IEC 60728-2:2018
(Main)Cable networks for television signals, sound signals and interactive services - Part 2: Electromagnetic compatibility for equipment
Cable networks for television signals, sound signals and interactive services - Part 2: Electromagnetic compatibility for equipment
IEC 60728-2:2018(E) applies to the radiation characteristics and immunity to electromagnetic disturbance of EM active equipment (active and passive equipment) for the reception, processing and distribution of television, sound and interactive multimedia signals as dealt with in IEC 60728-3, IEC 60728-4, IEC 60728-5 and IEC 60728-6.
This document covers the following frequency ranges:
- disturbance voltage injected into the mains: 150 kHz to 30 MHz;
- radiation from active equipment: 5 MHz to 25 GHz;
- immunity of active equipment: 150 kHz to 25 GHz;
- screening effectiveness of passive equipment: 5 MHz to 3,5 GHz.
This document specifies requirements for maximum allowed radiation, minimum immunity and minimum screening effectiveness and describes test methods for conformance testing.
This third edition cancels and replaces the second edition published in 2010. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) Frequency extensions:
a.1) The upper frequency limit of conventional cable network equipment was extended from 862 MHz to 1 000 MHz due to market demands.
a.2) The first intermediate frequency range (1st IF range) for satellite signal transmission was extended to cover now frequencies from 950 MHz up to 3 500 MHz.
a.3) The methods of measurement and the EMC requirements in the overlapping frequency range from 950 MHz to 1 000 MHz were allocated in relation to the upper frequency limit, 1 000 MHz, and the lower frequency limit, 950 MHz, of the relevant equipment under test.
b) New EMC environment in the 800 MHz band:
b.1) The European Commission has requested CENELEC and ETSI to draft immunity requirements for equipment, to protect against disturbance from the new wireless service in the 790 MHz to 862 MHz band.
b.2) A CENELEC/ETSI Joint Working Group “Digital Dividend” was formed to describe the new EMC environment and to advise on appropriate test methods and limits.
b.3) IEC 60728-2 is the document specifying immunity requirements for active and passive cable network equipment.
b.4) The method of measurement and the requirements for in-band immunity were extended taking into account this new EMC environment due to the allocation of broadband wireless services in the frequency band 694 MHz to 862 MHz. As a consequence, the limits of in-band immunity were specified for analogue and additionally for digital signals in this frequency range.
b.5) Consequently it is recommended, that, where cable networks and wireless networks coexist, only the transmission of digitally modulated signals should be used in the frequency range 694 MHz to 862 MHz.
b.6) For passive equipment, Class A and Class B specifications were kept in the standard but a note was added recommending that only Class A equipment should be used in the planning and implementation of new networks.
c) The methods of measurement for all kinds of indoor antennas were combined in the new 4.9.
d) A Bibliography has been added at the end of the document referencing, for example, CEPT Report 30 on “The identification of common and minimal (least restrictive) technical conditions for 790-862 MHz for the digital dividend in the European Union”.
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Standards Content (Sample)
IEC 60728-2 ®
Edition 3.0 2018-01
INTERNATIONAL
STANDARD
Cable networks for television signals, sound signals and interactive services –
Part 2: Electromagnetic compatibility for equipment
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IEC 60728-2 ®
Edition 3.0 2018-01
INTERNATIONAL
STANDARD
Cable networks for television signals, sound signals and interactive services –
Part 2: Electromagnetic compatibility for equipment
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.160.99 ISBN 978-2-8322-5148-5
– 2 – IEC 60728-2:2018 © IEC 2018
CONTENTS
CONTENTS . 2
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 10
3 Terms, definitions, symbols and abbreviated terms . 10
3.1 Terms and definitions . 10
3.2 Symbols . 16
3.3 Abbreviated terms . 17
4 Methods of measurements . 17
4.1 General operating conditions . 17
4.2 Disturbance voltages from equipment . 18
4.2.1 Disturbance voltages from equipment in the frequency range from
150 kHz to 30 MHz . 18
4.2.2 Disturbance voltages from equipment at the AC mains frequency and its
harmonics . 18
4.2.3 Measurement of input terminal disturbance voltage . 19
4.3 Radiation from active equipment. 19
4.3.1 General . 19
4.3.2 General measurement requirements . 19
4.3.3 Methods of measurements . 20
4.4 Immunity of active equipment . 29
4.4.1 General . 29
4.4.2 Performance criterion . 29
4.4.3 Measurement of the external immunity to ambient fields . 30
4.4.4 Internal immunity (immunity to unwanted signals) . 36
4.5 Screening effectiveness of passive equipment . 42
4.5.1 General . 42
4.5.2 General measurement requirements . 42
4.5.3 Methods of measurements . 42
4.6 Electrostatic discharge immunity test for active equipment . 44
4.6.1 General . 44
4.6.2 Performance criterion B (according to IEC 61000-6-1:2016) . 44
4.7 Electrical fast transient/burst immunity test for AC power ports . 44
4.8 Methods of measurement for telecom signal ports of multimedia network
equipment . 44
4.9 Measurement of indoor receiving antennas for broadcast signals . 44
4.9.1 Indoor antennas with additional RF network input port . 44
4.9.2 Indoor antennas without additional RF network input port . 45
5 Performance requirements . 45
5.1 General . 45
5.1.1 Emission performance requirements . 45
5.1.2 Immunity performance requirements . 45
5.2 Disturbance voltages from equipment . 45
5.2.1 Limits of mains terminal disturbance voltage . 45
5.2.2 Limits of input terminal disturbance voltages . 45
5.3 Radiation . 46
5.3.1 Radiation from active equipment . 46
5.3.2 Local oscillator power at the outdoor unit input . 46
5.4 Immunity of active equipment . 47
5.4.1 External immunity to electromagnetic fields . 47
5.4.2 Internal immunity . 47
5.4.3 Immunity of outdoor units to image frequency signals . 51
5.5 Screening effectiveness of passive equipment . 52
5.6 Electrostatic discharge immunity test for active equipment . 52
5.7 Electrical fast transient/burst immunity test for AC power ports . 52
5.8 Performance requirements for telecom signal ports of multimedia network
equipment . 53
5.9 Applicability of EMC performance requirements and methods of measurement
to different types of equipment . 53
Bibliography . 56
Figure 1 – Measurement set-up for radiation measurements in the frequency range
5 MHz to 30 MHz using the "coupling unit" method . 21
Figure 2 – Absorbing clamp method (30 MHz to 1 000 MHz) . 23
Figure 3 – Example of general measurement set-up . 24
Figure 4 – Example of measurement set-up for measurements on the input port of
active equipment . 25
Figure 5 – Measurement set-up for the "substitution" radiation method – First
measurement step . 27
Figure 6 – Measurement set-up for the "substitution" radiation method – Second
measurement step . 28
Figure 7 – Frequency allocation for out-of-band immunity measurement of active
equipment in the frequency range ≤ 1 000 MHz . 31
Figure 8 – Frequency allocation for out-of-band immunity measurement of active
equipment in the frequency range ≥ 950 MHz . 31
Figure 9 – Frequency allocation for in-band immunity measurement of active equipment
in the frequency range ≤ 1 000 MHz . 34
Figure 10 – Frequency allocation for in-band immunity measurement of active
equipment in the frequency range ≥ 950 MHz . 35
Figure 11 – Measurement set-up for internal immunity test . 37
Figure 12 – Levels of wanted and unwanted signals for the internal immunity of FSS
receiving outdoor units . 40
Figure 13 – Levels of wanted and unwanted signals for the internal immunity of BSS
receiving outdoor units . 41
Figure 14 – Levels of unwanted signals for the internal immunity of active equipment in
Band I (47 MHz to 68 MHz) . 48
Figure 15 – Levels of unwanted signals for the internal immunity of active equipment in
Band II (87,5 MHz to 108 MHz) . 49
Figure 16 – Levels of unwanted signals for the internal immunity of active equipment in
Band III (174 MHz to 230 MHz) . 50
Figure 17 – Levels of unwanted signals for the internal immunity of active equipment in
Band IV/V (470 MHz to 862 MHz) . 51
Table 1 – Port structure of different network equipment . 9
Table 2 – Limits of mains terminal disturbance voltage . 45
– 4 – IEC 60728-2:2018 © IEC 2018
Table 3 – Limits of input terminal disturbance voltages for equipment directly connected
to receiving antennas . 46
Table 4 – Limits of input terminal disturbance voltages for equipment directly connected
to satellite outdoor units . 46
Table 5 – Limits of radiated disturbance power . 46
Table 6 – Limit of local oscillator terminal power .
...
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