EN 50083-8:2013
(Main)Cable networks for television signals, sound signals and interactive services - Part 8: Electromagnetic compatibility for networks
Cable networks for television signals, sound signals and interactive services - Part 8: Electromagnetic compatibility for networks
1.1 General Standards of the EN 50083 and EN 60728 series deal with cable networks including equipment and associated methods of measurement for headend reception, processing and distribution of television and sound signals and for processing, interfacing and transmitting all kinds of data signals for interactive services using all applicable transmission media. These signals are typically transmitted in networks by frequency-multiplexing techniques. This includes for instance regional and local broadband cable networks, extended satellite and terrestrial television distribution systems, individual satellite and terrestrial television receiving systems, and all kinds of equipment, systems and installations used in such cable networks, distribution and receiving systems. The 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 of the customer premises equipment. The standardization work will consider coexistence with users of the RF spectrum in wired and wireless transmission systems. The standardization of any user terminals (i.e. tuners, receivers, decoders, multimedia terminals etc.) as well as of any coaxial, balanced and optical cables and accessories thereof is excluded. 1.2 Specific scope of EN 50083 8 This European Standard applies to the radiation characteristics and immunity to electromagnetic disturbance of cable networks for television signals, sound signals and interactive services and covers the frequency range 0,15 MHz to 3,5 GHz. It should be noted that measurements below 30 MHz are not generally considered useful in the context of cable networks and are difficult to perform in practice. Application of the harmonized standard EN 50529-2 provides presumption of conformance to the EMC Directive. Therefore, to fulfil the requirements of EN 50529-2, it is necessary to use cable network equipment that satisfies the requirements of EN 50083-2 regarding limits of radiation and of immunity to external fields. This European Standard specifies methods of measurement and EMC performance requirements under operating conditions (in situ) to ensure the ongoing EMC integrity of cable networks. Cable networks beyond the system outlets (e.g. the receiver lead, in simplest terms) which begin at the system outlet and end at the input to the subscriber's terminal equipment are not covered by the standard EN 50083 8. Requirements for the electromagnetic compatibility of receiver leads are laid down in EN 60966 2 4, EN 60966 2 5 and EN 60966 2 6. Cable networks and a wide range of radio services have to coexist. These include for example the emergency services, safety of life, broadcasting, aeronautical, radio navigation services and also land mobile, amateur and cellular radio services. Frequency ranges of typical safety of life services are listed in Annex B. Additional protection for certain services may be required by national regulations.
Kabelnetze für Fernsehsignale, Tonsignale und interaktive Dienste - Teil 8: Elektromagnetische Verträglichkeit von Kabelnetzen
Réseaux de distribution par câbles pour signaux de télévision, signaux de radiodiffusion sonore et services interactifs - Partie 8: Compatibilité électromagnétique des réseaux
1.1 Généralités Les normes des EN 50083 et EN 60728 traitent des réseaux de distribution par câbles, y compris les matériels et les méthodes de mesure associées pour la réception en tête de réseau, le traitement et la distribution des signaux de télévision et de radiodiffusion sonore et pour le traitement, l'interfaçage et l'émission de toutes sortes de signaux pour les services interactifs en utilisant tout support de transmission approprié. Ces signaux sont typiquement émis dans les réseaux par des techniques de multiplexage de fréquences. Cela inclut, par exemple les réseaux régionaux et locaux de distribution par câbles à large bande, les systèmes étendus de distribution de télévision satellitaire et terrestre, les systèmes individuels de réception de télévision satellitaire et terrestre, et toutes sortes de matériels, de systèmes et d’installations utilisés dans de tels réseaux de distribution par câbles, systèmes de distribution et de réception. Ces normes couvrent la partie s'étendant des antennes et/ou des entrées de la tête de réseau pour source spécifique de signal ou d'autres points d'interface d'accès au réseau, jusqu'à l'entrée de terminal de l'équipement des locaux client Ces normes prendront en considération la coexistence avec des utilisateurs du spectre RF dans des systèmes d'émission tant filaires que sans fils. Sont exclus de ces normes tous les terminaux d'usager (à savoir les syntoniseurs, les récepteurs, les décodeurs, les terminaux multimédias, etc.) ainsi que tous les câbles coaxiaux, symétriques ou à fibres optiques et leurs accessoires. 1.2 Domaine d'application spécifique de la EN 50083 8 La présente Norme européenne s’applique aux caractéristiques de rayonnement et à l’immunité aux perturbations électromagnétiques des réseaux de distribution par câbles pour les signaux de télévision, les signaux de radiodiffusion sonore et les services interactifs et couvre la bande de fréquences de 0,15 MHz à 3,5 GHz. Il convient de noter que les mesures en dessous de 30 MHz ne sont généralement pas considérées comme étant utiles dans le contexte des réseaux de distribution par câbles et sont difficiles à réaliser dans la pratique. L'application de la norme harmonisée EN 50529-2 fournit la présomption de conformité à la Directive CEM. Par conséquent, pour satisfaire aux exigences de la EN 50529-2, il est nécessaire d'utiliser un matériel de réseau de distribution par câbles qui satisfasse aux exigences de la EN 50083-2 relatives aux limites de rayonnement et d'immunité aux champs extérieurs. La présente Norme européenne spécifie les méthodes de mesure et les exigences de compatibilité électromagnétique (CEM) dans des conditions opératoires (in situ) pour assurer l'intégrité CEM en cours des réseaux de distribution par câbles. Les réseaux de distribution par câbles en aval des prises d’usager (par exemple, le cordon de raccordement, en termes plus simples) qui commencent à la prise d’usager et finissent à l'entrée de l'équipement terminal d’abonné ne sont pas couverts par la norme EN 50083-8. Les exigences relatives à la compatibilité électromagnétique des cordons de raccordement sont données dans les EN 60966-2-4, EN 60966-2-5 et EN 60966-2-6. Les réseaux de distribution par câbles et une large gamme de services radioélectriques doivent coexister. Ces services comprennent, par exemple, les services de secours, les services liés à la sécurité, les services de radiodiffusion, les services aéronautiques, les services de radionavigation et également les services mobiles terrestres, les services de radioamateurs et les services de radiocommunications cellulaires. Les gammes de fréquences des services de secours typiques sont énumérées en Annexe B. Des règlements nationaux peuvent exiger une protection complémentaire pour certains services.
Kabelska omrežja za televizijske in zvokovne signale ter interaktivne elemente - 8. del: Elektromagnetna združljivost omrežij
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-april-2014
1DGRPHãþD
SIST EN 50083-8:2003
SIST EN 50083-8:2003/A11:2009
Kabelska omrežja za televizijske in zvokovne signale ter interaktivne elemente - 8.
del: Elektromagnetna združljivost omrežij
Cable networks for television signals, sound signals and interactive services -- Part 8:
Electromagnetic compatibility for networks
Kabelnetze für Fernsehsignale, Tonsignale und interaktive Dienste -- Teil 8:
Elektromagnetische Verträglichkeit von Kabelnetzen
Réseaux de distribution par câbles pour signaux de télévision, signaux de radiodiffusion
sonore et services interactifs -- Partie 8: Compatibilité électromagnétique des réseaux
Ta slovenski standard je istoveten z: EN 50083-8:2013
ICS:
33.060.40 Kabelski razdelilni sistemi Cabled distribution systems
33.100.01 Elektromagnetna združljivost Electromagnetic compatibility
na splošno in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN 50083-8
NORME EUROPÉENNE
December 2013
EUROPÄISCHE NORM
ICS 33.060.40; 33.100.01 Supersedes EN 50083-8:2002 + A11:2008
English version
Cable networks for television signals, sound signals and interactive
services -
Part 8: Electromagnetic compatibility for networks
Réseaux de distribution par câbles pour Kabelnetze für Fernsehsignale,
signaux de télévision, signaux de Tonsignale und interaktive Dienste -
radiodiffusion sonore et services Teil 8: Elektromagnetische Verträglichkeit
interactifs - von Kabelnetzen
Partie 8: Compatibilité électromagnétique
des réseaux
This European Standard was approved by CENELEC on 2013-11-11. 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.
CENELEC
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
© 2013 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50083-8:2013 E
Contents Page
Foreword . 4
1 Scope . 5
1.1 General . 5
1.2 Specific scope of EN 50083-8 . 5
2 Normative references . 6
3 Terms, definitions, symbols and abbreviations . 6
3.1 Terms and definitions . 6
3.2 Symbols . 9
3.3 Abbreviations . 9
4 Methods of measurement . 10
4.1 Basic principles . 10
4.2 Radiation from cable networks . 10
4.2.1 General . 10
4.2.2 Field strength method . 11
4.2.3 Subcarrier measurement procedure . 12
4.2.4 GPS based leakage detection system . 13
4.3 Immunity of cable networks . 13
4.3.1 General . 13
4.3.2 Measurement procedure for interference caused by high-power local transmitter . 13
5 Performance requirements . 14
5.1 General conditions . 14
5.2 Radiation from cable networks and other sources . 14
5.2.1 General . 14
5.2.2 Measurement of the total radiation . 14
5.2.3 Measurement of narrowband radiation . 15
5.3 Immunity of cable networks . 16
Annex A (informative) A-deviations . 18
A.1 United Kingdom . 18
A.1.1 Regulation . 18
A.1.2 Principle . 18
A.1.3 Equipment . 18
A.1.4 Measurement frequencies . 18
A.1.5 Procedure . 19
A.1.6 Expression of results . 19
A.1.7 Permitted limits . 20
A.1.8 Interpretation . 20
A.1.9 Bibliography of A.1 . 22
A.2 United Kingdom . 22
A.2.1 Regulation . 22
A.2.2 Principle . 22
A.2.3 Equipment . 22
A.2.4 Measurement frequencies . 22
A.2.5 Procedure . 23
A.2.6 Permitted limits . 23
A.2.7 Interpretation . 24
A.2.8 Bibliography of A.2 . 24
A.3 Finland . 25
A.4 Germany . 25
– 3 – EN 50083-8:2013
Annex B (informative) Frequency ranges of typical safety of life services . 28
Annex C (informative) Interdependence between the maximum allowable field strength and the
minimum signal level at system outlet. 29
Annex D (informative) Measurements in other distances than the standard distance of 3 m . 31
D.1 Measurement at a reduced distance below 3 m . 31
D.2 Measurement at measurement distances above 3 m . 31
Annex E (informative) GPS based leakage detection system for cable networks . 32
E.1 General . 32
E.2 Automated data collection by driving through the HFC network . 32
E.3 Tagging of the signal . 32
E.4 Post processing the collected data and visualisation of leakages . 32
E.5 On site location of the leak . 32
Bibliography . 33
Figure A.1 – Arrangement of test equipment for the measurement of radiation from complete
systems . 20
Table 1 – Limits of total radiation . 15
Table 2 – Narrowband radiation limits . 15
Table 3 – Maximum expected field strength . 16
Table 4 – Required carrier-to-interference ratio . 17
Table A.1 – Radiation from complete systems: maximum permitted field strengths . 21
Table A.2 – Distance correction factor . 22
Table A.3 – Radiation from complete systems: maximum permitted field strengths . 24
Table A.4 – Distance correction factor . 24
Table A.5 – Protection of particular frequency ranges according to § 3 of the Order . 25
Table A.6 – Field strength limit values at 3 m distance from line-bound telecommunications
facilities and networks . 27
Table B.1 – Frequency ranges of typical safety of life services . 28
Foreword
This document (EN 50083-8:2013) has been prepared by CLC/TC 209 "Cable networks for television signals,
sound signals and interactive services".
The following dates are fixed:
• latest date by which this document has (dop) 2014-11-08
to be implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2016-11-08
• latest date by which the national
standards conflicting with this
document have to be withdrawn
This document supersedes EN 50083-8:2002 + A11:2008.
EN 50083-8/A11:2008.
EN 50083-8 with its methods of measurement and EMC performance requirements is explicitly dedicated
to “under operating conditions (in situ)” to ensure the ongoing EMC integrity of cable networks.
The harmonized standard EN 50529-2 is dedicated for the provision of presumption of conformance to
the EMC Directive.
st
The first intermediate frequency range (1 IF range) for satellite signal transmission was extended to
cover now frequencies from 950 MHz up to 3 500 MHz.
The method of measurement and the requirements for in-band immunity were extended taking into
account the new EMC environment due to the allocation of broadband wireless services in the frequency
band 790 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.
The substitution method of measurement (power method) was deleted.
EMC measurements below 30 MHz were deleted
New Annex D “Measurement in other distances than the standard distance of 3 m”
New Annex E “GPS based leakage detection system for cable networks”
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.
– 5 – EN 50083-8:2013
1 Scope
1.1 General
Standards of the EN 50083 and EN 60728 series deal with cable networks including equipment and
associated methods of measurement for headend reception, processing and distribution of television and
sound signals and for processing, interfacing and transmitting all kinds of data signals for interactive services
using all applicable transmission media. These signals are typically transmitted in networks by frequency-
multiplexing techniques.
This includes for instance
regional and local broadband cable networks,
extended satellite and terrestrial television distribution systems,
individual satellite and terrestrial television receiving systems,
and all kinds of equipment, systems and installations used in such cable networks, distribution and receiving
systems.
The 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 of the customer premises equipment.
The standardization work will consider coexistence with users of the RF spectrum in wired and wireless
transmission systems.
The standardization of any user terminals (i.e. tuners, receivers, decoders, multimedia terminals etc.) as well
as of any coaxial, balanced and optical cables and accessories thereof is excluded.
1.2 Specific scope of EN 50083-8
This European Standard applies to the radiation characteristics and immunity to electromagnetic disturbance
of cable networks for television signals, sound signals and interactive services and covers the frequency
range 0,15 MHz to 3,5 GHz. It should be noted that measurements below 30 MHz are not generally
considered useful in the context of cable networks and are difficult to perform in practice.
Application of the harmonized standard EN 50529-2 provides presumption of conformance to the EMC
Directive. Therefore, to fulfil the requirements of EN 50529-2, it is necessary to use cable network equipment
that satisfies the requirements of EN 50083-2 regarding limits of radiation and of immunity to external fields.
This European Standard specifies methods of measurement and EMC performance requirements under
operating conditions (in situ) to ensure the ongoing EMC integrity of cable networks.
Cable networks beyond the system outlets (e.g. the receiver lead, in simplest terms) which begin at the
system outlet and end at the input to the subscriber's terminal equipment are not covered by the standard
EN 50083-8. Requirements for the electromagnetic compatibility of receiver leads are laid down in
EN 60966-2-4, EN 60966-2-5 and EN 60966-2-6.
Cable networks and a wide range of radio services have to coexist. These include for example the emergency
services, safety of life, broadcasting, aeronautical, radio navigation services and also land mobile, amateur
and cellular radio services. Frequency ranges of typical safety of life services are listed in Annex B. Additional
protection for certain services may be required by national regulations.
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 document (including any amendments) applies.
EN 50083 (all parts), Cable networks for television signals, sound signals and interactive services
EN 50083-2, Cable networks for television signals, sound signals and interactive services – Part 2:
Electromagnetic compatibility for equipment
EN 50117 (all parts), Coaxial cables
EN 50529-2, EMC Network Standard – Part 2: Wire-line telecommunications networks using coaxial cables
EN 55016-1-1, Specification for radio disturbance and immunity measuring apparatus and methods – Part 1-1:
Radio disturbance and immunity measuring apparatus – Measuring apparatus (CISPR 16-1-1)
EN 55016-1-4, Specification for radio disturbance and immunity measuring apparatus and methods – Part 1-4:
Radio disturbance and immunity measuring apparatus – Antennas and test sites for radiated disturbance
measurements (CISPR 16-1-4)
EN 60728 (all parts), Cable networks for television signals, sound signals and interactive services (IEC 60728,
all parts)
EN 60728-1, Cable networks for television signals, sound signals and interactive services – Part 1: System
performance of forward paths (IEC 60728-1)
IEC 60050-161, International Electrotechnical Vocabulary – Chapter 161: Electromagnetic compatibility
3 Terms, definitions, symbols and abbreviations
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-161 and the following apply.
NOTE The most important definitions of IEC 60050-161 are repeated hereafter with the IEV-numbering given in
brackets. In addition, some more specific definitions, used in this European Standard, are listed.
3.1.1
building penetration loss
ability of buildings, in which networks for distribution of television and sound are located, to attenuate the
influence of electromagnetic fields from outside the buildings or to suppress the radiation of electromagnetic
fields from inside the buildings
3.1.2
carrier-to-interference ratio
minimum level difference measured at the output of an active equipment or at any other interface within the
network between the wanted signal and
intermodulation products of the wanted signal and/or unwanted signals generated due to non-linearities,
harmonics generated by an unwanted signal,
unwanted signals that have penetrated into the operating frequency range,
unwanted signals that have been converted to the frequency range to be protected (operating frequency
range)
– 7 – EN 50083-8:2013
3.1.3
degradation (of performance)
undesired departure in the operational performance of any device, equipment or system from its intended
performance
Note 1 to entry: The term "degradation" can apply to temporary or permanent failure.
[SOURCE: IEV 161-01-19]
3.1.4
disturbance level
level of an electromagnetic disturbance at a given location, which results from all contributing (interference)
sources
3.1.5
electromagnetic disturbance
any electromagnetic phenomenon which may degrade the performance of a device, equipment or system, or
adversely affect living or inert matter
Note 1 to entry: An electromagnetic disturbance may be an electromagnetic noise, an unwanted signal or a change
in the propagation medium itself.
[SOURCE: IEV 161-01-05]
3.1.6
electromagnetic interference
EMI
degradation of the performance of an equipment, transmission channel or system caused by an
electromagnetic disturbance
Note 1 to entry: In French, the terms "perturbation électromagnétique" and "brouillage électromagnétique" designate
respectively the cause and the effect, and should not be used indiscriminately.
Note 2 to entry: In English, the terms "electromagnetic disturbance" and "electromagnetic interference" designate
respectively the cause and the effect, but they are often used indiscriminately.
[SOURCE: IEV 161-01-06]
3.1.7
(electromagnetic) radiation
1. phenomenon by which energy in the form of electromagnetic waves emanates from a source into space
2. energy transferred through space in the form of electromagnetic waves
Note 1 to entry: By extension, the term "electromagnetic radiation" sometimes also covers induction phenomena.
[SOURCE: IEV 161-01-10]
3.1.8
external immunity
ability of a device, equipment or network to perform without degradation in the presence of electromagnetic
disturbances entering other than via its normal input terminals or antenna
[SOURCE: IEV 161-03-07]
3.1.9
headend
equipment that is connected between receiving antennas or other signal sources and the remainder of the
cable network, to process the signals to be distributed
Note 1 to entry: The headend can, for example, comprise antenna amplifiers, frequency converters, combiners,
separators and generators.
3.1.10
ignition noise
unwanted emission of electromagnetic energy, predominantly impulsive in content, arising from the ignition
system within a vehicle or device
3.1.11
immunity (to a disturbance)
ability of a device, equipment or system to perform without degradation in the presence of an electromagnetic
disturbance
[SOURCE: IEV 161-01-20]
3.1.12
internal immunity
ability of a device, equipment or system to perform without degradation in the presence of electromagnetic
disturbances appearing at its normal input terminals or antennas
[SOURCE: IEV 161-03-06]
3.1.13
operating frequency range
passband for the wanted signals for which the equipment has been designed
3.1.14
receiver lead
lead that connects the system outlet to the subscriber's equipment
3.1.15
screening effectiveness
ability of an equipment or system to attenuate the influence of electromagnetic fields from outside the
equipment or system or to suppress the radiation of electromagnetic fields from inside the equipment or
system
3.1.16
spur network
cable network normally laid out inside buildings to which splitters, subscriber's taps or looped system outlets
are connected
3.1.17
subscriber's feeder
feeder connecting a subscriber's tap to a system outlet or, where the latter is not used, directly to the
subscriber's equipment
Note 1 to entry: A subscriber's feeder can include filters and balun transformer.
3.1.18
system outlet
device for interconnecting a subscriber's feeder and a receiver lead
– 9 – EN 50083-8:2013
3.1.19
well-screened test set-up
test set-up whose radiation level, when terminated with a matched load, is at least 20 dB below the expected
radiation level of the equipment under test, the test set-up and the equipment being supplied with the same
input signal level
3.2 Symbols
For the purposes of this document, the following graphical symbols apply.
NOTE These graphical symbols are used in the figures of this European Standard. These symbols are either listed in
IEC 60617 or based on symbols defined in IEC 60617.
Graphical symbol Reference number Graphical symbol Reference number
and title and title
IEC 60617 (S01249) +
IEC 60617 (S01239)
IEC 60617 (S00081)
Pre-amplifier
Tuneable bandpass filter
Level meter
3.3 Abbreviations
For the purposes of this document, the following abbreviations apply.
AM Amplitude Modulation
DSC Distress, Safety and Calling
DVB Digital Video Broadcasting
EMC Electromagnetic Compatibility
EMI Electromagnetic Interference
EPIRB Emergency Position Indicating Radiobeacons
FM Frequency Modulation
GPS Global Positioning System
HFC Hybrid Fibre Coax
IEV International Electrotechnical Vocabulary
ILS Instrument Landing System
LAS Leakage Analysis Software
MIL Military (use)
NAV (Aeronautical) Navigation (Radio)
QAM Quadrature Amplitude Modulation
QPSK Quadrature Phase Shift Keying
RF Radio Frequency
SAT-IF Satellite Intermediate Frequency
TV Television
VOR VHF Omnidirectional Range
VSB Vestigial Side Band
NOTE Only the abbreviations used in the English version of this part of EN 50083 are mentioned in this subclause.
The German and the French versions of this part can use other abbreviations. Refer to 3.3 of each language versions for
details.
4 Methods of measurement
4.1 Basic principles
These methods of measurement describe the procedures for the testing of cable networks. The purpose of the
measurements is to determine:
the level of radiation generated by cable networks and
the immunity of cable networks to external field strengths (e.g. those radiated by other
radiocommunication services and RF applications).
The measurements cover the essential parameters and environmental conditions in order to assess cases of
electromagnetic incompatibility between cable networks and other electrical or electronic equipment,
networks, installations or other cabled networks with respect to the intended operation of such cable networks.
During the test the cable network shall operate within its normal operating conditions e.g. with regard to the
signal level and signal quality at the system outlets.
NOTE Methods of measurement for radiated digitally modulated signals are under consideration. For digital egress
measurements, where the level of emission is such that the signal is indeterminate from the general and other background
noise, an analogue substitution method is employed, by using an analogue video carrier where possible.
4.2 Radiation from cable networks
4.2.1 General
The methods described hereafter are applicable to the measurement of radiation from cable networks
(combination of cables and equipment). The termination point of the cable network to be measured is the
system outlet.
– 11 – EN 50083-8:2013
When testing cable networks the terminal equipment may initially be connected. Testing of the cable networks
against the relevant limits requires the terminal equipment to be disconnected. Where limits are exceeded,
individual sections of the network (e.g. headend, satellite receiving outdoor unit, cable network, distribution
installation) may be tested in succession to determine which section of the network does not operate within
the limits.
The number of test frequencies shall be selected to give a realistic representation of the radiation pattern
throughout the operating frequency range and to enable the maximum level of radiation to be recorded and
the results interpreted accurately.
The field strength measurement procedure is used in order to achieve results which are sufficiently accurate
and do not require excessive technical effort.
The maximum permitted radiation level is given in Table 1.
4.2.2 Field strength method
4.2.2.1 Used antenna
The field strength method uses a suitable electromagnetic field antenna in the frequency range 30 MHz to
3,5 GHz which is conventionally calibrated in terms of "equivalent electric component" of the electromagnetic
field.
4.2.2.2 Equipment required to measure the electric field in the frequency range 30 MHz to 3,5 GHz
For the measurement of the radiation from a network, a calibrated measurement system comprising a radio
disturbance measuring receiver with broadband dipole, or a log-periodic antenna with tripod to measure the
electric field component, as specified in EN 55016-1-1 and EN 55016-1-4, are required.
NOTE Measuring results, received by the use of the described calibrated measuring system do not need a further
correction due to near field condition while measuring.
This European Standard defines radiation levels in terms of field strength at 3 m distance from a radiating
object. The standard distance is 3 m outside a building. In special cases (e.g. block of flats) one can choose a
different measurement distance taken into account Formula (D.1).
In the frequency range 30 MHz to 3,5 GHz a measurement bandwidth of 120 kHz and the quasi-peak detector
shall be selected. In the frequency range 1 000 MHz to 3 000 MHz a measurement bandwidth of 1 MHz and
the peak detector shall be selected. The measurement bandwidths and the relevant detector types are defined
in EN 55016-1-1.
4.2.2.3 Measuring procedure to measure the electric field in the frequency range 30 MHz to 3,5 GHz
It will be necessary to ensure that the cable network is operating with its normal signal levels.
To reduce the measurement time, the frequency range is normally scanned using the peak detector. The
maximum disturbance field strength values identified should then be re-measured using the quasi-peak
detector.
In the case of a broadband dipole, the measurement distance d is equal to the distance between the BALUN
and the telecommunications network and in the case of a log-periodic antenna equal to the distance between
the telecommunications network and the reference point of the antenna.
At the specified measuring point, the direction, height and polarisation (horizontal and vertical) of the
measuring antenna shall be varied in order to measure the maximum disturbance field strength.
NOTE 1 The actual variation of antenna parameters, particularly the antenna height, depends on the frequency to be
measured. Where the size of the calibrated measuring antenna is not practical, the use of a calibrated loop antenna is
useful.
The measurement result is to be observed for up to approximately 15 s. The relevant result is the maximum
sustained value. Individual peaks are to be ignored.
If the measurement system used delivers only measurement results as RF-voltage levels, than the
disturbance field strength level is determined by converting the RF-voltage level using Formula (1):
E = u + a + k (1)
dist l c a
where
E is the calculated disturbance field strength level in dB(µV/m);
dist
u is the measured voltage level in dB(µV) at the antenna input of the measuring receiver (50 Ω);
l
a is the attenuation of the measuring cable in dB;
c
k is the antenna factor due to the specification of the manufacturer or the calibration of the
a
measuring antenna in dB.
NOTE 2 Independent of the actual measurement distance used in any case for the calculation of the disturbance field
strength level the antenna factor (free space, due to the specification of the manufacturer or the calibrations) will be taken
into account.
4.2.3 Subcarrier measurement procedure
4.2.3.1 General
The analogue subcarrier procedure is used, when a direct measurement of radiation through broadband
digital signals is not possible (e.g. when searching leaks or determination of summation of radiated field
strength). This is due to a sensitivity decrease at the measurement receiver input resulting from a decrease in
the signal-to-noise ratio in case of broadband disturbers. The necessary increase of the measuring dynamics
can be achieved by narrow-band subcarriers.
4.2.3.2 Emission level and adjustments
For the evaluation of radiated disturbances of broadband digital signals using the subcarrier method first, the
respective power levels shall be determined. First, the level of the wanted broadband digital signal at the
feeding point for the subcarrier shall be established using the appropriate bandwidth (see Table 1). It is
recommended to use the appropriate detector for each relevant frequency range (i.e. quasi-peak detector
below 1 GHz, peak detector above 1 GHz).
Subsequently, it is to be examined whether a subcarrier is already present or other narrow-band reference
signals can be used as subcarriers. Otherwise, an unmodulated sinusoid subcarrier, if possible fed into the
gap between the digital signals, is used. This subcarrier is applied so that the level of this signal, measured
with a measuring bandwidth of 200 Hz, corresponds to the measured value of the digital signal measured
before.
NOTE If necessary, the subcarrier can be fed with an increased level compared to the wanted level of the digital
signal. It is important to appropriately take the system restrictions into account. With the following determination of the
disturbance field strength of the subcarrier, the received measured value is to be corrected accordingly.
In any case, the application of subcarriers should be co-ordinated with the respective local network operator.
– 13 – EN 50083-8:2013
4.2.3.3 Determination of disturbing field strength
When the levels of subcarriers and broadband digital signals were adjusted according to 4.2.3.2, the results of
the subcarrier measurements at the relevant measuring points provide the dominant electrical field strength
either directly or indirectly as conducted voltage at the antenna input of the measurement receiver.
If the subcarrier is fed into the relevant cable network with a higher level compared to the digital wanted signal
this level difference shall be subtracted from the received measured values accordingly. The result gives the
disturbance field strength levels at the measuring point, together with the wanted signal transmission. The
general approach to determine the field strengths as described in 4.2.2.1 and 4.2.2.3 remains untouched and
is applied accordingly.
4.2.4 GPS based leakage detection system
To get a first and quick survey upon possible leakages of cable networks, GPS based leakage detection
systems could be used. There are systems from different vendors available which all work in a similar manner.
Annex E gives a short introduction to the principle function of such detection systems.
4.3 Immunity of cable networks
4.3.1 General
The carrier-to-interference ratio caused by an external field at any system outlet shall be measured by means
of a suitable measuring receiver or spectrum analyser. The results shall meet the limits given in 5.3.
4.3.2 Measurement procedure for interference caused by high-power local outdoor transmitter
In the case of disturbance, the carrier-to-interference ratio shall be measured at the outlets subject to
disturbance.
At first, the wanted signal level in the disturbed channel shall be measured. After that, the cable network shall
be disconnected from the interchange point or the antennas as well as at the system outlet. The open
interfaces shall be terminated with 75 Ω terminating loads.
The disturbance level of the ingress unwanted signal is then measured by means of a measuring receiver in
the peak mode, taking into account the bandwidth of the wanted signal. Care shall be taken to ensure that the
measuring receiver is well-matched to the network under test and that the relevant return loss is taken into
consideration.
The difference between the wanted signal level and the level of the interfering unwanted signal level shall
meet the RF carrier-to-interference ratio specified in Table 4.
If the carrier-to-interference ratio is equal to or greater than the nominal value, the network meets the
requirements. If the carrier-to-interference ratio is less than the required ratio, further studies are necessary.
All distribution installations beyond the system outlet (receiver leads, receiver, other subscriber's installations)
shall be disconnected from the network under test for the purposes of these studies. In the majority of cases
disturbance is caused by these items. The measurement of the disturbance level shall be repeated. After the
measurement, the normal operating condition of the network shall subsequently be restored.
If all these provisions do not lead to a better carrier-to-interference ratio, it shall be assumed that the
interfering signals intrude into the cable network. Then the interfering field strength outside the building shall
be measured in the vicinity of the assumed point of penetration. The maximum field strength shall be
determined by changing the site of the antenna. The field strength limit at which the carrier-to-interference
ratios according to Table 4 shall be met is indicated in Table 3.
If the interfering field strength is equal to or lower than this value, the network does not meet the requirements.
If the measured interfering field strength exceeds this value then this problem should be referred to the
national regulatory authorities.
5 Performance requirements
5.1 General conditions
The relevant conditions in the sense of good engineering practice applicable to cable networks to meet the
values specified in 5.2 and 5.3 are as follows:
professional planning;
compliance with the requirements of the EN 50083 series, EN 60728 series and EN 50117 series;
use of suitable equipment, components (plugs, connectors etc.) and coaxial cables fulfilling these
standards or use of such equipment which can be deemed suitable on the basis of the details of the
technical data sheets;
correct installation of all parts of network equipment including the provision of appropriate connections
between cables, plugs and equipment. Therefore, only suitable connections for plugs and clamps shall be
used. The installation instructions of the manufacturer of the equipment and components shall be
considered.
Furthermore, to allow presumption of conformance to the EMC Directive, wire-line telecommunications
networks using coaxial cables shall comply with the requirements of EN 50529-2. Therefore, to fulfil these
requirements, cable network equipment shall comply with the requirements of EN 50083-2 regarding limits of
radiation and of immunity to external fields.
5.2 Radiation from cable networks and other sources
5.2.1 General
Cable networks are operated in a general EMC environment that may be influenced by a large number of
equipment and systems the EMC behaviour of which is described in different harmonized product standards
(e.g. EN 55013, EN 55022, …). Therefore, it might be difficult or even impossible to distinguish between the
different sources of disturbances.
The maximum permitted radiation levels, given in Table 1, shall apply according to the method of
measurement specified in 4.2. In addition, National regulations for the protection of specific services may
apply and replace values in Table 1 and Table 2. Reference is made to Annex A.
5.2.2 Measurement of the total radiation
For the measurement of the radiation (caused by a cable network and/or all other possible disturbance
sources) the total radiation level is measured with a receiver having a quasi-peak detector respectively a peak
detector and measuring bandwidths as stated in Table 1 (according to EN 55016-1-1 and EN 55016-1-4).
– 15 – EN 50083-8:2013
Table 1 – Limits of total radiation
Frequency range Field strength limits Measuring Measuring detector
at 3 m distance bandwidth
MHz dB(µV/m) kHz
a
30 to 1 000 40 120 Quasi-peak
b
950 to 2 500 50 1 000 Peak
2 500 to 3 500 64 1 000 Peak
a
Applicable for cable networks with an upper frequency limit of up to 1 000 MHz
b
Applicable for cable networks with a lower frequency limit of 950 MHz (SAT-IF distribution network)
5.2.3 Measurement of narrowband radiation
If during the measurement of the total radiation according to 5.2.2 a significant contribution of single carrier
disturbance is observed, the measurements shall be repeated and the radiation limits according to Table 2
shall apply.
Table 2 – Narrowband radiation limits
Frequency range Field strength limits Measuring Measuring detector
at 3 m distance bandwidth
MHz dB(µV/m) kHz
a
30 to 1 000 27 120 Quasi-peak
b
950 to 2 500 50 1 000 Peak
2 500 to 3 500 64 1 000 Peak
a
Applicable for cable networks with an upper frequency limit of 1 000 MHz
b
Applicable for cable networks with a lower frequency limit of 950 MHz (SAT-IF distribution network)
For single carrier measurements, also other receivers can be used.
To determine the radiation disturbance power of a cable network apply the following calculation using
Formula (2).
p =u - a - a - c + G + 4 dB (2)
U S S c r D
where
p is the calculated radiated disturbance power level in dB(pW);
U
u is the voltage level at the signal generator output in dB(µV) at 50 Ω;
S
a is the attenuation of the att
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