prEN 50471

SLOVENSKI oSIST prEN 50471:2005

PREDSTANDARD
september 2005
Elektromagnetna združljivost (EMC) – Standard oddajanja motenj za skupino
izdelkov za žična telekomunikacijska omrežja
Electromagnetic compatibility (EMC) – Product family emission standard for wire-
line telecommunication networks
ICS 33.100.01 Referenčna številka
oSIST prEN 50471:2005(en)
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

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DRAFT
EUROPEAN STANDARD prEN 50471
NORME EUROPÉENNE
EUROPÄISCHE NORM June 2005

ICS


English version


Electromagnetic compatibility (EMC) - Product family emission standard
for wire-line telecommunication networks




This draft European Standard is submitted to CENELEC members for CENELEC enquiry.
Deadline for CENELEC: 2005-12-16

It has been drawn up by CENELEC/ETSI JWG on EMC.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CENELEC 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 Central Secretariat has the same status as the official
versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden,
Switzerland and United Kingdom.

Warning : This document is not a European Standard. It is distributed for review and comments. It is
subject to change without notice and shall not be referred to as a European Standard.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels


© 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Project: 16912 Ref. No. prEN 50471:2005 E
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prEN 50471:2005 – 2 –
Foreword
This European standard has been prepared by a Joint Working Group between CENELEC and
ETSI on EMC of conducted transmission networks. It is submitted to the CENELEC enquiry.
This version constitutes the first edition of this standard.
CS note 1: This document has been prepared by the CENELEC/ETSI JWG on EMC of
Conducted Transmission Networks and is intended to become the main deliverable under EC
Mandate M/313. In order to ensure due consensus from the stakeholders of both CENELEC
and ETSI, the document is circulated to a simultaneous public enquiry in both organizations.
With a message dated 26 May 2005 to the CENELEC President, the ETSI Director General
has confirmed that the subsequent vote and publication of the document will be assigned to
CENELEC.

CS note 2: Crossreferences to CISPR 16-1 should be checked before voting as
CISPR 16-1:1999 has been superseded by CISPR 16-1-X series and replaced by the
corresponding EN 55016-1-X.
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Contents

Introduction.5
1 Scope and Object .5
2 Normative references .5
3 Definitions and abbreviations.6
3.1 Definitions .6
3.2 Abbreviations .7
4 Assessment procedure for telecommunication networks .7
4.1 Network requirements .8
4.1.1 Applicability .8
4.1.2 Limits below 30 MHz.8
4.1.3 Limits above 30 MHz .8
5 Disturbance emission measurement methods .9
5.1 General arrangements.9
5.2 Conducted measurements below 30 MHz .9
5.3 Radiated measurements above 30 MHz.9
6 Processing of obtained measuring results.11
6.1 Normalisation of measured field strengths to the reference measurement
distance for measurements made in accordance with 5.2 to 5.3 .11
6.1.1 Graphical method .11
6.1.2 Calculation method.11
6.2 Correction of measurement results due to near field conditions .12
6.3 Treatment of measurement uncertainty .12
6.3.1 Definitions and symbols.12
6.3.1.1 General symbols .12
6.3.1.2 Measurands .12
6.3.1.3 Input quantities .12
6.3.2 Measurement instrumentation uncertainty.13
6.3.2.1 Quantities to be considered for radiated disturbance
measurements of electric field strength .13
6.3.2.2 Quantities to be considered for conducted disturbance
measurements of common mode current.15
7 Network measurement procedure .16
7.1 Measurements on real operating networks .16
7.2 Measurements on representative networks.16
Annex A (informative) Examples of EMC product standards that include network
emission requirements .17
Figure 1 - Diagram showing alignment of definitions to a typical
wire-line telecommunications network .7
Figure 3 - Antenna height variation .10

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Table 1 – Limits of conducted common-mode (asymmetric mode) disturbances on wire-line
telecommunications network cables .8
Table 2 – Limits of radiated disturbances from wire-line telecommunications
networks above 30 MHz.8
Table 3 − Radiated disturbances from 30 MHz to 200 MHz using a biconical antenna
at a distance of 3 m, 10 m, or 30 m.14
Table 4 − Radiated disturbances from 200 MHz to 1 GHz using a log-periodic antenna
at a distance of 3 m, 10 m, or 30 m.15
Table 5 − Disturbance measurement of common mode current from 150kHz to 30 MHz.16


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Introduction
This EMC standard specifies limits and methods of measurement for disturbance emissions
emanating from wire-line telecommunication networks. These limits and methods of
measurement address disturbance emissions occurring in and along wire-line
telecommunication networks under normal operation conditions.
1 Scope and Object
This EMC standard specifies limits and methods of measurement for disturbance emissions
emanating from wire-line telecommunication networks as defined in Clause 3, including their
in-house extensions, installed and operated as intended.
This standard covers the frequency range 9 kHz to 400 GHz. To date, it specifies limits and
methods of measurement for conducted and radiated disturbances from telecommunication
networks in the frequency range 150 kHz to 1 GHz. The assessment of a network needs to be
performed only in the frequency ranges where limits are defined.
The limits set in this standard do not apply to wanted emissions from radio transmitters.
The emission requirements have been selected so as to ensure that disturbances generated
by a network, or parts thereof, operating normally do not exceed a level that could prevent
other apparatus from operating as intended. Fault conditions of the network are not taken into
account. Not all disturbance phenomena have been included for testing purposes in this
standard but only those considered as relevant for the network covered by this standard.
These test requirements represent essential electromagnetic compatibility emission
requirements.
NOTE  In special cases, situations will arise where the levels specified in this standard will not offer adequate
protection; for example where a sensitive receiver is used in close proximity to a network. In these instances,
special mitigation measures may have to be employed.

2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
EN 50083-2, Cable networks for television signals, sound signals and interactive services –
Part 2: Electromagnetic compatibility for equipment
EN 55013, Sound and television broadcast receivers and associated equipment - Radio disturbance
characteristics - Limits and methods of measurement (CISPR 13, mod.)
EN 55022, Information technology equipment – Radio disturbance characteristics – Limits and
methods of measurement (CISPR 22, mod.)
EN 300 386, Electromagnetic compatibility and Radio spectrum Matters (ERM);
Telecommunication network equipment; ElectroMagnetic Compatibility (EMC) requirements
TR 101 651, Electromagnetic compatibility and Radio spectrum Matters (ERM) –
Classification of the electromagnetic environment conditions for equipment in
telecommunication networks
EN 301489-1, Electromagnetic compatibility and Radio spectrum Matters (ERM);
Electromagnetic Compatibility (EMC) standard for radio equipment and services – Part1:
common technical requirements
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prEN 50471:2005 – 6 –
EN 55016-1 series, Specification for radio disturbance and immunity measuring apparatus
and methods – Part 1: Radio disturbance and immunity measuring apparatus
(CISPR 16-1 series)
EN 55016-2 series, Specification for radio disturbance and immunity measuring apparatus
and methods - Part 2: Methods of measurement of disturbances and immunity
(CISPR 16-2 series)
EN 55016-4-2:2004, Specification for radio disturbance and immunity measuring apparatus
and methods - Uncertainties, statistics and limit modelling - Uncertainty in EMC
measurements (CISPR 16-4-2)
IEC 60050-161, International Electrotechnical Vocabulary (IEV) – Chapter 161:
Electromagnetic compatibility

3 Definitions and abbreviations
3.1 Definitions
For the purpose of this standard the following definitions apply.
disturbance field strength
field strength produced at a given location by an electromagnetic disturbance, measured
under specified conditions
[(IEC – IEV 161-04-02]
electromagnetic disturbance
any electromagnetic phenomenon that may degrade the performance of a device, equipment
or system, or adversely affect living or inert matter
[IEC – IEV 161-01-05]
emission
The phenomenon by which electromagnetic energy emanates from a source
[IEC – IEV 161-01-08]
radio (frequency) disturbance
electromagnetic disturbance having components within the radio frequency range
[IEC – IEV 161-01-13]
measurement distance
the measurement distance is taken as a straight line rectangular from the telecommunication
cable tract (or its projection to the floor level), from the boundary of the premises, office, or
flat, or from the exterior wall of the building hosting the network concerned, to the measuring
antenna reference point. This reference point can be:
- the centre of the coil of a loop antenna used for measurements of the magnetic
component of electromagnetic fields; or
- the balun, in case of a broadband dipole, or the reference point of a logarithmic-
periodical or horn antenna referred to for calibration purposes.
wire-line telecommunication network
a combination of equipment and passive devices (network cables, connectors) interconnected
together (see Figure 1) to constitute the wire-line part of an electronic communications
network
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electronic communications network
means transmission systems and, where applicable, switching or routing equipment and other
resources which permit the conveyance of signals by wire, by radio, by optical or by other
electromagnetic means, including satellite networks, fixed (circuit- and packet-switched,
including Internet) and mobile terrestrial networks, electricity cable systems, to the extent that
they are used for the purpose of transmitting signals, networks used for radio and television
broadcasting, and cable TV networks, irrespective of the type of information conveyed
network cable
the cable infrastructure (transmission line) used to connect together telecom installations,
systems and telecom terminal equipment. The network cable may also include in-premises
extension cables

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Figure 1 - Diagram showing alignment of definitions to
a typical wire-line telecommunications network
3.2 Abbreviations

CENELEC European Committee for Electrotechnical Standardisation
CISPR International Special Committee on Radio Interference
EMC Electromagnetic Compatibility
ETSI European Telecommunications Standards Institute
IEC International Electrotechnical Committee
IEV International Electrotechnical Vocabulary
ITE Information Technology Equipment
NTP Network Termination Point
TTE Telecom Terminal Equipment
TV Television
4 Assessment procedure for telecommunication networks
The whole or part of the telecommunication network is deemed to be compliant to the present
standard:
• If all equipment directly connected to the network or part thereof meets the emission
requirements defined in the applicable EMC product standard (see Annex A) taking
the properties of the network cable type into account;
or
• If the network meets the requirements specified in 4.1.
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prEN 50471:2005 – 8 –
4.1 Network requirements
4.1.1 Applicability
Emission measurements shall either be performed on real operating networks installed in the
field or on a representative reference network. The assessment can be made either on a
complete network or over a given part of it.
Measurements are not required within equipment enclosures, in telecommunication centres or
in industrial areas.
4.1.2 Limits below 30 MHz
The telecommunication network shall meet the limits specified in Table 1 according to the
measurement method specified in 5.2 and using the measurement procedure defined in
Clause 7.
Table 1 – Limits of conducted common-mode (asymmetric mode) disturbances on wire-line
telecommunications network cables
Frequency range Current limits Measurement
bandwidth
MHz dB(µA)
Quasi-peak Average
1 1
0,15 to 0,5 9 kHz
40 to 30  30 to 20
0,5 to 30 30 20 9 kHz
NOTE 1 In the frequency range 0,15 MHz to 0,5 MHz, the limit decreases
linearly with the logarithm of frequency.


4.1.3 Limits above 30 MHz
The telecommunication network shall meet the radiated limits specified in Table 2 according
to the measurement method specified in 5.3. The normalisation to the reference measurement
distance shall be as defined in 6.1.2. The measurement procedure defined in Clause 7 shall
be used.
In the case of rooms or buildings where both telecommunication networks and their connected
equipment are used, measurements shall be made only outside those rooms or buildings.
Table 2 – Limits of radiated disturbances from wire-line telecommunications networks
above 30 MHz
Frequency range Quasi-Peak Reference Measurement
Field strength measurement bandwidth

limit distance
MHz dB(µV/m)

30 to 230 30 10 m 120 kHz
230 to 1 000 37 10 m 120 kHz
NOTE 1  The lower limit shall apply at the transition frequency.

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5 Disturbance emission measurement methods
5.1 General arrangements
In order to get the highest readings of disturbances it shall be ensured that the part of the
telecommunication network being assessed operates at maximum wanted signal levels typical
for this site and in the mode that results in maximum RF disturbance field strength levels
consistent with normal operation. If the system is interactive, measurements shall also be
performed in the presence of both the upstream and downstream signals.
5.2 Conducted measurements below 30 MHz
For conducted disturbance emission measurements in the frequency range 150 kHz to
30 MHz, a suitable current probe in accordance with EN 55016-1 Subclause 5.2.1 is required.
A suitable current probe shall be clamped at the cable at a mechanically accessible point.
Subsequently, the com
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