IEC 60728-5:2007

IEC 60728-5
Edition 2.0 2007-08
INTERNATIONAL
STANDARD
Cable networks for television signals, sound signals and interactive services –
Part 5: Headend equipment
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IEC 60728-5
Edition 2.0 2007-08
INTERNATIONAL
STANDARD
Cable networks for television signals, sound signals and interactive services –
Part 5: Headend equipment
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
XC
ICS 33.060.40 ISBN 2-8318-9263-5

– 2 – 60728-5 © IEC:2007(E)
CONTENTS
FOREWORD.8
INTRODUCTION.10

1 Scope.11
2 Normative references .13
3 Terms, definitions, symbols and abbreviations.14
3.1 Terms and definitions .14
3.2 Symbols .19
3.3 Abbreviations .19
4 Methods of measurement .21
4.1 Methods of measurement for digitally modulated signals .21
4.1.1 Introduction .21
4.1.2 Basic assumptions and measurement interfaces.21
4.1.3 Signal level for digitally modulated signals.21
4.2 Single-channel intermodulation specification for channel amplifier and
frequency converter.23
4.3 Three-carrier intermodulation measurement .24
4.4 Two carrier intermodulation measurements for second- and third-order
products .25
4.4.1 Introduction .25
4.4.2 Intermodulation products with test signals at frequencies f and f .26
a b
4.4.3 Signal levels .26
4.5 Carrier-to-spurious signal ratio at the output.26
4.5.1 Carrier-to-spurious signal ratio at the output of equipment for AM-TV
systems.26
4.5.2 Carrier-to-spurious signal ratio at the output of equipment for FM-TV
systems.27
4.5.3 Shoulder attenuation .28
4.6 Signal-to-noise measurement .29
4.6.1 Television carrier-to-noise ratio (analogue modulated signals).29
4.6.2 RF signal-to-noise ratio (S /N) for digitally modulated signals .32
D,RF
4.7 Differential gain and phase for PAL/SECAM signals .34
4.7.1 Introduction .34
4.7.2 Differential gain (for PAL/SECAM only).34
4.7.3 Differential phase .35
4.8 Group delay measurements.38
4.8.1 Group delay variation of analogue TV signals .38
4.8.2 Procedure for the measurement of group delay variation on DVB
channel converters .39
4.9 Phase noise of an RF carrier .42
4.9.1 Introduction .42
4.9.2 Equipment required .42
4.9.3 Connection of the equipment .42
4.9.4 Measurement procedure .43
4.9.5 Presentation of the results.43
4.10 Hum modulation of carrier .44
4.10.1 Definition.44

60728-5 © IEC:2007(E) – 3 –
4.10.2 Description of the method of measurement.45
4.10.3 Measuring Procedure .46
4.10.4 Calculating the hum modulation ratio.47
4.11 2T-pulse response, K-factor .48
4.12 Chrominance-luminance delay inequalities (20T-pulse method).49
4.13 Luminance non-linearity .50
4.14 Intermodulation distortion (FM stereo radio) .51
4.14.1 Introduction .51
4.14.2 Equipment required .52
4.14.3 Connection of equipment .52
4.14.4 Measurement.52
4.15 Decoding margin (Teletext) .53
4.15.1 Definition.53
4.15.2 Method of measurement and measuring set-up (Figure 29) .53
4.15.3 Applicability of measuring set-up .53
5 Performance requirements and recommendations .54
5.1 Safety .54
5.2 Electromagnetic compatibility .54
5.3 Environmental .54
5.4 Marking .55
5.4.1 Marking of equipment .55
5.4.2 Marking of ports .55
6 Equipment characteristics required to be met .55
6.1 General .55
6.2 Power supply voltage .56
6.3 RF signal requirements .56
6.3.1 Impedance (input).56
6.3.2 Impedance (output) .56
6.3.3 Return loss (input, output) of equipment .56
6.3.4 Return loss (output) of headend .56
6.3.5 Typical back off for digital against analogue signals .57
6.3.6 Immunity against other signals in the FM radio and TV range .57
6.3.7 Carrier-to-spurious-signals ratio at output in the frequency range of
40 MHz to 862 MHz .57
6.3.8 Image rejection for AM TV and FM radio.57
6.3.9 Carrier to local oscillator signal ratio at the output for AM TV and FM
radio.58
6.3.10 Frequency stability .58
6.3.11 Phase noise of digital modulated signals at the output of the headend .59
6.3.12 In-channel group delay variation for digital modulated signals .60
6.3.13 In-channel peak-to-peak amplitude response variation for digitally
modulated signals.60
6.3.14 Stability of sound intercarrier .60
6.3.15 Stability of residual carrier amplitude.61
6.3.16 Frequency stability – SAT IF/IF converter .61
6.3.17 Typical modulation error ratio (MER) for a QAM signal .61
6.3.18 Minimum C/N values at the output of the headend .61
6.4 Composite video signal requirements .62
6.4.1 Impedance.62

– 4 – 60728-5 © IEC:2007(E)
6.4.2 Return loss .62
6.4.3 Signal voltage.62
6.4.4 Polarity.62
6.4.5 Offset voltage .62
6.5 Audio signal requirements .62
6.5.1 Input impedance .62
6.5.2 Output impedance .62
6.5.3 Signal level.63
6.6 Requirements for decoding margin (teletext) .63
6.7 IF signal requirements (AM-TV).63
6.7.1 Impedance.63
6.7.2 Return loss .63
6.8 Antennas for terrestrial reception .63
6.8.1 Impedance.
...