1、BSI Standards PublicationCable networks for television signals, sound signals and interactive servicesPart 10: System performance for return pathsBS EN 60728-10:2014National forewordThis British Standard is the UK implementation of EN 60728-10:2014. It isidentical to IEC 60728-10:2014. It supersedes
2、 BS EN 60728-10:2006 which iswithdrawn.The UK participation in its preparation was entrusted by Technical Com-mittee EPL/100, Audio, video and multimedia systems and equipment, to Subcommittee EPL/100/4, Cable distribution equipment and systems.A list of organizations represented on this committee c
3、an be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions ofa contract. Users are responsible for its correct application. The British Standards Institution 2014.Published by BSI Standards Limited 2014ISBN 978 0 580 76335 9ICS 33.060.40Compli
4、ance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 June 2014.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 60728-10:2014EUROPEAN
5、STANDARD NORME EUROPENNE EUROPISCHE NORM EN 60728-10 June 2014 ICS 33.060.40 Supersedes EN 50083-10:2002, EN 60728-10:2006 English Version Cable networks for television signals, sound signals and interactive services - Part 10: System performance for return paths (IEC 60728-10:2014) Rseaux de distri
6、bution par cbles pour signaux de tlvision, signaux de radiodiffusion sonore et services interactifs - Partie 10: Performances des systmes de voie de retour (CEI 60728-10:2014) Kabelnetze fr Fernsehsignale, Tonsignale und interaktive Dienste - Teil 10: Rckweg-Systemanforderungen (IEC 60728-10:2014) T
7、his European Standard was approved by CENELEC on 2014-04-15. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical r
8、eferences concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility
9、of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former
10、 Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical
11、 Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN
12、60728-10:2014 E BS EN 60728-10:2014EN 60728-10:2014 - 2 - Foreword The text of document 100/2247/FDIS, future edition 3 of IEC 60728-10, prepared by Technical Area 5 “Cable networks for television signals, sound signals and interactive services” of IEC/TC 100 “Audio, video and multimedia systems and
13、 equipment“ was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 60728-10:2014. The following dates are fixed: latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2015-01-15 latest
14、date by which the national standards conflicting with the document have to be withdrawn (dow) 2017-04-15 This document supersedes EN 50083-10:2002 and EN 60728-10:2006. EN 60728-10:2014 includes the following significant technical changes with respect to EN 60728-10:2006: - update on the state-of-th
15、e-art of return path transmission in cable networks; - provisions for DOCSIS 3.0 and EuroDOCSIS 3.0 transmission standards; - revision of Subclause 4.3 on measurement of channel level; - new Subclause 4.12 for method of measurement of noise power ratio (NPR) on return paths; - new Subclause 4.13 for
16、 10-tone measurements; - new Subclause 4.14 for method of measurement of modulation error ratio (MER); - revision of Subclause 5.2 on analogue parameters influencing system performance. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent righ
17、ts. CENELEC and/or CEN shall not be held responsible for identifying any or all such patent rights. Endorsement notice The text of the International Standard IEC 60728-10:2014 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the foll
18、owing notes have to be added for the standards indicated: IEC 60728-3 NOTE Harmonized as EN 60728-3. IEC 60728-4 NOTE Harmonized as EN 60728-4. IEC 60728-6 NOTE Harmonized as EN 60728-6. IEC 60728-11 NOTE Harmonized as EN 60728-11. .BS EN 60728-10:2014- 3 - EN 60728-10:2014 Annex ZA (normative) Norm
19、ative references to international publications with their corresponding European publications The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated referen
20、ces, the latest edition of the referenced document (including any amendments) applies. NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. NOTE 2 Up-to-date information on the latest versions of the European Standards li
21、sted in this annex is available here: www.cenelec.eu Publication Year Title EN/HD Year Cable networks for television signals, sound signals and interactive services - Part 10-1: Guidelines for the implementation of return paths in cable networks CLC/TR 50083-10-1 2009 1)IEC 60728 Series Cable networ
22、ks for television signals, sound signals and interactive services EN 60728 Series IEC 60728-1 - Cable networks for television signals, sound signals and interactive services - Part 1: System performance of forward paths EN 60728-1 - IEC 60728-2 - Cable networks for television signals, sound signals
23、and interactive services - Part 2: Electromagnetic compatibility for equipment EN 50083-2 - IEC 60728-5 - Cable networks for television signals, sound signals and interactive services - Part 5: Headend equipment EN 60728-5 - IEC 60728-12 - Cabled distribution systems for television and sound signals
24、 - Part 12: Electromagnetic compatibility of systems EN 50083-8 - ISO/IEC 13818-1 2007 2)Information technology - Generic coding of moving pictures and associated audio information: Systems - - ITU-R Recommendation BT.470 - Conventional analogue television systems - - ETSI ES 200 800 - Digital Video
25、 Broadcasting (DVB); DVB interaction channel for Cable TV distribution systems (CATV) - - 1)Superseded by CLC/TR 50083-10-1:2014. 2)Superseded by ISO/IEC 13818-1:2013. BS EN 60728-10:2014EN 60728-10:2014 - 4 - ETSI EN 302 878-2 2011 Access, Terminals, Transmission and Multiplexing (ATTM); Third Gene
26、ration Transmission Systems for Interactive Cable Television Services - IP Cable Modems; Part 2: Physical Layer; DOCSIS 3.0 - - BS EN 60728-10:2014 2 IEC 60728-10:2014 IEC 2014 CONTENTS INTRODUCTION . 8 1 Scope 9 2 Normative references 9 3 Terms, definitions, symbols and abbreviations . 10 3.1 Terms
27、 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 digitally modulated car
28、riers . 16 4.3.4Measurement procedure for intermittent digitally modulated 4.3.5carriers . 17 Presentation of the results 18 4.3.64.4 Measurement of amplitude response variation . 18 Background 18 4.4.1Equipment required 18 4.4.2Connection of the equipment 18 4.4.3Calibration of equipment . 18 4.4.4
29、Method of measurement . 19 4.4.5Presentation of the results 19 4.4.64.5 Measurement of signal to noise ratio (SD,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 4.5.54.6 Measurement of multiple i
30、nterference 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 4.6.64.7 Measurement of impulse noise . 22 General 22 4.7.1Equipment required 22 4.7.2Connection of the equipmen
31、t 22 4.7.3Measurement procedure . 22 4.7.4Processing of the data and presentation of the results 23 4.7.5BS EN 60728-10:2014IEC 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 4.8.4P
32、resentation of the results 25 4.8.54.9 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 4.10.54.11 Measurement of bit error r
33、atio (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 4.11.54.12 Noise power ratio (NPR) measurement on return path . 28 General 28 4.12.1Equipment required 29 4.12.2Connection of the equipmen
34、t 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 4.12.84.13 10-Tone measurement . 33 General 33 4.13.1Measurement principle 34 4.13.2Measurement procedure . 34 4.13.34
35、.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 4.14.55 System performance requirements 37 5.1 General 37 5.2 Analogue parameters that in
36、fluence the system performance . 40 5.3 General requirements 42 Impedance 42 5.3.1Maximum signal level . 42 5.3.25.4 Specific system performance requirements 42 6 System performance recommendations Return path bandwidth 45 6.1 Frequency allocation 45 6.2 Transmission quality in the return path frequ
37、ency ranges . 45 Annex A (normative) Correction factors for noise . 47 BS EN 60728-10:2014 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 definitio
38、ns 50 C.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
39、measurement 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 r
40、esponse 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
41、 plotted 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
42、 Figure 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.
43、g. service 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 ba
44、ndwidth 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 = 104
45、43 Table 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 BS EN 60728-10:2014IEC 60728-10:2014 IEC 2014 5 Table 6 Return path frequency ranges . 45 Table 7 Reasons for quality reduction in sub-bands of the retu
46、rn path . 45 Table A.1 Noise correction factor . 47 Table C.1 Null transport stream packet definition . 51 BS EN 60728-10:2014 8 IEC 60728-10:2014 IEC 2014 INTRODUCTION Standards and deliverables of IEC 60728 series deal with cable networks including equipment and associated methods of measurement f
47、or 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-multiplexing
48、 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 cable network
49、s, distribution and receiving systems. The 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 of the customer premises equipment. The standardization work will consider coexistence with users of the RF spectrum in wired and wireless transmission systems. The standardization of any user terminals (i.e. tuners, receivers, decoders,
