1、 IEC 60728-4 Edition 3.0 2007-08 INTERNATIONAL STANDARD NORME INTERNATIONALE Cable networks for television signals, sound signals and interactive services Part 4: Passive wideband equipment for coaxial cable networks Rseaux de distribution par cbles pour signaux de tlvision, signaux de radiodiffusio
2、n sonore et services interactifs Partie 4: Equipement large bande passif pour les rseaux de distribution par cbles coaxiaux IEC 60728-4:2007 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2007 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication ma
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16、aires sur cette publication ou si vous avez des questions contactez-nous: csciec.ch. IEC 60728-4 Edition 3.0 2007-08 INTERNATIONAL STANDARD NORME INTERNATIONALE Cable networks for television signals, sound signals and interactive services Part 4: Passive wideband equipment for coaxial cable networks
17、 Rseaux de distribution par cbles pour signaux de tlvision, signaux de radiodiffusion sonore et services interactifs Partie 4: Equipement large bande passif pour les rseaux de distribution par cbles coaxiaux INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE V ICS 3
18、3.060.40; 33.170 PRICE CODE CODE PRIX ISBN 978-2-83220-453-5 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this publication from an authorized distributor. Attention! Veuillez v
19、ous assurer que vous avez obtenu cette publication via un distributeur agr. 2 60728-4 IEC:2007 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope . 7 2 Normative references . 7 3 Terms, definitions, symbols and abbreviations 8 3.1 Terms and definitions 8 3.2 Symbols 12 3.3 Abbreviations 13 4 Methods of
20、measurement . 13 4.1 Attenuation 13 4.1.1 Test equipment 13 4.1.2 Measurement procedure 13 4.1.3 Presentation of the results . 14 4.2 Isolation 14 4.2.1 Definition . 14 4.2.2 Test equipment 14 4.2.3 Measurement procedure 14 4.2.4 Presentation of the results . 15 4.3 Through-loss . 15 4.3.1 Definitio
21、n . 15 4.3.2 Test equipment 15 4.3.3 Measurement procedure 15 4.3.4 Presentation of the results . 15 4.4 Group delay variation 15 4.4.1 Definition . 15 4.4.2 Test equipment 15 4.4.3 Method of measurement 16 4.4.4 Presentation of the result . 16 4.5 Amplitude frequency response 16 4.6 Return loss 16
22、4.7 Hum modulation of carrier . 16 4.7.1 Definition . 16 4.7.2 Description of the method of measurement 17 4.7.3 Measuring procedure . 18 4.7.4 Calculating the hum-modulation ratio . 19 4.7.5 Presentation of the results . 20 4.8 Two-carrier intermodulation measurements for second- and third-order pr
23、oducts 20 5 Performance requirements and recommendations 21 5.1 General performance requirements and recommendations 21 5.1.1 Safety 21 5.1.2 Electromagnetic compatibility (EMC) . 21 5.1.3 Environmental . 21 5.1.4 Marking . 22 60728-4 IEC:2007 3 5.1.5 Impedance. 22 5.1.6 Degradation of performance c
24、aused by overvoltages . 22 5.2 Performance requirements and recommendations for receiver lead . 22 5.3 Performance requirements and recommendations for system outlets . 22 5.3.1 Safety 22 5.3.2 Quality grading 22 5.3.3 Mechanical requirements . 23 5.3.4 Electrical parameters and requirements . 23 5.
25、4 Performance requirements and recommendations for splitters and taps 26 5.4.1 Description 26 5.4.2 Mechanical requirements for connectors 26 5.4.3 Electrical parameters and requirements . 26 5.5 Performance requirements and recommendations for all other passive equipment . 28 5.5.1 Description 28 5
26、5.2 Mechanical requirements for connectors 28 5.5.3 Electrical parameters and requirements . 28 Annex A (informative) Measurement errors which occur due to mismatched equipment . 30 Annex B (informative) Differences in some countries . 31 Bibliography 32 Figure 1 Test set-up for the measurement of
27、attenuation . 14 Figure 2 Test set-up for the measurement of isolation 14 Figure 3 Measurement of through-loss . 15 Figure 4 Carrier/hum ratio 16 Figure 5 Test set-up for power injectors . 17 Figure 6 Test set-up for passive equipment, excluding power injectors 18 Figure 7 Oscilloscope display 18 Fi
28、gure 8 Harmonic/Intermodulation test circuit . 20 Figure 9 Types of losses of system outlets . 25 Figure A.1 Error concerning return loss measurement 30 Figure A.2 Maximum ripple 30 Table 1 Return loss of system outlets 23 Table 2 Return loss of looped-through system outlets 24 Table 3 Maximum retur
29、n path signal level derived from maximum allowed intermodulation distortion level in the downstream frequency band . 26 Table 4 Return loss of splitters and taps 26 Table 5 Isolation of splitters . 27 Table 6 Return loss for all other passive equipment . 28 4 60728-4 IEC:2007 INTERNATIONAL ELECTROTE
30、CHNICAL COMMISSION _ CABLE NETWORKS FOR TELEVISION SIGNALS, SOUND SIGNALS AND INTERACTIVE SERVICES Part 4: Passive wideband equipment for coaxial cable networks FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardisation comprising all national ele
31、ctrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardisation in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specif
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39、ng legal 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 th
40、is publication. 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 60728-4 has been prepared by technical area 5: C
41、able networks for television signals, sound signals and interactive services, of IEC technical committee 100: Audio, video and multimedia systems and equipment. This third edition cancels and replaces the second edition published in 2000, of which it constitutes a technical revision. This edition in
42、cludes the following significant technical changes with respect to the previous edition. Subclause 3.1 includes several new or modified definitions. Clause 4 includes added test methods for attenuation, isolation, through-loss, group delay variation, amplitude frequency response and two carrier inte
43、rmodulation measurements for second- and third-order products. Clause 5 includes updated and new performance requirements. 60728-4 IEC:2007 5 This bilingual version (2012-11) corresponds to the monolingual English version, published in 2007-08. The text of this standard is based on the following doc
44、uments: FDIS Report on voting 100/1243/FDIS 100/1275/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. The French version of this standard has not been voted upon. This publication has been drafted in accordance wi
45、th the ISO/IEC Directives, Part 2. For the differences existing in some countries, see Annex B The list of all parts of the IEC 60728 series, under the general title Cable networks for television signals, sound signals and interactive services, can be found on the IEC website. The committee has deci
46、ded that the contents of this publication will remain unchanged until the maintenance result date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition,
47、or amended. 6 60728-4 IEC:2007 INTRODUCTION Standards of the IEC 60728 series deal with cable networks including equipment and associated methods of measurement for headend reception, processing and distribution of television signals, sound signals and their associated data signals and for processin
48、g, interfacing and transmitting all kinds of signals for interactive services using all applicable transmission media. This includes CATV 1 -networks; MATV-networks and SMATV-networks; individual receiving networks; and all kinds of equipment, systems and installations installed in such networks. Th
49、e extent of this standardization work is from the antennas and/or special signal source inputs to the headend or other interface points to the network up to the terminal input. 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. 1 This word encom
