1、 sD.1Tll-T RECMN K-42-ENGL 1998 m Y862591 Ob49750 067 INTERNATIONAL TELECOMMUNICATION UNION ITU=T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU K.42 (05/98) SERIES K: PROTECTION AGAINST INTERFERENCE Preparation of emission and immunity requirements for telecommunication equipment - General princip
2、les ITU-T Recommendation K.42 (Previously CCITT Recommendation) STDmITU-T RECMN K.42-ENGL L998 48b2591 Ob49753 TT3 9 ITU-T K-SERIES RECOMMENDATIONS PROTECTION AGAINST INTERFERENCE For further details, please refer to ITU-T List of Recommendations. ITU-T RECOMMENDATION K.42 PREPARATION OF EMISSION AN
3、D IMMUNITY REQUIREMENTS GENERAL PRINCIPLES FOR TELECOMMUNICATION EQUIPMENT - Summary This Recommendation explains the basic principles on which EMC standardization is based in ITU-T taking into account EMC standards published by IEC and CISPR. It describes procedures which are followed in the prepar
4、ation of ITU-T Recommendations on Electromagnetic Compatibility (EMC) requirements which apply to telecommunications equipment. Recommendations concerning resistibility requirements for equipment as well as EMC characteristics of telecommunications networks, mitigation methods, bonding and earthing,
5、 etc. are outside the scope of this Recommendation. Source ITU-T Recommendation K.42 was prepared by ITU-T Study Group 5 (1997-2000) and was approved under the WTSC Resolution No. 1 procedure on the 15th of May 1998. Recommendation K.42 (0998) 1 FOREWORD ITLJ (IntemationaI Telecommunication Union) i
6、s the United Nations Specialized Agency in the field of telecommuni- cations. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the ITU. The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to s
7、tandardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, establishes the topics for study by the IT-T Study Groups which, in their turn, produce Recommendations on these topics. The approval of Recommendations
8、by the Members of the ITU-T is covered by the procedure laid down in WTSC Resolution No. 1. In some areas of information technology which fall within ITU-Ts purview,the necessary standards are prepared on a collaborative basis with IS0 and IEC. NOTE In this Recommendation, the expression “Administra
9、tion“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS The ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Proper
10、ty Right. The 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, the ITU had not received not
11、ice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest infomation and are therefore strongly urged to consult the TSB patent database. O ITU 1998 All rights reserved. No pa
12、rt 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 the ITU. 11 Recommendation K.42 (05/98) CONTENTS 1 Scope 2 Definitions 3 References 4 EMC standardization 4.1 General p
13、rinciples . 4.2 Types of EMC Standardsecommendations 5 6 Principles on environmental classification . Developing product family/product EMC Recommendations 6.1 General 6.2 Emission Guidance for setting performance criteria in product fmily/product Recommendations 6.3 Immunity . 6.4 Page 1 1 1 2 2 3
14、4 5 5 5 5 5 . Recommendation K.42 (05198) 111 Recommendation K.42 PREPARATION OF EMISSION AND IMMUNITY REQUIREMENTS FOR TELECOMMUNICATION EQUIPMENT - GENERAL PRINCIPLES (Geneva, 1998) 1 Scope This Recommendation applies to EMC requirements for telecommunications equipment as they are recommended to
15、be drafted in ITU-T Study Group 5 in particular and in other Study Groups as appropriate. The principles and procedures described should be followed in order to ensure that the resulting Recommendations are consistent with each other, with current practice and with IEC publications concerning EMC. T
16、he aim is to avoid duplication of work and overlapping document scopes, taking carefully into account EMC activities in IEC. Recommendations on resistibility requirements for telecommunications equipment are for the moment outside the scope of this Recommendation but may be added to updated editions
17、. EMC Recommendations concerning other parts of the telecommunications network than equipment, e.g. mitigation methods in the network, earthing and bonding, are outside the scope of this Recommendation. 2 Definitions Definitions relating to EMC are given in IEC 50 (161): International Electrotechnic
18、al Vocabulary, Chapter 161, Electromagnetic Compatibility i. In addition to electromagnetic compatibility: EMC itself, essential terms are electromagnetic environment, electromagnetic disturbance, electromagnetic interference, emission and immunity. Especially it should be noted that “disturbance“ a
19、nd “interference“, often used indiscriminately, in the context of EMC are used to mean “cause“ and “effect“ respectively. 2.1 frequencies. high frequency: Should be used to refer to frequencies above 9 kHz. Consequently it embraces all radio 2.2 low frequency: Should be used to refer to frequencies
20、below 9 kHz. 2.3 port: Is a particular interface of the equipment which couples this equipment with or is influenced by the external electromagnetic environment. The enclosure port is the physical boundary of the equipment which provides for radiated and electrostatic discharge energy transfer, wher
21、eas the AC power port, the DC power port and the signaikontrol port provide for conducted energy transfer. 3 References il IEC 60050-1 61 (1990), International Electrotechnical Vocabulary - Chapter 161: Electromagnetic Compa- t ib ility . 21 ITU-T Recommendation A.23 (1 996), Collaboration with the
22、International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC) on Information technology. 31 IEC, Guide 107 (1998), Electromagnetic compatibility - Guide to the drafting of electromagnetic compatibility publications. 41 IEC 6 1000, Electromagnetic compat
23、ibility (EMC) - Part 4: Testing and measurement techniques. IEC 61000-4-1:1992, Overview of immunity tests. IEC 6 100-4-2: 1995, Electrostatic discharge immuniv test. Recommendation K.42 (0998) 1 STD-ITU-T RECMN K-42-ENGL L998 48b259L 0b4975b 585 IEC 61000-4-3:1995, Radiated, radio-fiequency, electr
24、omagneticfield immunity test. IEC 61000-4-4: 1995, Electrical fast transienthurst immunity test. IEC 61000-4-5:1995, Surge immunity test. IEC 61000-4-6: 1996, Immunity to conducted disturbances, induced by radio-fiequencyfields. IEC 6 1000-4-7: 1991, General guide on harmonics and interharmonics mea
25、surements and instrumentation, for power supply systems and equipment connected thereto. IEC 61000-4-8:1993, Powerfiequency magneticJield immunity test. IEC 61000-4-9:1993, Pulse magneticfield immunity test. IEC 6 1000-4- 1 O: 1993, Damped oscillatory magnetic3eld immunity test. IEC 61 000-4-1 1 : 1
26、994, Voltage dips, short interruptions and voltage variations immunity tests. IEC 61000-4-12:1995, Oscillatory waves immunity test. IEC 6 1000-4- 15: 1997, Flickermeter - Functional and design specifications. IEC 6 1000-4- 16: 1998, Test for immunity to conducted common mode disturbances in the fieq
27、uency range O Hz to 150 kHz. IEC 6 1000-4- 17, Ripple on DCpower supply. IEC 6 1000-4-20, TEM Cells. IEC 6 1000-4-23, Test methods for protective devices for HEMP radiated disturbances. IEC 6 1000-4-24: 1997, Test methods for protective devices for HEMP conducted disturbance. IEC 1000-4-28, Variatio
28、n of powerji-equency. i51 CISPR 24, Information Technology Equipment - Immunity characteristics - Limits and methods of measurement (FDiS,) . 161 171 IEC Publication 72 1 (Series), Classification of environmental conditions. CISPR 22, Information technology equipment - Radio disturbance characterist
29、ics - Limits and methods of measurement. 181 IEC 61000, Electromagnetic compatibility (EMC) -Part 3: Limits. IEC 61000-3-2: 1995, Limits for harmonic current emissions (equipment input current 5 16 A per phase). IEC 6 1000-3-3: 1994, Limitation of voltage fluctuations and flicker in low-voltage supp
30、ly systems for equipment with rated current 5 16 A. 4 EMC standardization 4.1 General principles ITU-T Recommendation A.23 2 recognizes the need of collaboration with the International Organization for Standardization (ISO) and the Intemational Electrotechnical Commission (IEC). This applies also to
31、 the standardization in the EMC field where close cooperation with IEC is essential in order to avoid conflicting measurement and test methods and duplication of work. In accordance with agreements reached in Study Group 5, this Recommendation is partly based on IEC Guide 107 3 prepared by the Advis
32、ory Committee on Electromagnetic Compatibility (ACEC) of IEC . Two technical committees with horizontal functions have responsibility for developing EMC standards in IEC. The International Special Committee on Radio Interference (CISPR) is responsible for emissions above 9 kHz and has prepared also
33、immunity requirements for certain product families. Technical Committee 77: Electromagnetic 2 Recommendation K.42 (05/98) STDmITU-T RECMN K-42-ENGL 1998 4862.591 0649757 411 Compatibility is responsible for emissions below 9 kHz and for developing the basic standards for immunity testing. Different
34、product committees in IEC preparing product or product family specific EMC standards are obliged to use the emission limits and to refer to the basic immunity standards in their specifications. In accordance with agreements reached in Study Group 5, IT-T should, as far as possible, follow the same g
35、eneral principles as IEC product committees in the EMC Recommendations. Applying the same emission limits ensures uniformity and maintains control of the electromagnetic environment and guarantees that acceptable compatibility levels and disturbance levels are respected. This is especially tnie for
36、environments over which the telecommunications operator has no control. Referring to common measurement methods gives economic advances when the same test procedures, equipment and arrangements can be used for testing all kind of electrical and electronic equipment. Recommended practice on the appli
37、cation of these principles is given later in more detail. It should be noted that in justified cases it is possible to deviate from IEC publications. One reason may be the high priority of service required from the public telecommunications network equipment providing service for a large number of d
38、emanding customers. 4.2 Types of EMC Standards/Recommendations EMC publications developed in IEC are placed broadly in four categories which also other standardization bodies including IT-T should follow. These four categories are basic EMC publications, generic EMC standards, product family EMC sta
39、ndards and product EMC standards. IT-T, publishing mainly Recommendations comparable either to standards or to technical reports of IEC, is recommended to apply the categories as described in the following subclauses. 4.2.1 Basic EMC publications Basic EMC publications give the general and fundament
40、al conditions or rules for the achievement of EMC and serve as reference documents for generic, product family and product standards. They are general and hence are not dedicated to specific product families or products. In IEC, basic publications may be standards or technical reports. Basic EMC pub
41、lications may concern in particular: - terminology; - descriptions of electromagnetic phenomena; - descriptions and classification of the electromagnetic environment; - test and measurement techniques. To avoid duplication of work and conflicting standards, ITU-T should as much as possible make use
42、of basic EMC publications prepared by IEC. Test and measurement techniques which are not product dependent should apply IEC 61000-4-Series 4 standards as far as possible. Some test methods, e.g. the longitudinal mains induction test, may not be general enough to be included in IEC standards. Such a
43、Recommendation should be treated as a basic EMC Recommendation of ITU-T. Also Recommendations on conditions which are under control of telecom operators or Administrations, e.g. environmental classification of telecommunications centres, should be prepared in ITU-T and treated as basic EMC Recommend
44、ations of ITU-T. ITU-T should inform IEC on work items intended to prepare basic EMC Recommendations and any needs to amend basic EMC publications of IEC from the telecommunications point of view. 4.2.2 Generic EMC Standards/Recommendations Generic EMC standards apply to products operating in a part
45、icular environment for which no dedicated product family/ product EMC standard exists. They speciS, a set of requirements, test procedures and generalized performance criteria applicable to such products operating in this environment. Recommendation K.42 (05/98) 3 Generic EMC standards do not includ
46、e detailed measurement and test methods but refer for that purpose to the basic EMC standards. They concern requirements and tests related to emission and immunity, possibly in separate documents. The number of tests is limited to essential ones. Generic EMC ITU-T Recommendations should be provided
47、for such cases where there is no product family EMC Recommendation. 4.2.3 Product family EMC StandarddRecornmendations A product family is a group of similar products for which the same standards can be applied. Product family EMC StandardsRecommendations define specific EMC requirements and test pr
48、ocedures dedicated to particular product families. They indicate the selected tests and operational conditions during testing, test severities (test levels) and precise performance criteria in immunity tests and limits for conducted and radiated disturbances in emission measurements. They should not
49、 contain detailed measurement and test methods and test Set-ups but should refer to the basic EMC standards where possible. For terminal equipment, application of the product family standard prepared in IEC CISPR is recommended 5. For all other telecommunications equipment, ITU-T should consider preparing product family EMC Recommendations. 4.2.4 Product EMC StandarddRecommendations Product EMC StandardsRecommendations relate to a particular type of product for which specific conditions should be considered. The same rules
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