EN 60728-5:2016

SLOVENSKI STANDARD
01-julij-2016
1DGRPHãþD
SIST EN 60728-5:2008
Kabelska omrežja za televizijske in zvokovne signale ter interaktivne storitve - 5.
del: Oprema glavne sprejemne postaje
Cable networks for television signals, sound signals and interactive services - Part 5:
Headend equipment
Ta slovenski standard je istoveten z: EN 60728-5:2016
ICS:
33.060.40 Kabelski razdelilni sistemi Cabled distribution systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 60728-5
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2016
ICS 33.060.40 Supersedes EN 60728-5:2008
English Version
Cable networks for television signals, sound signals and
interactive services - Part 5: Headend equipment
(IEC 60728-5:2015)
Réseaux de distribution par câbles pour signaux de Kabelnetze für Fernsehsignale, Tonsignale und interaktive
télévision, signaux de radiodiffusion sonore et services Dienste - Teil 5: Geräte für Kopfstellen
interactifs - Partie 5: Équipements de tête de réseau (IEC 60728-5:2015)
(IEC 60728-5:2015)
This European Standard was approved by CENELEC on 2016-01-13. 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 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 translation
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,
Denmark, 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.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2016 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 60728-5:2016 E
European foreword
The text of document 100/2555/FDIS, future edition 3 of IEC 60728-5, 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 submitted to the IEC-CENELEC parallel vote and
approved by CENELEC as EN 60728-5:2016.

The following dates are fixed:
• latest date by which the document has to be (dop) 2016-10-22
implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2019-04-22
• latest date by which the national
standards conflicting with the
document have to be withdrawn
This document supersedes EN 60728-5:2008.

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.
Endorsement notice
The text of the International Standard IEC 60728-5:2015 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:

IEC 60050 (series) NOTE Harmonized as EN 60050 (series).
IEC 60130-9 NOTE Harmonized as EN 60130-9.
IEC 61169-2:2001 NOTE Harmonized as EN 61169-2:2001.
IEC 61169-8 NOTE Harmonized as EN 61169-8.

Annex ZA
(normative)
Normative 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
references, 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 listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60068-2-1 -  Environmental testing -- Part 2-1: Tests - EN 60068-2-1 -
Test A: Cold
IEC 60068-2-2 -  Environmental testing -- Part 2-2: Tests - EN 60068-2-2 -
Test B: Dry heat
IEC 60068-2-14 -  Environmental testing -- Part 2-14: Tests - EN 60068-2-14 -
Test N: Change of temperature
IEC 60068-2-27 -  Environmental testing -- Part 2-27: Tests - EN 60068-2-27 -
Test Ea and guidance: Shock
IEC 60068-2-30 -  Environmental testing -- Part 2-30: Tests - EN 60068-2-30 -
Test Db: Damp heat, cyclic (12 h + 12 h
cycle)
IEC 60068-2-31 -  Environmental testing -- Part 2-31: Tests - EN 60068-2-31 -
Test Ec: Rough handling shocks, primarily
for equipment-type specimens
IEC 60068-2-40 -  Basic environmental testing procedures - EN 60068-2-40 -
Part 2: Tests. Test Z/AM: Combined
cold/low air pressure tests
IEC 60244-5 -  Methods of measurement for radio EN 60244-5 -
transmitters -- Part 5: Performance
characteristics for television transmitters
IEC 60529 -  Degrees of protection provided by EN 60529 -
enclosures (IP Code)
IEC 60728-1 -  Cable networks for television signals, EN 60728-1 -
sound signals and interactive services --
Part 1: System performance of forward
paths
IEC 60728-2 -  Cable networks for television signals, EN 50083-2 -
sound signals and interactive services -
Part 2: Electromagnetic compatibility for
equipment
IEC 60728-3 2010 Cable networks for television signals, EN 60728-3 2011
sound signals and interactive services --
Part 3: Active wideband equipment for
cable networks
IEC 60728-11 -  Cable networks for television signals, EN 60728-11 -
sound signals and interactive services --
Part 11: Safety
IEC 61319-1 -  Interconnections of satellite receiving EN 61319-1 -
equipment -- Part 1: Europe
ISO/IEC 13818-1 -  Information technology - Generic coding of - -
moving pictures and associated audio
information - Part 1: Systems
ISO/IEC 13818-2 -  Information technology - Generic coding of - -
moving pictures and associated audio
information - Part 2: Video
ISO/IEC 13818-3 -  Information technology - Generic coding of - -
moving pictures and associated audio
information - Part 3: Audio
ISO/IEC 13818-4 -  Information technology - Generic coding of - -
moving pictures and associated audio
information - Part 4: Conformance testing
ETSI EN 300 421 -  Digital Video Broadcasting (DVB): Framing - -
structure, channel coding and modulation
for 11/12 GHz satellite services
ETSI EN 300 429 -  Digital Video Broadcasting (DVB): Framing - -
structure, channel coding and modulation
for cable systems
ETSI EN 300 468 -  Digital Video Broadcasting (DVB): - -
Specification for Service Information (SI) in
DVB systems
ETSI EN 300 473 -  Digital Video Broadcasting (DVB): Satellite - -
Master Antenna Television (SMATV)
distribution systems
ETSI EN 300 744 -  Digital Video Broadcasting (DVB): Framing - -
structure, channel coding and modulation
for digital terrestrial television
ETSI EN 302 307 -  Digital Video Broadcasting (DVB);Second - -
generation framing structure, channel
coding and modulation systems for
Broadcasting, Interactive Services, News
Gathering and other broadband satellite
applications (DVB-S2)
ETSI EN 302 755 -  Digital Video Broadcasting (DVB); Frame - -
structure channel coding and modulation
for a second generation digital terrestrial
television broadcasting system (DVB-T2)
ETSI ETS 300 163 -  Television systems; NICAM 728: - -
transmission of two-channel digital sound
with terrestrial television systems B, G, H,
I, K1 and L
ETSI TR 101 211 -  Digital Video Broadcasting (DVB); - -
Guidelines on implementation and usage
of Service Information (SI)
ITU-R -  Measurement of audio-frequency noise - -
Recommendation voltage level in sound broadcasting (Vol.
BS 468-4 X-1)
ITU-R Report 624-4 -  Characteristics of television systems - -
ITU-T -  Transmission performance of television - -
Recommendation circuits designed for use in international
J.61 connections
ITU-T -  Measurement methods and test - -
Recommendation procedures for teletext signals
J.101
Annex ZB
(normative)
Special national conditions
Special national condition: National characteristic or practice that cannot be changed even over a
long period, e.g. climatic conditions, electrical earthing conditions.
NOTE  If it affects harmonization, it forms part of the European Standard / Harmonization Document.
For the countries in which the relevant special national conditions apply these provisions are
normative, for other countries they are informative.
Clause Special national condition
5.3 Finland, Sweden
All equipment installed in locations that are not temperature controlled shall meet the
requirements within the temperature range -40 °C to +55 °C.

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
Réseaux de distribution par câbles pour signaux de télévision, signaux de

radiodiffusion sonore et services interactifs –

Partie 5: Équipements de tête de réseau

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.060.40 ISBN 978-2-8322-3016-9

– 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 . 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 Three-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 and f . 29
a b
4.4.3 Signal levels . 29
4.5 Carrier-to-spurious signal ratio at the output . 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 modulated signals) . 32
4.6.2 RF signal-to-noise ratio (S /N) for digitally modulated signals . 35
D,RF
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 delay 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 Presentation 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-luminance 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
4.15.2 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 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 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 signal 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 for 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 . 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 Requirements 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 General . 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 Output 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 . 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-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 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 60130-9 . 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 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 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
Annex 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 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 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 © 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 > f . 29
a b
Figure 7 – Carrier-to-spurious signal ratio at the output . 30
Figure 8 – Carrier-to spurious signal ratio at the output . 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 a split-frequency signal . 42
Figure 16 – Spectral presentation of the group delay measurement . 43
Figure 17 – Description of the measuring set-up . 44
Figure 18 – Choices of measuring aperture (value of the split frequency) for various
measurement tests . 44
Figure 19 – Test set-up for phase noise measurement . 46
Figure 20 – Mask for phase noise measurements . 47
Figure 21 – Carrier/hum ratio . 48
Figure 22 – Test set-up for equipment with built-in power supply . 49
Figure 23 – Test set-up for equipment with external power supply . 49
Figure 24 – Oscilloscope display . 50
Figure 25 – K-factor mask for quality grade 2 . 52
Figure 26 – Generation of 20T-pulse . 53
Figure 27 – Example of amplitude and delay error using 20T-pulse . 53
Figure 28 – Staircase signal for measurement of luminance non-linearity before and
after differentiation . 54
Figure 29 – Example of a possible frequency combination displayed on a spectrum
analyser . 54
Figure 30 – Arrangement of test equipment for intermodulation distortion . 55
Figure 31 – Principal measuring set-up for determination of decoding margin . 56
Figure 32 – Example of diagram of NF, C/N or S/N for equipment with AGC . 69
Figure A.1 – Test frequency range for TV channel processors . 74
Figure A.2 – Test frequency range for sub-band, full-band and multi-band amplifiers . 74
Figure A.3 – Test frequency range for an FM radio channel processor . 75
Figure B.1 – Contact allocation and mechanical dimensions . 76
Figure C.1 – Selectivity diagram for PAL B/G with mono or stereo sound . 77
Figure C.2 – Selectivity diagram for PAL B/G with NICAM 728 in the lower adjacent
channel . 78
Figure C.3 – Selectivity diagram for PAL I . 79
Figure C.4 – Group delay mask for the standards B/G, D/D1/K and I . 79
Figure C.5 – Group delay pre-correction diagram for standard B/G . 80
Figure C.6 – Selectivity diagram for SECAM L . 80
Figure C.7 – Group delay mask for SECAM L . 81

IEC 60728-5:2015 © IEC 2015 – 7 –
Figure C.8 – Selectivity diagram for PAL D/K . 81
Figure E.1 – Noise correction factor CF (dB) versus measured level difference D (dB) . 84
Figure G.1 – Frequency tolerance of converted signals in the IF range . 89
Figure H.1 – Error concerning return loss measurement . 90
Figure H.2 – Maximum ripple . 90

Table 1 – Test signal levels for the different television standards in decibels relative to
reference level . 27
Table 2 – Test signal levels in decibels relative to reference level . 28
Table 3 – Test signal levels for sound and vision carriers in decibels relative to
reference level . 30
Table 4 – Noise bandwidth . 34
Table 5 – Frequency distances for phase noise measurement . 47
Table 6 – Publications for environmental requirements of headend equipment . 57
Table 7 – Return loss (input, output) of equipment . 58
Table 8 – Return loss (output) of headend . 58
Table 9 – Typical levels of digital signals with respect to analogue signals (back-off) . 59
Table 10 – Carrier-to-spurious-signals ratio of digital modulated channel with respect
to the peak level of an analogue TV carrier . 60
Table 11 – Frequency stability for AM TV related to the nominal AM TV frequency . 60
Table 12 – Long-term frequency stability for digital modulated signals . 61
Table 13 – Shoulder attenuation for digital modulated signals . 61
Table 14 – Phase noise of a DVB signal (PSK and QAM) . 62
Table 15 – Phase noise of a DVB signal (OFDM) . 62
Table 16 – In-channel group delay variation for digital modulated signals . 62
Table 17 – In-channel peak-to-peak amplitude response variation of DVB signals . 63
Table 18 – Stability of sound intercarrier . 63
Table 19 – Stability of residual carrier amplitude . 63
Table 20 – Frequency stability – SAT IF/IF converter . 64
Table 21 – Minimum requirements for MER for different QAM modulation schemes . 64
Table 22 – C/N values for converters at the headend output . 64
Table 23 – Return loss . 65
Table 24 – Signal voltage . 65
Table 25 – Signal level . 66
Table 26 – Requirements for decoding margin (Teletext) . 66
Table 27 – Return loss – IF signal . 66
Table 28 – Return loss – Antennas for terrestrial reception . 66
Table 29 – Recommended temperature ranges . 67
Table 30 – Carrier-to-third-order intermodulation ratio for maximum output level of
channel amplifiers/frequency converters . 67
Table 31 – Carrier-to-third-order intermodulation ratio for maximum output level of
sub-band, full band, multi-band amplifiers and multi-channel frequency converters for
AM TV (not for channel amplifier) . 67
Table 32 – Carrier-to-second-order intermodulation ratio for maximum output level of
sub-band, full band, multi-band amplifiers and frequency converters for AM TV or FM
radio (not for channel amplifier) . 68

– 8 – IEC 60728-5:2015 © IEC 2015
Table 33 – Carrier-to-intermodulation ratio for maximum output level of FM-TV
channel amplifiers/frequency converters . 68
Table 34 – Carrier-to-third-order intermodulation ratio for maximum output level of FM
TV full band, sub-band amplifiers . 68
Table 35 – Output level stability for TV modulators, pilot generators and TV converters . 69
Table 36 – Recommendation for differential gain . 70
Table 37 – Recommendation for differential phase . 70
Table 38 – Recommendation for group delay variation . 70
Table 39 – Recommendation fo
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