1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationCommunication network dependability engineeringBS EN 61907:2010National forewordThis British Standard is the UK implementation of EN 61907:2010. It is identical to IEC 61907:2009
2、.The UK participation in its preparation was entrusted to Technical CommitteeDS/1, Dependability and terotechnology.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions of acontract.
3、 Users are responsible for its correct application. BSI 2010ISBN 978 0 580 59963 7ICS 21.020; 33.040.40Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of the StandardsPolicy and Strategy Committee on 31 July 2010
4、.Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 61907:2010EUROPEAN STANDARD EN 61907 NORME EUROPENNE EUROPISCHE NORM February 2010 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee
5、fr Elektrotechnische Normung Central Secretariat: Avenue Marnix 17, B - 1000 Brussels 2010 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61907:2010 E ICS 21.020; 33.040.40 English version Communication network dependability engi
6、neering (IEC 61907:2009) Ingnierie de la sret de fonctionnement des rseaux de communication (CEI 61907:2009) Zuverlssigkeit von Kommunikationsnetzen (IEC 61907:2009) This European Standard was approved by CENELEC on 2010-02-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regula
7、tions which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This
8、 European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members
9、 are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia,
10、Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 61907:2010EN 61907:2010 - 2 - Foreword The text of document 56/1339/FDIS, future edition 1 of IEC 61907, prepared by IEC TC 56, Dependability, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61907 on
11、2010-02-01. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent rights. The following dates were fixed: latest date by which the EN has to be impleme
12、nted at national level by publication of an identical national standard or by endorsement (dop) 2010-11-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2013-02-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International
13、Standard IEC 61907:2009 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated: 1 IEC 60300-1 NOTE Harmonized as EN 60300-1. 2 IEC 60300-2 NOTE Harmonized as EN 60300-2. 3 IE
14、C 60300-3-1 NOTE Harmonized as EN 60300-3-1. 4 IEC 60300-3-3 NOTE Harmonized as EN 60300-3-3. 5 IEC 60300-3-11 NOTE Harmonized as EN 60300-3-11. 6 IEC 60300-3-12 NOTE Harmonized as EN 60300-3-12. 7 IEC 60812 NOTE Harmonized as EN 60812. 8 IEC 61025 NOTE Harmonized as EN 61025. 9 IEC 61078 NOTE Harmo
15、nized as EN 61078. 10 IEC 61165 NOTE Harmonized as EN 61165. _ BS EN 61907:2010- 3 - EN 61907:2010 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following referenced documents are indispensable for the application of this d
16、ocument. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. P
17、ublication Year Title EN/HD Year IEC 60050-191 - International Electrotechnical Vocabulary (IEV) - Chapter 191: Dependability and quality of service - - IEC 60300-3-15 - Dependability management - Part 3-15: Application guide - Engineering of system dependability EN 60300-3-15 - BS EN 61907:2010 2 6
18、1907 IEC:2009 CONTENTS INTRODUCTION.6 1 Scope.7 2 Normative references .7 3 Terms, definitions and abbreviations 7 3.1 Terms and definitions 7 3.2 Abbreviations 10 4 Overview of communication network dependability .10 4.1 Network dependability framework 10 4.2 Network life cycle and evolution proces
19、s .11 5 Network dependability implementation12 5.1 Dependability engineering applications12 5.2 Network technology consideration .21 5.3 Network service functions consideration22 5.4 Network performance consideration.23 5.5 Integrity of network data and information.26 5.6 Quality of service (QoS) 27
20、 6 Network dependability assessment and measurement 30 6.1 Network dependability analysis .30 6.2 Network dependability fault insertion test 31 6.3 Measurement of network dependability attributes 32 6.4 Network dependability assessment methods .32 7 Quality of service measurement34 7.1 QoS measureme
21、nt overview34 7.2 Generic user-oriented QoS parameters and requirements .35 Annex A (informative) Generic communication network model and related concepts 37 Annex B (informative) Network life cycle and evolution process .46 Annex C (informative) Criteria for establishing network security services .
22、56 Bibliography60 Figure A.1 A generic communication network model 37 Figure A.2 A process model on interactions of areas of influence.38 Figure A.3 OSI reference model.39 Figure A.4 QoS, dependability and network performance relationships 41 Figure B.1 Network evolution process incorporated in the
23、network life cycle stages .46 Table 1 A matrix for capturing users QoS data 36 Table A.1 Examples of dependability influencing factors affecting network technology 42 Table A.2 Examples of dependability influencing factors affecting network service functions.43 Table A.3 Examples of dependability in
24、fluencing factors affecting delivery of network performance .44 Table A.4 Examples of dependability influencing factors affecting integrity of network data and information and provision of QoS 45 BS EN 61907:201061907 IEC:2009 3 Table C.1 Four basic types of vulnerability causes.57 BS EN 61907:2010
25、6 61907 IEC:2009 INTRODUCTION Communication networks are today growing in complexity to meet diverse market demands and public communication needs; networks such as mobile phones, e-commerce, intranet and Internet services. At the same time, communication technologies are developing rapidly to provi
26、de efficient network services and dependable performance needed in worldwide communications. The essential communication services such as information exchange, data processing and network connections enable public and private communications work to be carried out cost-effectively. Business and priva
27、te sectors greatly depend on these communication services that have become pivotal in their daily routines. A key factor in ensuring network performance and network service functions is dependability. Network dependability is the ability of a network to perform as and when required and to meet users
28、 communication needs for continuous network performance and service operation. From a users perspective, dependability infers that the provision of network service functions is trustworthy and capable of performing the desirable service upon demand. Network dependability is characterized by its perf
29、ormance attributes including availability of network performance and quality of service. The network concept is an extension of the systems concept, addressing a common framework for the interaction of network elements and interoperability of service functions that together achieve specific communic
30、ation objectives. The network requires specific performance characteristics in order to deliver both its service functions and communication services. Network dependability engineering is a specific risk-based technical discipline intended to deal with the diverse applications and deployment of esse
31、ntial communication services. Unlike the system life cycle where system retirement exists, a network seldom reaches retirement. A network evolves with time to accommodate innovative feature applications and provision of continual communication service needs. The network life cycle is evolutionary an
32、d has to address technology convergence issues and renewal processes as well as characterize specific dependability attributes to meet network performance objectives. The need for network dependability standardization is essential to achieve cost-effective development and implementation of communica
33、tion networks. Communication network dependability provides important performance attributes for network equipment developers and suppliers, network integrators and providers of network service functions who are mainly concerned with global competitive environments. The primary reason is that depend
34、ability can seriously impact revenue generation and affect return-on-investments. Users of network service functions and communication services rely heavily on network functions and reliable services that guarantee network security and uninterrupted network connections for voice, video and data tran
35、smission. This International Standard provides a generic framework for communication network dependability. The communication network includes telecommunications networks, Internet and intra-networks utilizing information technology. This standard describes the influence of dependability attributes
36、and their impact on network performance. It provides the criteria and methodology for network technology designs, security service functions, dependability assessment and quality of service evaluation. This is to guide engineering and implementation processes for realization of network dependability
37、 performance objectives. This standard constitutes part of a framework of standards on system aspects of dependability by extending the system dependability concepts of IEC 60300-3-15 for network applications, and to support IEC 60300-1 and IEC 60300-2 on dependability management. The network perfor
38、mance and communication services in this standard are referenced in the International Telecommunication Union Telecommunication standardization sector (ITU-T) series of recommendations. BS EN 61907:201061907 IEC:2009 7 COMMUNICATION NETWORK DEPENDABILITY ENGINEERING 1 Scope This International Standa
39、rd gives guidance on dependability engineering of communication networks. It establishes a generic framework for network dependability performance, provides a process for network dependability implementation, and presents criteria and methodology for network technology designs, performance evaluatio
40、n, security consideration and quality of service measurement to achieve network dependability performance objectives. This standard is applicable to network equipment developers and suppliers, network integrators and providers of network service functions for planning, evaluation and implementation
41、of network dependability. 2 Normative references The following referenced documents are indispensable for the application of this standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
42、IEC 60050-191, International Electrotechnical Vocabulary Chapter 191: Dependability and quality of service IEC 60300-3-15, Dependability management Part 3-15: Application guide Engineering of system dependability 3 Terms, definitions and abbreviations 3.1 Terms and definitions For the purposes of th
43、is document, the terms and definitions given in IEC 60050-191 and the following apply. 3.1.1 communication network system of communication nodes and links that provides transmission of analog or digital signals EXAMPLES Telecommunications networks, Internet, intranet, extranet, Wide Area Networks (W
44、AN), Local Area Networks (LAN) and computer networking utilizing information technology. NOTE 1 A network has its boundary. All nodes at the network boundary are called ends. In some applications, the term “node” is used instead of “end” as a communication access point to the network, as well as for
45、 interconnections between the transmission links. NOTE 2 A “backbone” communication network consists of core network and high-speed transmission lines (national or international), connecting between major switching network nodes (interconnection of transmission lines) at various locations in a count
46、ry or region. 3.1.2 (network) dependability ability to perform as and when required to meet specified communication and operational requirements BS EN 61907:2010 8 61907 IEC:2009 3.1.3 (network) availability ability to be in a state to perform as and when required, under given conditions, assuming t
47、hat the necessary external resources are provided NOTE 1 Availability depends on the combined characteristics of the reliability, maintainability, and recoverability of the item, and generally, on the maintenance support performance. NOTE 2 Given conditions would include aspects that affect reliabil
48、ity, maintainability and maintenance support performance. 3.1.4 (network) reliability ability to perform as required for a given time interval, under given conditions NOTE 1 Given conditions would include aspects that affect reliability, such as: mode of operation, stress levels, environmental condi
49、tions. NOTE 2 Reliability may be quantified using appropriate measures such as meantime to failure, or the probability of no failure within a specified period of time. 3.1.5 (network) maintainability ability to be retained in, or restored to, a state in which it can perform as required under given conditions of use and maintenance NOTE 1 ”Given conditions of use” may include storage. NOTE 2 ”Given conditions of maintenance” include the procedures and r
