1、 International Telecommunication Union ITU-T T.30TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (09/2005) SERIES T: TERMINALS FOR TELEMATIC SERVICES Procedures for document facsimile transmission in the general switched telephone network ITU-T Recommendation T.30 ITU-T Rec. T.30 (09/2005) i ITU-T R
2、ecommendation T.30 Procedures for document facsimile transmission in the general switched telephone network Summary This Recommendation defines the procedures used by Group 3 facsimile terminals as defined in ITU-T Rec. T.4. These procedures enable documents to be transmitted on the general switched
3、 telephone network, international leased circuits and the Integrated Services Digital Network (ISDN). Further, these procedures allow communication to be manual or automatic and for document transmission to be requested alternatively with telephone conversation. With this revision, the colour spaces
4、 defined in ITU-T Rec. T.30 will be aligned with those in ITU-T Rec. T.44. Additionally, the scope and applicability of T.30 and T.44-based facsimile applications are expanded. The following methods are defined for introducing T.44 YCC colour space to T.30. 1) New negotiation bit 119 “T.44 colour sp
5、ace“ is added with new Note 83. 2) Note 39 (for bit 74 custom illuminant) and Note 40 (for bit 75 custom gamut range) are modified to reflect the addition of bit 119. Source ITU-T Recommendation T.30 was approved on 13 September 2005 by ITU-T Study Group 16 (2005-2008) under the ITU-T Recommendation
6、 A.8 procedure. ii ITU-T Rec. T.30 (09/2005) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying t
7、echnical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups whi
8、ch, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and
9、 IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to
10、 ensure e.g. interoperability or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equivalents are used to express requirements. The use of such words d
11、oes not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concern
12、ing the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had received notice of intellectual property, protected by patents,
13、 which may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. ITU 2006 All rights reserved. No part of this publication may be reproduced, by any mea
14、ns whatsoever, without the prior written permission of ITU. ITU-T Rec. T.30 (09/2005) iii CONTENTS Page 1 Scope 1 1.1 General . 1 1.2 Classification of operating methods . 1 1.3 Terminal identification . 2 1.4 General provisions 2 1.5 Optional provisions 3 1.6 References 3 2 Terms and definitions .
15、4 2.2 Time sequence of a facsimile call 4 2.3 Description of phases . 5 3 Description of a facsimile call 6 3.1 Phase A Call establishment . 6 3.2 Phases B, C and D Facsimile procedure 6 3.3 Phase E Call release. 7 4 Tonal signal functions and formats. 14 4.1 Automatic answer sequence . 14 4.2 Calli
16、ng tone (CNG) 15 5 Binary coded signalling procedure . 15 5.1 Description . 16 5.2 Flow diagrams Figures 5-2a to 5-2x (see also Appendix IV) . 17 5.3 Binary coded signal functions and formats 43 5.4 Binary coded signalling implementation requirements 78 6 Use of the modulation system defined in ITU-
17、T Rec. V.34. 80 6.1 Procedures 80 Annex A Procedure for G3 document facsimile transmission in the general switched telephone network incorporating error correction 82 A.1 Introduction 82 A.2 Definitions 83 A.3 Block size and frame size . 83 A.4 Information field (see also 5.3.6) . 84 A.5 Flow contro
18、l procedure. 89 A.6 Procedure interrupt . 90 A.7 Flow diagrams 91 A.8 Signal sequence examples in case of error correction procedure. 91 Annex B BFT diagnostic message 101 B.1 Introduction 101 B.2 Normative references 102 B.3 Definitions 102 iv ITU-T Rec. T.30 (09/2005) Page B.4 Signals and componen
19、ts for BFT file transfer operations 102 B.5 Service models for BFT negotiations. 102 B.6 Signals and components for BFT negotiations. 103 B.7 Procedures for BFT negotiations 105 B.8 Presentation of BFT negotiations data . 106 Annex C Procedure for Group 3 document facsimile transmission on the Integ
20、rated Services Digital Network or on the GSTN using duplex modulation systems 108 C.1 Introduction 108 C.2 Definitions 109 C.3 Facsimile procedure 110 C.4 Flow control procedure. 113 C.5 Flow diagrams 113 C.6 Signal sequence examples 135 C.7 Procedures for using Annex C within analog transmission en
21、vironments. 158 Annex D Optional automatic terminal selection procedures 159 Annex E Procedure for the Group 3 document facsimile transmission of continuous-tone colour images 162 E.1 Introduction 162 E.2 Definitions 162 E.3 Normative references 163 E.4 Negotiation procedure 163 Annex F Procedures f
22、or Group 3 facsimile transmission using the half-duplex modulation system defined in ITU-T Rec. V.34 164 F.1 Introduction 164 F.2 References 164 F.3 Procedures 164 F.4 Half-duplex operating procedures of ITU-T Recs V.34 and V.8 for Group 3 facsimile 166 F.5 Examples of sequences. 166 Annex G Procedu
23、res for secure Group 3 document facsimile transmission using the HKM and HFX system . 183 G.1 Introduction 183 G.2 Outline of the secure facsimile document procedure . 183 G.3 References 184 G.4 Definitions 184 G.5 Abbreviations . 184 G.6 Facsimile procedures 185 G.7 Flow diagrams 188 G.8 Flow diagr
24、ams 209 G.9 Signal sequence examples in case of secure facsimile procedure 224 ITU-T Rec. T.30 (09/2005) v Page Annex H Security in facsimile G3 based on the RSA algorithm 229 H.1 Preamble. 229 H.2 Introduction 229 H.3 References 229 H.4 Security mechanisms 229 H.5 Security parameters 234 H.6 Exchan
25、ges of security parameters 236 Annex I Procedure for the Group 3 document facsimile transmission of colour and gray-scale images using T.43 . 271 I.1 Introduction 271 I.2 Definitions 272 I.3 Normative references 272 I.4 Negotiation procedure 273 Annex J Procedure for Group 3 document facsimile trans
26、mission of Mixed Raster Content (MRC) images. 274 J.1 Scope 274 J.2 References 274 J.3 Definitions 274 J.4 Image representation 274 J.5 Layer transmission order 276 J.6 Negotiation . 276 J.7 Application requirements summary . 277 Annex K Procedure for the Group 3 document facsimile transmission of c
27、ontinuous-tone colour and gray scale images (sYCC). 278 K.1 Introduction 278 K.2 Definitions 279 K.3 References 279 K.4 Negotiation procedure 280 Appendix I Index of abbreviations used in this Recommendation . 280 Appendix II List of commands and appropriate responses. 282 Appendix III Alternative p
28、rocedures used by some terminals which conform to the pre-1996 versions of this Recommendation 283 III.1 Alternative automatic answering sequence 283 III.2 Optional binary coded preamble 284 Appendix IV Signal sequence examples. 285 Appendix V Procedure for binary file transmission with protocol exa
29、mples. 298 V.1 Introduction 298 V.2 Definitions 299 V.3 BFT file transfer-protocol overview. 299 V.4 ECM-BFT data format . 299 vi ITU-T Rec. T.30 (09/2005) Page V.5 Simple BFT negotiation via Phase C method. 300 V.6 Extended BFT Negotiation via Phase B Method . 302 Appendix VI Mixed Raster Content e
30、xamples . 304 Appendix VII Application rules for use of V.8 with Group 3 facsimile 307 VII.1 Introduction 307 VII.2 Application rules 307 Appendix VIII Examples for Internet routing/polling 308 VIII.1 Internet routing using email fax through onramp and offramp gateways 308 VIII.2 Internet routing us
31、ing real-time fax 310 VIII.3 Internet polling . 310 ITU-T Rec. T.30 (09/2005) vii Introduction i) This Recommendation is intended to apply to document facsimile terminals covered by ITU-T Rec. T.4. It describes the procedures and signals to be used where facsimile terminals are operated over the gen
32、eral switched telephone network. When an existing terminal is operating in a non-ITU-T manner, it shall not interfere with a terminal operating in accordance with the T-series Recommendations. ii) Arrangements for automatic calling/answering on the general switched telephone network have been aligne
33、d as closely as possible with those described in the V-series Recommendations for data terminal equipment. The answering procedures for multifunction terminal configurations are contained in Annex D. iii) While there are eight possible operating methods (see Table 1), each may be described by five s
34、eparate and consecutive phases: Phase A: Call set-up. Phase B: Pre-message procedure for identifying and selecting the required facilities. Phase C: Message transmission (includes phasing and synchronization where appropriate). Phase D: Post-message procedure including end-of-message and confirmatio
35、n and multi-document procedures. Phase E: Call release. iv) For digital document facsimile terminals conforming to ITU-T Rec. T.4, the binary coded system defined in this Recommendation shall be the standard signalling arrangement. v) The binary coded signalling system is based on a High Level Data
36、Link Control (HDLC) format developed for data transmission procedures. The basic HDLC structure consists of a number of frames, each of which is subdivided into a number of fields. It provides for frame labelling, error checking and confirmation of correctly received information and the frames can b
37、e easily extended if this should be required in the future. vi) The transmission of the facsimile message itself (phase C) will be according to the modulation system described in the appropriate Recommendation for the facsimile terminal. ITU-T Rec. T.30 (09/2005) 1 ITU-T Recommendation T.30 Procedur
38、es for document facsimile transmission in the general switched telephone network1The ITU-T, considering a) that facilities exist for facsimile transmission over the general switched telephone network; b) that such facsimile transmission may be requested either alternatively with telephone conversati
39、on or when either or both terminals are not attended; c) that for this reason the operations involved in establishing and/or releasing a facsimile call should be capable of automatic operation, unanimously declares the view that the facsimile terminal should be designed and operated according to the
40、 following standards. 1 Scope 1.1 General 1.1.1 This Recommendation is concerned with the procedures which are necessary for document transmission between two facsimile terminals in the general switched telephone network. These procedures essentially comprise the following: call establishment and ca
41、ll release; compatibility checking, status and control command; checking and supervision of line conditions; control functions and facsimile operator recall. 1.1.2 Only the procedures with their corresponding signals are specified in this Recommendation. 1.2 Classification of operating methods 1.2.1
42、 This Recommendation regulates the operational sequence of manually operated facsimile terminals as well as of automatic terminals. The automatic facsimile terminal is understood to be a terminal which is capable of performing all procedures (listed in 1.1) automatically. In this case, an operator i
43、s not necessary. If, however, an operator is required for any of these procedures, the terminal must be regarded as a manually operated terminal. 1.2.2 Based upon all combinations which may result from the fact that there are manually operated terminals and automatic facsimile terminals, the operati
44、ng methods shown in Table 1 are possible. _ 1Facsimile terminals referred to as Group 3 in this Recommendation are those conforming to ITU-T Rec. T.4. 2 ITU-T Rec. T.30 (09/2005) Table 1/T.30 Method No. Description of operating method Direction of facsimile transmission Overall designation Manual op
45、eration at calling terminal and Calling terminal transmits to called terminal 1-T 1 Manual operation at called terminal Calling terminal receives from called terminal 1-R Manual operation at calling terminal and Calling terminal transmits to called terminal 2-T 2 Automatic operation at called termin
46、al Calling terminal receives from called terminal 2-R Automatic operation at calling terminal and Calling terminal transmits to called terminal 3-T 3 Manual operation at called terminal Calling terminal receives from called terminal 3-R Automatic operation at calling terminal and Calling terminal tr
47、ansmits to called terminal 4-T 4 Automatic operation at called terminal Calling terminal receives from called terminal 4-R Automatic operation using the procedures defined in ITU-T Rec. V.8 at calling terminal and Calling terminal transmits to called terminal using the procedures defined in ITU-T Re
48、c. V.8 4-T 4 bis Automatic operation using the procedures defined in ITU-T Rec. V.8 at called terminal Calling terminal receives from called terminal using the procedures defined in ITU-T Rec. V.8 4-R NOTE There may also be operating methods which will allow messages to be received by more than one
49、terminal (multipoint connection). 1.3 Terminal identification 1.3.1 For the purpose of classifying an automatic facsimile terminal as a non-speech terminal, a tone must be transmitted to line. As both automatic calling and called facsimile terminals transmit tones to line during call establishment, a normal telephone user who becomes inadvertently connected to one will receive tone signals for a period of sufficient duration to indicate clearly to him that he is incorrectly connected. 1.3.2 Additionally an automatic
