3Com 005687-03 - Manuale utente

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

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

U.S. Robotics is a registered trademark and Connections, RapidComm, and x2 are trademarks of

3Com Corporation and 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

Internal 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..................................................................13

Internal Modem Installation with Windows 95...............................................................21

Plug and Play Installation................................................................................................21

How to Prepare for Plug and Play Installation.................................................................22

Check Your System’s Resources.......................................................................22

Find Out Which Version of Windows 95 You Have...........................................23

Check the Jumpers............................................................................................24

How to Insert the Modem into the Computer..................................................................26

How to Move Through the Screens You See When Windows Restarts...........................31

If You Have Windows 95 Version 950 or 950a.................................................31

If You Have Windows 95 Version 950b............................................................36

External Modem Installation with Windows 3.x..............................................................41

How to Determine Which Serial Cable to Buy................................................................41

How to Connect the Modem to the Computer................................................................42

External Modem Installation with Windows 95...............................................................45

How to Determine Which Serial Cable to Buy................................................................45

How to Find Out Which Version of Windows 95 You Have..........................................47

How to Connect the Modem to the Computer................................................................48

How to Move Through the Screens You See When Windows Restarts...........................50

If You Have Windows 95 Version 950 or 950a.................................................50

If You Have Windows 95 Version 950b............................................................55

Software Installation .........................................................................................................60

Starting the Wizard........................................................................................................61

Installing the RapidComm™ Fax/Data Software.............................................................62

Installing Other Fax/Data Software.................................................................................64

Type of Modem.............................................................................................................64

Initialization String..........................................................................................................64

Flow Control.................................................................................................................65

UART (External Modems Only).....................................................................................65

Using Modem Station.........................................................................................................66

What Does Modem Station Do?....................................................................................66

Why Modem Station?....................................................................................................66

Installing Modem Station................................................................................................66

Starting Modem Station.................................................................................................69

Using Detect New Modems...........................................................................................71

Using Terminal...............................................................................................................72

Using Modem Configurator............................................................................................74

Using Modem to Computer............................................................................................77

Using the Extended Information Screens.........................................................................81

U.S. Robotics Modem Update Wizard...............................................................................88

Installing the Wizard.......................................................................................................89

Updating Your Modem .................................................................................................89

Troubleshooting and Online Help Resources..................................................................90

Problems and Solutions..................................................................................................90

Online Help Resources.................................................................................................105

Are You Still Having Problems?...................................................................................108

If You Need to Return the Modem to Us for Repair.....................................................109

Glossary...............................................................................................................................110

Regulatory Information.....................................................................................................124

Manufacturer’s Declaration of Conformity....................................................................124

Caution to the User......................................................................................................125

IC (Canada)................................................................................................................125

UL Listing/CUL Listing................................................................................................125

Connecting to the Telephone Company........................................................................126

Fax Branding...............................................................................................................126

Radio and Television Interference.................................................................................127

For Canadian Modem Users........................................................................................128

Limited Warranty.........................................................................................................131

WELCOME TO 56K* INFORMATION ACCESS

The International Telecommunications Union

(ITU) decides 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 decided on a worldwide 56K

standard technology. So, now with a

U.S. Robotics modem you can get all the

Internet you want from any service provider

who offers the ITU standard 56K technology

or x2™ technology.

This modem will give you the most

compatibility with 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.

*Capable of receiving up to 56 Kbps and sending

up to 31.2 Kbps. Due to FCC regulations, receiving

speeds are limited to 53 Kbps. Actual speeds may

vary. Requires compatible phone line and server

equipment. Complies with both the proposed ITU

56K standard and x2 protocols. ITU 56K standard

officially determined in February, 1998; expected to

be ratified in September, 1998. See

www.3com.com/56k

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

INTERNAL MODEM INSTALLATION WITH WINDOWS

3.X

You’ll need these items from your

U.S. Robotics modem box:

modem phone cord

Connections CD

Plus:

a screwdriver (not included)

AWord aboutCOM Ports

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

INTERNALMODEMINSTALLATIONWITHWINDOWS3.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.

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 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.

INTERNALMODEMINSTALLATIONWITHWINDOWS3.X

Howto Use ComTestto

DetermineYour Modem’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 U.S.

Robotics®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.

INTERNALMODEMINSTALLATIONWITHWINDOWS3.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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