1、INTERNATIONAL TELECOMMUNICATION UNION ITU=T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU T.66 (03/2002) SERIES T: TERMINALS FOR TELEMATIC SERVICES Facsimile code points for use with Recommendations V.8 and V.8 bis ITU-T Recommendation T.66 ITU-T Recommendation T.66 Facsimile code points for use w
2、ith Recommendations V.8 and V.8 bis Summary This Recommendation defines the coding to be used in V.8 and V.8 bis negotiation to enable the selection of T.30 facsimile related capabilities. Source ITU-T Recommendation T.66 was revised by ITU-T Study Group 16 (2001-2004) and approved under the WTSA Re
3、solution 1 procedure on 29 March 2002. ITU-T Rec. T.66 (0312002) 1 FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The IT Telecommunication Standardization Sector TU-T) is a permanent organ of ITU. ITU-T is respons
4、ible for studying technical, 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 IT-
5、T study groups which, in tum, 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 IT-Ts purview, the necessary standards are prepared on a collaborative ba
6、sis with IS0 and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS IT draws attention to the possibility that the practice or implementation of
7、this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, vaiidity or applicability of claimed Intellectual Property Rights, whether asserted by IT members or others outside of the Recommendation development process. As of the da
8、te of approval of this Recommendation, IT had not received notice of intellectual property, protected by patents, 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
9、 the TSB patent database. o ITU 2002 AU rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. 11 ITU-T Rec. T.66 (03/2002) CONTENTS Page Scope References . Abbreviations Introduction Code points used with V.8 procedures
10、. Coding for V.8 information categories . 5.1 Code points used with V.8 bis procedures . 6.1 Coding for the Standard Information Field 6.2 Coding for the Standard Information Field - T.30 facsimile . Appendix I . Procedure for the assignment of additional T.66 parameters I . 1 Introduction 1.2 Proce
11、dure ITU-T Rec . T.66 (03/2002) 1 1 1 2 2 2 4 4 5 iii ITU-T Recommendation T.66 Facsimile code points for use w 1 Scope th Recommendations 8 and V.8 is This Recommendation defines the code points reserved in IT-T Recs. V.8 and V.8 bis for T.30 facsimile applications and further defines in successive
12、 octets the capabilities that may be negotiated. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommenda
13、tions and other references are subject to revision; users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid IT-T Recommendations is regularly publi
14、shed. - ITU-T Recommendation H.324 (1 996), Terminal for low bit-rate multimedia communication. ITU-T Recommendation T.30 (1 996), Procedures for document facsimile transmission in the general switched telephone network. ITU-T Recommendation T.39 (1997), Application profiles for simultaneous voice a
15、nd facsimile terminals. ITU-T Recommendation V.8 (2000), Procedures for starting sessions of data transmission over the public switched telephone network. ITU-T Recommendation V.8 bis (2000), Procedures for the identijkation and selection of common modes of operation between data circuit-terminating
16、 equipments (DCEs) and between data terminal equipments (DTEs) over the public switched telephone network and on leased point-to-point telephone-type circuits. ITU-T Recommendation V.34 (1998), A modem operating at data signalling rates of up to 33 600 bit/s for use on the general switched telephone
17、 network and on leasedpoint-to-point 2-wire telephone-type circuits. ITU-T Recommendation V.61 (1996), A simultaneous voice plus data modem, operating at a voice plus data signalling rate of 4800 bith, with optional automatic switching to data- only signalling rates of up to 14 400 bith, for use on
18、the general switched telephone network and on leased point-to-point 2-wire telephone type circuits. ITU-T Recommendation V.70 (1 996), Procedures for the simultaneous transmission of data and digitally encoded voice signals over the GSn or over a 2-wire leasedpoint-to- point telephone type circuits.
19、 - - - - - - - 3 Abbreviations This Recommendation uses the following abbreviations: ASVF CCITT DSVF Analogue simultaneous voice and facsimile communication International Telegraph and Telephone Consultative Committee Digital simultaneous voice and facsimile communication ITU-T RW. T.66 (0312002) 1
20、GSTN General Switched Telephone Network IS0 International Organization for Standardization ITU-T MS Mode Select International Telecommunication Union - Telecommunication Standardization Sector O O O O 4 Introduction ITU-T Recs. V.8 and V.8 bis define code points used in negotiating capabilities duri
21、ng connection establishment procedures. Certain of these codes have been reserved for definition and use by This Recommendation defines the code points as dedicated to T.30 facsimile and related applications and further defrnes in successive octets the capabilities that may be negotiated. ITU-T. 101
22、1oxxx 1 PSTN access 1lllOXXX 1 Non-standard facilities 111ooxxx 1 PCM modem availability 0111oxxx 1 Facsimile function, defined in Table 2 5 Code points used with V.8 procedures 5.1 Table 1 shows the bits b5, b6 and b7 on line 8 reserved for facsimile function in Table 2N.8. These bits are used to d
23、efine the call function categories. Coding for V.8 information categories Table 2 shows the call function categories defined by ITU-T 16. Table 2.66 - The facsimile function category 2 ITU-T Rec. T.66 (03/2002) Table 2L.66 - The facsimile function category NOTE - Reserved bits, when sent, should be
24、set to O and ignored by the receiver. 6 Code points used with V.8 bis procedures 6.1 Bit 5 of Table 6-2N.8 bis (Standard Information Field - (SPar(1) Coding) is indicated for use as “T.30 facsimile“. The accompanying Note specifies that the Level 2 and 3 Pars associated with this Spar( 1) are reserv
25、ed for allocation by IT-T. Table 3 defines the label of Bit 5 of Table 6-2N.8 bis (Standard znformation Field - (SPar(1) Coding) as T.30 Facsimile. Coding for the Standard Information Field Table 3R.66 - Standard Information Field - (SPar(1) coding I Spar( 1)s Defined in ITU-T Rec. V.8bis Defined in
26、 ITU-T Rec.V.8 bis Defined in IT-T Rec.V.8 bis Defined in ITU-T Rec.V.8 bis T.30 Facsimile Defined in IT-T Rec.V.8 bis Defined in ITU-T Rec.V.8 bis Defined in ITU-T Rec.V.8 bis 817 6 5 4 3 2 1 X X X X X 1 1 X X X X X X X O O 1 X X X 6.2 The coding of the first octet of the NPar(2) coding is shown in
27、 Table 4 codes. The T.30 procedures code point is applicable in the case where V.8 bis is used with facsimile/telephone switching (OutGoing Message - OGM) and no V.8 is forthcoming, i.e. T.30 modulation schemes that do not depend on V.8 for initiation. The other code point contains the modulation ty
28、pes which could be indicated with V.8 bis in the facsimile environment. Coding for the Standard Information Field - T.30 facsimile ITU-T Rec. T.66 (03/2002) 3 Table 4F.66 - Standard Information Field - T.30 facsimile (NPar(2) coding - Octet 1 NPar(2)s T.30 procedures (without V.8) V.34 (half duplex
29、mode) V.34 (duplex mode) V.61 (ASVF) V.70 (DSVF) Non-standard capabilities No parameters in this octet 8 7 X X X X X X X X X X X X X X 6 5 4 3 2 11 X X X X X 1 X X X X 1 X X X X 1 X X X X 1 X X X X 1 X X X X 1 X X X X X O O O O O O The coding of second octet of the Group 3 facsimile Standard Informa
30、tion Field is used to indicate other capabilities, as shown in Table 5 codes. Table 5F.66 - Standard Information Field - T.30 facsimile (NPar(2) coding - Octet 2 I NPar(2)s I 8 7 H.324 (MSVF) Extended negotiation method MS initiated session (Note) Reserved for experimental use by the Telecommunicati
31、ons Industry Association (USA) Reserved for allocation by ITU-T Reserved for allocation by ITU-T No parameters in this octet I X X X X X X X X X X X X X X 6 5 4 3 lI X X X X X 1 X X X X 1 X X X X 1 X X X X 1 X X X X 1 X X X X 1 X X X X X O O O O O O I NOTE - Session initiated by the responding termi
32、nal. I Appendix I Procedure for the assignment of additional T.66 parameters 1.1 Introduction This appendix defines the procedure for requesting the assignment of T.66 parameters that are indicated as being “Reserved for allocation by the ITU-T“. This procedure is intended to allow for the expedient
33、 assignment of such parameters. This procedure does not cover requests for changes to the information category octets (which requires approval by ITU-T), or changes to the overall structure of ITU-T Rec. T.66 (which requires application of the ITU-T Resolution 1 procedures). 4 ITU-T Rec. T.66 (03120
34、02) 1.2 Procedure An ITU-T working party or study group that identifies a need for the assignment of a T.66 parameter initiates the procedure by making that request to the Chairman of the Study Group responsible for IT-T Rec. T.66 with copies of the request to the Rapporteur of IT-T Rec. T.66 and th
35、e appropriate TSB Counsellor. After consultation with the Rapporteur of ITU-T Rec. T.66, the Chairman will either approve the request or provide an alternative solution to the request (if a change is necessary to achieve compliance with ITU-T Rec. T.66). It is expected that requests using this proce
36、dure will obtain a response within one month. The changes should be published in an Implementors Guide to ITU-T Rec. T.66. ITU-T Rec. T.66 (03/2002) 5 SERIES OF ITU-T RECOMMENDATIONS Series A Series B Series C Series D Series E Series F Series G Series H Series I Series J Series K Series L Series M
37、Series N Series O Series P Series Q Series R Series S Series T Series U Series V Series X Series Y Series Z Organization of the work of IT-T Means of expression: definitions, symbols, classification General telecommunication statistics General tariff principles Overall network operation, telephone s
38、ervice, service operation and human factors Non-telephone telecommunication services Transmission systems and media, digital systems and networks Audiovisual and multimedia systems Integrated services digital network Cable networks and transmission of television, sound programme and other multimedia
39、 signals Protection against interference Construction, installation and protection of cables and other elements of outside plant TMN and network maintenance: international transmission systems, telephone circuits, telegraphy, facsimile and leased circuits Maintenance: international sound programme a
40、nd television transmission circuits Specifications of measuring equipment Telephone transmission quality, telephone installations, local line networks Switching and signaliing Telegraph transmission Telegraph services terminal equipment Terminals for telematic services Telegraph switching Data communication over the telephone network Data networks and open system communications Global information infiastructure and Internet protocol aspects Languages and general software aspects for telecommunication systems Printed in Switzerland Geneva, 2002
