1、 IEC 60728-4Edition 3.0 2007-08INTERNATIONAL STANDARD Cable networks for television signals,sound signals and interactive services Part 4:Passive wideband equipment for coaxial cable networks IEC 60728-4:2007(E)LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIE
2、D BY BOOK SUPPLY BUREAU.THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2007 IEC,Geneva,Switzerland All rights reserved.Unless otherwise specified,no part of this publication may be reproduced or utilized in any form or by any means,electronic or mechanical,including photocopying and microfilm,wit
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9、22 919 02 11 Fax:+41 22 919 03 00 LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.IEC 60728-4Edition 3.0 2007-08INTERNATIONAL STANDARD Cable networks for television signals,sound signals and interactive services Part 4:Passive wideband
10、 equipment for coaxial cable networks INTERNATIONAL ELECTROTECHNICAL COMMISSION VICS 33.060.40;33.170 PRICE CODEISBN 2-8318-9265-1LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.2 60728-4 IEC:2007(E)CONTENTS FOREWORD.4 INTRODUCTION.6 1
11、 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 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.1
12、4 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 Definition.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
13、 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 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-m
14、odulation ratio.19 4.7.5 Presentation of the results.20 4.8 Two-carrier intermodulation measurements for second-and third-order products.20 5 Performance requirements and recommendations.21 5.1 General performance requirements and recommendations.21 5.1.1 Safety.21 5.1.2 Electromagnetic compatibilit
15、y(EMC).21 5.1.3 Environmental.21 5.1.4 Marking.22 5.1.5 Impedance.22 LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.60728-4 IEC:2007(E)3 5.1.6 Degradation of performance caused by overvoltages.22 5.2 Performance requirements and recom
16、mendations 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 5.4 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
