3Com EtherLink 3C900B User manual

This manual covers installation and operating instructions for the following 3Com®U.S. Robotics®

modems:

Sportster®Voice 33.6 kbps internal modems

3Com, the 3Com logo, U.S. Robotics, the USRobotics logo, and Sportster are registered

trademarks; Connections, Total Control, Courier, RapidComm, x2, and the x2 logo are trademarks

and Towne Square 2000 is a service mark of 3Com Corporation or its subsidiaries. Windows and

Internet Explorer are registered trademarks of Microsoft Corp. CompuServe is a registered

trademark of CompuServe Inc. America Online is a registered trademark of America Online Inc.

Netscape Navigator is a trademark of Netscape Communications Corp. Any other trademarks, trade

names, or service marks used in this manual are the property of their respective owners.

7770 North Frontage Road

Skokie, IL 60077-2690

TABLE OF CONTENTS

Before You Begin (Windows 95 Users) 1

Determining Available Resources 1

Determining Your Version of Windows 95 2

Upgrading to x2 Technology 2

Modem Installation with Windows 3.x 3

A Word About COM Ports and IRQs 3

How to Use ComTest to Determine Your Modem’s Settings 5

Testing an Installed Modem 7

What to Do with ComTest’s Recommendation 8

How to Change the Modem’s Settings 10

How to Insert the Modem into the Computer 12

Modem Installation with Windows 95 19

How to Prepare for Plug and Play Installation 19

How to Insert the Modem into the Computer 21

Installing the Modem Drivers 25

Software Installation and Testing 33

Software Installation and Registration Using the Setup Wizard 33

Sending Your First Fax 48

TABLEOFCONTENTS

iii

Installing Other Fax/Data Software 52

Type of Modem 52

Initialization String 52

Flow Control 52

U.S. Robotics Modem Update Wizard 53

Installation 53

Operation 58

Using Modem Station 65

Troubleshooting and Online Help Resources 89

When Plug and Play Fails 95

Online Help Resources 96

Are You Still Having Problems? 100

If You Need to Return the Modem to Us 101

RapidComm Voice Troubleshooting Tips 102

A Note to Users with Older Versions of RapidComm Voice on Their Systems 102

Glossary 103

Technical Quick Reference 113

AT Command Summary 114

S Registers 128

Regulatory Information 138

Manufacturer’s Declaration of Conformity 138

TABLEOFCONTENTS

Caution to the User 139

IC (Canada) 139

UL Listing/CUL Listing 139

Connecting to the Telephone Company 140

Fax Branding 140

Radio and Television Interference 141

For Canadian Modem Users 142

Limited Warranty 145

Index 148

BEFORE YOU BEGIN (WINDOWS®95 USERS)

Determining Available

Resources

Your Sportster®Voice modem is a Plug and

Play device. Windows™95 can automatically

identify a Plug and Play device and determine if

your system has the resources necessary to

support the device. However, Plug and Play

will not work if you do not have resources

available or if devices on your system are not

reporting resource usage correctly. Here’s

how you can verify that your system has the

necessary resources before installing the

modem:

1. Click the Windows 95 Start button, point

to Settings, and then click Control Panel.

2. Double-click the System icon.

3. When the “System Properties” screen

appears, click the Device Manager tab.

4. Double-click Computer and the

“Computer Properties” screen appears.

5. Select the option at the top of the screen to

show Interrupt Requests (IRQs).

You will see the IRQs your system is currently

using. If IRQs 3, 4, 5, and 7 are being used,

you need to free an IRQ before you begin

installation. This process involves moving a

device from the IRQ you want to use to a

different (and usually higher) IRQ setting.

Please read the documentation for (or contact

the manufacturer of) the device that is currently

using the IRQ you want to use for your modem

to learn more about how to free the IRQ for

your modem.

BEFOREYOUBEGIN(WINDOWS95 USERS)

Determining Your Version of

Windows 95

Follow these steps to determine your version

of Windows 95. This information will be

important during installation.

1. Click the My Computer icon on your

desktop with the right mouse button.

2. Click Properties.

3. In the “System Properties” screen, look at

the system information under the General

tab (circled in the following screen image).

The number following the text “Microsoft

Windows 95” will end with “950”, “950a”,

or “950b”. This indicates your version of

Windows 95. Write this number on the

blank below for later reference. Then click

OK.

Windows 95 version

_________________

Upgrading to x2™Technology

Be sure to read the section titled “U.S.

Robotics Modem Update Wizard” on page 53

for information on upgrading your 33.6

faxmodem to x2™technology, allowing

downloads of up to 56 kbps*.

• IMPORTANT! All x2 products are capable of 56 kbps

downloads; however, due to FCC rules which restrict power

output of the service providers' modems, current download

speeds are limited to 53 kbps. Actual speeds may vary

depending on line conditions. Uploads from end users to service

providers travel at speeds up to 28.8 kbps. An x2 modem, an

analog phone line compatible with x2 technology, and an

Internet Service Provider with x2 service are necessary for these

high-speed downloads. See http://www.3com.com/x2 for details.

MODEM INSTALLATION WITH WINDOWS®3.X

You’ll need these items from your

Sportster ®modem box:

modem phone cord

Connections™CD microphone

Plus:

a screwdriver (not included)

AWordaboutCOMPorts

and IRQs

Most computer accessories — a mouse,

sound card, enhanced graphics card, scanner,

etc. — require a special connection through

which they can communicate with the

computer. For some devices, this connection is

called a communications (or COM) port. Most

computers have 1 or 2 COM ports, but they

can have up to 4. Although internal modems

do not connect to COM ports directly, they do

require a COM port setting, which is

determined by the setting on the modem’s

COM jumper pins.

Each COM port uses an interrupt request

(IRQ). An accessory uses an IRQ to get the

attention of your computer’s central

MODEMINSTALLATIONWITHWINDOWS3.X

processing unit (CPU) so that the accessory

can perform a task. The computer stops what

it’s doing, depending on the priority of the

request, to help the accessory perform its task.

When two accessories share an IRQ, it’s like

two people asking different questions in unison

to a third person. Just as the person being

asked the two questions cannot understand

either request, a computer can lock up or

otherwise fail to communicate properly with

your modem when there is an IRQ conflict.

DKEY POINT: Accessories cannot

share COM ports and should not share

IRQs. When accessories try to share

settings, they will either not work

properly or not work at all.This section

of the manual will help you understand

the COM/IRQ settings on your new

Sportster modem.

3Com has set your modem to a default Plug

and Play setting geared towards Windows 95

users. In this configuration, the shunts used to

set your modem’s COM port and IRQ settings

are hanging from single jumper pins and will

not affect your modem’s settings. As a

Windows 3.x user, you need to run the

ComTest program (on the Connections CD) to

determine what settings your modem should

use.

NOTE: Some communications

software programs require a particular

setting for your modem (RapidComm,

which shipped with your modem, does

not). If you wish to use a program other

than RapidComm, now is a goodtime to

read that software’s manual to

determine what setting is required.

MODEMINSTALLATIONWITHWINDOWS3.X

HowtoUse ComTestto

DetermineYourModem’s

Settings

1. Insert the Connections CD into your CD-

ROM drive.

2. In Windows’ Program Manager, click Run

on the File menu. Type d:\comtest.exe

and press ENTER. This starts ComTest,

the program that determines which COM

ports and IRQs are available for use by

your modem.

3. The screen in the next column appears

when ComTest starts.

• If there is a modem in your computer

which you are replacing with your new

Sportster modem, go to “Testing an

Installed Modem” on page 7 to

determine which COM and IRQ settings

the older modem is using.

• If a modem is not currently installed in

your computer, click Recommend

settings for a new modem.

Then click Next.

MODEMINSTALLATIONWITHWINDOWS3.X

4. Click Internal Modem. Then click Next.

5. If you have a free setting, you will see a

screen like this.

COM2/IRQ3 is free in this example.

ComTest might instead recommend

COM1/IRQ4, COM3/IRQ4, or

COM4/IRQ3 for your modem.

Write down the displayed settings. You’ll

need to know these settings later. Click

Next.

If you do not have a free setting, you will

see a screen like this.

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