Internet Fax T.30 Feature Mapping
RFC 2880

Document Type RFC - Informational (August 2000; No errata)
Last updated 2013-03-02
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Network Working Group                                        L. McIntyre
Request for Comments: 2880                             Xerox Corporation
Category: Informational                                         G. Klyne
                                                    Content Technologies
                                                             August 2000

                   Internet Fax T.30 Feature Mapping

Status of this Memo

   This memo provides information for the Internet community.  It does
   not specify an Internet standard of any kind.  Distribution of this
   memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2000).  All Rights Reserved.

Abstract

   This document describes how to map Group 3 fax capability
   identification bits, described in ITU T.30 [6], into the Internet fax
   feature schema described in "Content feature schema for Internet fax"
   [4].

   This is a companion to the fax feature schema document [4], which
   itself defines a profile of the media feature registration mechanisms
   [1,2,3], for use in performing capability identification between
   extended Internet fax systems [5].

Table of Contents

   1. Introduction .............................................3
      1.1 Organization of this document ........................3
      1.2 Terminology and document conventions .................3
      1.3 Discussion of this document ..........................4
   2. Combining feature tags ...................................4
      2.1 Relationship to Group 3 fax ..........................5
      2.2 Feature set descriptions .............................5
      2.3 Examples .............................................5
        2.3.1 Data resource example ............................6
        2.3.2 Recipient capabilities example ...................6
   3. Survey of media-related T.30 capability bits .............6
      3.1 DIS/DTC bit 15 (resolution) ..........................6
      3.2 DIS/DTC bit 16 (MR coding) ...........................7
      3.3 DIS/DTC bits 17,18 (width) ...........................7
      3.4 DIS/DTC bits 19,20 (length) ..........................7

McIntyre & Klyne             Informational                      [Page 1]
RFC 2880           Internet Fax T.30 Feature Mapping         August 2000

      3.5 DIS/DTC bit 31 (MMR coding) ..........................7
      3.6 DIS/DTC bit 36 (JBIG multi-level coding) .............8
      3.7 DIS/DTC bit 37 (plane interleave) ....................8
      3.8 DIS/DTC bits 41,42,43 (resolution) ...................8
      3.9 DIS/DTC bits 44,45 (preferred units) .................9
      3.10 DIS/DTC bit 68 (JPEG) ...............................9
      3.11 DIS/DTC bit 69 (colour) .............................9
      3.12 DIS/DTC bit 71 (bits/sample) .......................10
      3.13 DIS/DTC bit 73 (no subsampling) ....................10
      3.14 DIS/DTC bit 74 (custom illuminant) .................10
      3.15 DIS/DTC bit 75 (custom gamut) ......................10
      3.16 DIS/DTC bits 76,77 (paper size) ....................11
      3.17 DIS/DTC bit 78 (JBIG bi-level coding) ..............11
      3.18 DIS/DTC bit 79 (JBIG stripe size) ..................11
      3.19 DIS/DTC bit 92,93,94 (MRC maximum functional mode) .11
      3.20 DIS/DTC bit 95 (MRC stripe size) ...................12
      3.21 DIS/DTC bit 97 (resolution) ........................12
      3.22 DIS/DTC bit 98 (resolution) ........................12
   4. Summary of T.30 capability dependencies .................12
      4.1 Image coding ........................................13
        4.1.1 Bi-level coding .................................13
        4.1.2 Multi-level coding ..............................14
        4.1.3 MRC format ......................................14
      4.2 Resolution and units ................................15
      4.3 Colour capabilities .................................17
      4.4 Document size .......................................18
   5. Mapping T.30 capabilities to fax feature schema .........18
      5.1 Image coding ........................................20
        5.1.1 Bi-level coding .................................20
        5.1.2 Multi-level coding ..............................21
        5.1.3 MRC format ......................................23
      5.2 Resolution and units ................................23
      5.3 Colour capabilities .................................24
      5.4 Document size .......................................26
   6. Examples ................................................26
      6.1 Common black-and-white fax machine ..................27
        6.1.1 Corresponding Internet fax capabilities .........29
      6.2 Full-featured color fax machine .....................30
   7. Security Considerations .................................34
   8. Acknowledgements ........................................34
   9. References ..............................................34
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