1、 INTERNATIONAL TELECOMMUNICATION UNION A.13TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (10/2000) SERIES A: ORGANIZATION OF THE WORK OF ITU-T Supplements to ITU-T Recommendations ITU-T Recommendation A.13 (Formerly CCITT Recommendation) ITU-T A.13 (10/2000) i ITU-T Recommendation A.13 Supplements
2、 to ITU-T Recommendations Summary This Recommendation describes Supplements to ITU-T Recommendations. Source ITU-T Recommendation A.13 was prepared by TSAG (1997-2000) and approved by WTSA (27 September 6 October 2000). ii ITU-T A.13 (10/2000) FOREWORD The International Telecommunication Union (ITU)
3、 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 technical, operating and tariff questions and issuing Recommendations on them with a view to standardi
4、zing 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, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covere
5、d 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. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicat
6、e both a telecommunication administration and a recognized operating agency. Ge3 ITU 2001 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 ITU
7、. ITU-T A.13 (10/2000) iii CONTENTS Page 1 Introduction. 1 2 Supplements 1 ITU-T A.13 (10/2000) 1 ITU-T Recommendation A.13 Supplements to ITU-T Recommendations (Montreal, 2000) 1 Introduction In the course of its studies, each study group deals with contributions and reports, which are distributed
8、to those organizations that have registered for participation in the study groups work and Recommendations resulting from those studies reach a much wider audience. Normally, any information that is considered as merely illustrative or supplementary to a Recommendation should be included as a (non-i
9、ntegral) Appendix to that Recommendation, where it is useful to the wider audience. However, there are exceptional instances where separate publication of such information is warranted, in the form of Supplements to the Recommendations. 2 Supplements The following general principles shall be applied
10、 by study groups for the development, approval, identification and revision of Supplements: 2.1 Before proposing any new or revised text as a Supplement, a study group or TSAG should ensure, in consultation with the Director, that: i) the subject matter is within its mandate; ii) there is a sufficie
11、nt need for the information on a long-term basis; iii) the text cannot be reasonably adapted for inclusion in an existing or new Recommendation (e.g. as an appendix); iv) the text is sufficiently mature and that the text follows, as far as possible, the format of the “Authors Guide for drafting ITU-
12、T Recommendations“; v) the text contains material which is supplementary to and associated with the subject matter of one or more Recommendations but is not essential to their completeness or understanding and implementation. 2.2 Supplements do not require approval according to Resolution 1 or Recom
13、mendation A.8 procedures; agreement by the study group or by TSAG (in case of a Supplement developed by TSAG) is sufficient. 2.3 Supplements should be limited in number and volume. 2.4 Supplements are only informative and are therefore not considered to be an integral part of any Recommendation(s).
14、They do not imply any agreement on the part of ITU-T. 2.5 Each Supplement should be unambiguously identified by the series letter to which it is associated followed by a sequential number unique within that series. 2.6 Since Supplements are essentially reference material, no onus is implied on the i
15、ssuing study group to update or to reissue Supplements. However, should reference to a Supplement be made in a Recommendation, the study group should review the applicability both of that reference and the Supplement at least once every four years, and take any necessary action. 2 ITU-T A.13 (10/200
16、0) 2.7 Supplements should be included in databases along with ITU-T Recommendations, but may be deleted after consultation with the concerned study group if not reviewed or updated after a period of eight years. 2.8 To the extent practicable, Supplements will be published in a similar fashion to Rec
17、ommendations, but with a lower priority, and taking into account market needs. Geneva, 2001 SERIES OF ITU-T RECOMMENDATIONS Series A Organization of the work of ITU-T Series B Means of expression: definitions, symbols, classification Series C General telecommunication statistics Series D General tar
18、iff principles Series E Overall network operation, telephone service, service operation and human factors Series F Non-telephone telecommunication services Series G Transmission systems and media, digital systems and networks Series H Audiovisual and multimedia systems Series I Integrated services d
19、igital network Series J Transmission of television, sound programme and other multimedia signals Series K Protection against interference Series L Construction, installation and protection of cables and other elements of outside plant Series M TMN and network maintenance: international transmission
20、systems, telephone circuits, telegraphy, facsimile and leased circuits Series N Maintenance: international sound programme and television transmission circuits Series O Specifications of measuring equipment Series P Telephone transmission quality, telephone installations, local line networks Series
21、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 and open system communications Series Y Global information infrastructure and Internet protocol aspects Series Z Languages and general software aspects for telecommunication systems
