1、 IEC 60728-12 Edition 2.0 2017-06 INTERNATIONAL STANDARD Cable networks for television signals, sound signals and interactive services Part 12: Electromagnetic compatibility of systems IEC 60728-12:2017-06(en) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2017 IEC, Geneva, Switzerland All rights
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11、 Part 12: Electromagnetic compatibility of systems INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 33.060.40; 33.100.01 ISBN 978-2-8322-4364-0 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from an authorized distributor. 2 I
12、EC 60728-12:2017 IEC 2017 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope 7 2 Normative references 7 3 Terms, definitions, symbols and abbreviated terms 8 3.1 Terms and definitions 8 3.2 Abbreviated terms . 10 4 Methods of measurement 11 4.1 Basic principles . 11 4.2 Radiation from cable networks 11
13、4.2.1 General . 11 4.2.2 Field strength method 11 4.2.3 Subcarrier measurement procedure . 13 4.2.4 GPS based leakage detection system 13 4.3 Immunity of cable networks . 14 4.3.1 General . 14 4.3.2 Measurement procedure for interference caused by high-power local outdoor transmitter 14 5 Performanc
14、e requirements. 14 5.1 General conditions 14 5.2 Radiation from cable networks and other sources . 15 5.2.1 General . 15 5.2.2 Measurement of the total radiation . 15 5.2.3 Measurement of narrowband radiation . 15 5.3 Immunity of cable networks . 16 Annex A (informative) Information on legal require
15、ments in some countries . 17 A.1 Legislation in Germany . 17 A.2 Requirements in Germany . 17 A.3 Reference for legislation in Germany 19 Annex B (informative) Frequency ranges of typical safety of life services . 20 Annex C (informative) Interdependence between the maximum allowable field strength
16、and the minimum signal level at system outlet . 21 Annex D (normative) Measurements at other distances than the standard distance of 3 m 23 D.1 Measurement at a reduced distance below 3 m . 23 D.2 Measurement at measurement distances above 3 m . 23 Annex E (informative) GPS based leakage detection s
17、ystem for cable networks 24 E.1 General . 24 E.2 Automated data collection by driving through the HFC network . 24 E.3 Tagging of the signal 24 E.4 Post-processing the collected data and visualization of leakages 24 E.5 On-site location of the leak . 24 Bibliography 25 Table 1 Limits of total radiat
18、ion 15 Table 2 Narrowband radiation limits . 15 IEC 60728-12:2017 IEC 2017 3 Table 3 Maximum expected field strength 16 Table 4 Required carrier-to-interference ratio . 16 Table A.1 Protection of particular frequency ranges according to 3 of the Order . 18 Table A.2 Field strength limit values at a
19、3 m distance from line-bound telecommunications facilities and networks . 19 Table B.1 Frequency ranges of typical safety of life services . 20 4 IEC 60728-12:2017 IEC 2017 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ CABLE NETWORKS FOR TELEVISION SIGNALS, SOUND SIGNALS AND INTERACTIVE SERVICES Part
20、12: Electromagnetic compatibility of systems FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on al
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29、l fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publ
30、ication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 60728-12 has been prepared by technical area 5: Cable n
31、etworks for television signals, sound signals and interactive services, of IEC technical committee 100: Audio, video and multimedia systems and equipment. This second edition cancels and replaces the first edition published in 2001. This edition constitutes a technical revision. This edition include
32、s the following significant technical changes with respect to the previous edition: a) IEC 60728-12 with its methods of measurement and EMC performance requirements is explicitly dedicated to “under operating conditions (in situ)” to ensure the ongoing EMC integrity of cable networks. b) The first i
33、ntermediate frequency range (1st IF range) for satellite signal transmission was extended to cover now frequencies from 950 MHz up to 3 500 MHz. IEC 60728-12:2017 IEC 2017 5 c) The method of measurement and the requirements for in-band immunity were extended taking into account the new EMC environme
34、nt due to the allocation of broadband wireless services in the frequency band 694 MHz to 862 MHz. As a consequence, the limits of in- band immunity were specified for analogue and additionally for digital signals in this frequency range. d) The substitution method of measurement (power method) was d
35、eleted. e) EMC measurements below 30 MHz were deleted. f) New Annex D “Measurements at other distances than the standard distance of 3 m”. g) New Annex E “GPS based leakage detection system for cable networks”. The text of this International Standard is based on the following documents: FDIS Report
36、on voting 100/2895/FDIS 100/2926/RVD Full information on the voting for the approval of this International Standard can be found in the report on voting indicated in the above table. This document has been drafted in accordance with the ISO/IEC Directives, Part 2. The readers attention is drawn to t
37、he fact that Annex A lists all of the “in-some-country” clauses on differing practices of a less permanent nature relating to the subject of this standard. A list of all parts in the IEC 60728 series, published under the general title Cable networks for television signals, sound signals and interact
38、ive services, can be found on the IEC website. The committee has decided that the contents of this document will remain unchanged until the stability date indicated on the IEC website under “http:/webstore.iec.ch“ in the data related to the specific document. At this date, the document will be recon
39、firmed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. 6 IEC 60728-12:2017 IEC 2017 INTRODUCTION Standards and deliverables of the IEC 60728 series deal with cable networks including equipment and associated methods of mea
40、surement for headend reception, processing and distribution of television and sound signals, and for processing, interfacing and transmitting all kinds of data signals for interactive services using all applicable transmission media. These signals are typically transmitted in networks by frequency-m
41、ultiplexing techniques. This includes, for instance: regional and local broadband cable networks, extended satellite and terrestrial television distribution systems, individual satellite and terrestrial television receiving systems, and all kinds of equipment, systems and installations used in such
42、cable networks, distribution and receiving systems. The extent of this standardization work is from the antennas and/or special interfaces to the headend or other interface points to the network up to any terminal interface of the equipment on the customers premises. The standardization work will co
43、nsider coexistence with users of the RF spectrum in wired and wireless transmission systems. The standardization of any user terminals (i.e. tuners, receivers, decoders, multimedia terminals, etc.) as well as of any coaxial, balanced and optical cables and accessories thereof is excluded. IEC 60728-
44、12:2017 IEC 2017 7 CABLE NETWORKS FOR TELEVISION SIGNALS, SOUND SIGNALS AND INTERACTIVE SERVICES Part 12: Electromagnetic compatibility of systems 1 Scope This part of IEC 60728 applies to the radiation characteristics and immunity to electromagnetic disturbance of cable networks for television sign
45、als, sound signals and interactive services and covers the frequency range 0,15 MHz to 3,5 GHz. NOTE 1 Measurements below 30 MHz are not generally considered useful in the context of cable networks and are difficult to perform in practice. This document specifies methods of measurement and EMC perfo
46、rmance requirements under operating conditions (in situ) to ensure the ongoing EMC integrity of cable networks. Cable networks beyond the system outlets (e.g. the receiver lead, in simplest terms) that begin at the system outlet and end at the input to the subscribers terminal equipment are not cove
47、red by this document. Requirements for the electromagnetic compatibility of receiver leads are specified in IEC 60966-2-4, IEC 60966-2-5 and IEC 60966-2-6. Cable networks and a wide range of radio services have to coexist. These include, for example, the emergency services, safety of life, broadcast
48、ing, aeronautical, radio navigation services and also land, mobile, amateur and cellular radio services. Frequency ranges of typical safety of life services are listed in Annex B. Additional protection for certain services may be required by national regulations. Annex A gives information on legal r
49、equirements in certain countries. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60050-161:1990, International Electrotechnical Vocabulary Chapter 161: Electromagnetic compatibility (available at: www.electropedi
