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3Com 005605-00 Manual

3Com 005605-00 Manual

Voice internal and external modems
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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.
© 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.

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Summary of Contents for 3Com 005605-00

  • Page 1 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.

  • Page 2: Table Of Contents

    ABLE OF ONTENTS Welcome to 56K Information Access Product Features Before You Begin (Windows 95 Users) Determining Available Resources Determining Your Version of Windows 95 Internal 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...
  • Page 3 ABLE OF ONTENTS Software Installation Running the Setup Wizard Using Connections Installing the RapidComm™ Voice Fax/Data/Voice Software Installing Other Fax/Data Software Type of Modem Initialization String Flow Control UART (External Modems Only) Using Modem Station What Does Modem Station Do? Why Modem Station? Installing Modem Station Starting Modem Station...
  • Page 4 ABLE OF ONTENTS U.S. Robotics Modem Update Wizard Installing the Wizard Updating Your Modem Troubleshooting and Online Help Resources RapidComm Voice Troubleshooting Tips If Plug and Play Does Not Detect Your Modem Online Help Resources Are You Still Having Problems? If You Need to Return the Modem to Us for Repair Glossary Regulatory Information...

  • Page 5: Welcome To 56K Information Access

    5 6K* I ELCOME TO NFORMATION CCESS The International Telecommunications Union This modem allows the greatest compatibility (ITU) determines the technical protocols for high speed downloads from service communications devices must use to providers that offer the ITU 56K standard interoperate with each other.

  • Page 6: Product Features

    RODUCT EATURES Modulation Schemes Fax Modulation Schemes Back Channel Link Rates 56K ITU-T standard ITU-T V.17 4800, 7200, 9600, 12000, 14400, x2™ technology ITU-T V.29 16800, 19200, 21600, 24000, ITU-T V.34+ ITU-T V.27ter 26400, 28800, 31200 ITU-T V.34 ITU-T V.21 33600 ITU-T V.32bis Fax Standards...

  • Page 7: Before You Begin (Windows 95 Users)

    ® 95 U EFORE EGIN INDOWS SERS 3. When the “System Properties” screen Determining Available appears, click the Device Manager tab. Resources 4. Double-click Computer and the ® Your U.S. Robotics Voice modem is a Plug “Computer Properties” screen appears. ®...

  • Page 8: Determining Your Version Of Windows 95

    95 U EFORE EGIN INDOWS SERS Windows 95 version _________________ 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.

  • Page 9: A Word About Com Ports And Irqs

    ® NTERNAL ODEM NSTALLATION WITH INDOWS A Word about COM Ports and You will need these items from your ® U.S. Robotics modem box: IRQs Most computer accessories — mouse, sound card, enhanced graphics card, scanner, etc. — require a special connection through which they can communicate with the computer.
  • Page 10 NTERNAL ODEM NSTALLATION WITH INDOWS KEY POINT: Accessories cannot Each COM port uses an interrupt request share COM ports and should not share (IRQ). An accessory uses an IRQ to get the IRQs. When accessories try to share attention of your computer’s centralprocessing settings, they will either not work unit (CPU) so that the accessory can perform properly or not work at all.

  • Page 11: How To Use Comtest To Determine Your Modem's Settings

    NTERNAL ODEM NSTALLATION WITH INDOWS The screen in the next column appears when ComTest starts. NOTE: Some communications If there is a modem in your computer software programs require a particular which you are replacing with your new setting for your modem (the RapidComm U.S.
  • Page 12 NTERNAL ODEM NSTALLATION WITH INDOWS 4. Click Internal Modem. Then click Next. Write down the displayed settings here: COM Port_________ IRQ_________ You will need to know these settings later. Click Next. If you do not have a free setting, you will see a screen like the follwoing.

  • Page 13: Testing An Installed Modem

    NTERNAL ODEM NSTALLATION WITH INDOWS Testing an Installed Modem 6. When you see this screen, click Finish to exit ComTest. If there is a modem already installed in your computer, you can determine its COM and IRQ settings by selecting the Test an installed modem option.

  • Page 14: What To Do With Comtest's Recommendation

    NTERNAL ODEM NSTALLATION WITH INDOWS What to Do with ComTest’s is not acceptable. When ComTest recommends either COM3/IRQ4 or Recommendation COM4/IRQ3, the IRQ in the setting is being used by another accessory. You could use the NOTE: If your communications suggested IRQ for the modem, but you run the software requires a modem setting that risk that the modem and/or the other accessory...
  • Page 15 NTERNAL ODEM NSTALLATION WITH INDOWS If ComTest reports that “You do not Find out how to disable the COM port. have any available COM ports and/or Find out which of the sockets on the back IRQs” of your computer COM 2. If you have something plugged into that We recommend you disable COM1 or port, find out if you can plug it in...

  • Page 16: How To Change The Modem's Settings

    NTERNAL ODEM NSTALLATION WITH INDOWS accessories elsewhere so that you can damage your modem. Then take the disable its COM port. The accessory will modem out of its plastic bag. not work once its port is disabled. 2. Find the COM and IRQ jumper shunts (small black plastic pieces) on your If you’ve disabled COM1, you can now use modem’s jumper pins (see the following...
  • Page 17 NTERNAL ODEM NSTALLATION WITH INDOWS 4. Move the jumper shunt to the new setting. The COM port setting can involve one TIP: Grasp the jumper shunts with to three shunts. The four possible COM a tweezers or needle-nosed pliers. DO port settings are as follows: NOT grasp too firmly, as you may crush the jumper shunts.

  • Page 18: How To Insert The Modem Into The Computer

    NTERNAL ODEM NSTALLATION WITH INDOWS 1. Turn off your computer and unplug it from How to Insert the Modem into the electrical outlet. the Computer 2. Unplug any peripheral devices (printer, monitor, keyboard, mouse, etc.) from the computer. NOTE: Before installing your modem, write its serial number in the space provided here: TIP:...
  • Page 19 NTERNAL ODEM NSTALLATION WITH INDOWS 3. Remove the screws from your computer’s 4. Find an empty ISA expansion slot at least cover and then remove the cover, as shown as long as the gold edge of your modem. in the following diagrams. Your computer (ISA slots are usually black plastic grooves may differ in appearance from these lined with silver metal.) Unscrew and...
  • Page 20 NTERNAL ODEM NSTALLATION WITH INDOWS 5. Holding the modem at each corner, with the gold edge facing the slot, push the modem down as gently as possible until it snaps into the expansion slot. (The drawings show horizontally aligned expansion slots. Some computers have vertically aligned slots.
  • Page 21 NTERNAL ODEM NSTALLATION WITH INDOWS WARNING : The phone jack you use must be for an ANALOG phone line (the type found in most homes). Many office buildings have digital phone lines. Be sure you know which type of line you have. The modem will be damaged if you use a digital phone line.
  • Page 22 NTERNAL ODEM NSTALLATION WITH INDOWS 13. Plug the power cords, cables, and 16. Double-click the Control Panel icon. peripherals back into the computer and turn the computer on. 14. Start Windows. 15. If you have your modem set to COM1/IRQ4 or COM2/IRQ3, go to “Software Installation”...
  • Page 23 NTERNAL ODEM NSTALLATION WITH INDOWS 18. If it’s not already selected, click the COM 20. In the Interrupt Request Line (IRQ) port for your modem. Then click Settings. box, select the IRQ that ComTest recommended. 21. Click OK. 19. Click Advanced. 22.
  • Page 24 NTERNAL ODEM NSTALLATION WITH INDOWS When Windows restarts, you are ready to register your modem online. Turn to “Software install the Connections program group and Installation” (page 47) for more information.

  • Page 25: Internal Modem Installation With Windows 95

    ® NTERNAL ODEM NSTALLATION WITH INDOWS You will need these items from your U.S. Robotics modem box: NOTE: Complete the instructions in the section “Before You Begin (Windows 95 Users)” on page 3 before continuing with the following instructions. Your new U.S. Robotics modem is a “Plug modem phone cord and Play”...

  • Page 26: How To Prepare For Plug And Play Installation

    NTERNAL ODEM NSTALLATION WITH INDOWS How to Prepare for Plug and Play Installation 1. Touch an unpainted metal part of your computer (the back is usually unpainted) to discharge static electricity. Static can damage your modem. 2. Take the modem out of its plastic bag. When doing a “Plug and Play”...

  • Page 27: How To Insert The Modem Into The Computer

    NTERNAL ODEM NSTALLATION WITH INDOWS How to Insert the Modem into the Computer NOTE: Before installing your modem, write its serial number here: SERIAL NUMBER ________________ You’ll find the serial number underneath the bar code on the white sticker on the modem and on the NOTE: If you need to move the outside of the box the modem came in.
  • Page 28 NTERNAL ODEM NSTALLATION WITH INDOWS 1. Turn off your computer and unplug it from in the following diagrams. Your computer the electrical outlet. may differ in appearance from these 2. Unplug any peripheral devices (printer, diagrams, but the basic principle for monitor, keyboard, mouse, etc.) from the removing the cover should be the same.
  • Page 29 NTERNAL ODEM NSTALLATION WITH INDOWS 4. Find an empty ISA expansion slot that’s at 5. Holding the modem at each corner, with the least as long as the gold edge of your gold edge facing the slot, push the modem modem.
  • Page 30 NTERNAL ODEM NSTALLATION WITH INDOWS this jack, disconnect the telephone cord from the jack. WARNING : The phone jack you use must be for an ANALOG phone line (the type found in most homes). Many office buildings have digital phone lines.

  • Page 31: Installing The Modem Drivers

    NTERNAL ODEM NSTALLATION WITH INDOWS 13. Plug the power cords, cables, and peripherals back into the computer and turn NOTE: You cannot use the modem on the computer. and a phone at the same time if they share the same telephone line. Installing the Modem Drivers 11.
  • Page 32 NTERNAL ODEM NSTALLATION WITH INDOWS 2. When you see this screen, insert the Connections CD into your CD-ROM drive and type D:\ to replace the A:\. (If your CD-ROM drive has a different letter name, type that letter instead of D.) Click Driver from disk provided by hardware manufacturer.
  • Page 33 NTERNAL ODEM NSTALLATION WITH INDOWS 3. Once Windows finishes loading the 4. Double-click the Modems icon (circled in information from the CD-ROM, you should the screen image below). verify that the modem installation was a success. When your desktop returns, click the Windows Start button and point to Settings.
  • Page 34 NTERNAL ODEM NSTALLATION WITH INDOWS 5. In the “Modems Properties” screen, you should see a description of your modem. NOTE: If you do not see your modem listed in the preceding screen, the Plug and Play installation was unsuccessful. Please refer to the “If Plug and Play Does Not Detect Your Modem”...
  • Page 35 NTERNAL ODEM NSTALLATION WITH INDOWS Installing Modem Drivers with Windows 95 Version 950b 1. When Windows restarts, it should detect the modem (see screen below). Insert the Connections CD and click Next. You are now ready to install the Connections program group and register your modem online.
  • Page 36 NTERNAL ODEM NSTALLATION WITH INDOWS 3. Now you should verify that the modem installation was a success. When your NOTE: If this screen does not desktop returns, click the Windows Start appear, go to “If Plug and Play Does Not button and point to Settings.
  • Page 37 NTERNAL ODEM NSTALLATION WITH INDOWS 4. Double-click the Modems icon (circled in 5. In the “Modems Properties” screen, you the screen image below). should see a description of your modem. This means the installation was a success. Click OK.
  • Page 38 NTERNAL ODEM NSTALLATION WITH INDOWS NOTE: If you do not see your modem listed in the preceding screen, the Plug and Play installation was unsuccessful. Please refer to the “If Plug and Play Does Not Detect Your Modem” section on page 6.

  • Page 39: External Modem Installation With Windows 95

    XTERNAL ODEM NSTALLATION WITH INDOWS You’ll need these items from your U.S. Robotics box: NOTE: Complete the instructions in the section “Before You Begin (Windows 95 Users)” on page 3 before continuing with the following modem phone cord instructions. Determining Which Serial Connections CD power adapter Cable to Buy...
  • Page 40 XTERNAL ODEM NSTALLATION WITH INDOWS you need a shielded serial modem cable with a 25-pin female to 25-pin male connector. NOTE: Your computer’s rear panel If your PC's serial connector looks like this… may not be identical to the following diagrams.

  • Page 41: Connecting The Modem To The Computer

    XTERNAL ODEM NSTALLATION WITH INDOWS 3. Plug one end of the phone cord into the Connecting the Modem to the TELCO jack and the other end into a Computer phone wall jack. 1. Turn off your computer and any attached peripherals.
  • Page 42 XTERNAL ODEM NSTALLATION WITH INDOWS If you wish to use your modem and phone through the same phone wall jack, plug your phone's cord into the modem's PHONE jack. NOTE: You cannot use the modem and phone at the same time if they share the same telephone line.

  • Page 43: Installing The Modem Drivers

    XTERNAL ODEM NSTALLATION WITH INDOWS Installing the Modem Drivers NOTE: If you wrote “950b” on page 4 of this User’s Guide, go to “Installing Modem Drivers with Windows 95 Version 950b” on page If you wrote “950” or “950a,” follow the instructions that begin below.
  • Page 44 XTERNAL ODEM NSTALLATION WITH INDOWS 2. When you see this screen, insert the 3. Once Windows finishes loading the Connections CD into your CD-ROM information from the CD-ROM, you should drive and type D:\ to replace the A:\. (If verify that the modem installation was a your CD-ROM drive has a different letter success.
  • Page 45 XTERNAL ODEM NSTALLATION WITH INDOWS 4. Double-click the Modems icon (circled in 5. In the “Modems Properties” screen, you the screen image below). should see your modem listed. This means the installation was a success.
  • Page 46 XTERNAL ODEM NSTALLATION WITH INDOWS 6. Next, click the Diagnostics tab at the top of the “Modems Properties” screen. Write down the COM setting for your modem below. (Your screen may show a different setting than that shown in the following screen.) You will need to know this setting when you install fax/data communications software.
  • Page 47 XTERNAL ODEM NSTALLATION WITH INDOWS Installing Modem Drivers with Windows 95 Version 950b 1. When Windows restarts, it should detect NOTE: If this screen does not the modem. Insert the Connections CD appear, go to the section titled “If Plug and click Next.
  • Page 48 XTERNAL ODEM NSTALLATION WITH INDOWS 3. Now you should verify that the modem 4. Double-click the Modems icon (circled in installation was a success. When your the screen image below). desktop returns, click the Windows Start button and point to Settings. Then click Control Panel.
  • Page 49 XTERNAL ODEM NSTALLATION WITH INDOWS 5. In the “Modems Properties” screen, you should see your modem listed. NOTE: If you do not see your modem listed in the preceding screen, the Plug and Play installation was unsuccessful. Please refer to the “If Plug and Play Does Not Detect Your Modem”...
  • Page 50 XTERNAL ODEM NSTALLATION WITH INDOWS You are now ready to install the Connections program group and register your modem online. Turn to “Software Installation” (page 47) for more information.

  • Page 51: Software Installation

    OFTWARE NSTALLATION This section explains running the Running the Setup Wizard U.S. Robotics Setup Wizard on the 1. From the Windows 95 desktop, click the ™ Connections Start button and then click Run. The Wizard will guide you through installing the Connections program group and testing your modem by registering online.

  • Page 52: Using Connections

    OFTWARE NSTALLATION 2. In the text box, type D:\setup.exe. 1. Insert the Connections CD into your CD- (If your CD-ROM drive has a letter name ROM drive. other than D, type that letter in place of D.) 2. Click Start, point to Programs, point to Then click OK.
  • Page 53 OFTWARE NSTALLATION 4. Follow the on-screen instructions to finish The Connections CD contains the RapidComm Voice fax/data/voice the installation. communications program. You can use this The CD also contains an electronic user’s software to transfer faxes and data files to manual for RapidComm Voice.

  • Page 54: Installing Other Fax/Data Software

    NSTALLING THER OFTWARE You can use fax/data/voice software other than KEY POINT: Refer to your software RapidComm Voice (the fax/data/voice manual for the program’s installation software on the Connections CD). Your instructions. The software’s installation modem was designed for and tested using a program will ask you questions about the wide range of communications software modem you are using.

  • Page 55: Flow Control

    NSTALLING THER OFTWARE Match the UART type listed in MSD with the Flow Control serial rate listed in the chart below. Select this For hardware flow control (highly serial rate (sometimes called the “port rate”) in recommended), select RTS/CTS. any communications software you use. For software flow control, select Select this XON/XOFF.

  • Page 56: Using Modem Station

    SING ODEM TATION What Does Modem Station Do? You may want to “tweak” your modem for optimum performance. Modem Station provides a simple to use interface that makes communicating with Installing Modem Station your modem easy. Modem Station allows you to point and If you did not install Modem Station when you click your way through configuration.
  • Page 57 SING ODEM TATION 6. You will be asked whether you wish to 9. When you see this screen, click Next to install Modem Station. Click Yes. accept the default directory or click Browse to change directories. 7. Wait a few moments for the Installation Wizard to load.
  • Page 58 SING ODEM TATION 10. Click Next on the following screen to 11. When you see the following screen, click accept the default program folder. You can Finish to complete the installation. place Modem Station in an existing folder by selecting one from the list. If this is the first time you’ve installed Modem Station, you may be asked to restart your computer.

  • Page 59: Starting Modem Station

    SING ODEM TATION Starting Modem Station The main menu gives you direct access to the following options: 1. If you did not start Modem Station from the Setup program, please start it now. DETECT NEW MODEMS 2. Click Windows Start button and then point This option detects U.S.
  • Page 60 SING ODEM TATION MODEM CONFIGURATOR Modem Configurator provides an easy-to-use TIP: For your convenience, we interface for entering hard-to-remember provide many on-line support commands. Use Modem Configurator for avenues. For specific questions, troubleshooting, initial configuration, and tuning our fax-on-demand service is a your modem for optimum performance.

  • Page 61: Using Detect New Modems

    SING ODEM TATION 2. Click Scan to have Modem Station check Using Detect New Modems for installed modems. This may take a few 1. Click Detect New Modems to bring up moments. the following screen. 3. When the scan finishes, you will see the following display.

  • Page 62: Using Terminal

    SING ODEM TATION modem and display make and model Modem Configurator without going back to information under the assigned port. All the main menu. Extended Information provides currently active ports should display “Port detailed information about your modem, OK” under the heading. If a port displays a previous connections, firmware dates, etc.
  • Page 63 SING ODEM TATION you to dial into Bulletin Boards, listing services, and other online services. NOTE: Modem Station’s Terminal window is provided primarily for troubleshooting convenience. If you frequently use BBSs, you will probably want to use a separate, full-featured Terminal program such as that provided in our RapidComm software.

  • Page 64: Using Modem Configurator

    SING ODEM TATION modem. We will discuss port speed settings in When you are finished using Terminal, click detail later in this section. Exit to return to the screen you accessed it from. Terminal includes a basic auto dialer. To have Terminal dial a number for you, click Using Modem Configurator Dial to bring up the “Dial”...
  • Page 65 SING ODEM TATION The Modem Configurator menu gives you FLOW CONTROL access to the following options: SERIAL PORT RATE For information on using these settings, please Data Control refer to the “Glossary” at the back of this This is the “Data Control” screen. manual.
  • Page 66 SING ODEM TATION TECHNICAL STUFF: switches are tiny switches that control a few basic functions on some external modems. On modems without DIP switches, these functions are handled by modem commands. In the upper left hand corner of this screen, Click Exit to return to the Modem you will find the current Connection Control Configurator menu.

  • Page 67: Using Modem To Computer

    SING ODEM TATION For detailed information about these settings, Once you have configured your Connection refer to the “Glossary” or the “Technical Quick Control settings, click Save to Modem to Reference” sections of this manual. save your settings. Using Modem to Computer TIP: On external modems, These settings control how your modem and...
  • Page 68 SING ODEM TATION If you look in the upper left hand corner of the display, you will see the commands currently in TIP: If you type ATDT and see use. ‘AATTDDTT’ on your screen, it is possible that both your software and The “Modem to Computer”...
  • Page 69 SING ODEM TATION CONNECTION RATES This screen allows you to configure the following settings: The “Connection Rates” screen allows you to configure modem speeds and protocols. MODULATIONS V.34 SYMBOL RATES WARNING! Use caution SPEEDS when changing connection Again, once you have selected your settings, settings.
  • Page 70 SING ODEM TATION DIALING/ANSWERING STORED NUMBERS The next screen allows you to adjust how your The “Stored Numbers” screen displays the modem initiates and receives calls. phone numbers currently stored in your modem’s memory. Use this screen to edit or add numbers stored in the modem’s memory.

  • Page 71: Using The Extended Information Screens

    SING ODEM TATION number when your computer is turned on or The last option, Restore Defaults, resets your when it is reset. This is very useful if you are modem to factory specifications. This option is using your modem with a “dumb terminal” or available from many of the screens within know that you need to connect to a specific Modem Station.
  • Page 72 SING ODEM TATION what you’ll see (and why it is important to you) DIAL/SECURITY as fully as possible. Winmodem users will have access to VxD There are a series of commands used to obtain information via these screens. Courier users detailed information from will have access to Dial/Security information.
  • Page 73 SING ODEM TATION modem you are using, click Product to bring To see information about the profile in use, up the next screen. click Active Profile to bring up the next screen. This screen contains information about your The “Product” screen displays the make and modem’s current configuration.
  • Page 74 SING ODEM TATION The two lines below the connection settings are Click Configuration to bring up the first of the advanced commands currently in use. these screens. Below them is a display of the contents of the ‘S-Registers’ for your modem. These registers are special programmable areas of your modem’s memory.
  • Page 75 SING ODEM TATION Options displays the protocols available to you for your Supervisor or EPROM date, your modem. look here. Fax Options displays your fax DSP Date is the date of the ‘firmware’ that compatibility. controls the DSP in your modem. Clock Frequency displays the speed of the Supervisor and DSP rev (or revisions) are tiny “clock”...
  • Page 76 SING ODEM TATION Symbol Rate displays the speed of the transmission. Trellis Code, Nonlinear Encoding, Shaping, and Precoding all refer to methods of handling high speed data transmission. The items followed by (dB), (-dB), (-dBm), and (msec) refer to variations in the modulation tones that actually carry the information.
  • Page 77 SING ODEM TATION last connection and this screen, the modem will clicking on VxD to view information on the not save these settings. Winmodem driver. Please refer to your Winmodem manual for detailed information on Only our U.S. Robotics Winmodems use the Winmodem drivers.

  • Page 78: Robotics Modem Update Wizard

    U.S. R OBOTICS ODEM PDATE IZARD The Connections CD-ROM includes the U.S. Robotics Modem Update Wizard. This NOTE: The following instructions software is designed to quickly update your apply to Windows 3.x and Windows 95 modem to the latest code. users.

  • Page 79: Updating Your Modem

    U.S. R OBOTICS ODEM PDATE IZARD 5. From the main Connections menu, click the Customer Support button. NOTE: For more detailed 6. Click the Modem Update Wizard button. instructions, see our World Wide Web page (http://www.3Com.com/56k). 7. Follow the on-screen instructions to complete the installation.

  • Page 80: Troubleshooting And Online Help Resources

    ROUBLESHOOTING AND NLINE ESOURCES PROBLEM DIAGNOSIS POSSIBLE SOLUTION The computer or software will If you are using an external The power switch is located on the back of the modem by the phone jacks. not recognize the modem. modem, the modem might not be turned on.
  • Page 81 ROUBLESHOOTING AND NLINE ESOURCES PROBLEM DIAGNOSIS POSSIBLE SOLUTION The modem displays double Both the modem’s and Disable Local Echo in your software OR on your modem (not both). Turn local characters on your monitor. software’s local character echo off on the modem by typing ATE0 and pressing ENTER in your software’s echoes are turned on.
  • Page 82 ROUBLESHOOTING AND NLINE ESOURCES PROBLEM DIAGNOSIS POSSIBLE SOLUTION The modem won’t go off hook Your software may not have Enable the auto answer feature. In the RapidComm Voice software’s Terminal to dial or doesn’t answer the auto answer enabled. mode, type ATS0=1 and press ENTER. NOTE: You need to enable auto answer phone.
  • Page 83 ROUBLESHOOTING AND NLINE ESOURCES PROBLEM DIAGNOSIS POSSIBLE SOLUTION Your modem won’t connect at The modem you’re trying to You can disable error control on your modem by typing AT&M0 in terminal mode 2400 bps with a 2400 bps connect with could be an and pressing ENTER.
  • Page 84 ROUBLESHOOTING AND NLINE ESOURCES PROBLEM DIAGNOSIS POSSIBLE SOLUTION Your communications You may have a bad phone Try placing the call again. The phone company routes calls differently each time. software is reporting many line. In terminal mode, type AT&F1 and press ENTER to load the optimum hardware flow cyclic redundancy check Optimum flow control settings control settings.
  • Page 85 ROUBLESHOOTING AND NLINE ESOURCES PROBLEM DIAGNOSIS POSSIBLE SOLUTION Your communications You may be trying to download a Download to an uncompressed area on your hard drive. software is reporting many file to a compressed area of your cyclic redundancy check hard disk.

  • Page 86: Rapidcomm Voice Troubleshooting Tips

    ROUBLESHOOTING AND NLINE ESOURCES PROBLEM: RapidComm Voice software does RapidComm Voice Software not work properly at 115.2 kbps. Troubleshooting Tips DIAGNOSIS: The presence of disk compression software on your system hampers PROBLEM: The lights in the RapidComm the RapidComm Voice software’s ability to work Voice software’s modem light monitor do not properly at 115.2 kbps.

  • Page 87: If Plug And Play Does Not Detect Your Modem

    ROUBLESHOOTING AND NLINE ESOURCES 2. Click Windows 95 Start, point to Settings, If Plug and Play Does Not Detect and click Control Panel. Double-click the Your Modem System icon and then click the Device Manager tab on the “System Properties” 1.

  • Page 88: Online Help Resources

    ROUBLESHOOTING AND NLINE ESOURCES Online Help Resources NOTE: ATDS0 (the last character is a Connecting to the 3Com BBS zero) automatically dials 1-847-982-5092, the 3Com BBS. To connect to the 3Com Bulletin Board System, follow these steps: If this is your first time connecting to our BBS, 1.
  • Page 89 ROUBLESHOOTING AND NLINE ESOURCES The BBS gives you access to customer and reference cards, and installation help. To obtain an technical support documents and the BBS library index of available documents, send a blank which contains hundreds of helpful files and tips to e-mail to support@usr.com.

  • Page 90: America Online

    ROUBLESHOOTING AND NLINE ESOURCES America Online 4. Type ATI7 and press ENTER. Go to the Keyword field and type 3COM to 5. The information that appears will be useful to connect to various 3Com resources, such as file the technical support representative who libraries, message boards, online customer attempts to troubleshoot your problem when support, and product announcements.

  • Page 91: Are You Still Having Problems

    ROUBLESHOOTING AND NLINE ESOURCES the modem, you will receive an SRO (Service Are You Still Having Problems? Repair Order) number. You must have an SRO Review this manual. number before returning the modem to us. Ship Call or visit your modem dealer. They may be the unit, postage paid, in a strong box made of able to assist you.

  • Page 92: Glossary

    LOSSARY answer mode Cross references are printed in boldface. Cross The mode used by your modem when answering references to items also found in the “Technical Quick Reference” chapter are printed in italics. an incoming call from an originating modem. The transmit/receive frequencies are the reverse of the analog loopback originating modem, which is in originate mode.

  • Page 93: Auto Dial

    LOSSARY auto dial ASCII A process where your modem dials a call for American Standard Code for Information you. The dialing process is initiated by sending Interchange. A code used to represent letters, an ATDT (dial tone) or ATDP (dial pulse) numbers, and special characters such as $, !, command followed by the telephone number.

  • Page 94: Bit Rate

    LOSSARY bit rate byte Also referred to as transmission rate. The A group of binary digits stored and operated number of binary digits, or bits, transmitted upon as a unit. Most often the term refers to 8- per second (bps). Communications channels bit units or characters.
  • Page 95 LOSSARY characters per second (CPS) cyclic redundancy checking (CRC) A data transfer rate generally estimated from An error-detection technique consisting of a the bit rate and the character length. For test performed on each block or frame of data example, at 2400 bps, 8-bit characters with by both sending and receiving modems.
  • Page 96 LOSSARY data compression table default A table containing values assigned for each Any setting assumed, at startup or reset, by the character during a call under MNP5 data computer's software and attached devices. The compression. Default values in the table are computer or software will use these settings continually altered and built during each call: until changed by the user or other software.
  • Page 97 LOSSARY digital loopback duplex A test that checks the modem's RS-232 Indicates a communications channel capable of interface and the cable that connects the carrying signals in both directions. See half terminal or computer and the modem. The duplex, full duplex. modem receives data (in the form of digital Electronic Industries Association (EIA) signals) from the computer or terminal, and...
  • Page 98 LOSSARY full duplex fax mode Signals can flow in both directions at the same The mode used by a modem to send and time over one line. In microcomputer receive data in facsimile format. See communications, may refer to the suppression definitions for V.17, V.27ter, V.29.
  • Page 99 LOSSARY ITU-T local echo An international organization that defines A modem feature that enables the modem to standards for telegraphic and telephone display keyboard commands and transmitted equipment. For example, the Bell 212A data on the screen. See command En. standard for 1200-bps communication in North America is observed internationally as Microcom Networking Protocol, an error-...
  • Page 100 LOSSARY modem online fall back/fall forward A device that transmits/receives computer data A feature that allows high-speed, error-control through a communications channel such as modems to monitor line quality and fall back to radio or telephone lines. It also changes signals the next lower speed in a defined range if line received from the phone line back to digital quality diminishes.
  • Page 101 LOSSARY parity A simple error-detection method that checks Random Access Memory. Memory that is the validity of a transmitted character. available for use when the modem is turned on, Character checking has been surpassed by but that clears of all information when the more reliable and efficient forms of error power is turned off.
  • Page 102 LOSSARY terminal Read Only Memory. Permanent memory, not A device whose keyboard and display are user-programmable. used for sending and receiving data over a communications link. Differs from a serial transmission microcomputer or a mainframe in that it has The consecutive flow of data in a single little or no internal processing capabilities.
  • Page 103 LOSSARY V.22 bis The ITU-T standard specification that covers An ITU-T standard for modem the initial handshaking process. communications at 2400 bps. The standard V.17 fax includes an automatic link negotiation fallback An ITU-T standard for making facsimile to 1200 bps and compatibility with Bell connections at 14,400 bps, 12,000 bps, 9,600 212A/V.22 modems.
  • Page 104 LOSSARY V.32 V.34+ An ITU-T standard for modem An enhancement to V.34 that enables data communications at 9600 bps and 4800 bps. transfer rates as high as 33,600 bps. V.32 modems fall back to 4800 bps when line V.42 quality is impaired. An ITU-T standard for modem V.32 bis communications that defines a two-stage...
  • Page 105 LOSSARY Xmodem Ymodem The first of a family of error control software An error-checking protocol that can send protocols used to transfer files between several files of data at a time in 1024-byte modems. These protocols are in the public (1K) blocks.

  • Page 106: Regulatory Information

    EGULATORY NFORMATION AND IMITED ARRANTY Manufacturer’s Declaration of received including interference that may cause undesired operations. Conformity Part 68: 3Com Corporation This equipment complies with FCC Rules Part 7770 North Frontage Road 68. Located on the bottom of the modem is Skokie, Illinois 60077-2690 the FCC Registration Number and Ringer U.S.A.
  • Page 107 95 U EFORE EGIN INDOWS SERS Industry Canada (IC) This equipment uses the following USOC jacks: RJ11C. This digital apparatus does not exceed the Class B limits for radio noise emissions from This equipment may not be used on coin digital apparatus set out in the interference- service provided by the telephone company.
  • Page 108 95 U EFORE EGIN INDOWS SERS Connecting to the Telephone Company computer or other electronic device, including fax machines, to send any message unless such It is not necessary to notify the telephone message clearly contains in a margin at the top company before installing the modem.
  • Page 109 95 U EFORE EGIN INDOWS SERS Radio and Television Interference correct the problem with one or more of the following measures: This equipment generates and uses radio frequency energy and if not installed and used Re-orient the receiving antenna (for properly, in strict accordance with the televisions with antenna reception only) or manufacturer’s instructions, may cause...
  • Page 110 95 U EFORE EGIN INDOWS SERS Washington, DC 20402 Before installing this equipment, users should ensure that it is permissible to be connected to In accordance with Part 15 of the FCC rules, the facilities of the local telecommunications the user is cautioned that any changes or company.
  • Page 111 95 U EFORE EGIN INDOWS SERS the supplier. Any repairs or alterations made telephone interface. The termination on an by the user to this equipment, or equipment interface may consist of any combination of malfunctions, may give the telecommunications devices subject only to the requirement that the company cause to request the user to sum of the Ringer Equivalence Numbers of all disconnect the equipment.
  • Page 112 95 U EFORE EGIN INDOWS SERS WARRANTY AND REPAIR SERVICE de raccordment. L’abonné ne doit pas oublier CENTER: qu’il est possible que la conformité aux conditions énoncées ci-dessus n’empêche pas Keating Technologies le dégradation du service dans certaines 25 Royal Crest Court, Suite 200 situations.

  • Page 113: Limited Warranty

    95 U EFORE EGIN INDOWS SERS particulièrement importante dans les régions externes), ou sur le circuit imprimé (modems rurales. internes). Avertissment: L’utilisateur ne doit pas tenter Centre de guarantie et de service après-vente: de faire ces raccordements luimême; il doit Keating Technologies avoir recours à...
  • Page 114 95 U EFORE EGIN INDOWS SERS Robotics’ option, without charge for either FOR A PARTICULAR USE OR parts or labor. This limited warranty shall PURPOSE. U.S. ROBOTICS SHALL IN not apply if the product is modified, NO EVENT BE LIABLE FOR ANY tampered with, misused, or subjected to SPECIAL, INDIRECT, INCIDENTAL, abnormal working conditions (including, but...
  • Page 115 95 U EFORE EGIN INDOWS SERS vary from state to state. Some states do not 3Com allow limitations on duration of an implied Attn: RMA warranty, or the exclusion or limitation of [your SRO#] incidental or consequential damages, so the 6201 W.

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