1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationCable networks for television signals, sound signals and interactive servicesPart 3-1: Methods of measurement of non-linearity for full digital channel load with DVB-C signalsBS
2、EN 60728-3-1:2012National forewordThis British Standard is the UK implementation of EN 60728-3-1:2012. It is identical to IEC 60728-3-1:2012.The UK participation in its preparation was entrusted by Technical Com-mittee EPL/100, Audio, video and multimedia systems and equipment, to Subcommittee EPL/1
3、00/4, Cable distribution equipment and systems.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Sta
4、ndards Institution 2013.Published by BSI Standards Limited 2013 ISBN 978 0 580 76645 9 ICS 33.060; 33.170Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Stand-ards Policy and Strategy Committee on 28 Febr
5、uary 2013.Amendments issued since publicationDate Text affectedBRITISH STANDARDBS EN 60728-3-1:2012EUROPEAN STANDARD EN 60728-3-1 NORME EUROPENNE EUROPISCHE NORM August 2012 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Ko
6、mitee fr Elektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels 2012 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60728-3-1:2012 E ICS 33.060; 33.170 English version Cable networks for television signa
7、ls, sound signals and interactive services - Part 3-1: Methods of measurement of non-linearity for full digital channel load with DVB-C signals (IEC 60728-3-1:2012) Rseaux de distribution par cbles pour signaux de tlvision, signaux de radiodiffusion sonore et services interactifs - Partie 3-1: Mthod
8、es de mesure de la non-linarit pour une charge faite seulement de porteuses en modulation numrique avec des signaux DVB-C (CEI 60728-3-1:2012) Kabelnetze fr Fernsehsignale, Tonsignale und interaktive Dienste - Teil 3-1: Messverfahren fr die Nichtlinearitt bei voller digitaler Kanallast mit DVB-C-Sig
9、nalen (IEC 60728-3-1:2012) This European Standard was approved by CENELEC on 2012-08-10. 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
10、 lists and bibliographical references 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 translati
11、on under the responsibility 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, Denma
12、rk, Estonia, Finland, Former 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. BS EN 60728
13、-3-1:2012EN 60728-3-1:2012 - 2 - Foreword The text of document 100/1969/FDIS, future edition 1 of IEC 60728-3-1, 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 equipment“ was submi
14、tted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 60728-3-1:2012. 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) 2013-05-10 latest date by which the na
15、tional standards conflicting with the document have to be withdrawn (dow) 2015-08-10 Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC and/or CEN shall not be held responsible for identifying any or all such patent rights. E
16、ndorsement notice The text of the International Standard IEC 60728-3-1:2012 was approved by CENELEC as a European Standard without any modification. BS EN 60728-3-1:2012- 3 - EN 60728-3-1:2012 Annex ZA (normative) Normative references to international publications with their corresponding European p
17、ublications 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 references, the latest edition of the referenced document (including any amendments) appl
18、ies. NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 60728-3 - Cable networks for television signals, sound signals and interactive services - Part 3: Active wideband equipment for
19、 cable networks EN 60728-3 - ISO/IEC 13818-1 2007 Information technology - Generic coding of moving pictures and associated audio information: Systems - - BS EN 60728-3-1:2012 2 60728-3-1 IEC:2012 CONTENTS INTRODUCTION . 5 1 Scope . 6 2 Normative references . 6 3 Terms, definitions, symbols and abbr
20、eviations 6 Terms and definitions 6 3.1Symbols 7 3.2Abbreviations 7 3.34 Methods of measurement of non-linearity for full digital channel load . 8 Maximum operating output level using the measurement of bit error ratio 4.1(BER) 8 General . 8 4.1.1Equipment required . 8 4.1.2Connection of equipment .
21、 9 4.1.3Measurement procedure 9 4.1.4Presentation of the results . 10 4.1.5Measurement of the carrier-to-interference noise ratio CINR . 10 4.2General . 10 4.2.1Equipment required . 10 4.2.2Connection of the equipment . 11 4.2.3Measurement procedure 11 4.2.4Presentation of the results . 12 4.2.55 Eq
22、uipment characteristics required to be published 12 Annex A (informative) Examples of measurement channels . 13 Annex B (normative) Null packet and PRBS definitions 14 Bibliography 16 Figure 1 BER measurement test configuration . 9 Figure 2 CINR measurement test setup 11 Figure 3 Plot of CINR curve
23、versus EUT channel output signal level in dB(V) . 12 Table B.1 Null transport stream packet definition . 15 BS EN 60728-3-1:201260728-3-1 IEC:2012 5 INTRODUCTION Standards of the IEC 60728 series deal with cable networks including equipment and associated methods of measurement for headend reception
24、, processing and distribution of television signals, sound signals and their associated data signals and for processing, interfacing and transmitting all kinds of signals for interactive services using all applicable transmission media. This includes CATV1-networks, MATV-networks and SMATV-networks,
25、 individual receiving networks, and all kinds of equipment, systems and installations installed in such networks. For active equipment with balanced RF signal ports this standard applies only to those ports which carry RF broadband signals for services as described in the scope of this standard. The
26、 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
27、coaxial, balanced and optical cables and accessories thereof is excluded. _ 1This word encompasses the HFC networks used nowadays to provide telecommunications services, voice, data, audio and video both broadcast and narrowcast. BS EN 60728-3-1:2012 6 60728-3-1 IEC:2012 CABLE NETWORKS FOR TELEVISIO
28、N SIGNALS, SOUND SIGNALS AND INTERACTIVE SERVICES Part 3-1: Active wideband equipment for cable networks Methods of measurement of non-linearity for full digital channel load with DVB-C signals 1 Scope This part of IEC 60728 is applicable to the methods of non-linearity measurement for cable network
29、s which carry only digitally modulated television signals, sound signals and signals for interactive services. These methods take into account the specific signal form and behaviour of digitally modulated signals which differ from the analogue broadcast signals represented mainly by the existence of
30、 discrete carrier signals. 2 Normative references 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 references, the latest edition of the referenced do
31、cument (including any amendments) applies. IEC 60728-3, Cable networks for television signals, sound signals and interactive services Part 3: Active wideband equipment for cable networks ISO/IEC 13818-1:2007, Information technology Generic coding of moving pictures and associated audio information:
32、Systems 3 Terms, definitions, symbols and abbreviations For the purposes of this document, the following terms, definitions, symbols and abbreviations apply. Terms and definitions 3.1Subclause 3.1 of IEC 60728-3 is applicable except as follows. Addition: 3.1.25 maximum operating output level average
33、 channel power level of a digitally modulated signal in the 256 QAM format with a symbol rate of 6,9 MSymb/s with 15 % cosine roll-off, measured with full digital channel load Note 1 to entry: This maximum operating output level has no direct correlation to that derived from CTB/CSO measurements of
34、analogue or mixed analogue-digital channel loads. BS EN 60728-3-1:201260728-3-1 IEC:2012 7 Symbols 3.2The following graphical symbols are used in the figures of this standard. These symbols are either listed in IEC 60617 or based on symbols defined in IEC 60617. Symbols Terms Symbols Terms Equipment
35、 Under Test based on IEC 60617-S00059 (2001-07) Band-pass filter IEC 60617-S01249 (2001-07) Variable attenuator IEC 60617-S01245 (2001-07) Spectrum analyzer (electrical) based on IEC 60617-S00910 (2001-07) Combiner based on IEC 60617-S00059 (2001-07) Amplifier IEC 60617-S01239 (2001-07 Modulator bas
36、ed on IEC 60617-S01278 (2001-07) Demodulator based on IEC 60617-S01278 (2001-07 Abbreviations 3.3BER bit error ratio CATV community antenna television (system) CINR carrier to intermodulation noise ratio CSO composite second order CTB composite triple beat DVB digital video broadcasting EUT equipmen
37、t under test HFC hybrid fibre coax MATV master antenna television (system) MEAS measured PRBS pseudo-random bit sequence QAM quadrature amplitude modulation RF radio frequency SMATV satellite master antenna television (system) SYS system UHF ultra-high frequency VHF very-high frequency Umax (N)maxim
38、um operating output level with channel load of 112 carriers in the 256 QAM format EUTAP(f) BS EN 60728-3-1:2012 8 60728-3-1 IEC:2012 4 Methods of measurement of non-linearity for full digital channel load Maximum operating output level using the measurement of bit error ratio (BER) 4.1General 4.1.1T
39、he method of measurement describes the measurement of the bit error ratio (BER) (before Reed Solomon decoder of the measurement receiver) of the output signal of the equipment under test (EUT) (e.g. an amplifier) when handling a full load of digitally modulated TV signals. This test is able to defin
40、e the performance (maximum output level) of the EUT when loaded with a number (N = 112) of digitally modulated signals in the 256 QAM format covering a frequency range from 110 MHz to 1 006 MHz with a raster of 8 MHz. NOTE 1 Due to different channel spacing plans in use, the lower frequency limit ma
41、y not be exactly 110 MHz, but may differ by some megahertz, e.g. 109 MHz. In the same way, the upper frequency limit may not be exactly 1 006 MHz, but may differ by some megahertz. The notation 110 MHz to 1 006 MHz in this standard is intended to include such small deviations. The number N can be re
42、duced according to the used frequency range of the EUT, e.g. to N = 94 for 862 MHz upper frequency limit. In all cases the EUT shall be fully loaded. The measurement shall be performed for the following three channels: a) the lowest RF channel according to the specified operating frequency range of
43、the EUT; b) the highest RF channel according to the specified operating frequency range of the EUT; c) an RF channel at the arithmetic mean between the lowest and the highest RF channels according to a) and b). NOTE 2 Examples of these measurement channels are given in informative Annex B. The worst
44、 case value of Umax (N)of the EUT out of the three measured values according to a) to c) shall be presented together with the worst case channel. Equipment required 4.1.2The equipment required is the following: a) a number N of 256 QAM modulators (with channel coders) having a suitable linearity (BE
45、R better than 1 1010) and an occupied bandwidth of 8 MHz. The channels generated by the modulators shall be placed in the frequency range from 110 MHz to 1 006 MHz or in a subset of this frequency range with a raster of 8 MHz; b) a number N of null packet or of pseudo-random bit sequence (PRBS) gene
46、rators (see Annex B); c) a combiner for the output signals of the 256 QAM modulators with negligible distortion; d) a wide band amplifier with suitable linearity and gain over the full bandwidth of the EUT; e) precision attenuators (1 dB steps) to be placed before and after EUT; f) a test receiver a
47、ble to measure the BER of the received 256 QAM signals; its distortion should be sufficiently lower than that to be measured (e.g. a BER better than 1 1010). All applied QAM channels (channel load and measurement channels) shall have the same output level within a deviation of maximum 0,5 dB. The to
48、tal BER introduced by source and measurement equipment shall not exceed 1 1010. BS EN 60728-3-1:201260728-3-1 IEC:2012 9 Connection of equipment 4.1.3Connect the measuring equipment as indicated in Figure 1. The input signal is applied to the equipment under test (EUT) input and its output signal le
49、vel is measured by means of a suitable measuring receiver, connected to a BER measuring set if not included in the measuring receiver. GBER measuring setEUTAGGChannelcoderChannel coderChannelcoderVariableattenuator AVariableattenuator BANull packetor PRBSgeneratorRF-modulatorMeasuringreceiver withRF demodulatorFigure 1 BER measurement test configuration Measurement procedure 4.1.4The measurement shall be performed according to the steps described hereafter. a) T
