1、 IEC 60728-10 Edition 3.0 2014-03 INTERNATIONAL STANDARD NORME INTERNATIONALE Cable networks for television signals, sound signals and interactive services Part 10: System performance for return paths Rseaux de distribution par cbles pour signaux de tlvision, signaux de radiodiffusion sonore et serv
2、ices interactifs Partie 10: Performances des systmes de voie de retour IEC 60728-10:2014-03(en-fr) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2014 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or
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20、ble networks for television signals, sound signals and interactive services Part 10: System performance for return paths Rseaux de distribution par cbles pour signaux de tlvision, signaux de radiodiffusion sonore et services interactifs Partie 10: Performances des systmes de voie de retour INTERNATI
21、ONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE XA ICS 33.060.40 PRICE CODE CODE PRIX ISBN 978-2-8322-1438-1 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obt
22、ained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. 2 IEC 60728-10:2014 IEC 2014 CONTENTS FOREWORD . 6 INTRODUCTION . 8 1 Scope 9 2 Normative references 9 3 Terms, definitions, symbols and abbreviatio
23、ns . 10 3.1 Terms and definitions . 10 3.2 Symbols . 13 3.3 Abbreviations . 14 4 Methods of measurement 14 4.1 General 14 4.2 Set-up of the network . 15 4.3 Measurement of channel level 15 General 15 4.3.1Equipment required 15 4.3.2Connection of the equipment 16 4.3.3Measurement procedure for digita
24、lly modulated carriers . 16 4.3.4Measurement procedure for intermittent digitally modulated 4.3.5 carriers . 17 Presentation of the results 18 4.3.6 4.4 Measurement of amplitude response variation . 18 Background 18 4.4.1Equipment required 18 4.4.2Connection of the equipment 18 4.4.3Calibration of e
25、quipment . 18 4.4.4Method of measurement . 19 4.4.5Presentation of the results 19 4.4.6 4.5 Measurement of signal to noise ratio (S D,RF /N) . 19 General 19 4.5.1Equipment required 19 4.5.2Connection of the equipment 19 4.5.3Measurement procedure . 19 4.5.4Presentation of the results 20 4.5.5 4.6 Me
26、asurement of multiple interference 20 General 20 4.6.1Equipment required 21 4.6.2Connection of the equipment 21 4.6.3Measurement procedure . 21 4.6.4Processing of the data 21 4.6.5Presentation of the results 21 4.6.6 4.7 Measurement of impulse noise . 22 General 22 4.7.1Equipment required 22 4.7.2Co
27、nnection of the equipment 22 4.7.3Measurement procedure . 22 4.7.4Processing of the data and presentation of the results 23 4.7.5IEC 60728-10:2014 IEC 2014 3 4.8 Measurement of echo ratio . 23 General 23 4.8.1Equipment required 24 4.8.2Connection of the equipment 25 4.8.3Measurement procedure . 25 4
28、.8.4Presentation of the results 25 4.8.5 4.9 Measurement of group delay variation 25 4.10 Measurement of frequency error 26 General 26 4.10.1Equipment required 26 4.10.2Connection of the equipment 26 4.10.3Measurement procedure . 26 4.10.4Presentation of the result 27 4.10.5 4.11 Measurement of bit
29、error ratio (BER) . 27 General 27 4.11.1Equipment required 27 4.11.2Connection of the equipment 28 4.11.3Measurement procedure . 28 4.11.4Presentation of the results 28 4.11.5 4.12 Noise power ratio (NPR) measurement on return path . 28 General 28 4.12.1Equipment required 29 4.12.2Connection of the
30、equipment 29 4.12.3Measurement procedure . 30 4.12.4Presentation of the results 31 4.12.5Recommended correction factors 31 4.12.6Precautions during measurement 32 4.12.7NPR dynamic range 32 4.12.8 4.13 10-Tone measurement . 33 General 33 4.13.1Measurement principle 34 4.13.2Measurement procedure . 3
31、4 4.13.3 4.14 Modulation error ratio (MER) measurement on return path . 35 General 35 4.14.1Equipment required 36 4.14.2Connection of the equipment 36 4.14.3Measurement procedure . 36 4.14.4Presentation of the results 37 4.14.5 5 System performance requirements 37 5.1 General 37 5.2 Analogue paramet
32、ers that influence the system performance . 40 5.3 General requirements 42 Impedance 42 5.3.1Maximum signal level . 42 5.3.2 5.4 Specific system performance requirements 42 6 System performance recommendations Return path bandwidth 45 6.1 Frequency allocation 45 6.2 Transmission quality in the retur
33、n path frequency ranges . 45 Annex A (normative) Correction factors for noise . 47 4 IEC 60728-10:2014 IEC 2014 A.1 Signal level measurement 47 A.2 Noise level measurement . 47 Annex B (normative) Correction factor for a spectrum analyser 49 Annex C (normative) Null packet and PRBS definitions 50 C.
34、1 Null packet definition 50 C.2 PRBS definition 51 Bibliography 52 Figure 1 Reference points of an active return path system (example) . 15 Figure 2 Time domain representation of an upstream burst with marker on the preamble of the DOCSIS signal 17 Figure 3 Arrangement of test equipment for measurem
35、ent of amplitude response variation 18 Figure 4 Echo rating graticule 24 Figure 5 Arrangement of test equipment for measurement of echo ratio . 25 Figure 6 Test set-up for frequency stability measurement 26 Figure 7 Principle of BER measurement . 27 Figure 8 Band-pass and band-stop filters response
36、29 Figure 9 NPR test set up 30 Figure 10 NPR versus RF power density applied at input of optical transmitter and determination of OMI 100 % 31 Figure 11 Example of the frequency response of the optional band-pass filter . 31 Figure 12 Example of NPR dynamic range . 33 Figure 13 Dynamic range plotted
37、 versus NPR 33 Figure 14 Alternative NPR measurement principle . 34 Figure 15 Relationship between classical NPR method and multi-tone method 35 Figure 16 Test set-up for modulation error ratio (MER) measurement 36 Figure 17 Example of constellation diagram for a 64QAM modulation format . 37 Figure
38、18 Return path signals affecting forward path signals 38 Figure 19 Forward path signals affecting return path signals 39 Figure 20 Return path signals of service 1 affecting return path signals of a different service (e.g. service 2) 39 Figure 21 Return path signals of a specific service (e.g. servi
39、ce 2) affecting return path signals of the same service . 39 Figure 22 Identification of the most common sub-bands within the return path band with limited transmission quality 46 Figure A.1 Noise correction factor CF versus measured level difference D . 48 Table 1 Examples of the Nyquist bandwidth
40、of digitally modulated carriers 16 Table 2 Band-stop filter notch frequencies . 29 Table 3 Summary of the requirements for MER according to ETSI EN 302 878-2, V.1.1.1 (2011-11), (clause 6.2.22.3.2) . 41 Table 4 System performance requirements for different modulation techniques for BER = 10 443 Tabl
41、e 5 Comparison of system performance parameters given in Table 4 with those given in ETSI EN 302 878-2, V.1.1.1 (2011-11), specifications 44 IEC 60728-10:2014 IEC 2014 5 Table 6 Return path frequency ranges . 45 Table 7 Reasons for quality reduction in sub-bands of the return path . 45 Table A.1 Noi
42、se correction factor . 47 Table C.1 Null transport stream packet definition . 51 6 IEC 60728-10:2014 IEC 2014 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ CABLE NETWORKS FOR TELEVISION SIGNALS, SOUND SIGNALS AND INTERACTIVE SERVICES Part 10: System performance for return paths FOREWORD 1) The Interna
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