Modem Tutorial

Contents

• Introduction
• Modulation Protocols
  • 2400 bps modems
  • High-speed modems
    • V.32
    • V.32bis
    • U.S. Robotics HST
    • Telebit PEP
    • Hayes Express 96
    • CompuCom CSP
  • Things to come
    • V.fast
    • ISDN
• Error Control Protocols
  • V.42 and MNP-4
  • V.42 & MNP-4 can provide error-free connections
  • V.42 and MNP-4 can improve throughput
  • Are MNP 4/V.42 useful?
• Data Compression Protocols
  • MNP-5 & V.42bis
  • Are MNP-5 & V.42bis useful?
  • Compression by Software vs. MNP-5/V.42bis
  • Local Flow Control and Data Buffering
  • Macintosh and high-speed modems
  • PC and UART
• Profiles of High-speed modems
  • ATI 9600etc/e
  • CompuCom SpeedModem Champ/Star/Storm
  • Hayes modems
  • Image Communications: Twincom 96/42
  • Intel 9600EX & 14.4EX
  • Practical peripherals PM9600SA & PM9600
  • Prometheus modems
  • Telebit modems
  • U.S. Robotics modems
  • Zoom V.32 Turbo Modems
  • Things to come
• Buying a High-speed Modem
  • Should you pay the extra for a V.32bis modem?
  • Should you buy a modem with a proprietary modulation protocol?
  • Should you buy a 2400 bps modem with V.42bis?
  • Beware of the ads
• Setting Up Software to Work with High-speed Modems
  • The Proper Software Setup
  • Does Your Software Initialize the Modem Properly?
  • Does Your Software Configure Itself to Match the Modem Settings?
  • Why You May Need to Change the Initialization String
  • Editing the Initialization String
  • Match Software Settings To the Modem Settings
• Configuring Popular Communications Software to Work with High-speed Modems
  • Procomm 2.0
  • Telix
  • Qmodem
  • HyperAccess 5
  • Crosstalk for Windows
  • MicroPhone II (for Macintosh)
  • ZTerm (for Macintosh)
• Other Settings for Your Communications Software
  • Telephone Number
  • Dial String: ATDT
  • 8-N-1 or 7-E-1 (data bits-parity-stop bits)
  • Half vs. Full Duplex: Local Echo
  • Terminal Emulation
  • Comm Port
  • File Transfer Protocols
    • ASCII
    • Xmodem
    • Xmodem-1K
    • Ymodem
    • Ymodem-g
    • Zmodem
    • Kermit
    • Sealink
    • Which file transfer protocol should you use?
• Appendix A: Resources
• Appendix B: How to reach the author
• Appendix C: About "The Joy of Telecomputing"