3COM 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.
Copyright © 1997 3Com Corporation or its subsidiaries 7770 North Frontage Road
Before You Begin (Windows 95 Users)
Determining Available Resources
Determining Your Version of Windows 95
Upgrading to x2 Technology
Modem Installation with Windows 3.x
A Word About COM Ports and IRQs
How to Use ComTest to Determine Your Modem’s Settings
Testing an Installed Modem
What to Do with ComTest’s Recommendation
How to Change the Modem’s Settings
How to Insert the Modem into the Computer
Modem Installation with Windows 95
How to Prepare for Plug and Play Installation
How to Insert the Modem into the Computer
Installing the Modem Drivers
Software Installation and Testing
Software Installation and Registration Using the Setup Wizard
Sending Your First Fax
Installing Other Fax/Data Software
Type of Modem
U.S. Robotics Modem Update Wizard
Using Modem Station
Troubleshooting and Online Help Resources
When Plug and Play Fails
Online Help Resources
Are You Still Having Problems?
If You Need to Return the Modem to Us
RapidComm Voice Troubleshooting Tips
A Note to Users with Older Versions of RapidComm Voice on Their Systems
Technical Quick Reference
AT Command Summary
Manufacturer’s Declaration of Conformity
Caution to the User
UL Listing/CUL Listing
Connecting to the Telephone Company
Radio and Television Interference
For Canadian Modem Users
BEFOREYOUBEGIN(WINDOWS® 95 USERS)
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 toSettings, and then clickControl Panel.
3.When the “System Properties” screen appears, click the Device Manager tab.
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.
Determining Your Version of
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.
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
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*.
MODEMINSTALLATION WITHWINDOWS® 3.X
You’ll need these items from your Sportster ® modem box:
a screwdriver (not included)
A Word about COM Ports
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
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.
D 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. 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 good time to read that software’s manual to determine what setting is required.
How to Use ComTest to
Determine Your Modem’s
1.Insert the Connections CD into your CDROM drive.
2.In Windows’ Program Manager, click Run on theFile menu. Typed:\comtest.exe and pressENTER. 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.
4. ClickInternal Modem. Then clickNext.
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
If you do not have a free setting, you will see a screen like this.