COURIER HIGH SPEED MODEMS







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




                                                                 1

           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.









ii    How to Use This Manual



                     COURIER HIGH SPEED MODEMS










                                                                 2



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.
















                                                                 3



































                How to Use This Manual     iii



COURIER HIGH SPEED MODEMS







USER PATHS



      The paths shown in the diagram are

      suggestions only, designed for new and




                                                                 4

      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.




































                                                                 5



























iv    How to Use This Manual






























                                                                 6


























































                                                                 7







      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






                                                                 8



     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




                                                                 9

      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




                                                                 10

        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




                                                                 11

        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






                                                                 12


























































                                                                 13















                     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




                                                                 14

        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




                                                                 15

      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


































                                                                 16





















































                      Table of Contents     ix




                                                                 17



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




                                                                 18

      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








                                                                 19



      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




                                                                 20

      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






                                                                 21

     Index
























































                                                                 22





























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




                                                                 23

      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




                                                                 24

      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




                                                                 25

      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.




































                                                                 26













                             Warranty     page



                     COURIER HIGH SPEED MODEMS







FCC REGISTRATION



           FCC68:  CJE794-72748-MD-E

           RINGER EQUIVALENCE:  0.4B

           FCC15:  CJE-0129





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.




                                                                 27



      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




                                                                 28

      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.




































                                                                 29



















































xii    Regulatory Information






                                                                 30

                     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




                                                                 31

      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










                                                                 32

         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.




































                                                                 33



































xiv    Regulatory Information



                     COURIER HIGH SPEED MODEMS







FOR CANADIAN MODEM USERS



      The Canadian Department of

      Communications (DOC) label identifies




                                                                 34

      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




                                                                 35

      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.






                                                                 36

           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.






















                                                                 37



















xvi    Regulatory Information






































                                                                 38
