HOW TO USE THIS MANUAL

      This manual contains operating
      instructions for Courier V.32 bis,
      Courier HST, and Courier HST Dual
      Standard modems.  These modems have
      identical features except for the
      signaling they use to connect with
      remote modems at high speeds:  V.32/V.32
      bis or HST.  Courier HST Dual Standard
      modems use either type of signaling, de-
      pending on the type of remote modem.

      As you use the manual, keep the
      following guidelines in mind.

          The modem is shipped ready for most
           dial-up applications except for its
           flow control setting, which depends
           on the type of software and machine
           you're using.  After you've set up
           the modem and tested its operation
           (Chapter 2) review the Quick-Start
           instructions in Chapter 3 for brief
           configuration guidelines.
          If you've purchased a Courier V.32
           bis modem, disregard the
           instructions in this manual
           concerning HST operations.
           Conversely, if you've purchased a
           Courier HST modem, disregard the
           instructions concerning V.32/V.32
           bis operations.
          All Courier high speed modems
           connect automatically with remote
           modems operating at 14.4K/12K/9600/
           7200/4800/2400/1200/300/110 bps, as
           long as the remote modems observe
           the standards listed under
           Compatibility in Chapter 1.
           Courier HST modems also connect
           with other Courier HST modems at
           16.8K bps.

A NOTE ON COMMUNICATIONS SOFTWARE

      If you're using a computer rather than a
      terminal, you need communications
      software.  Many brands are available,
      all of which are based on the modem's AT
      command set.

      Some users prefer their communications
      software to take control of the modem,
      and are more comfortable with a program
      that makes the modem almost transparent.
      Others prefer a program that allows them
      to use the modem's AT command set some-
      times, and their software at other
      times, depending on the task at hand.
      Whichever you prefer, review at least
      the Quick Start (Chapter 3) so that you
      have a basic understanding of the
      modem's requirements and operation.
USER PATHS

      The paths shown in the diagram are
      suggestions only, designed for new and
      experienced users.  Note that there is
      no separate path for HST-mode or V.32
      bis-mode operation.

      Most users will be making asynchronous
      calls.  If you'll be making synchronous
      calls to a mainframe, you'll find all
      essential information in Chapter 7.
      However, you may find it helpful to
      review the more detailed operating
      instructions in other chapters as well.

             

             

             

             

             

             

             

             

             

             

             

             

             

             

             

             

             

             

             

             
      
      The USRobotics logo and HST are
      registered trademarks of U.S. Robotics,
      Inc.  Courier HST, Courier HST Dual
      Standard, Courier V.32 bis, Total
      Control, and Adaptive Speed Leveling
      (ASL) are trademarks of U.S. Robotics,
      Inc.  Apple is a registered trademark of
      Apple Computer, Inc.  Hewlett Packard
      3000 is a trademark of Hewlett Packard
      Company.  IBM PC, PC/XT, PC/AT and
      Systems Network Architecture (SNA) are
      trademarks of International Business
      Machines Corp.  Microcom Networking
      Protocol (MNP) is a trademark of
      Microcom, Inc.  Touch-Tone is a
      trademark of American Telephone and
      Telegraph.
      
                     COURIER HIGH SPEED MODEMS



              TABLE OF CONTENTS


     How to Use this Manual           ii
     Table of Contents                 v
     Limited Warranty                  x
     FCC Registration Numbers         xi
     Connecting to the Telephone Companyxi
     DOC (Canada)                     xi
     Radio and Television Interferencexii
     For Canadian Modem Users       xiii

     PART I.  INSTALLATION AND OPERATION
                       
     CHAPTER 1Features and Compatibility    
      Introduction                   1-1
      Compatibility                  1-4

     CHAPTER 2Set-Up and Testing       
      Package Components             2-1
      Operational Requirements       2-1
        RS-232 Requirements          2-2
      Front Panel Switches           2-3
      Front Panel Indicators         2-4
      Installing the Modem           2-4
      Testing the Installation       2-7

     CHAPTER 3Quick Start:  Asynchronous
     Calls                              
      Asynchronous/Synchronous Communication 3
      -1
      Initial Modem Settings         3-1
        Recommended Settings         3-2
        Alternative Settings         3-3
      Data Format                    3-4
      Storing Defaults in Nonvolatile Memory 3
      -5
      Dialing                        3-5
      Link Rate Negotiation          3-5
      Online Fallback                3-6

     CHAPTER 4Interface Controls       
      Terminology                    4-1

                       Table of Contents     v

COURIER HIGH SPEED MODEMS



      Changing Settings              4-2
      High Speed Modulation:  HST/V.32 bis   4
      -2
      Modulation at 2400 bps and Below4-3
      Throughput Guidelines          4-3
      Error Control                  4-5
        With Auto Answer             4-6
      Flow Control Overview          4-6
        Transmit Data Buffer Sizes   4-6
        Received Data Buffer Size    4-6
        Transmit Data Flow Control (&Hn)4-7
         When it is Required         4-7
         Hardware Control            4-7
         Software Control            4-7
         Guidelines                  4-8
        Received Data Flow Control   4-9
         Hardware Control (Rn)       4-9
         Software Control (&In)      4-9
         Guidelines                 4-11
      Data Compression (&Kn)        4-12
      Data Rate Commands            4-13
        Software Requirements       4-13
        DTE Rate Select (&Bn)       4-14
        Link Rate Select (&Nn)      4-15
        Guidelines for Low Speed Calls4-16
      Data Set Ready (&Sn)          4-16
      Data Terminal Ready (&Dn)     4-17
      Carrier Detect (&Cn)          4-17
      Rack Controller Unit Access (%Rn)4-18
      Touch-Tone Recognition (%Tn)  4-18

     CHAPTER 5Internal Controls        
      Setting/Using Defaults         5-1
        Writing Defaults to NVRAM (&W)5-1
        Loading the Factory Defaults (&F)    5
        -2
        Reset (Z)                    5-3
        Storing Telephone Numbers (&Zn=s)    5
        -3
      Result Codes                   5-4
        Response Modes (Vn)          5-4
        Quiet Mode (Qn)              5-5


vi    Table of Contents

                     COURIER HIGH SPEED MODEMS



        Additional Result Code Subsets (&An) 5
        -5
        Result Code Sets (Xn)        5-6
      Local Echo                     5-9
        Command Mode Local Echo (En) 5-9
        Online Local Echo (Fn)       5-9
      The Audio Monitor             5-10
        Speaker Control (Mn)        5-10
      Modem Clock Usage (Kn)        5-11



































                     Table of Contents     vii

COURIER HIGH SPEED MODEMS



      Transmitter Enable/Disable (Cn)5-11
      Break Handling (&Yn)          5-11
      S-Registers                   5-12

     CHAPTER 6Asynchronous Dialing and
     Answering                          
      Before Connecting              6-1
        Modulation/Standards         6-1
        Setting the Transmission Rate6-2
        Data Format                  6-2
        Error Control                6-2
      Placing Calls                  6-3
        Dial (D)                     6-3
        Cancel Dialing               6-3
        Dialing Type, Pulse or Tone  6-4
        Adaptive Dialing (X2-X7)     6-4
        Pause (,)                    6-4
        Slash (/)                    6-5
        Wait for Another Dial Tone (W)6-5
        Dial and Return to Command Mode (;)  6
        -5
        Dialing Letters (")          6-5
        Transferring Calls (!)       6-6
        Wait for an Answer (@)       6-6
        Reversing Originate/Answer Frequencies
        (R)                          6-7
        Dialing a Stored Number (DSn)6-7
      Redialing                      6-7
        Dial the Last Dialed Number (DL)6-8
        Re-execute the Last Command (A/)6-8
        Automated Redialing (>, A>)  6-8
         Continuous Repeat (>)       6-9
         Continuous Re-Execute (A>)  6-9
         Exiting Repeat Mode         6-9
      Escape Code Operations (+++)   6-9
        Modem Response to +++       6-10
      Returning Online (O)          6-11
      Hanging Up (Hn)               6-11
      Automatic Answering           6-11
        Suppressing Auto Answer     6-12
        Points to Remember          6-12
      International Calls           6-12
        Handshaking Options (Bn)    6-12

viii    Table of Contents

                     COURIER HIGH SPEED MODEMS



        Guard Tone (&Gn)            6-13
        Pulse Dial Make/Break Ratio (&Pn)    6
        -13









































                      Table of Contents     ix

COURIER HIGH SPEED MODEMS



     Chapter 7Synchronous Operations   
      Overview                       7-1
        Data Rate Synchronization    7-1
        Protocol Compatibility       7-1
      Requirements                   7-1
        What You Need to Know        7-2
        The RS-232 Interface         7-2
        The Synchronous Adapter Card 7-2
      Setting the Modem              7-3
        Modulation/Link Rate Guidelines7-3
        Flow Control Guidelines      7-4
        Transmit Clock Source (Xn)   7-4
        Synchronous Mode (&M1)       7-5
        Dialing Out                  7-5
        Answering                    7-5
        Hanging Up                   7-6
         Additional Terminology      7-6

     Chapter 8Queries and Help Screens 
      User Inquiries (In)            8-1
      S-Register Query (Sr?)         8-6
      Phone Number Query (&Zn?)      8-6
      Last-Dialed Number Inquiry (&ZL?)8-6
      Help Screens                   8-6
        Stop/Restart Display         8-6
        Cancel Display               8-6
        Basic Command Set ($)        8-7
        Extended Command Set (&$)    8-7
        Dialing (D$)                 8-8
        S-Register Functions (S$)    8-9
      
              PART II. REFERENCE
     
     Appendix ALink Negotiation (Handshaking)
       and Error Control                
      Link Negotiation (Handshaking) A-1
        HST Mode                     A-1
        V.32 bis Mode                A-3
        Dual Standard Handshaking    A-5
      Error Control and Throughput   A-5
      CCITT V.42 Handshaking         A-6
      MNP Handshaking                A-6
      Data Compression               A-6

x    Table of Contents

                     COURIER HIGH SPEED MODEMS



      Flow Control                   A-7
      Throughput Guidelines          A-7
       Achievable Throughput         A-9

     Appendix BSummaries and Tables    
      The RS-232 Interface           B-2
      Front Panel Indicators         B-4
      DIP Switch Summary             B-6
      Default Settings               B-9
      S-Register Summary            B-12
      ASCII Chart                   B-21

     Appendix CAlphabetical Command Summary 
      Basic Command Set              C-1
      Extended Command Set           C-6
      Percent Command Set           C-11

     Appendix DProblems and SolutionsD-1    
      If You Still Have Problems     D-4

     Appendix EAdditional Operations   
      Voice/Data                     E-2
      High Speed/Low Speed Protocol  E-5
      Dedicated Line and Leased Line Operation    
      E-8
      Hewlett Packard 3000 InstallationsE-11
      MI/MIC Operations             E-12

     Appendix FModem Testing           
      Testing with &T                F-1
        Ending a Test&T0, S18       F-1
        Analog Loopback&T1, &T8     F-2
        &T2                          F-4
        Digital Loopback&T3         F-4
        &T4, &T5                     F-5
        Remote Digital Loopback&T6, &T7F-5
      Testing with Register S16      F-8
        Analog LoopbackS16=1D       F-8
        Dial TestS16=2              F-9
        Test PatternS16=4           F-9
        Remote Digital LoopbackS16=8F-10

     Appendix GGlossary             G-1

                      Table of Contents     xi

COURIER HIGH SPEED MODEMS




     Appendix HTechnical SpecificationsH-1

     Index








































xii    Table of Contents

COURIER HIGH SPEED MODEMS



LIMITED WARRANTY

      U.S. Robotics, Inc., warrants to the
      original consumer or other end user
      purchaser that this product is free from
      defects in materials or workmanship for
      a period of two years from the date of
      purchase.  During the warranty period,
      and upon proof of purchase, the product
      will be repaired or replaced (with the
      same or similar model) at our option,
      without charge for either parts or
      labor.  This warranty shall not apply if
      the product is modified, tampered with,
      misused, or subjected to abnormal
      working conditions.

      
      REPAIR OR REPLACEMENT AS PROVIDED UNDER
      THIS WARRANTY IS THE EXCLUSIVE REMEDY OF
      THE PURCHASER.  THIS WARRANTY IS IN LIEU
      OF ALL OTHER WARRANTIES, EXPRESS OR
      IMPLIED, INCLUDING ANY IMPLIED WARRANTY
      OF MERCHANTABILITY OR FITNESS FOR A
      PARTICULAR USE OR PURPOSE, AND U.S.
      ROBOTICS SHALL IN NO EVENT BE LIABLE TO
      PURCHASER FOR INDIRECT OR CONSEQUENTIAL
      DAMAGES OF ANY KIND OR CHARACTER.
      

      Some states do not allow the exclusion
      or limitation of incidental or
      consequential damages or allow
      limitations on how long an implied
      warranty lasts, so the above limitations
      or exclusion may not apply to you. This
      warranty gives you specific legal
      rights, and you may also have other
      rights which vary from state to state.

      To obtain service under this warranty,
      contact the U.S. Robotics Technical
      Support Department at 800/982-5151 or by

x    Warranty

                     COURIER HIGH SPEED MODEMS



      mail at 8100 North McCormick Blvd.,
      Skokie, Illinois, 60076-2920.  You will
      be given a Return Materials
      Authorization (RMA) number to help us
      keep track of your warranty request.
      Once you have received your RMA number,
      take or mail the product, postage
      prepaid, to U.S. Robotics at the above
      address.  Include proof of the date of
      purchase.  IMPORTANT:  If you ship your
      unit, pack it securely, be sure your RMA
      number is visible on the outside of the
      package, and ship it charges prepaid and
      insured.

      Should you encounter problems in
      operating this device,  follow the
      instructions in Appendix D in Part II of
      this manual.  The Appendix contains
      solutions to operating problems as well
      as procedures to follow if there is an
      apparent modem malfunction.






















                             Warranty     page

                     COURIER HIGH SPEED MODEMS



FCC REGISTRATION

           FCC68:  CJE794-72748-MD-E
           RINGER EQUIVALENCE:  0.4B
           FCC15:  CJE-0147-151


DOC (CANADA)

      This digital apparatus does not exceed
      the Class B limits for radio noise
      emissions from digital apparatus set out
      in the radio interference regulations of
      the Canadian Department of
      Communications.

      Le present appareil numerique n'emet pas
      de bruits radio-electriques depassant
      les limites applicables aux appareils
      numeriques de la classe B prescrites
      dans le Reglement sur le brouillage
      radioelectrique edicte par le ministere
      des Communications du Canada.


CONNECTING TO THE TELEPHONE COMPANY

      It is not necessary to notify the
      telephone company before installing the
      modem.  However, the telephone company
      may request the telephone number(s) to
      which the Courier is connected and the
      FCC information printed above.

      If the telephone company has any
      questions or raises problems, ask them
      to call the Technical Support
      Department, USRobotics, Inc., 800/982-
      5151.

      If the modem is malfunctioning, it may
      affect the telephone lines.  In this
      case, disconnect the modem until the

                 Regulatory Information     xi

COURIER HIGH SPEED MODEMS



      source of the difficulty is traced.  Do
      not use the modem on party or coin
      telephone lines.









































xii    Regulatory Information

                     COURIER HIGH SPEED MODEMS



RADIO AND TELEVISION INTERFERENCE

      This equipment generates and uses radio
      frequency energy and if not installed
      and used properly, in strict accordance
      with the  manufacturer's instructions,
      may cause interference to radio and
      television reception.  Courier high
      speed modems have been tested and found
      to comply with the limits for a Class B
      computing device in accordance with the
      specifications in Part 15 of FCC rules,
      which are designed to provide reasonable
      protection against such interference in
      a residential installation.

      However, there is no guarantee that
      interference will not occur in a
      particular installation.  If this device
      does cause interference to radio or
      television reception, which you can
      determine by monitoring reception when
      the modem is on and off, try to correct
      the problem with one or more of the
      following measures.

         Reorient the receiving antenna.
         Relocate the computer with respect to
           the
           receiver.
         Relocate the computer and/or the
           receiver so
           that they are on separate branch
           circuits.

      If necessary, consult your dealer or an
      experienced radio/television technician
      for additional suggestions.  You may
      find the following booklet, prepared by
      the Federal Communications Commission,
      helpful:



               Regulatory Information     xiii

COURIER HIGH SPEED MODEMS



         How to Identify and Resolve Radio-TV
           Interference Problems
         Stock No. 004-000-0345-4
         U.S. Government Printing Office
         Washington, DC 20402
         
      In accordance with Part 15 of the FCC
      rules, any modification to or tampering
      with this device that causes harmful
      interference to others may be reason for
      prohibiting future operation.

































xiv    Regulatory Information

                     COURIER HIGH SPEED MODEMS



FOR CANADIAN MODEM USERS

      The Canadian Department of
      Communications (DOC) label identifies
      certified equipment.  This certification
      means that the equipment meets certain
      telecommunications network protective,
      operational, and safety requirements.
      The department does not guarantee the
      equipment will operate to a user's
      satisfaction.

      Before installing this equipment, make
      sure you are permitted to connect it to
      the facilities of the local
      telecommunications company.  You must
      also install the equipment using an
      acceptable method of connection.  In
      some cases, you may also extend the
      company's inside wiring for single line
      individual service by means of a
      certified connector assembly (telephone
      extension cord).  You should be aware,
      however, that compliance with the above
      conditions may not prevent degradation
      of service in some situations.

      Repairs to certified equipment should be
      made by an authorized Canadian
      maintenance facility designated by the
      supplier.  Any repairs or alterations
      made by a user to this equipment, or
      equipment malfunctions, may give the
      telecommunications company cause to
      request the user to disconnect the
      equipment.

      For your own protection, make sure that
      the electrical ground connections of the
      power utility, telephone lines, and
      internal metallic water pipe system, if
      present, are connected together.  This


                 Regulatory Information     xv

COURIER HIGH SPEED MODEMS



      precaution may be particularly important
      in rural areas.

      CAUTION:  Do not attempt to make such
      connections yourself; contact the
      appropriate electric inspection
      authority or electrician.

           Courier High Speed Modems Load
           Number:  41B

      The Load Number (LN) assigned to each
      terminal device denotes the percentage
      of the total load to be connected to the
      telephone loop used by the device,
      without overloading.  The  termination
      on a loop may consist of any combination
      of devices, subject only to the
      requirement that the total of the Load
      Numbers of all the devices not exceed
      100.  An alphabetic suffix is also
      specified in the Load Number for the
      appropriate ringing type (A or B), if
      applicable.  For example, LN = 41B
      designates a Load Number of 41 and a B-
      type ringer.


















xvi    Regulatory Information
