UCL facsimile system
RFC 809

Document Type RFC - Unknown (February 1982; No errata)
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INDRA Note 1185                                            INDRA

Feb. 1982                                                 Working
                                                           Paper

RFC 809

                      UCL FACSIMILE SYSTEM

                           Tawei Chang

     ABSTRACT:  This note describes the features  of
                the  computerised  facsimile  system
                developed  in  the   Department   of
                Computer  Science at UCL.  First its
                functions  are  considered  and  the
                related    experimental   work   are
                reported. Then the  disciplines  for
                system    design    are   discussed.
                Finally, the implementation  of  the
                system are described, while detailed
                description are given as appendices.

                 Department of Computer Science

                   University College, London



      NOTE: Figures 5 and 6 may be obtained by sending a request to
      Ann Westine at USC-Information Sciences Institute, 4676 Admiralty
      Way, Marina del Rey, California, 90291 (or WESTINE@ISIF) including
      your name and postal mailing address.  Please mention that you are
      requesting figures 5 and 6 from RFC 809.

      OR: You can obtain these two figures online from the files

          <NETINFO>RFC809a.FAX   and   <NETINFO>RFC809b.FAX

      from the SRI-NIC online library.  These files are in the format
      described in RFC 769.



UCL FACSIMILE SYSTEM                              INDRA Note 1185

                            Contents

  1. INTRODUCTION...........................................1

  2. SYSTEM FUNCTIONS.......................................2

     2.1 Communication......................................4
     2.2 Interworking with Other Equipment..................8
        2.2.1 Facsimile machines............................8
        2.2.2 Output Devices................................9
     2.3 Image Enhancement..................................11
     2.4 Image Editing......................................15
     2.5 Integration with Other Data Types..................16

  3. SYSTEM ARCHITECTURE....................................17

     3.1 System Requirements................................17
     3.2 Hierarchical Model.................................19
     3.3 Clean and Simple Interface.........................20
        3.3.1 Principles....................................21
        3.3.2 Synchronisation and Desynchronisation.........21
        3.3.3 Data Transfer.................................22
     3.4 Control and Organisation of the Tasks..............22
        3.4.1 Command Language..............................23
        3.4.2 Task Controller...............................23
     3.5 Interface Routines.................................26
        3.5.1 Sharable Control Structure....................26
        3.5.2 Buffer Management.............................27

  4. UCL FACSIMILE SYSTEM...................................28

     4.1 Multi-Task Structure...............................29
     4.2 The Devices........................................29
     4.3 The Networks.......................................30
     4.4 File System........................................31
     4.5 Data Structure.....................................32
     4.6 Data Conversion....................................34
     4.7 Image Manipulation.................................35
     4.8 Data Transmission..................................39

  5. CONCLUSION.............................................41

     5.1 Summary............................................41
     5.2 Problems...........................................42
     5.3 Future Study.......................................46




UCL FACSIMILE SYSTEM                              INDRA Note 1185

     Appendix I:   Devices

     Appendix II:  Task Controller and Task Processes

     Appendix III: Utility and Data Formats

     Reference




     1. INTRODUCTION

       The object of a  facsimile  system  is  to  reproduce
     faithfully  a document or image from one piece of paper
     onto another piece of paper  sited  remotely  from  the
     first  one.  Up  to  now,  the main method of facsimile
     communication has been via the telephone network.  Most
     facsimile  machines permit neither the storage of image
     page nor their modification before  transmission.  With
     such  machines,  it is almost impossible to communicate
     between different makes of facsimile machines. In  this
     respect,   facsimile   machines   fall   behind   other
     electronic communication services.

       Integration of  a  facsimile  service  with  computer
     communication  techniques  can bring great improvements
     in service. Not only is the reliability and  efficiency
     improved   but,  more  important,  the  system  can  be
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