

I

NSTALLATION

R

EQUIREMENTS

The following items are required for installation:

■

For a point-to point configuration, two 3Com outdoor bridges.

■

For a point-to-multipoint configuration, one 3Com 11Mbps Wireless LAN

Access Point 8000 (or other Wi-Fi compliant access point) with an

omnidirectional antenna for one building, and one 3Com outdoor bridge for

each other building.

■

Mounting hardware (supplied with each bridge).

■

Properly grounded outdoor mast or wall mount.

■

Lightning arrestor properly grounded at each building in the topology.

■

Outdoor rated category 5 Ethernet cable (3Com part number

3CWE487 recommended).

P

OWER

R

EQUIREMENTS

The bridge complies with the IEEE 802.3af power-over-Ethernet standard. It

receives power over outdoor rated Ethernet cable (3Com part number 3CWE487

recommended). Installation requires the use of either the 3Com power supply

provided or IEEE 802.3af compliant power supply equipment (output power rated

48 V dc @ 200 mA minimum). Such equipment must b

e

safety certified according

to UL, CSA, IEC or other applicable national or international safety requirements

CAUTION

: Before installing, see the important warnings and cautions in “Safety

Information” on page 13.

11

for the country of use. All references to the power supply in this document refer

to equipment that meets these requirements.

Because the power supply plug is the only means of disconnecting the bridge

from power, make sure the power outlet is accessible.

See “Using the Power Supply” on page 15 and “Using a Power-Over-Ethernet

LAN Port” on page 15.

A

DMINISTRATION

R

EQUIREMENTS

To use the administration tool, which helps you select 3Com wireless LAN devices

and launch their configuration management systems, you need a computer

running one of the following operating systems and one of the

following browsers:

I

NSTALLATION

G

UIDELINES

The 3Com outdoor bridge is housed in a durable, waterproof enclosure and is

specifically designed for outdoor use in most climates. Optimal performance can

be maintained at outdoor temperature ranges from -20˚ C to 50˚C (-4˚F to 122˚F).

It is extremely important to avoid mounting the bridge in any area where it could

be vulnerable to extreme or hazardous conditions of any kind. Nor should the unit

be mounted flush with the roof of a building.

P

ROPER

G

ROUNDING

To ensure the physical safety of anyone near the bridge and to prevent damage to

the unit, follow the building codes for antenna installations in your area. Make

certain that bridges and masts are appropriately grounded to prevent injury and

Note for use of the 3Com power supply (part number 61-0107-000) in Norway:

This product is also designed for use on an IT power system with phase-to-phase

voltage of 230 V.

Operating Systems

Windows XP

Windows 2000

Windows NT 4.0

Windows Me

Windows 98

Browsers

Netscape 6.0 or later

Internet Explorer 5.0 or later

12

minimize damage from lightning strikes. A lightning arrestor, properly grounded

and installed at each building in the topology, will protect networking equipment

in the building, as well as the people working there, from lightning-induced

surges that travel on Ethernet cables.

A

LIGNMENT

Position bridges so that they are aimed at each other wherever possible. While

maintaining a direct line of sight between antennas helps to ensure a strong

signal, it is not strictly necessary, nor is it always possible. Conditions such as long

distances, mountainous regions, and architectural barriers could make a direct

line of sight nearly impossible to achieve.

In a campus setting, where buildings are short distances apart, and especially in a

point-to-point configuration, align each unit to point at the antenna with which it

will communicate. If you place two units at different heights, tilt them up or

down toward each other for optimal signal strength.

P

OLARIZATION

Polarization is a physical phenomenon of radio signal propagation. In general, any

two antennas that are to communicate with each other must be set for the same

horizontal or vertical polarization. If polarization on both antennas does not

match—a situation called

cross-polarization

—the link will either work poorly or

not at all. Follow these polarization guidelines:

■

Vertical polarization is preferred for point-to-multipoint configuration.

■

For point-to-multipoint configurations, the omnidirectional antenna

connected to the access point should be vertically aligned in relation to

the ground.

■

Unidirectional antennas that link with omnidirectional antennas should always

be oriented for vertical polarization.

R

ESTRICTIONS

ON

A

NTENNA

U

SE

The following restrictions apply to the use of the bridge’s 18 dBi antenna:

■FCC regulations require that in the United States, use of channels 12 and 13 in

conjunction with an 18 dBi antenna is allowed only at very reduced power,

which the 3Com unit sets automatically.

■The highest allowable power level is set automatically when the country

selection is made from the pulldown menu in the configuration tool.

■To work properly with 18 dBi antennas, bridges must be separated by at least

61 Meters (200 Feet).

13

SAFETY INFORMATION

WARNING: Do not install the bridge near overhead power lines, electric light or

power circuits, or where it can come into contact with such circuits. Provide ten

feet or more clearance between the bridge and such power lines or circuits. Do

not install the bridge flush with the rooftop or wall. When installing the bridge, do

not come into contact with such circuits, which can cause serious injury or death.

Follow local and national codes for proper installation and grounding of antennas.

WARNING: To comply with FCC radio frequency (RF) exposure limits, antennas

should be located at least two meters (six feet) or more from the bodies of

all persons.

WARNING: Do not install the bridge or connect and disconnect cables during

periods of lightning activity.

WARNING: To avoid possible injury or damage to equipment, you must use either

the provided power supply or IEEE 802.3af compliant power supply equipment

that is safety certified according to UL, CSA, IEC, or other applicable national or

international safety requirements for the country of use. All references to power

supply in this document refer to equipment meeting these requirements.

WARNING: It is the responsibility of the installer to ensure that the

Power-over-Ethernet (POE) power supply is properly connected. Connection to any

other device, such as a standard Ethernet card or another POE supply, may result

in permanent damage to equipment, electric shock, or fire. Refer to the

installation instructions for proper installation.

WARNING: The 3Com power supply (part number 61-0107-000) input relies on a

16A rated building fuse or circuit protector for short circuit protection of the line

to neutral conductors.

CAUTION: A lightning arrestor will not prevent damage from direct lightning

strikes. It is extremely important to ensure that the bridge is installed at least 1

meter (3 feet) below the top of the grounded pole or mast.

CAUTION: If you supply your own Ethernet cable for connecting power, be sure

that it is outdoor rated category 5 straight-through (8-wire) cable that has not

been altered in any way (3Com part number 3CWE487 recommended). Use of

nonstandard cable could damage the bridge.

CAUTION: Minimize damage from direct lightning strikes by mounting the bridge

at least 1 Meter (3 feet) below the top of the mast.

14

MOUNTING THE BRIDGE TO A MAST

The bridge can be placed in any suitable outdoor location (see “Installation

Guidelines” on page 11). Refer to the adjustable mount instruction sheet that

comes with the bridge mounting hardware, and the illustrations below:

Make sure that all bridges

are properly oriented for

polarization as described

in “Polarization” on

page 12. Use the

polarization indicators on

the antenna panel to

guide orientation. VERT

POL indicates vertical

polarization and HORIZ

POL indicates horizontal

polarization.

15

CONNECTING THE BRIDGE TO THE LAN

You can connect to the LAN either through the 3Com power supply or through

IEEE 802.3af power-over-Ethernet compliant equipment.

USING THE POWER SUPPLY

The power supply can be located indoors at any point between the bridge and

the LAN access port where an accessible power outlet exists.

Connect the cable coming from the bridge to the port labeled To Access Point on

the power supply.

Connect another Ethernet cable from the port labeled To Hub/Switch on the

power supply to an Ethernet LAN port, as shown.

USING A POWER-OVER-ETHERNET LAN PORT

If your LAN equipment complies with the IEEE 802.3af power-over-Ethernet

standard, you can connect the bridge directly to a LAN port. For example, the

CAUTION: To avoid damaging network equipment, make sure that the cables

are connected from bridge to power supply to LAN as shown and

described above.

16

illustration shows the connection through a 3Com Ethernet Power Supply to a

3Com SuperStack® Switch.

INSTALLING SOFTWARE UTILITIES

The 3Com installation CD includes the Wireless Infrastructure Device Manager

tool, which helps you set up and administer the wireless components of your

network. It also contains documentation, including the help files for device

configuration screens.

To install the tool and documentation from the CD:

1Power up the computer and insert the 3Com CD in the CD-ROM drive.

2The setup menu should appear when the CD autostarts. If no menu appears,

you can run the startup program from the Windows Start menu:

Start/Run/d:setup.exe (where d: is the CD-ROM drive)

3From the menu, select Install the Tools and Documentation. This option

installls the 3Com Wireless Infrastructure Device Manager (WIDMAN) Tool,

which you can use to monitor bridges and select devices for administrative

changes. It also installs the User Guide in HTML and PDF formats.

4Follow the instructions on the screen.

17

ESTABLISHING WIRELESS ASSOCIATION

After the bridge and software utilities are installed, you can configure the bridge

as follows:

■Launch the bridge configuration. (See “Configuring the Building-to-Building

Bridge” on page 18 for details on how to launch the configuration and

make changes.)

■For a point-to-point association between two bridges, see “Setting up an Ad

Hoc Network” on page 28 and “Optimizing an Ad Hoc Installation” on

page 29.

■For a point-to-multipoint association between an access point and one or

more bridges, see “Setting up an Access Point Infrastructure Network” on

page 30.

18

3CONFIGURING THE

BUILDING-TO-BUILDING BRIDGE

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 configure the

bridge through your Web browser.

The 3Com Wireless Infrastructure Device Manager helps you locate 3Com

wireless LAN devices on the network, select a device and view its properties, and

launch the device’s configuration in your Web browser. To configure a bridge, the

device manager must be installed on a computer that has an Ethernet adapter

and is running a supported Windows operating system and Web browser.

USING THE 3COM WIRELESS DEVICE MANAGER

After the 3Com Wireless Device Manager is installed, ensure that the device to be

configured is either wired to the network, associating with the wireless network,

or connected directly to the computer, and connected to power. If more than one

device using the factory default name is connected, make a note of the MAC

address of the device you want to select so that you can identify it in the

device manager.

LAUNCHING A WIRELESS DEVICE CONFIGURATION

If you do not have a DHCP server on your network, it can take up to one minute

for a device to become discoverable after it has been powered up.

1To launch the 3Com Device Manager, select Start /Programs /3Com

Wireless/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

19

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.

2In the Wireless Network Tree, select the device you want to configure.

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.

3Click Configure.

■If the selected device is on the same subnet as your computer, the

Configuration Management System main page appears in your Web

browser. (If a password is set on the device, enter it when prompted.)

■If the selected device is on a different subnet, the Pre-IP Configuration

Wizard is activated automatically. This wizard lets you configure the IP

settings for the selected wireless device. It proposes IP address and subnet

mask settings derived from your computer’s settings, so the selected device

will then reside on the same subnet as your computer. You can accept the

suggested settings or change them as required. For more information, see

“Using the Pre-IP Configuration Wizard” on page 20.

The next window prompts for an administrative password to allow the new IP

address to be set. When the units are shipped from the factory, there is no

administration password and you should leave the password field blank. If an

administration password has been set for the device, enter the password and

click Next. The 3Com Web Configuration Management System main screen

appears in your Web browser.

The following table describes the functions of the buttons in the 3Com Wireless

Infrastructure Device Manager window.

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 Management System 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 you want to use.

Close Closes the device manager window and ends the session.

Help Launches the device manager help page in your browser.

20

USING THE PRE-IP CONFIGURATION WIZARD

You can only configure devices that are on the same subnet as your computer. To

configure a device on a different subnet, you must first assign it an IP address on

the same subnet as your computer. After you launch the configuration, you can

change settings as usual. Just before you finish, you must change the device IP

address back to its original setting.

Follow this procedure:

1In the Wireless Infrastructure Device Pre-IP Configuration window, accept the

suggested settings or change them as required. You can assign a static IP

address or specify that the device obtain its IP address from a DHCP server.

2The next window prompts for an administrative password. When the units

are shipped from the factory, there is no administration password and you

should leave the password field blank. If an administration password has

been set for the device, enter the password and click Next.

The Configuration Management System main page appears in your

Web browser.

USING THE RSSI MONITOR

The device manager can display a dynamic graphical representation of a device’s

received signal strength indication (RSSI). By monitoring the RSSI while making

antenna adjustments, you can ensure optimal device placement and orientation.

To monitor signal strength, the devices must be set to the same BSSID and RSSI

broadcasting must be enabled.

The following procedure uses the device manager RSSI Monitor to monitor the

signal strength of two 3Com bridges:

1In the device manager window, launch the first bridge configuration and

configure for ad hoc mode.

Enable RSSI broadcasting as follows:

aIn the main menu under System Configuration, click Wireless Network.

bIn the Wireless Network page, click the link to go to advanced wireless

network configuration.

cIn the Advanced Wireless Network page, click the Broadcast RSSI On radio

button, and click Save.

dNote the device BSSID.

In the main configuration menu under System Status, click

Connection Status. The status window shows the BSSID.

21

2Return to the device manager and repeat step 1 for the second bridge. Make

sure that both bridges are using the same BSSID.

If the bridges are not using the same BSSID, specify the BSSID on both bridges

as follows:

aIn the Wireless Network page, select the following Network Mode: Ad-hoc

(Peer-to-Peer) Specify.

bEnter the BSSID in the spaces provided.

cClick Save.

3After you have enabled RSSI broadcasting on both bridges and verified that

they are using the same BSSID, return to the device manager, select the first

bridge, and click Properties.

4In the device properties window, click RSSI Monitor.

The RSSI Monitor window shows a graphical representation of bridge signal

strength. A value of 30 indicates good strength; a value of 40 or above is very

good. By adjusting the antenna position and orientation, you can improve the

signal strength.

SAVING CONFIGURATION CHANGES

Most pages in the configuration have two buttons: Save and Clear. After making

changes on a page, you must click Save to store the modifications before moving

to a new page. If you make a mistake, click Clear before saving to restore the original

page settings.

To reduce the possibility of losing wireless association with an access point while

you are configuring, security settings are stored when you click Save in the

security pages, but they do not take effect until you click Save in the Wireless

Network page. First configure security settings. Then go to the Wireless

Network page and configure wireless network settings, including the Wireless

LAN Service Area. The security settings take effect after you click Save in the

Wireless Network page.

CHANGING SYSTEM PROPERTIES

Under System Configuration, click System Properties. The System Properties page

displays the properties of the selected device. You can modify properties by

entering values in the fields and clicking the radio buttons. When you are

finished, click Save. The following table describes the properties and default

values.

22

SETTING IP NETWORK PROPERTIES

Under System Configuration, click IP Network. The IP Network Properties page

appears, where you can change the following settings. When you are finished,

click Save.

■IP Network Setting—This setting allows you to change the device IP address.

To let the device get an IP address automatically from a DHCP server, click

Obtain an IP address automatically.

Property Description Default Value

Device Name This name appears in the System Summary window. You

can change the default name to one of your choice.

3Com Bldg-to-Bldg Bridge

Device Location Optionally, you can enter a location to identify where the

device is installed. (For example, Building 4, Cubicle 3.)

None

Help File Location ■Web Server: Help files are located on the network at

the specified Help File Path.

■Local Drive: Help files are located on the local

computer at the specified Help File Path.

Local Drive

Help File Path The location of the Configuration Management System

help files on the web server or on the local drive.

If you want to have access to help when you click the ? in

the configuration pages, you must install the help from

the 3Com CD. By default, help is installed on the local

drive when you install the administration tool. If you

install the help in a different location on the local drive or

on a web server, you must set the Help File Path to the

correct location.

C:/Program

Files/3Com/3Com Wireless

Infrastructure Device

Manager/ManagementHelp/

B2B

Secure Web Server

Connection

Controls whether Secure Socket Layer (SSL) technology is

used to encrypt information between the computer and

the bridge during a configuration session. When this

option is turned on, data is protected during the

configuration session. When it is turned off, data could

be intercepted during the configuration session.

Changing this option causes the bridge to reset, which

disrupts the network association temporarily, but does

not affect bridge configuration settings that have already

been saved. To ensure that changes to security settings

are retained, either change this option before changing

security settings, or click Save in the Wireless Network

page after changing security settings and before

changing this option.

Off

23

To specify an IP address, click Specify an IP address, enter the IP address

parameters in the spaces provided.

After you change the IP address and click Save, you cannot continue to

configure the device using the old IP address. To continue configuring this

device after making this change, you must do the following:

aClose your browser.

bReturn to the 3Com Wireless Infrastructure Device Manager and

click Refresh.

cSelect the device and click Configure to start a new configuration session.

■IP Address, Subnet Mask, Gateway IP Address—Parameters for use when

you click Specify an IP address. Enter the parameters in the spaces provided.

SETTING UP PROTOCOL AND PORT FILTERING

Protocol filtering allows you to control the types of protocols that the bridge is

authorized to transmit and receive. The default setting allows the following

protocols to be transmitted and received:

■IPX

■NetBEUI

■UDP/IP

■TCP/IP

To set up a list of authorized protocols:

1Under System Configuration, click Protocol Filtering.

2In the Protocol Filtering page, click the Allow radio buttons next to the

protocols that you want to authorize. Click the Block radio buttons next to

the protocols that you want to disable.

3Click Save.

If UDP/IP or TCP/IP protocols are authorized, you can set up port filtering, which

allows you to control the protocol ports that are authorized to transport packets

through the bridge. The default setting allows all protocol ports to

transport packets.

The bridge allows you to filter up to 100 protocol port numbers. Valid protocol

port numbers range from 1 to 65535.

24

To set up protocol port filtering:

1Under System Configuration, click Protocol Filtering.

2In the Protocol Filtering page, click the Allow radio button next to the UDP/IP

or TCP/IP protocol (or click both buttons).

3Select the Port Filtering Mode:

Allow—If you want to block most protocol ports and allow a small number

of others, use the Allow mode. Click the Allow radio button.

Block—If you want to allow most protocol ports and block a small number of

others, use the Block mode. Click the Block radio button.

4Enter a protocol port number in the space provided and click Save.

Repeat this step for all the protocol port numbers you want to allow or block.

To view the list of protocol ports or delete protocol ports from the list:

1Click the link to view the protocol port list.

2In the next page, click the check boxes next to the protocol port numbers and

click Delete. (You may click Reset to clear all check boxes before

clicking Delete.)

SETTING WIRELESS NETWORK PROPERTIES

Under System Configuration, click Wireless Network Properties. The Wireless

Network Properties page appears, where you can configure the items listed below

and get access to advanced performance settings. When you are finished,

click Save.

■Network Mode—Click Access Point (Infrastructure) to associate with an

access point. Click Ad-hoc (Peer-to-Peer) to associate in ad hoc mode. Click

Ad-hoc (Peer-to-Peer) Specify if you want to specify the bridge’s basic service

set identification (BSSID).

■BSSID—When the network mode is Ad-hoc (Peer-to-Peer) Specify, you can

specify the BSSID. Enter the BSSID in the spaces provided.

■Wireless LAN Service Area—This is the device ESSID. The default WLAN

service area name is 3Com. You can use the default, enter a WLAN service

area, or select one from the list

Saving wireless network properties also causes security settings to take effect.

After making changes to security settings, you must click Save in the Wireless

Network Properties page to activate the security settings.

25

To maintain wireless association, the WLAN service area on a bridge and the

device with which it is associated must match exactly. Therefore, if the bridge

is set to specify the WLAN service area and you change the other device’s

WLAN service area, make sure to change the bridge WLAN service area also.

■Access Point Privacy Mode—This mode only applies when the network

mode is Access Point (Infrastructure) and should only be used when access

points are set with privacy enabled. (On 3Com access points, privacy is

enabled when the Broadcast WLAN Service Area Name (ESSID) mode is

disabled.) Click On to associate with access points set with privacy mode

enabled. Click Off to associate with access points set with privacy mode

disabled. When privacy mode is on, you must specify a Wireless LAN Service

Area, which must match the access point service area exactly.

■Channel Selection—When the network mode is Access Point (Infrastructure),

this option is set to Automatically select the best channel, and cannot be

changed. In this case, the bridge uses the channel that the access point

is using.

When the network mode is Ad-hoc (Peer-to-Peer) you can specify channel

selection as follows:

■Automatically select the best channel—When this option is enabled,

the bridge scans the primary channels. If the bridge is establishing a new

ad hoc network, it chooses the channel with the least number of packets.

If the bridge is joining an existing ad hoc network, it selects the channel

in use.

■Specify the channel to use—To establish the channel for an ad hoc

network, select this option on the first bridge and choose a channel from

the Channel list. On the second bridge, set the channel selection to match

the first bridge.

■Country Selection (Outdoor Bridge only)—Select the country from the

pull-down list. The highest allowable power level is automatically set.

■Antenna Selection (Indoor Bridge only)—When you select a valid country,

antenna, and cable combination, the highest allowable power level is set

automatically.

Select the country from the pull-down list.

Click the radio buttons next to the antenna and cable being used.

Antenna model 3CWE496 (18 dBi) is not available in some countries. In the

United States, use of channels 12 and 13 in conjunction with model

3CWE496 is not allowed. The following table summarizes these and other

FCC regulations require that in the United States, use of channels 12 and 13 in

conjunction with an 18 dBi antenna is allowed only at very reduced power,

which the 3Com bridge sets automatically.

26

restrictions. Y indicates the power level that is set automatically; N indicates

that a combination is not allowed.

SETTING ADVANCED PERFORMANCE PROPERTIES

Under System Configuration, click Wireless Network. On the Wireless Network

Properties page, click the link to go to advanced wireless network configuration.

The Advanced Wireless Network page appears, where you can change the

settings listed below. When you are finished, click Save.

■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 (Wi-Fi

Interoperable).

■Data Preamble—To increase performance, click Short (Enhanced

performance). When equipment that does not support short preamble is also

being used, click Long (Wi-Fi Interoperable).

■Flow Control—When there is a great deal of traffic on the wireless LAN, flow

control can prevent bridge input buffers from overflowing, thereby increasing

WLAN reliability. The bridge supports IEEE 802.3x asymmetric outgoing flow

control, allowing it to pause the transmission of data frames from a switch or

router that is operating in full-duplex mode and supports 10/100

Country

Cable

Length

Antenna:

4dBi 8 dBi 13 dBi 18 dBi

Power (dBm): Power (dBm): Power (dBm): Power (dBm):

18 13 7 18 13 7 18 13 7 18 13 7

Argentina, Brazil, Canada,

Colombia, India,

Malaysia, Mexico, New

Zealand, Peru, Taiwan

6 Y Y Y Y

20 Y Y Y Y

50 Y Y Y Y

United States 6 Y Y Y Y*

20 Y Y Y Y*

50 Y Y Y Y*

All Other Countries

(except China)†

6 NY NY NNYNNN

20 N Y N Y N N Y N N N

50 Y Y Y Y N N N

* Channels 12 and 13 not allowed when using 18 dBi antenna in the United States.

† Countries where transmit power is limited to 100 mW (20 dBm). In China, transmit power is limited to less than 10 mW.

27

auto-negotiation. To enable flow control, click On. To disable flow control,

click Off.

■Acknowledgement Delay—This setting determines the length of time the

bridge waits for an acknowledgement after transmitting packets. When the

delay time has passed, the bridge resends the packets. A longer

acknowledgement delay allows the bridge to associate with another wireless

device over a greater distance. Set the delay to match the distance between

the bridge and the wireless device with which it is associated. Click the radio

button next to the appropriate distance range.

■Client Limit—Allows you to specify the maximum number of clients that the

bridge allows to associate at the same time (from 1 to 1024). The default is

256 clients. In Access Point (Infrastructure) mode, set the Client Limit to match

the number of clients that the access point can support.

To ensure network reliability, follow these guidelines for configuring the

access point:

■Make sure that the access point can support more than the number of

clients that you expect to use the wireless LAN.

■The client list timeout setting should be as short as possible, but no less

than five minutes.

■Data Rates—These settings configure the data rates used for wireless

transmissions. By default, the bridge selects the best data rate for the

current connection.

You may not alter the settings for the 1Mbps and 2Mbps rates because these

rates must always be available to transmit certain types of wireless traffic.

The 5.5 Mbps and 11 Mbps data rates may either be Required or Optional.

When the data rate is set to Optional, the bridge determines if it is

appropriate to use that data rate or if the signal strength requires the use of a

lower data rate. If the data rate is set to Required, the bridge cannot

modulate to a lower data rate, and may lose connection with clients that

cannot support the higher data rate.

■Broadcast RSSI—This setting determines whether the device’s received signal

strength indication (RSSI) is broadcast. When RSSI broadcasting is enabled, you

can use the device manager or the Connection Status page to monitor the

signal strength. To enable RSSI broadcasting, click On. To disable RSSI

broadcasting, click Off.

28

SETTING UP AN AD HOC NETWORK

Operating in ad hoc mode, two bridges can establish a point-to-point association

without an access point, allowing two LANs to communicate.

1Install the first bridge.

2Use the 3Com Wireless Infrastructure Device Manager to select the first

bridge and launch its configuration management system.

3Configure security settings.

Security settings default to No Security (Open System). Optionally, you can set

shared key security as described in “40-bit Shared Key (Wi-Fi)” on page 32 or

“128-bit Shared Key” on page 33. (The 128-bit Dynamic Security Link option

is not available in ad hoc mode.)

4Under System Configuration, click Wireless Network.

(Wireless Network properties are described in “Setting Wireless Network

Properties” on page 24.)

5In the Wireless Network page:

aIn the Network Mode field, click Ad-hoc (Peer-to-Peer).

bSpecify the Wireless LAN Service Area.

cSpecify the Channel Selection.

To avoid the possibility of interference from other nearby wireless devices,

specify the channel to use.

dClick Save to save the wireless network settings and activate the

security settings.

eClick the link to go to advanced wireless network configuration.

6In the Advanced Wireless Network page, set options as described in “Setting

Advanced Performance Properties” on page 26.

7When you are finished, click Save.

8End the browser session.

9Install the second bridge and repeat the procedure. Make sure to configure

settings to match the first bridge exactly. When you are finished, click Save

and end the browser session.

To ensure correct operation, the settings on the two bridges must match exactly.

To avoid the possibility of losing wireless association while you are configuring, it

is recommended that you configure with a computer that is wired to the LAN.

To ensure a successful association, install and configure the bridges sequentially.

29

OPTIMIZING AN AD HOC INSTALLATION

You can optimize an ad hoc installation by adjusting antenna positions slightly to

improve the radio signal between bridges. The following tools help you to

optimize the installation:

■The device manager can display a dynamic graphical representation of the

bridge’s received signal strength indication (RSSI). By monitoring the RSSI while

making antenna adjustments, you can ensure optimal placement.

■The configuration Connection Status page displays the bridge’s basic service

set identification (BSSID) and a static RSSI value that you can refresh as

needed.

■The configuration Wireless Network page allows you to specify a BSSID,

if necessary.

To monitor signal strength, the bridges must be set to the same BSSID and RSSI

broadcasting must be enabled. In the factory default configuration, the BSSID is

generated automatically and RSSI broadcasting is disabled.

To use the device manager RSSI Monitor:

1Install the Wireless Infrastructure Device Manager (version 1.2.0.9 or later)

from the 3Com installation CD.

2Launch the device manager (Start /Programs /3Com Wireless/Wireless

Infrastructure Device Manager).

3In the device manager window, launch the first bridge configuration and

configure for ad hoc mode.

Enable RSSI broadcasting as follows:

aIn the main menu under System Configuration, click Wireless Network.

bIn the Wireless Network page, click the link to go to advanced wireless

network configuration.

cIn the Advanced Wireless Network page, click the Broadcast RSSI On radio

button, and click Save.

dNote the bridge BSSID.

In the main configuration menu under System Status, click

Connection Status. The status window shows the BSSID.

4Return to the device manager and repeat step 3 for the second bridge. Make

sure that both bridges are using the same BSSID.

If the bridges are not using the same BSSID, specify the BSSID on both bridges

as follows:

aIn the Wireless Network page, select the following Network Mode: Ad-hoc

(Peer-to-Peer) Specify.

30

bEnter the BSSID in the spaces provided.

cClick Save.

5After you have enabled RSSI broadcasting on both bridges and verified that

they are using the same BSSID, return to the device manager, select the first

bridge, and click Properties.

6In the device properties window, click RSSI Monitor.

The RSSI Monitor window shows a graphical representation of bridge signal

strength. A value of 30 indicates good strength; a value of 40 or above is very

good. By adjusting the antenna position, you can improve the signal strength.

You can also monitor signal strength through a status page in the configuration

as follows:

1Launch the bridge configuration.

2In the main configuration menu under System Status, click

Connection Status.

3The status window shows the RSSI value. Click Refresh to update the value

each time you adjust the antenna position.

SETTING UP AN ACCESS POINT INFRASTRUCTURE NETWORK

Operating in Access Point (Infrastructure) mode, one or more bridges can

establish a point-to-multipoint association with an access point, allowing the

LANs to which they are connected to communicate.

1Use an omnidirectional antenna atop the central building. Attach the antenna

to an access point inside the building. Install 3Com outdoor bridges or indoor

bridges with sector-panel directional antennas for the other buildings.

If a 3Com 11 Mbps Wireless LAN Access Point 8000 is used (with an 8 dBi

omnidirectional antenna), wired LANs can be connected over distances of up

to 10 kilometers (6 miles).

2Use the 3Com Wireless Infrastructure Device Manager to select the first

bridge and launch its configuration management system.

3Configure security settings. The bridge security settings must match those on

the access point.

Security settings default to No Security (Open System). Optionally, you can set

up the following types of security:

Configure the access point before configuring the bridges.

31

Shared key —See “40-bit Shared Key (Wi-Fi)” on page 32 or “128-bit

Shared Key” on page 33.

Password—If you are using a 3Com Access Point 8000, you can set up

password security as described in “128-bit Dynamic Security Link” on

page 33.

4Under System Configuration, click Wireless Network.

5In the Wireless Network page:

aIn the Network Mode field, click Access Point (Infrastructure).

bSpecify the Wireless LAN Service Area as described in “Setting Wireless

Network Properties” on page 24.

cClick Save. This saves the wireless network settings and activates the

security settings.

dClick the link to go to advanced wireless network configuration.

In the Advanced Wireless Network page, set the Client Limit option to match

the number of clients that the access point can support. (See Client Limit

under “Setting Advanced Performance Properties” on page 26.) To ensure

network reliability, follow these guidelines for configuring the access point:

Make sure that the access point can support more than the number of clients

that you expect to use the wireless LAN.

The client list timeout setting should be as short as possible, but no less than

five minutes.

6When you are finished, click Save.

7End the browser session.

8Repeat the procedure with the other bridges. Make sure you configure bridge

settings to match exactly. When you are finished, click Save and end the

browser session.

CHANGING SECURITY SETTINGS

Under System Configuration, click Security Settings. The Security Settings page

appears, where you can select the type of security to be used on the bridge. The

bridge can be configured to support one type of security at a time. You can

change the settings by clicking the radio buttons and entering values in the fields.

After saving security settings, you must go to the Wireless Network Properties

page and click Save to activate the security settings.

32

When you are finished, click Save. Then go to the Wireless Network Properties

page, set the Wireless LAN Service Area, and click Save. Security settings take

effect only after you click Save in the Wireless Network Properties page.

Although the bridge is allowed to associate with an access point set for a

different level of encryption, data authentication is not allowed. Therefore, data

cannot pass between the bridge and the access point unless their security settings

match exactly.

The following sections describe the security settings. To maintain wireless

association, the settings on clients and the access points they associate with (or

other members of an ad hoc network) must match exactly.

NO SECURITY (OPEN SYSTEM)

No encryption is used. The network communications could be intercepted by

unintended recipients.

40-BIT SHARED KEY (WI-FI)

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 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 key to use. Then click the link to

specify and select the shared keys. In the shared keys window, enter all the

If you are configuring through a wireless association (not on the wired LAN), be

sure to configure security settings before changing the WLAN service area. If you

change the WLAN service area first, the bridge will lose association with one

access point before it is configured to associate with another.

33

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 above

in “40-bit Shared Key (Wi-Fi)” on page 32.

128-BIT DYNAMIC SECURITY LINK

This option can only be used with other 3Com 11 Mbps Wireless LAN devices

when the bridge is set to the Access Point (Infrastructure) network mode. It is the

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

wireless LAN. The user name and password set up on the bridge must match

those set up on the access point. Each network session creates a unique,

one-time encryption code.

If you choose this type of security, you must also set up a login as described in

“Setting up the Wireless Network Login” on page 33.

SETTING UP THE WIRELESS NETWORK LOGIN

If you configure a bridge for 128-bit Dynamic Security Link, you must also set up

a login user name and password, which must match a listing in the access point

user access list. In the Security Settings page, click 128-bit Dynamic Security Link.

Then click the link to modify the wireless network login. In the Wireless Network

Login page, enter a login name and password, and confirm the password in the

spaces provided. When you are finished, click Save.

RESETTING THE BRIDGE

If the bridge stops responding correctly, you can perform a reset, which disrupts

the network association temporarily, but does not affect bridge configuration

Make sure the access point does not require Windows user authentication. The bridge

cannot associate with access points that are set to Require Windows user

authentication, which requires clients to enter a user name and password every

time they associate with the network.

34

settings that have already been saved. To reset the bridge, under Tools, click Reset

Wireless Building-to-Building Bridge. In the next Web page, click Reset.

RESTORING A BRIDGE TO FACTORY DEFAULTS

You can restore bridge settings to the defaults that were set at the factory as

follows:

1Under Tools, click Restore Factory Defaults.

2Click Restore.

Manual Restore (indoor bridge only)—To restore the settings manually, insert

a pointed object (such as the end of a straightened paper clip) into the reset hole

on the front near the RJ-45 connector and hold for approximately 15 seconds.

If the bridge was using an IP address setting other than the default, restoring the

factory defaults will change the IP address. If you want to continue configuring

the bridge, do the following:

1Close your browser.

2Return to the 3Com Wireless Infrastructure Device Manager and click

Refresh.

3Select the device and click Configure to start a new configuration session.

UPGRADING THE SYSTEM

You can download firmware and configuration management system upgrades

from the 3Com Web site and install those upgrades on the bridge.

The upgrade procedure requires a Trivial File Transfer Protocol (TFTP) server. The

bridge acts as a TFTP client to receive the download.

To locate an upgrade file and download it to your computer:

1Log on to the 3Com Web site at http://www.3com.com.

2Navigate to the product support page for the 3Com Wireless LAN Outdoor

Bridge Solution to access the download files and instructions.

3Follow the instructions to download the file into a directory on your

computer.

4Copy or move the file to the TFTP server upload/download directory.

35

To install an upgrade:

1Use the 3Com Wireless Infrastructure Device Manager to select the device

and launch its configuration.

2Under Tools, click Upgrade System.

3Enter the name of the upgrade file that you downloaded earlier.

4Enter the IP address of the TFTP server where the upgrade file is located.

5Click Upgrade.

The upgrade file is copied from the TFTP server to the bridge. The bridge

restarts using the new upgrade.

CHANGING THE ADMINISTRATION PASSWORD

The first time you launch the Configuration Management System on the device or

after you reset a device to factory defaults, you are prompted to set an

administration password. Although a password is not required, 3Com

recommends that you set a password to protect against unauthorized access.

After you set the password, you must enter it each time you launch the

configuration for the device. A user name is not required.

Under Tools, click Change Administration Password. The Change Administration

Password page appears, where you can change the administration password for

the device. Enter the current password and new password in the spaces provided

and click Save.

BACKING UP A CONFIGURATION

As part of system maintenance, you should save and back up the configurations

of individual bridges in case you need to reload them in the future. The backup

saves all the parameters of the selected bridge in a file on your computer. The file

can be used later to restore the configuration on this or another bridge.

1Set the bridge parameters in the System Configuration pages.

2Under Tools, click Backup Wireless LAN Building-to-Building Bridge.

3In the next page, click Backup Now.

4Specify a name and location for the backup, and click OK.

36

RESTORING A CONFIGURATION

If you have stored a backup configuration on your computer, you can restore the

configuration as follows:

1Under Tools, click Restore Wireless LAN Building-to-Building Bridge.

2In the next page, click Browse and select the backup file to upload to the

bridge.

3Click Restore.

The configuration is restored and activated on the bridge. This operation may

cause the bridge to reboot.

If the bridge was using an IP address setting other than the backup, restoring the

configuration will change the IP address. If you want to continue configuring the

bridge, do the following:

1Close your browser.

2Return to the 3Com Wireless Infrastructure Device Manager and click

Refresh.

3Select the device and click Configure to start a new configuration session.

VIEWING THE CLIENT LIST

Under System Status, click Ethernet Client List. The Ethernet Client List page

appears, where you can view the following information:

■Ethernet Clients—Lists the client MAC addresses. The bridge supports up to

1024 specific clients. When the list reaches its limit, new clients replace

inactive clients (status Not Associated).

■# Transmitted Packets—The number of packets that the client has

transmitted.

■# Received Packets—The number of packets that the client has received.

■Association Status—One of the following:

Initializing—A new client is preparing to associate.

Associated—The client is active on the network.

Not Associated—The client is inactive.

The client list can be up to 10 pages long. Each page lists 100 clients. You can

search for a specific MAC address on the current page using your browser’s Find

function. To display another page, click a page number in the list at the top of the

current page.

37

RESETTING STATISTICS LISTINGS

In the Ethernet Client List page, click Reset Statistics to set the # Transmitted

Packets and # Received Packets listings back to zero.

CLEARING THE CLIENT LIST

You can clear the client list manually by clicking Reset Clients in the Ethernet

Client List page.

The bridge erases the client list. Thereafter, clients are added to the list

automatically when they next interact with the network.

VIEWING CONNECTION STATUS

Under System Status, click Connection Status to see information about the quality

of the wireless association.

Data rate values (1, 2, 5.5, or 11 Mbps) indicate the speed of data transfer. A data

rate of 0 indicates no data transfer.

Signal strength values in the RSSI field range from 0 (no signal) to 100 (excellent

signal quality). A signal strength of 30 is good; a value of 40 or greater is very

good.

Click Refresh to update the information.

VIEWING THE SYSTEM SUMMARY

Under System Status, click System Summary to see information about the bridge.

You can go to the configuration pages of items that can be configured by

clicking their names in the list.

Click Refresh to update the information.

INTEROPERATING WITH THIRD-PARTY EQUIPMENT

Because 3Com 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.

38

4TROUBLESHOOTING

DIAGNOSING PROBLEMS

If you have difficulty with a 3Com Wireless LAN building-to-building bridge, try

the solutions in the following table.

Symptom Solutions

Two bridges fail to communicate in ad

hoc mode.

■Adjust the positions of the antennas to improve reception.

■To ensure correct operation in ad hoc mode, the settings on the

two bridges must match exactly. Launch the bridge

configuration management system and make sure that the

Wireless LAN Service Area, channel selections, Data Preamble

setting, and security settings are the same on both bridges.

The bridge fails to associate with an

access point.

■Adjust the position of the antenna to improve reception.

■Launch the bridge configuration and make sure the security

settings, advanced performance settings, and access point

privacy mode settings on the bridge match those on the

access point.

■If the access point is from another manufacturer, try turning the

Network Traffic Accelerator off and setting the Data Preamble

to long.

■Using 128-bit Dynamic Security Link encryption, the bridge

cannot associate with access points that are set to Require

Windows user authentication, which requires clients to enter a

user name and password every time they associate with the

network. Make sure the access point does not require Windows

user authentication.

■If the bridge is using an 18 dBi antenna, the FCC restricts the

use of channels 12 and 13 to very reduced rates in the United

States. Access points set to automatically select the best channel

may occasionally select channel 12 or 13. To avoid

interruptions, it is recommended that you set the access point

to use a specific channel.

The 128-bit Dynamic Security Link setting

does not work in ad hoc mode.

128-bit Dynamic Security Link is not supported in ad hoc mode.

Use the 40-bit or 128-bit Shared Keys settings instead.

39

A bridge set for 128-bit Shared Key

encryption seems to communicate with

an access point set for 40-bit Shared Key

encryption or open system.

Although the bridge is allowed to associate with an access point

set for a different level of encryption, data authentication is not

allowed. Therefore, data cannot pass between the bridge and the

access point unless their settings match exactly.

The Wireless Network Tree does not

appear in the 3Com Wireless

Infrastructure Device Manager window.

Verify that you are using the correct network adapter. In the device

manager window, click Choose NIC. Select the network adapter for

the network you want to scan, and click OK.

After upgrading the system, custom

configuration settings are lost.

Under some circumstances, upgrading the firmware and the

configuration management system forces a return to configuration

defaults. In this case, launch the bridge configuration and

reconfigure the settings.

After enabling or disabling the Secure

Web Server Connection option, some

configuration changes are lost.

Changing the Secure Web Server Connection option causes the

bridge to reset, which disrupts the network association

temporarily, but does not affect bridge configuration settings that

have already been saved. To ensure that changes to security

settings are retained, either change this option before changing

security settings, or click Save in the Wireless Network page after

changing security settings and before changing this option.

After you change the IP address, after

you restore a backup configuration, or

after you reset the bridge to factory

defaults, the Configuration Management

System stops responding and you cannot

continue configuring the bridge.

If you change the IP address and click Save, you cannot continue to

configure the device using the old IP address. Similarly, after you

restore a backup configuration or reset the bridge to factory

defaults, the IP address setting may be changed.

To recover from this situation and continue configuring the bridge:

1Close your browser.

2Return to the 3Com Wireless Infrastructure Device Manager and

click Refresh.

3Select the device and click Configure to start a new

configuration session.

You are running Windows NT. After you

connect the bridge, your computer

cannot obtain a valid IP address.

The bridge configuration settings may not be compatible with the

network. If they are not, and your Windows NT computer is set up

to obtain its IP address from a DHCP server, the bridge is unable to

associate with the network to obtain the IP address. To work

around this problem, set a static IP address on your computer.

Then set the bridge configuration to match the network. When the

bridge is able to associate, reset your computer to obtain its IP

address from the DHCP server. If the bridge should also obtain its IP

settings from the DHCP server, make sure this is configured

properly on the IP Network page and applied just before ending

the session.

A bridge fails to respond Disconnect the power for 10 seconds and then reconnect.

CAUTION: DO NOT ATTEMPT TO DISCONNECT the power under

extreme weather conditions, especially during electrical storms.

Symptom Solutions

40

DISCONNECTING THE BRIDGE

■If you are using the 3Com power supply, unplug it from the power source.

Then unplug the Ethernet cable from the power supply and the second

Ethernet cable from the bridge.

■If the bridge is connected directly to a power-over-Ethernet device, unplug the

bridge Ethernet cable from the device.

■DO NOT ATTEMPT TO DISCONNECT under extreme weather conditions,

especially during electrical storms.

UNINSTALLING SOFTWARE AND DOCUMENTATION

If you want to uninstall the 3Com 11 Mbps Wireless LAN software and

documentation, you can either use the standard operating system procedure for

removing programs or use the following shortcut procedure:

1From the Windows Start menu, select Start/Programs/3Com Wireless/Wireless

Building-to-Building Bridge/Uninstall.

2When prompted to confirm, click OK.

UPGRADING BRIDGE FIRMWARE

Firmware is the software that is installed on the bridge at the factory. Some

problems can be solved by installing a new version of the firmware (upgrading

firmware).

For details on how to download a firmware update from the 3Com customer

support Web site and install it on your bridge, see “Upgrading the System” on

page 34.

CAUTION: Disconnecting the bridge ends the network association. To avoid

possible data loss, exit all networking applications on connected devices before

you disconnect the bridge.

41

ATECHNICAL SUPPORT

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, access the 3Com Corporation World Wide Web site at

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

ONLINE TECHNICAL SERVICES

3Com offers worldwide product support 24 hours a day, 7 days a week, through

the following online systems:

World Wide Web 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, and 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 complimentary, 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>

A user name and password are not necessary when you are using a Web

browser such as Netscape Navigator and Internet Explorer.

42

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

The following list of worldwide technical telephone support number is correct at

the time of publication. Refer to the 3Com Web site for updated information.

Country Telephone Number

Asia, Pacific Rim

Australia 1 800 678 515

Hong Kong 800 933 486

India +61 2 9424 5179 or 000800 650 1111

Indonesia 001 803 61009

Japan 00531 616 439 or 03 5977 7991

43

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:

Malaysia 1800 801 777

New Zealand 0800 446 398

Pakistan +61 2 9937 5083

Philippines 1235 61 266 2602 or +61 2 9937 5076

P.R. of China 10800 61 00137 or 021 6350 1590 or 00800 0638 3266

Singapore 800 6161 463

S. Korea 00798 611 2230 or 02 3455 6455

Taiwan, R.O.C. 00801 611 261

Thailand 001 800 611 2000

Or, send a description of the problem by email to: apr_technical_support@3com.com

Europe, Middle East and Africa

From anywhere in these regions: http://emea.3com.com/support/supportnumbers.html

Latin America

Brazil http://www.3com.com/support/en_US/repair/lat.html

Mexico http://www.3com.com/support/en_US/repair/lat.html

Puerto Rico http://www.3com.com/support/en_US/repair/lat.html

Central and South America http://www.3com.com/support/en_US/repair/lat.html

North America

United States and Canada 1 800 876 3266

Country Telephone Number

44

Country Contact Information

Asia, Pacific Rim + 65 543 6500 Phone + 65 543 6348 Fax

Europe, South Africa, and Middle East http://emea.3com.com/gls

For e-mail Support:

http://emea.3com.com/support/email.html

Central and South America http://www.3com.com/support/en_US/repair/lat.html

Argentina http://www.3com.com/support/en_US/repair/lat.html

Bolivia http://www.3com.com/support/en_US/repair/lat.html

Brazil http://www.3com.com/support/en_US/repair/lat.html

Caribbean 525 201 0004

Chile 562 240 6200

Colombia 525 201 0004

Ecuador http://www.3com.com/support/en_US/repair/lat.html

Mexico http://www.3com.com/support/en_US/repair/lat.html

Paraguay 525 201 0004

Peru 511 241 1691

Uruguay 525 201 0004

Venezuela 525 201 0004

From the following countries, you may call the toll-free numbers; select option 2 and then option 2:

Austria 0800 297468

Belgium 0800 71429

Denmark 800 17309

Finland 0800 113153

France 0800 917959

Germany 0800 1821502

Hungary 06800 12813

Ireland 1800553117

Israel 1800 9453794

Italy 800 879 489

Netherlands 0800 0227788

Norway 800 11376

45

Poland 00800 3111206

Portugal 0800 831416

South Africa 0800 995014

Spain 900 983125

Sweden 020 795482

Switzerland 0800 55 3072

U.K. 0800 966197

U.S.A. and Canada 1 800 876 3266

Country Contact Information

REGULATORY COMPLIANCE INFORMATION

3Com Wireless LAN Outdoor Bridge Solution

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 2 meters.

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. This product must be installed by a

professional technician/installer.

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 to which the receiver is connected.

■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

5500 Great America Parkway

P.O. Box 58145

Santa Clara, CA 95054-8145

(408) 326-5000

Declares that the product:

Date: 13 December 2002

Brand Name: 3Com Corporation

Model Number: WL-306B

Equipment Type: Wireless LAN Building-to-Building Bridge

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.

Industry Canada Notice (Applicable to Use Within Canada)

This device complies with Canadian RSS-210.

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.

The installer of this radio equipment must ensure that the antenna is located or pointed such that it does not emit RF field

in excess of Health Canada limits for the general population; consult Safety Code 6, obtainable from Health Canada’s web

site www.hc-sc.gc.ca/rpb.

Avis de Conformité à la Réglementation d’Industrie Canada

Pour empêcher toute interférence aux services 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.

L’installateur du présent matériel radio doit s’assurer que l’antenne est située ou pointée de manière à ce que cette

dernière n’émette pas de champs radioélectriques supérieurs aux limites specifées par Santé Canada pour le grand public;

consulter le Code de sécurité 6, disponible sur le site Web de Santé Canada, à l’adresse suivante: www.hc-sc.gc.ca/rpb.

Industry Canada (IC) Emissions Compliance Statement

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 conforme à la norme NMB-003 du Canada.

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

■EN 301 489-17 - Electromagnetic compatibility and Radio Spectrum Matters (ERM); Electromagnetic Compatibility

(EMC) standard for radio equipment and services; Part 17: Specific conditions for 2.4 GHz wideband transmission

systems and 5 GHz high performance RLAN equipment.

■EN 60950 - Safety of information technology equipment, including electrical business equipment.

Marking by the symbol:

indicates that usage restrictions apply.

In France, this product must be configured to operate on a legal channel. Channels 10 - 13 are allowed. User

documentation should be consulted to ensure that this product is used in accordance with local spectrum restrictions.

Additional Country Restrictions

■In Israel, this product must be configured to operate on a legal channel. Channels 5 - 7 are allowed.

■In Jordan, this product must be configured to operate on a legal channel. Channels 10 - 13 are allowed.

User documentation should be consulted to ensure that this product is used in accordance with local spectrum restrictions.

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 60950, 3rd Edition / CSA C22.2 No. 60950-00

■IEC 60950

■EN 60950

Published february, 2003

User Guide Version 1.2.0

INDEX

Numbers

128-bit Dynamic Security Link 33

128-bit Shared Key 33

3Com Knowledgebase Web Services 41

3Com Wireless Infrastructure Device Manager 18

40-bit Shared Key (Wi-Fi) security 32

A

access point network 9, 30

access point privacy mode 25

acknowledgement delay 27

ad hoc network 9, 28

adapter, choosing 19

administration password, changing 35

administration tool 18

requirements 11

advanced performance properties 26

antenna

aligning 12

channel and power restrictions 12

configuring 25, 27

grounding 11

lightning arrestor 12

polarization 12

selection 25

association with access points using different

encryption 32

authentication, data 32

B

backing up configurations 35

basic service set identification (BSSID) 24

bridge

changing properties 21

installation 10

maintaining configurations 35

password 35

resetting 22, 33, 39

restoring factory defaults 34

user name 35

broadcast ESSID 25

broadcast RSSI 27

C

changing passwords, administration 35

channel and power restrictions 12

channel selection 25

choosing a NIC 19

clearing the client list 37

client list 37

configuration 18

backing up 35

maintenance for bridges 35

restoring 36

saving changes 21

Configuration Management System 19, 20

Configure button 19

configuring

antenna distance 27

antenna selection 25

country selection 25

through a wireless association 32

connecting power 10

connection status, viewing 37

country

configuring 25

selection 25

D

data authentication 32

data preamble 26

data rate 27

delay, acknowledgement 27

device

configuring 19, 20

location 22

name 22

device manager 18

launching 18

Dynamic Security Link 33

E

encryption

settings 31

string 32

encryption, association with different settings 32

ESSID 24

F

filtering

port 23

protocol 23

firmware upgrade 34

flow control 26

G

grounding antennas 11

guidelines, security 32

H

help file location 22

help file path 22

hexadecimal keys 32

I

installation 10

bridge 10

connecting to a wired network 15

firmware 34

power 10

requirements 10

software utilities 16

interoperating with third-party equipment 37

IP address 22

refreshing after changing 19

specifying 22, 23

K

keys 32

L

launching the device manager 18

lightning arrestor 12

locating devices 18, 19

login user name and password 33

M

MAC address, use in locating devices 18, 19

N

network

access point 9, 30

ad hoc 9, 28

infrastructure 24

mode 24

privacy mode 25

traffic accelerator 26

network supplier support 42

NIC, choosing 19

No Security 32

O

online technical services 41

open system 32

operating mode

access point 9, 30

ad hoc 9, 28

P

password, changing 35

performance properties, advanced 26

point-to-multipoint 7

association 30

topology 8

point-to-point 7

association 28

topology 7

polarization 12

port filtering 23

power and channel restrictions 12

power requirements 10

Pre-IP Configuration Wizard 19, 20

privacy mode 25

problem solving 38

Properties button 19

protocol filtering 23

R

radio channel settings 25

Refresh button 19

resetting a bridge 22, 33, 39

restoring a configuration 36

restoring settings to factory defaults 34

restrictions, channel and power 12

returning products for repair 43

RSSI broadcasting 27

S

safety information 13

saving configuration changes 21

secure web server connection 22, 39

security 31

128-bit Dynamic Security Link 33

128-bit Shared Key 33

40-bit Shared Key (Wi-Fi) 32

guidelines 32

no security 32

saving settings 21

settings, radio channel 25

shared keys 32

signal strength, broadcasting 27

software utilities 16

installing 16

solving problems 38

system summary, viewing 37

T

technical support

3Com Knowledgebase Web Services 41

network suppliers 42

product repair 43

temperature 11

thermal performance 11

third-party interoperability 37

traffic accelerator 26

troubleshooting 38

bridge firmware 34

U

upgrading bridge firmware 34

user name 35

W

Web browser configuration 18

web server, secure connection 22, 39

wireless LAN service area 24

Wireless Network Login 33

wireless network tree 18

World Wide Web (WWW) 41