3Com 005687-03 - User manual

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.
© 1998 3Com Corporation
7770 North Frontage Road
Skokie, IL 60077-2690
All Rights Reserved
∗∗ 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
1
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
2
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
3
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
4
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
5
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
6
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: