SPORTSTER 14,400
                           CHAPTER 1.  FEATURES AND COMPATIBILITY
                                                                 
      
MODEM FEATURES

      The following features and capabilities
      assure you of superior reliability and
      performance from your USRobotics modem.
   Error Control_V.42/MNP 2O4
      Data integrity is ensured when Sportster
      14,400  modems con-nect with remote
      modems that use the V.42 (LAPM) or MNP
      error-control protocols.  Error control
      is available on calls at 1200 bps and
      above.
   Data Compression_V.42 bis/MNP 5
      Data compression enables throughput of
      up to 57,600 bits per second (bps) on
      14,4K bps connections.  The data
      compression technique used depends on
      the remote modem's capabilities.  If the
      modems connect under V.42 error control,
      they can use V.42 bis compression.  If
      they connect under MNP error control,
      they can use MNP Level 5 compression.
      Achievable throughput for text files and
      other file types is listed at the end of
      Appendix A.
   Flow Control/Variable Interface Rates
      Flow control, required under error
      control, allows the rate at the computer
      interface to be set higher than the rate
      over the phone line.  This feature
      provides greater efficiency and
      throughput.  If your computer and
      software support the higher rate, you
      can transfer data between the computer
      and modem at 38,400 bps, regardless of
      the phone line rate.
   Fax Capability_Sportster 14,400 Fax Modems
      If you've chosen to purchase a Sportster
      modem with fax capabilities, you can use
      your modem in Class 1 facsimile mode for
      sending or receiving faxes.
   Programmable Nonvolatile Memory
      You can tailor your own default settings
      and store them in nonvolatile random
      access memory (NVRAM).  As long as DIP
      switch 7 is set UP, the Sportster 14,400
      operates at the settings you've
      specified each time the computer is
      powered on or reset.
   Link Rate Negotiation
      The Sportster 14,400  automatically
      lowers its connection rate to match a
      remote modem's lower rate, in both
      Originate and Answer modes.  This allows
      connections with a wide range of in
      stalled modems.  When answering higher
      speed calls, the modem also shifts back
      up again.
   Modem Diagnostics
      The modem performs three loopback tests:
      analog, digital, and remote digital.
      See Appendix F for information.
   Inactivity Timer
      You can set the modem to automatically
      hang up after a specified number of
      minutes if there is no data activity on
      the line.
   Call Progress Detection
      An optional set of result codes (screen
      messages) lets you know when a line is
      busy or there is no dial tone.
   Modem Settings Display
      On command, the modem displays its
      current settings, a handy way to check
      your transmission rate, S-Registers and
      other operational controls.  The modem
      also displays the defaults stored in
      nonvolatile memory and the factory
      defaults stored permanently in read-only
      memory.
   HELP Screens
      The modem displays screens that
      summarize the command sets, Dial command
      options, and S-Register functions.
   Bottom Panel Reference
      Summaries of important commands and
      other information are printed on the
      bottom of the modem case.  A Dual In-
      Line Package (DIP) switch guide makes it
      easy to tailor the switch settings to
      your terminal and software requirements.
   Stored Phone Number
      Write your most frequently used phone
      number to NVRAM.  Then type a brief
      command to have the modem dial the
      number.
   Quote Mode
      Set the modem to Quote mode if you want
      it to dial an alpha-betic acronym
      instead of a number.
      
COMPATIBILITY

      The Sportster 14,400 conforms to the
      following standards, ensuring
      compatibility with a wide base of
      installed modems.
       CCITT V.32 bis
                    14.4K/12K/9600/7200/4800
                    bps
       CCITT V.32  9600/4800 bps
       CCITT V.22 bis    2400 bps
       Bell 212A   1200 bps (also CCITT V.22)
       CCITT V.23  1200 bps with 75 bps back
                    channel (British phone
                    system)
       Bell 103    300 bps (CCITT V.21
                    optional)
       CCITT V.42  LAPM error control, 1200
                    bps and higher
       CCITT V.42 bis    Data compression,
                    1200 bps and higher
       MNP         Levels 2, 3 and 4 error
                    control, level 5 data
                    compression, 1200 bps and
                    higher
       CCITT V.54  Analog, digital and remote
                    digital loopback testing
       Fax Modems
       TIA/EIA-578 Service Class 1
                    Asynchronous Facsimile
                    DCE Control Standard
       CCITT V.29  9600/7200 bps
       CCITT V.27 ter    4800/2400 bps
       CCITT V.21  300 bps
      Other compatibility features include the
      following standards and certification:
         ù Can be used with any computer or
           terminal that is com-patible with
           the RS-232 standard interface.
         ù Can be used with any computer or
           terminal that uses ASCII, the
           standard character code supported
           by most equipment manufacturers.
         ù Is UL-listed, fully FCC-, DOC- and
           CSA-certified for the uses
           described in this manual.