1、 I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n U n i o n ITU-T A.12 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (11/2016) 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 (11/2016) i Recommendat
2、ion ITU-T A.12 Identification and layout of ITU-T Recommendations Summary Recommendation ITU-T A.12 provides information on the means on assigning the letter series designations for ITU-T Recommendations. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T A.12 2000-10-06 TSAG 1
3、1.1002/1000/5279 2.0 ITU-T A.12 2004-10-14 TSAG 11.1002/1000/7422 3.0 ITU-T A.12 2008-10-30 TSAG 11.1002/1000/9643 3.1 ITU-T A.12 (2008) Cor.1 2015-06-05 TSAG 11.1002/1000/12526 3.2 ITU-T A.12 (2008) Cor.2 2016-02-05 TSAG 11.1002/1000/12786 4.0 ITU-T A.12 2016-11-02 TSAG 11.1002/1000/13164 Keywords
4、Identification, layout, letter series designation. * To access the Recommendation, type the URL http:/handle.itu.int/ in the address field of your web browser, followed by the Recommendations unique ID. For example, http:/handle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-T A.12 (11/2016) FOREWORD Th
5、e 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 (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying techni
6、cal, 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 which, i
7、n 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 IEC.
8、 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 ensu
9、re, 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 does
10、 not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTSITU 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 concerning
11、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 not received notice of intellectual property, protected by patents,
12、 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.itu.int/ITU-T/ipr/. ITU 2017 All rights reserved. No part of this publicati
13、on may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T A.12 (11/2016) 1 Recommendation ITU-T A.12 Identification and layout of ITU-T Recommendations 1 Scope The Telecommunication Standardization Advisory Group (TSAG) periodically reviews the methods of
14、 identifying and laying out Recommendations as well as the Authors Guide for drafting ITU-T Recommendations, 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
15、 identifying and laying out Recommendations. 2 Identification and layout of Recommendations 2.1 All 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
16、identifying the particular subject in that series. The numbering shall be done in a manner that permits 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 appro
17、val in the format YYYY. The month may be added if required for uniqueness. 2.2 The scope of the series identified by the letter shall be as follows: A Organization of the work of ITU-T B Not allocated C Not allocated D Tariff and accounting principles and international telecommunication/ICT economic
18、 and policy issues E Overall network operation, telephone service, service operation and human factors F Non-telephone telecommunication services G Transmission systems and media, digital systems and networks H Audiovisual and multimedia systems I Integrated services digital network J Cable networks
19、 and transmission of television, sound programme and other multimedia signals K Protection against interference L Environment and ICTs, climate change, e-waste, energy efficiency; construction, installation and protection of cables and other elements of outside plant M Telecommunication management,
20、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 Switching and signalling, and associated measurements and t
21、ests R Telegraph transmission S Telegraph services terminal equipment T Terminals for telematic services U Telegraph switching 2 Rec. ITU-T A.12 (11/2016) 2 V Data communication over the telephone network W Not allocated X Data networks, open system communications and security Y Global information i
22、nfrastructure, Internet protocol aspects, next-generation networks, Internet of Things and smart cities 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 Recommendatio
23、n should be concise (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
24、) responsible for its approval and a record of revisions shall be clearly indicated, together with the approval process applied. In accordance with the ITU Convention, the status of Recommendations approved is the same for both the alternative approval process (AAP) and traditional approval process
25、(TAP) methods of approval. 2.6 The author of a new or revised Recommendation shall provide, in front of the main body of the Recommendation, a summary and a set of keywords as outlined in the “Authors Guide for drafting ITU-T Recommendations“. The author may also provide other up-front elements, suc
26、h as background information, 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 Geneva, 2017 SERIES OF ITU-T RECOMME
27、NDATIONS Series A Organization of the work of ITU-T Series D Tariff and accounting principles and international telecommunication/ICT economic and policy issues Series E Overall network operation, telephone service, service operation and human factors Series F Non-telephone telecommunication service
28、s Series G Transmission systems and media, 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 interferen
29、ce Series L Environment and ICTs, climate change, e-waste, energy efficiency; construction, installation and protection of cables and other elements of outside plant Series M Telecommunication management, including telecommunication network management and network maintenance Series N Maintenance: in
30、ternational sound programme and television transmission circuits Series O Specifications of measuring equipment Series P Telephone transmission quality, telephone installations, local line networks Series Q Switching and signalling, and associated measurements and tests Series R Telegraph transmissi
31、on 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, next-generation networks, Internet of Things and smart cities Series Z Languages and general software aspects for telecommunication systems
