3Com 005605-00 Manuale utente

This manual covers installation and operating instructions for the following 3Com modems:

U.S. Robotics 56 Kbps∗Voice internal and external modems

3Com, the 3Com logo, and U.S. Robotics are registered trademarks and Connections, RapidComm, and

x2 are trademarks of 3Com Corporation or its subsidiaries. Windows is a registered trademark of

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

registered trademark of America Online Inc. 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

∗∗ IMPORTANT! In accordance with the ITU-T standard for 56K transmissions, this modem is 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 and other factors. Uploads from users to server equipment travel at speeds up to 31.2 Kbps.

An analog phone line compatible with the ITU-T 56K standard or x2technology, and an Internet

provider or corporate host site compatible with the ITU-T 56K standard or x2 technology are necessary

for these high-speed downloads.

TABLE OF CONTENTS

Welcome to 56K Information Access 1

Product Features 2

Before You Begin (Windows 95 Users) 3

Determining Available Resources 3

Determining Your Version of Windows 95 4

Internal Modem Installation with Windows 3.x 5

A Word about COM Ports and IRQs 5

How to Use ComTest to Determine Your Modem’s Settings 7

Testing an Installed Modem 9

What to Do with ComTest’s Recommendation 10

How to Change the Modem’s Settings 12

How to Insert the Modem into the Computer 14

Internal Modem Installation with Windows 95 21

How to Prepare for Plug and Play Installation 22

How to Insert the Modem into the Computer 23

Installing the Modem Drivers 27

External Modem Installation with Windows 95 35

Determining Which Serial Cable to Buy 35

Connecting the Modem to the Computer 37

Installing the Modem Drivers 39

TABLEOFCONTENTS

Software Installation 47

Running the Setup Wizard 47

Using Connections 48

Installing the RapidComm™ Voice Fax/Data/Voice Software 48

Installing Other Fax/Data Software 50

Type of Modem 50

Initialization String 50

Flow Control 51

UART (External Modems Only) 51

Using Modem Station 52

What Does Modem Station Do? 52

Why Modem Station? 52

Installing Modem Station 52

Starting Modem Station 55

Using Detect New Modems 57

Using Terminal 58

Using Modem Configurator 60

Using Modem to Computer 63

Using the Extended Information Screens 67

TABLEOFCONTENTS

U.S. Robotics Modem Update Wizard 74

Installing the Wizard 74

Updating Your Modem 75

Troubleshooting and Online Help Resources 76

RapidComm Voice Troubleshooting Tips 82

If Plug and Play Does Not Detect Your Modem 83

Online Help Resources 84

Are You Still Having Problems? 87

If You Need to Return the Modem to Us for Repair 87

Glossary 88

Regulatory Information 102

Manufacturer’s Declaration of Conformity 102

Limited Warranty 109

WELCOME TO 56K* INFORMATION ACCESS

The International Telecommunications Union

(ITU) determines the technical protocols

communications devices must use to

interoperate with each other. Modems that

comply with ITU standards can “talk” to other

standards-compliant modems and fax

machines worldwide.

The ITU has determined a worldwide standard

for 56K modem technology . With a U.S.

Robotics modem, you can get all the Internet

you want from any service provider who offers

the ITU 56K standard or x2™ technology.

This modem allows the greatest compatibility

for high speed downloads from service

providers that offer the ITU 56K standard

technology or x2 technology to their

customers. 3Com is working with providers

everywhere to quickly upgrade their service to

the ITU 56K standard.

*In accordance with the ITU-T standard for 56K

transmissions, this modem is 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 and other factors. Uploads from users

to server equipment travel at speeds up to 31.2

Kbps. An analog phone line compatible with the

ITU-T 56K standard or x2technology, and an

Internet provider or corporate host site compatible

with the ITU-T 56K standard or x2 technology are

necessary for these high-speed downloads.

PRODUCT FEATURES

Modulation Schemes

56K ITU-T standard

x2™ technology

ITU-T V.34+

ITU-T V.34

ITU-T V.32bis

ITU-T V.32

ITU-T V.22bis

ITU-T V.22

ITU-T V.23

Bell 212A

ITU-T V.21

Bell 103

Error Control and Data

Compression Schemes

ITU-T V.42

ITU-T V.42bis

MNP 2-5

Fax Modulation Schemes

ITU-T V.17

ITU-T V.29

ITU-T V.27ter

ITU-T V.21

Fax Standards

EIA 578 Class 1 FAX

EIA 592 Class 2.0 FAX

Front Channel Link Rates

28000, 29333, 30666, 32000,

33333, 34666, 36000, 37333,

38666, 40000, 41333, 42666,

44000, 45333, 46666, 48000,

49333, 50666, 52000, 53333,

54666, 56000, 57333

Back Channel Link Rates

4800, 7200, 9600, 12000, 14400,

16800, 19200, 21600, 24000,

26400, 28800, 31200

33600

V.34+ Link Rates

4800, 7200, 9600, 12000, 14400,

16800, 19200, 21600, 24000,

26400, 28800, 31200, 33600

V.32bis Link Rates

4800, 7200, 9600, 12000, 14400

Additional Link Rates

300, 1200/75 (V.23), 1200, 2400

Fax Link Rates

2400, 4800, 7200, 9600,

12000, 14400

BEFORE YOU BEGIN (WINDOWS®95 USERS)

Determining Available

Resources

Your U.S. Robotics®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 _________________

INTERNAL MODEM INSTALLATION WITH WINDOWS®

3.X

You will need these items from your

U.S. Robotics®modem box:

modem phone cord

Connections™CD microphone

Plus:

screwdriver (not included)

A Word about COM Ports and

IRQs

Most computer accessories — 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, though

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.

INTERNALMODEMINSTALLATIONWITHWINDOWS3.X

Each COM port uses an interrupt request

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

attention of your computer’s centralprocessing

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.

KEY 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.

3Com has set your modem to a default Plug

and Play setting which is ideal for 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.

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