1、 IEC 60728-5 Edition 3.0 2015-12 INTERNATIONAL STANDARD NORME INTERNATIONALE Cable networks for television signals, sound signals and interactive services Part 5: Headend equipment Rseaux de distribution par cbles pour signaux de tlvision, signaux de radiodiffusion sonore et services interactifs Par
2、tie 5: quipements de tte de rseau IEC 60728-5:2015-12(en-fr) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2015 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 mechanica
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20、und signals and interactive services Part 5: Headend equipment Rseaux de distribution par cbles pour signaux de tlvision, signaux de radiodiffusion sonore et services interactifs Partie 5: quipements de tte de rseau INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE
21、 ICS 33.060.40 ISBN 978-2-8322-3016-9 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 vous assurer que vous av
22、ez obtenu cette publication via un distributeur agr. 2 IEC 60728-5:2015 IEC 2015 CONTENTS FOREWORD . 9 INTRODUCTION . 11 1 Scope 12 2 Normative references 15 3 Terms, definitions, symbols and abbreviations . 17 3.1 Terms and definitions 17 3.2 Symbols 21 3.3 Abbreviations 22 4 Methods of measurement
23、 24 4.1 Methods of measurement for digitally modulated signals . 24 4.1.1 General . 24 4.1.2 Basic assumptions and measurement interfaces 24 4.1.3 Signal level for digitally modulated signals . 24 4.2 Single-channel intermodulation specification for channel amplifier and frequency converter 26 4.3 T
24、hree-carrier intermodulation measurement 27 4.4 Two carrier intermodulation measurements for second- and third-order products 28 4.4.1 General . 28 4.4.2 Intermodulation products with test signals at frequencies f aand f b29 4.4.3 Signal levels 29 4.5 Carrier-to-spurious signal ratio at the output .
25、 29 4.5.1 Carrier-to-spurious signal ratio at the output of equipment for AM TV systems . 29 4.5.2 Carrier-to-spurious signal ratio at the output of equipment for FM TV systems . 30 4.5.3 Shoulder attenuation . 31 4.6 Signal-to-noise measurement 32 4.6.1 Television carrier-to-noise ratio (analogue m
26、odulated signals) . 32 4.6.2 RF signal-to-noise ratio (S D,RF /N) for digitally modulated signals . 35 4.7 Differential gain and phase for PAL/SECAM signals 36 4.7.1 General . 36 4.7.2 Differential gain (for PAL/SECAM only) 37 4.7.3 Differential phase 38 4.8 Group delay measurements 41 4.8.1 Group d
27、elay variation of analogue TV signals 41 4.8.2 Procedure for the measurement of group delay variation on DVB channel converters 42 4.9 Phase noise of an RF carrier. 45 4.9.1 General . 45 4.9.2 Equipment required . 45 4.9.3 Connection of the equipment . 46 4.9.4 Measurement procedure 46 4.9.5 Present
28、ation of the results . 46 4.10 Hum modulation of carrier . 48 4.10.1 General . 48 4.10.2 Description of the method of measurement 48 IEC 60728-5:2015 IEC 2015 3 4.10.3 Measuring procedure . 49 4.10.4 Calculating the hum modulation ratio . 50 4.11 2T-pulse response, K-factor 51 4.12 Chrominance-lumin
29、ance delay inequalities (20T-pulse method) 52 4.13 Luminance non-linearity 54 4.14 Intermodulation distortion (FM stereo radio) 54 4.14.1 General . 54 4.14.2 Equipment required . 55 4.14.3 Connection of equipment . 55 4.14.4 Measurement . 55 4.15 Decoding margin (teletext) 55 4.15.1 General . 55 4.1
30、5.2 Method of measurement and measuring set-up (Figure 31) 56 4.15.3 Applicability of measuring set-up . 56 5 Performance requirements and recommendations . 56 5.1 Safety . 56 5.2 Electromagnetic compatibility 56 5.3 Environmental . 56 5.4 Marking . 57 5.4.1 Marking of equipment 57 5.4.2 Marking of
31、ports . 57 6 Equipment characteristics required to be met 57 6.1 General . 57 6.2 Power supply voltage 58 6.3 RF signal requirements . 58 6.3.1 Impedance (input) 58 6.3.2 Impedance (output) 58 6.3.3 Return loss (input, output) of equipment 58 6.3.4 Return loss (output) of headend . 58 6.3.5 Typical
32、back-off for digital against analogue signals 58 6.3.6 Immunity against other signals in the FM radio and TV range 59 6.3.7 Carrier-to-spurious-signals ratio at output in the frequency range of 40 MHz to 862 MHz . 59 6.3.8 Image rejection for AM TV and FM radio 60 6.3.9 Carrier to local oscillator s
33、ignal ratio at the output for AM TV and FM radio 60 6.3.10 Frequency stability 60 6.3.11 Phase noise of digital modulated signals at the output of the headend . 61 6.3.12 In-channel group delay variation for digital modulated signals . 62 6.3.13 In-channel peak-to-peak amplitude response variation f
34、or digitally modulated signals 63 6.3.14 Stability of sound intercarrier . 63 6.3.15 Stability of residual carrier amplitude . 63 6.3.16 Frequency stability SAT IF/IF converter 63 6.3.17 Typical modulation error ratio (MER) for a QAM signal 64 6.3.18 Minimum C/N values at the output of the headend .
35、 64 6.4 Composite video signal requirements 64 6.4.1 Impedance . 64 6.4.2 Return loss 65 4 IEC 60728-5:2015 IEC 2015 6.4.3 Signal voltage 65 6.4.4 Polarity 65 6.4.5 Offset voltage 65 6.5 Audio signal requirements . 65 6.5.1 Input impedance 65 6.5.2 Output impedance . 65 6.5.3 Signal level 65 6.6 Req
36、uirements for decoding margin (teletext) . 66 6.7 IF signal requirements (AM-TV) 66 6.7.1 Impedance . 66 6.7.2 Return loss 66 6.8 Antennas for terrestrial reception 66 6.8.1 Impedance . 66 6.8.2 Return loss 66 6.9 Antenna amplifier 66 7 Equipment characteristics required to be published . 67 7.1 Gen
37、eral . 67 7.2 Environmental conditions 67 7.3 Maximum permissible output level . 67 7.4 Operating range for output level 68 7.5 TV standard 68 7.6 Clamp . 68 7.7 Noise figure 68 7.7.1 Equipment without AGC . 68 7.7.2 Equipment with AGC 69 7.8 Data control signals, description of interface . 69 7.9 O
38、utput level stability for TV modulators, TV converters and pilot generators . 69 7.10 Pilot signal 69 7.11 Differential gain and phase . 70 7.11.1 Differential gain . 70 7.11.2 Differential phase 70 7.12 Group delay variation for analogue TV signals 70 7.13 Luminance non-linearity 70 7.14 2T-pulse .
39、 71 7.15 20T-pulse . 71 7.16 Hum modulation 71 7.17 Television carrier-to-noise ratio . 71 7.18 Audio in TV . 71 7.19 Processing units for FM radio . 72 7.19.1 Audio input 72 7.19.2 Stereo crosstalk . 72 7.19.3 Total harmonic distortion . 72 7.19.4 Intermodulation distortion 72 7.19.5 Deviation, pre
40、-emphasis 72 7.20 Antennas for terrestrial reception 72 7.20.1 Antenna gain . 72 7.20.2 Sidelobe suppression 72 7.20.3 Return loss of antennas . 72 7.21 Control signals for outdoor units . 73 IEC 60728-5:2015 IEC 2015 5 Annex A (normative) Definition of the specified test frequency range for return
41、loss and noise figure . 74 A.1 Test frequency range for TV channel processor 74 A.2 Test frequency range for sub-band, full-band and multi-band amplifiers 74 A.3 Test frequency range for an FM radio channel processor 74 Annex B (informative) Audio connector for European system according to IEC 60130
42、-9 . 76 B.1 Contact allocation and mechanical dimensions . 76 B.2 Signal-to-pin allocations and applications . 76 Annex C (informative) Selectivity diagram for adjacent channel transmission . 77 C.1 General . 77 C.2 TV modulator for standard PAL B/G with mono or stereo sound 77 C.3 TV modulator for
43、standard PAL B/G with NICAM 728 in the lower adjacent channel . 78 C.4 Standard PAL I . 78 C.5 Group delay for the standards B/G, D/D1/K and I 79 C.6 Group delay pre-correction for TV modulator for standard B/G 79 C.7 TV modulator for standard SECAM L 80 C.8 Group delay for TV modulator for standard
44、 SECAM L . 80 C.9 TV modulator for standard PAL D/K with mono or stereo sound 81 Annex D (informative) Differences in some countries . 82 D.1 General . 82 D.2 Finland, Sweden . 82 Annex E (normative) Correction factors for noise . 83 E.1 Signal level measurement . 83 E.2 Noise level measurement 83 A
45、nnex F (informative) Digital signal level and bandwidth 85 F.1 RF/IF power (“carrier“) 85 F.2 Occupied bandwidth of a digital signal 85 F.2.1 QAM/QPSK modulation 85 F.2.2 OFDM modulation 86 F.3 Noise bandwidth . 86 F.3.1 General . 86 F.3.2 QAM/QPSK/8 PSK modulation . 87 F.3.3 OFDM modulation 87 F.4
46、Equivalent signal bandwidth 87 F.4.1 General . 87 F.4.2 QAM/QPSK/8 PSK modulation . 87 F.4.3 OFDM modulation 87 F.5 Examples 87 Annex G (informative) Minimum frequency distance of converted satellite signals in the IF range . 89 Annex H (informative) Measurement errors which occur due to mismatched
47、equipment . 90 Annex I (normative) Correction factor for spectrum analyser 91 Bibliography 92 Figure 1 Example of headend 13 Figure 2 Examples of IP gateways/interfaces at the input of headends 14 Figure 3 Examples of IP gateways and interfaces at the output of central headends 15 6 IEC 60728-5:2015
48、 IEC 2015 Figure 4 Frequencies and levels of test carriers . 27 Figure 5 Test carrier and interfering products in the pass band 28 Figure 6 Example showing products formed when 2f a f b. 29 Figure 7 Carrier-to-spurious signal ratio at the output 30 Figure 8 Carrier-to spurious signal ratio at the ou
49、tput . 31 Figure 9 Shoulder attenuation 31 Figure 10 Arrangement of test equipment for carrier-to-noise ratio measurement . 32 Figure 11 Arrangement of test equipment for measurement of differential gain and phase . 40 Figure 12 Signal D2 waveform . 40 Figure 13 Example of modified staircase 40 Figure 14 Measuring set-up for determining the group delay variation 41 Figure 15 RF signal (time domain) amplitude-modulated with
