ITU-T HDBK HQS-1993 Handbook on Quality of Service and Network Performance《服务和网络运行质量手册》.pdf
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1、SII*ITU-T HDBK HQS-ENGL 1993 H 4862571 0682350 933 INTERNATIONAL TELECOMMUNICATION UNION - CCITT THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMMITTEE HANDBOOK ON QUALITY OF SERVICE AND NETWORK PERFORMANCE Geneva, 1993 INTERNATIONAL TELECOMMUNICATION UN ION CCITT THE INTERNATIONAL TELEGRA
2、PH AND TELEPHONE CONSULTATIVE COMMITTEE HANDBOOK ON QUALITY OF SERVICE AND NETWORK PERFORMANCE Geneva, 1993 ISBN 92-61 -04741 -6 STDaITU-T HDBK HQS-ENGL 11773 48625L Ob82152 706 H O ITU 1993 Ail rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, e
3、lectronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. Si“i7MU-T HDBK HQS-ENGL 3993 4862593 b82153 b42 D CONTENTS Page Preface V . CHAPTER 1 - Introduction to quality of service and network performance 1 1.1 Overview of Quaiity of Servi ce . 1 1.2
4、Network performance aspects . 3 1.3 Description of QOS by NP parameters 4 1.4 Practical application of QOS and Np measures . 4 CHAPTER 2 - Source of information and data collection . 7 2.1 General aspects . 7 2.2 Source of information and data collection . 7 2.3 Evaluation procedures . 9 CHAPTER 3 -
5、 Recommendations and objectives on quality of service and network performance . 13 3.1 Quality of Service and network performance Recommendations . 13 3.2 Objectives . 13 CHAPTER 4 - Dependability planning . 15 4.1 Introduction 15 4.2 Dependability planning concepts and models 15 Annex A - Practical
6、 use of terms and definitions . Annex B - QOS and network performance parameters Annex C - Standard methods for data treatment Annex D - QOS Recommendation references Annex E - E-series Recommendations which include numerical objectives . Annex F - Mapping of QOS/“ measures and objectives Annex G -
7、Dependability planning Annex H - Useful addresses of standards organisations 16 22 37 45 49 53 57 72 Contents III - - STD-ITU-T HDBK HQS-ENGL 1993 4862593 Ob82154 589 9 PREFACE The CCiT Handbook on Quality of Service, Network Management and Network Maintenance was published in 1984. It describes the
8、 principles, rules and recommendations to be considered in organising and operating the telephone network and its telecommunications services with respect to Quality of Service, Network Management and Network Maintenance. Furthermore, the Handbook has proven to be a useful educational guide on these
9、 topics, between which there are very strong interrelationships. During the 1985-1988 period work continued to review and develop guidance in each of the areas covered by the Handbook. During this period there was considerable development on Quality of Service and Network Performance issues and cons
10、ideration was given to publishing an entirely new Handbook on these subjects. The resulting publication essentially replaces the Quality of Service sections of the 1984 Handbook but retains references to it where these are considered useful. The new Handbook contains a distillation of the ideas form
11、ulated during the 1984-1991 period but focuses, in the main, on the work which resulted in Recommendations carried in the 1989 Blue Book. However reference has been made, where necessary, to later work, especially those recent Recommendations which are currently being authorised under the new accele
12、rated procedure process. Other work, which has been included, but is not supported by Recommendations, is annotated to distinguish it from the majority of the material contained in the new Handbook. The new Handbook concentrates mainly on the Public Switched Telephone Network (PSTN). However the pri
13、ncipies and parameters of Quality of Service and Network Performance explained in the new Handbook may be applied to all services. The new Handbook can be applied to both national and international networks since in Quality of Service terms there is no difference. In addition the new Handbook contai
14、ns references to ISDN, although, as relevant Recommendations in this area are few in number at the time of writing, there is little scope for useful comment. It is hoped, however, to develop Addenda covering ISDN Quality of Service and Network Performance issues as these evolve. The new Handbook is
15、divided into two main parts, which, while being complete in themselves, are frequently cross-referenced. The fmt part consists of four Cbapters which can be considered as an overview of the subject for the general reader. The second part is made up of eight Annexes for those readers requiring more s
16、pecific information and for reference purposes. The new Handbook is aimed at all levels of management in telecommunication Administrations as well as other interested parties. Note - In this document, the expression “Administration” is used to denote both a telecommunication Administration and a rec
17、ognised private operating agency. Previous page is blank. Preface V STD-ITU-T HDBK HQS-ENGL 1773 4862571 Ob82155 415 m CHAPTER 1 INTRODUCTION TO QUALITY OF SERVICE AND NETWORK PERFORMANCE Abstract This chapter introduces briefly the concept of Quality of Service in a unified context with its related
18、 concepts and measures. The purpose is to apply Quality of Service activities in practice, utilizing CCIT Recommendations and Administrations own experiences. Reference is made to the Annexes in this Handbook. 1.1 Overview of Quality of Service Quality of Service (QOS) is a very broad concept which
19、comprises many performance aspects and numerous e collective effect of service performances which determine the degree of satisfaction of a user of the measures. According to Recommendation E.800 Quality of Service is: service. The purpose of Figure 1 (see Figure 1E.800) is to provide an overview of
20、 the factors which contribute collectively to the overall Quality of Service as perceived by the user of a telecommunication service. As seen from Figure 1 there are four main factors which contribute to the overall Quality of Service. Each of these Service Performance aspects should be considered a
21、s a concept, an “umbrella” normally characterised by many measures or parameters. QOS depends on: - - - - At the next “level” Serveability depends on the properties of: - the Trafficability - - QOS can be structured in other ways than Figure 1. For example it may be represented just by numerous Howe
22、ver, - to give an overview, - to avoid confusion, - the Support, i.e. the secondary services such as information, provisioning, billing, etc. the Operability, i.e. the ease of use, etc. the Serveability, i.e. the access and retention of the service, etc. the Integrity, i.e. the transmission aspects,
23、 etc. the Propagation, i.e. radio transmission, etc. the Dependability aspects, i.e. availability, reliability, etc. measures and parameters which give a profile of QOS. to apply a consistent set of terms widely used within CCIT, this handbook is exclusively based on the structure according to Recom
24、mendation E.800 with its Supplement No. 6. Thus Figure 1 should be considered as the framework for the QOS concept. QOS characteristics should be applied - among other purposes - as tools for mapping a specific service seen from the customers viewpoint. Mapping (ref. Chapter 3 and Annex F) is intend
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