1、 International Telecommunication Union ITU-T A.12TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (10/2008) SERIES A: ORGANIZATION OF THE WORK OF ITU-T Identification and layout of ITU-T Recommendations Recommendation ITU-T A.12 Rec. ITU-T A.12 (10/2008) i Recommendation ITU-T A.12 Identification and
2、 layout of ITU-T Recommendations Summary This Recommendation provides information on the means on assigning the letter series designations for ITU-T Recommendations. Source Recommendation ITU-T A.12 was prepared by TSAG (2005-2008) and approved by the World Telecommunication Standardization Assembly
3、 (Johannesburg, 21-30 October 2008). ii Rec. ITU-T A.12 (10/2008) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunication Standardization Sector
4、(ITU-T) is a permanent organ of ITU. ITU-T is responsible 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 fo
5、ur years, establishes the topics for study by the ITU-T study groups which, 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, th
6、e necessary standards are prepared on a collaborative basis with ISO and 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.
7、However, the Recommendation may contain certain mandatory provisions (to 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 negati
8、ve equivalents are used to express requirements. The use of such words does 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
9、 of a claimed Intellectual Property Right. ITU takes no position concerning 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,
10、 ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www
11、.itu.int/ITU-T/ipr/. ITU 2009 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T A.12 (10/2008) iii CONTENTS Page 1 Scope 1 2 Identification and layout of Recommendations . 1 Rec. ITU-T A.12 (10/2008) 1
12、 Recommendation ITU-T A.12 Identification and layout of ITU-T Recommendations (2000; 2004; 2008) 1 Scope The Telecommunication Standardization Advisory Group (TSAG) periodically reviews the methods of identifying and laying out Recommendations as well as the Authors Guide for drafting ITU-T Recommen
13、dations, prepared and updated by the Telecommunication Standardization Bureau (TSB), providing thus detailed guidelines on format and style. This Recommendation provides principles that are applied in identifying and laying out Recommendations. 2 Identification and layout of Recommendations 2.1 All
14、Recommendations of the ITU Telecommunication Standardization Sector (ITU-T) shall be numbered. The number of each Recommendation shall have a letter prefix referring to the series as well as a number identifying the particular subject in that series. The numbering shall be done in a manner that perm
15、its clear, unequivocal identification and facilitates electronic storage of information concerning the Recommendation. The Recommendation number shall be associated on the cover with the date of approval in the format YYYY. The month may be added if required for uniqueness. 2.2 The scope of the seri
16、es identified by the letter shall be as follows: A Organization of the work of ITU-T B Not allocated C Not allocated D General tariff principles E Overall network operation, telephone service, service operation and human factors F Non-telephone telecommunication services G Transmission systems and m
17、edia, digital systems and networks H Audiovisual and multimedia systems I Integrated services digital network J Cable networks and transmission of television, sound programme and other multimedia signals K Protection against interference L Construction, installation and protection of cables and othe
18、r elements of outside plant M Telecommunication management, including TMN and network maintenance N Maintenance: international sound-programme and television-transmission circuits O Specifications of measuring equipment P Telephone transmission quality, telephone installations, local line networks Q
19、 Switching and signalling R Telegraph transmission S Telegraph services terminal equipment T Terminals for telematic services 2 Rec. ITU-T A.12 (10/2008) U Telegraph switching V Data communication over the telephone network W Not allocated X Data networks, open system communications and security Y G
20、lobal information infrastructure, Internet protocol aspects and next-generation networks Z Languages and general software aspects for telecommunication systems 2.3 Recommendations in each series shall be classified in sections, according to subject. 2.4 The title of each Recommendation should be con
21、cise (preferably no more than one line) but unique, meaningful and unambiguous. The details identifying the precise intent and coverage should be contained in the text where possible (e.g., under “Scope“ clause). 2.5 The date of formal approval of the Recommendation, the study group(s) responsible f
22、or its approval and a record of revisions shall be clearly indicated. 2.6 The author of a new or revised Recommendation shall provide, in front of the main body of the Recommendation, a summary as outlined in the “Authors Guide for drafting ITU-T Recommendations“. The author may also provide other u
23、p-front elements, such as background information and keywords, as provided for in the Authors Guide. 2.7 The “Authors Guide for drafting ITU-T Recommendations“ should be applied in drafting new Recommendations and, wherever practicable, in revising existing Recommendations. Printed in Switzerland Ge
24、neva, 2009 SERIES OF ITU-T RECOMMENDATIONS Series A Organization of the work of ITU-T Series D General tariff principles Series E Overall network operation, telephone service, service operation and human factors Series F Non-telephone telecommunication services Series G Transmission systems and medi
25、a, digital systems and networks Series H Audiovisual and multimedia systems Series I Integrated services digital network Series J Cable networks and transmission of television, sound programme and other multimedia signals Series K Protection against interference Series L Construction, installation a
26、nd protection of cables and other elements of outside plant Series M Telecommunication management, including TMN and network maintenance Series N Maintenance: international sound programme and television transmission circuits Series O Specifications of measuring equipment Series P Telephone transmis
27、sion quality, telephone installations, local line networks Series Q Switching and signalling Series R Telegraph transmission Series S Telegraph services terminal equipment Series T Terminals for telematic services Series U Telegraph switching Series V Data communication over the telephone network Series X Data networks, open system communications and security Series Y Global information infrastructure, Internet protocol aspects and next-generation networks Series Z Languages and general software aspects for telecommunication systems
