1、INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU TERMINALS FOR TELEMATIC SERVICES T.1 O1 (1 1 /94) INTERNATIONAL INTERWORKING FOR VIDEOTEX SERVICES ITU-T Recommendation T.lO1 (Previously “CCITT Recommendation”) FOREWORD The IT-T (Telecommunication Standardi
2、zation Sector) is a permanent organ of the International Telecommunication Union (M). The K-T is responsible for studying technical, operating and tariff questions and issuing Recommen- dations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication
3、Standardization Conference (WTSC), which meets every four years, establishes the topics for study by the ITU-T Study Groups which, in their turn, produce Recommendations on these topics. The approval of Recommendations by the Members of the ITU-T is covered by the procedure laid down in WTSC Resolut
4、ion No. 1 (Helsinki, March 1-12, 1993). IT-T Recommendation T.lO1 was revised by ITU-T Study Group 8 (1993-1996) and was approved under the WTSC Resolution No. 1 procedure on the 1 lth of November 1994. NOTE In this Recommendation, the expression “Administration” is used for conciseness to indicate
5、both a telecommunication administration and a recognized operating agency. O IT 1995 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU.
6、 CONTENTS Page . Summary X Scope Normative references . Abbreviations . Interworking between Videotex services: General International interworking of Videotex services 5.1 International interworking configurations 5.2 Gateway to gateway interworking 5.3 Terminal to host interworking International in
7、terworking between gateways International interworking at network level 6.3 Session layer . 6.4.1 Presentation protocol 6.1 6.2 Transport layer 6.4 Presentation layer Coding of Videotex information . 6.5 Application layer 6.4.2 6.6 Relationship with DTAM/ODA International interworking between a term
8、inal and a host . 7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8. 7.9 Access via PSTN or ISDN bearer service Access via PSPDN or ISDN bearer service Access via PSPDNPAD . Access via PSPDN through a VIU . Access via PSPDN through a VSU 7.6.1 Charging 7.6.3 Identification . 7.6.4 Language-Management . 7.6.5 Data-Syn
9、tax-Management 7.6.6 Error-Message . Coding State table for charging events received at VSU side . 7.9.1 Used abbreviations 7.9.2 State table 7.9.3 Collision Application rules for Recommendation X.29 to support administrative functions 7.6.2 Limit handling . ASN.l encoding of the Administrative comm
10、ands of Terminal to Host interworking 1 2 4 4 5 5 5 5 5 6 6 6 6 6 6 7 7 8 8 9 9 10 11 11 12 14 14 15 15 15 15 16 18 18 20 20 Content architecture class attributes . 20 8.1 Content architecture class . 20 8.2 Content type 20 Recommendation T.lO1 (11/94) I Page 9 Content portion attributes . 21 9.1 Ty
11、pe of coding 21 9.2 Specific coding attributes 21 9.2.1 Subset 22 9.2.2 Rank 22 9.2.3 Profile 22 10 Formal definition of Videotex dependent data type . 22 10.1 Introduction 22 10.2 Summary of ASN.l object identifiers . 23 11 Common enhancements to data syntaxes I. II and III 11.1 Terminal identifier
12、 11.1.1 1 1.1.3 Audio capabilities . 11.2 IS0 9281 support 11.3 Abnormal truncation of data . Terminal identification command response messages 11.1.2 Modem capability . 11.1.4 Photographic capabilities 12 Definition of VideotexString within ASN.l 12.1 General 12.2 Definition of VideotexString 12.3
13、ASN.1 syntax element definition Annex A . Interworking Data Syntax (IDS) described in ASN . 1 (Recommendation X.208) A . 1 Videotex page . A.2 State vector . A.2.1 Vector definition . A.2.2 Reset state vector A.2.3 NULL A.3 Functions and parameters . A.3.0 Alpha char string . A.3.2 Kana char string
14、A.3.1 Special char string . A.3.3 Kanji char string A.3.4 Block mosaic string . A.3.6 Special mosaic string A.3.5 Smooth mosaic string A.3.7 Format effector CO-ch ar A.3.8 Special format-C0-char . A.3.9 General control characters A.3.10 Geometric string A.3.11 Animation control string . A.3.13 Colou
15、r control string . A.3.14 Text colour string Photographic string synthetic image . Photographic string natural image A.3.18 DRCS string Fill pattern control string . A.3.20 Music string A.3.21 Telesoftware string A.3.12 Segment control string A.3.15 A.3.16 A.3.17 Macro A.3.19 A.3.22 Audio data strin
16、g . 24 24 24 25 26 27 28 30 30 30 32 32 32 32 33 33 36 36 36 37 37 37 37 37 38 38 39 39 39 51 59 60 62 63 65 67 68 69 71 72 73 73 ii Recommendation T.lO1 (11/94) Appendix I . Text and mosaic character repertoires . Repertoire I - Common alphanumeric text characters 1.1.1 Latin alphabetic characters
17、I . 1.2 Non-alphabetic characters . Repertoire 2 - Special alphanumeric text characters Repertoire 3 - Kana characters . Repertoire 4 - Kanji characters Repertoire 5 - Greek characters Repertoire 6 - Cyrillic characters . Repertoire 7 - Block mosaic characters Repertoire 8 - Sub cell aligned smooth
18、mosaics 1 . Repertoire 9 - General smooth mosaics . Repertoire 10 - Drawing characters . Repertoire 11 - Special mosaics . Appendix II - Default states of the interworking data syntax . 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 1.10 1.1 1 Annex B - Data Syntax I for international interactive Videotex serv
19、ice Preface . B.l B . 2 B.3 B . 4 General B.l.l Scope B.1.2 References . B.1.3 Definitions . B.1.4 Visual information display B.1.5 Sound information Coding architecture . B.2.1 General B.2.2 Mode switching technique B.2.3 Coding structure in the character code mode B.2.4 Coding structure in the tra
20、nsparent mode . B.2.5 Coding structure in the sound mode . B.2.6 Coding structure in the message mode Coding in the character code mode . B.3.1 CO Control Set . B.3.2 C1 Control Set . B.3.3 Display control command set B.3.4 Character Sets . B.3.5 Mosaic Sets . B.3.6 Dynamically Redefinable Character
21、 Sets (DRCSs) B.3.7 Macro Set B.3.8 Picture Description Instruction (PDI) Set . B.3.9 Moving Instruction (MVI) Set Coding in the transparent mode B.4.1 Photographic Data Unit (PDU) B.4.2 LINE DOT PATTERN . B.4.3 Lm DOT PATTERN COMPRESSED B.4.4 FIELD DOT PATTERN . B.4.5 FIELD DOT PATTERN COMPRESSED B
22、.4.6 COLOURING BLOCK B.4.7 COLOURING BLOCK COMPRESSED . B.4.8 FIELD COLOURING BLOCK B.4.9 FIELD COLOURING BLOCK COMPRESSED . B.4.10 FREE FORMAT COLOURING BLOCK i.4.11 PHOTO DRCS 1 AND PHOTO DRCS 2 Recommendation T.lO1 (11/94) Page 73 73 73 75 77 77 78 79 79 80 81 83 83 84 85 90 90 90 90 90 90 92 95
23、95 95 95 96 99 100 101 101 101 103 108 125 125 125 137 138 139 142 142 143 143 148 149 150 150 152 154 157 157 . 111 B.5 B.6 B . 7 B.4.12 Telesoftware B.4.13 PCM photography . B.4.14 ABTC photography . B.4.15 ADCT photography Coding in the sound mode B.5.1 General B.5.2 Sound tone set . B.5.3 Sound
24、control set . Terminal identification . B.6.1 Introduction . B.6.2 General structure . B.6.3 Details for Data Syntax I terminals . Default conditions . Appendix I . Service Reference Model (SRM) Appendix II - Operation of CS and NSR Appendix III - Adaptive block truncation coding . 111.1 Introductio
25、n 111.2 Adaptive block truncation coding (ABTC) algorithm 111.3 ABTC decoding algorithm Annex C - Data Syntax II for international interactive Videotex service . General C.l Introduction C . 1.1 C . 1.2 Coding principles Display principles . C.2 References . C.3 Definitions Part 1 - Alphamosaic disp
26、lay c . 1 c.2 c.3 Description C.1.1 Introduction . C.1.2 Theoretical Terminal Model . C.1.3 Defined Attributes and Qualified Areas C.1.4 Rules for the Action of the SIZE Attribute . C.1.5 Defaults . Repertory C.2.1 Character Repertoire . C.2.2 Format Effector Repertoire . C.2.3 Attribute Control Rep
27、ertoire . C.2.4 Device control function repertoire C.3.1 Code extension and invocation ; C.3.2 C.3.3 The supplementary control function sets C.3.4 The coding of graphic characters C.3.5 Supplementary attribute and qualified area controls . C.3.6 Device controls . C.3.7 Designation and invocation in
28、the 7-bit environment . C.3.8 Designation and invocation in the %bit environment . Coding Structure . The Primary control function set Appendix i . Identification system . Appendix II . Example of time dependency in the unified alphamosaic model . Page 161 162 163 164 165 165 165 171 175 175 175 176
29、 177 178 179 180 180 180 185 187 187 187 187 188 189 189 190 190 190 191 192 195 195 198 198 224 225 234 235 235 231 239 245 279 281 282 282 285 287 iv Recommendation T.lO1 (11/94) Part 2 . Geometric displays . Part 3 . Photographic display Part 4 . Define Dynamically Redefinable Character Sets (DRC
30、S) . Part 5 . Define COLOUR . Part 6 - Define FORMAT Part 7 - TRANSPARENT Data Part 8 -RESET Part 9 - Telesoftware . . Part 10 - Terminal Facility Identifier Part 11 - Timing Control . Annex D - International Interworking for Videotex Services Data Syntax III . Preface . D . 1 D.2 D.3 D.4 D.5 D.6 D.
31、7 D.8 D.9 Scope Definitions Reference Publications . D.3.2 ANSI Standards D.3.3 CSA Standards D.3.4 CCIR Report . D.3.5 CCITT Recommendations D.3.6 Department of Communication, Canada . D.3.7 EINCVCC Recommendation 1983 , . D.3.8 IS0 Standards . Coding Architecture D.4.1 Reference Model (OSI) . D.4.
32、2 Presentation Level Overview D.4.3 Code Extension . D.4.4 SPACE and DELETE . Coding of G-sets . D.5.1 Primary character set . D.5.2 Supplementary character set . D.5.3 D.5.4 Mosaic set . D.5.5 Macro set . D.5.6 D.6.1 CO control set D.6.2 C1 control set Picture Description Instruction (PDI) set Dyna
33、mically Redefinable Character Set RCS) . Coding of C-sets . Graphic character repertoire . Conformance requirements . . D.8.1 General D.8.2 Conforming interchange . Enhanced Capabilities . D.8.3 Conforming Presentation Process . Appendix I . Layered Architecture Model Appendix II - Coordinate System
34、 Concepts . Appendix III - Code extension and 7-biV8-bit transform . Appendix IV - A general Service Reference Model (SRM) for Videotex and a general Service Reference Model (SRM) for Teletext Recommendation T.lO1 (1lf94) Page 289 409 434 443 447 448 449 452 562 575 585 585 586 586 589 589 589 589 5
35、89 589 589 590 590 590 590 592 598 598 598 600 602 646 647 648 648 648 651 657 670 670 671 471 672 674 675 677 678 V . ITU-T RECMN*T*LOL 94 - 48b2593 ObOLL27 368 Page Addendum to Data Syntax III for international interactive videotex service (1993) . : 687 Preface . 687 1 2 3 4 5 6 7 8 9 10 11 12 13
36、 14 15 16 Underline Absence of operands on PDIs RESET PDI. NON-SELECTIVE RESET (NSR) AND ACTIVE POSITION SET (APS) . Cursors . Macro linkages . Logical pel dimensions . Word wrap INCREMENTAL commands . Unprotected fields Cursor and macro . Proportional spacing of text . 11.1 Width tables 11.2 The di
37、splacement function 11.4 The function Text sizes O I DX e 12/256 Character field sizes . Code extension . 11.3 Features of the function 11.5 11.6 Text sizes DX 2 12/256 13.1 Subclause D.4.3.1.1 13.2 Subclause D.4.3.1.2 13.3 Subclause D.4.3.2 . 13.4 Figures D.4 and D.6 ISO/IEC 928 1 support Alignment
38、 with Recommendation T.51 . 15.1 Subclause D.5.2 15.2 FigureD.8 . 15.3 Repertoire . NO BREAK SPACE and SOFT HYPHEN Terminal identification . 15.4 Annex E -Audio data syntax E.l Introduction E.2 Scope E.3 Normative references ES Symbols and abbreviations . E.4 Definitions E.6 Overview E.7 Introducer
39、ISO/IEC 9281 SI syntax and switching structure Overall switching of coding environment . E.8 E.8.1 E.8.2 E.8.3 Switching into the Audio Mode ISODEC 9281 SI syntax stnicture 687 687 687 687 688 688 688 688 688 688 689 689 689 690 690 690 691 692 692 692 692 693 694 696 698 698 699 701 703 703 704 704
40、 705 705 705 706 706 706 706 706 708 708 vi Recommendation T.lO1 (11/94) . . ITU-T RECMN*T-LOL 74 4862.591 ObOLL28 2T4 E.9 E.10 E.11 E.12 Introduction F . 1 F.2 F.3 F.4 F.5 F.6 F.7 F.8 F.9 F . 10 F.ll F . 12 Sound header E.9.1 Introduction . E.9.2 Header structure E.9.3 Default values . Sound block
41、Application rules for ISDN syntax-based Videotex . E.ll.l Encodinghitrate combinations . E.l 1.2 Translation mechanisms Translation modes . E . 12.1 Mode O (no translation is performed) . E . 12.2 Mode 1 (No translation except US) E . 12.3 Mode 2 (3411-4 coding) . E.12.4 Mode 3 (Shift scheme - 8 bit
42、s) . E.12.5 Mode 4 (Shift scheme - 7 bits) . E.12.6 Mode 5 (No translation except specific characters) Annex F . Photographic data syntax . . Scope Normative references . Definitions and abbreviations . F.3.1. Definitions . F.3.2 Abbreviations Overview ISOAEC 928 1, Part 1, syntax and switching stru
43、cture . F.5.1 Overall switching of coding environment . F.5.2 F.5.3 ISO/IEC 9281, Part 1, syntax structure . Coding of the Picture Data Entity (PDE) F.6.1 Introduction F.6.2 PDE data content identification mechanism . Switching into the photographic mode . Photographic header . F.7.1 Introduction .
44、F.7.2 Header structure F.7.3 Header functionalities . Coding rules F.8.1 Purpose F.8.2 General rules for coding the header F.8.3 Photographic header code assignment F.8.4 Encoding of photographic header parameters . F.9.1 Introduction . F.9.2 Translation modes . Defaults . F.lO. 1 F.10.2 Default tab
45、les Photographic profiles F.l 1.1 Compatible photographic profiles (Pi to P5) . F.11.2 Combination rule Photographic data . : . Default values for photographic header attributes Private choice of photographic profile (P,n, ) . Recommendation T.lO1 (11/94) Page 709 709 709 711 711 712 712 712 712 712
46、 712 712 713 714 714 715 715 715 716 717 717 719 720 720 720 722 722 723 723 724 725 725 725 727 742 742 742 749 750 754 754 755 755 755 758 768 770 772 772 vii Appendix I . Photovideotex tutorial . 1.1 Introduction 1.2 The present state of photovideotex . 1.3 Image representation . 1.4 The PEG comp
47、ression technique 1.4.1 Lossy and lossless compression 1.4.3 The DCT-based coding . 1.4.4 Lossless coding . 1.4.5 1.4.6 Data organization and signalling parameters 1.5 The baseline system 1.4.2 Modes of encoding Source images and data interleaving . 1.6 The extended system . Coding model for success
48、ive approximation Coding model for spectral selection 1.6.1 1.6.2 1.6.3 Hierarchical encoding . 1.7 Summary . 1.8 Bibliography . Page 773 773 773 774 775 775 776 777 782 782 783 783 783 783 783 784 784 784 Appendix II . Implementation guidelines on display rendering . 785 11.1 Introduction 785 11.2
49、Rendering of resolution 785 II.2.1 Resolution independence 785 11.2.2 Display rendering guidelines for Data Syntax II profiles . 787 11.2.3 Display rendering for Data Syntax III profiles . 789 11.3 The concept of normalised colour space . 790 Appendix III . Solutions for common compatible photovideotex databases serving different resolution terminals 111.1 Introduction 111.2 Hierarchical mode . 111.2.1 Coding 111.2.2 Decoding . 111.2.3 Example for a “resolution pyramid” for hierarchical build-up . 111.3 Special spectral selection II.3.1 Coding III.3.2 Decod
