IEC 60728-12:2001

INTERNATIONAL IEC
STANDARD
60728-12
First edition
2001-02
Cabled distribution systems for television
and sound signals –
Part 12:
Electromagnetic compatibility of systems
Systèmes de distribution par câbles destinés aux signaux
de radiodiffusion sonore et de télévision –
Partie 12:
Compatibilité électromagnétique des systèmes
Reference number
Publication numbering
As from 1 January 1997 all IEC publications are issued with a designation in the
60000 series. For example, IEC 34-1 is now referred to as IEC 60034-1.
Consolidated editions
The IEC is now publishing consolidated versions of its publications. For example,
edition numbers 1.0, 1.1 and 1.2 refer, respectively, to the base publication, the
base publication incorporating amendment 1 and the base publication incorporating
amendments 1 and 2.
Further information on IEC publications
The technical content of IEC publications is kept under constant review by the IEC,
thus ensuring that the content reflects current technology. Information relating to
this publication, including its validity, is available in the IEC Catalogue of
publications (see below) in addition to new editions, amendments and corrigenda.
Information on the subjects under consideration and work in progress undertaken
by the technical committee which has prepared this publication, as well as the list
of publications issued, is also available from the following:
• IEC Web Site (www.iec.ch)
• Catalogue of IEC publications
The on-line catalogue on the IEC web site (www.iec.ch/catlg-e.htm) enables
you to search by a variety of criteria including text searches, technical
committees and date of publication. On-line information is also available on
recently issued publications, withdrawn and replaced publications, as well as
corrigenda.
• IEC Just Published
This summary of recently issued publications (www.iec.ch/JP.htm) is also
available by email. Please contact the Customer Service Centre (see below) for
further information.
• Customer Service Centre
If you have any questions regarding this publication or need further assistance,
please contact the Customer Service Centre:
Email: custserv@iec.ch
Tel: +41 22 919 02 11
Fax: +41 22 919 03 00
INTERNATIONAL IEC
STANDARD
60728-12
First edition
2001-02
Cabled distribution systems for television
and sound signals –
Part 12:
Electromagnetic compatibility of systems
Systèmes de distribution par câbles destinés aux signaux
de radiodiffusion sonore et de télévision –
Partie 12:
Compatibilité électromagnétique des systèmes
 IEC 2001  Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
Telefax: +41 22 919 0300 e-mail: inmail@iec.ch IEC web site http://www.iec.ch
Commission Electrotechnique Internationale
PRICE CODE
R
International Electrotechnical Commission
For price, see current catalogue

– 2 – 60728-12  IEC:2001(E)
CONTENTS
Page
FOREWORD . 3
INTRODUCTION .5
Clause
1 Scope . 6
2 Normative references . 6
3 Terms, definitions, symbols and abbreviations . 7
3.1 Terms and definitions. 7
3.2 Abbreviations . 9
4 Methods of measurement . 9
4.1 Radiation from cable networks . 10
4.2 Immunity of cable networks . 13
5 Performance requirements . 14
5.1 Radiation from cable networks . 14
5.2 Immunity of cable networks . 15
Annex A (informative) Frequency ranges of typical safety of life services. 17
Annex B (informative) Interdependence between the maximum allowable field strength
and the minimum carrier-to-interference ratio . 18
Bibliography . 19

60728-12  IEC:2001(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
_________
CABLED DISTRIBUTION SYSTEMS FOR TELEVISION
AND SOUND SIGNALS –
Part 12: Electromagnetic compatibility of systems
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, the IEC publishes International Standards. Their preparation is
entrusted to technical committees; any IEC National Committee interested in the subject dealt with may
participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. The IEC collaborates closely with the International Organization
for Standardization (ISO) in accordance with conditions determined by agreement between the two
organizations.
2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60728-12 has been prepared by IEC technical committee 100:
Audio, video and multimedia systems and equipment.
The text of this standard is based on the following documents:
FDIS Report on voting
100/191/FDIS 100/217/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 3.
Annexes A and B are for information only.
The committee has decided that the contents of this publication will remain unchanged until
2003. At this date, the publication will be:
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
– 4 – 60728-12  IEC:2001(E)
The following differences exist in some countries:
a) In Great Britain, based on the national Regulation MPT 1510: Radiation Limits and
Measurement Standard; Electromagnetic radiation from cabled distribution systems
operating in the frequency range 30 MHz – 1 000 MHz; May 1984 (revised 1989 and 1997)
measurements of radiation from complete systems at the distribution frequencies in use
and at other specified relevant frequencies are performed (Great Britain).
b) In Great Britain, based on the national Regulation MPT 1520: Radiation Limits and
Measurement Standard; Electromagnetic radiation from cabled distribution systems
operating in the frequency range 300 kHz – 30 MHz; July 1984 (revised 1989 and 1997),
measurements of radiation from complete systems at the distribution frequencies in use
and at other specified relevant frequencies are performed (Great Britain).
c) In Finland, based on the Radio Act and the Telecommunications Market Act, the
Telecommunications Administration Centre can restrict or prohibit the use of certain
channels in cable networks for the reason that radiation from the network causes excessive
interference to co-frequency radiocommunications, even if the network fulfils the radiation
limits as stated in this standard (Finland).
d) In Finland, based on the Telecommunications Market Act, the Telecommunications
Administration Centre can restrict or prohibit the use of certain channels in cable networks
for the reason that the signal quality in the network will be degraded because of
interference caused by leakage to the network of co-frequency radiocommunication signals
(Finland).
e) In Japan, based on the Regulation for Enforcement of the Cable Television Broadcast Law,
radiated field strength (signal leakage) should not be more than 34 dB(µV/m) ( ≤50 µV/m) at
a distance of 3 m in the frequency range of operating channels (Japan).

60728-12  IEC:2001(E) – 5 –
INTRODUCTION
Standards of the IEC 60728 series deal with cable networks for television, sound signals and
interactive services including equipment, systems and installations:
– for headend-reception, processing and distribution of sound and television signals and their
associated data signals, and
– for processing, interfacing and transmitting all kinds of interactive services using all
applicable transmission media.
They cover all kinds of networks, such as:
– CATV-networks,
– MATV- and SMATV-networks,
– individual receiving networks,
and all kinds of equipment installed in such networks.
The scope of these standards extends from antennas and special signal source inputs to
headend or other interface points, to networks as a whole, up through network outlets, or
terminal inputs, where no network outlet exists.
The standardisation of any user terminals (i.e. tuners, receivers, decoders, multimedia
terminals etc.) as well as of any coaxial and optical cables and accessories is therefore
excluded.
This part of IEC 60728 has been prepared to lay down the measuring methods and
performance requirements and recommendations for electromagnetic compatibility of cabled
distribution networks for television and sound signals.

– 6 – 60728-12  IEC:2001(E)
CABLED DISTRIBUTION NETWORKS FOR TELEVISION
AND SOUND SIGNALS –
Part 12: Electromagnetic compatibility of systems
1 Scope
This part of IEC 60728 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 3,0 GHz.
This standard specifies EMC performance requirements and lays down the methods of
measurement.
Cable networks beyond the network outlets (e.g. receiver leads, in simplest terms) which begin
at the network outlet and at the subscriber's terminal equipment shall comply with these
recommendations provided that no other specific provisions apply.
To minimise the risk of interference to other radio services caused by possible radiation from a
cable network and to limit the possible penetration of external signals which may interfere with
the operation of a network, it is necessary not only to use equipment which satisfies the
requirement of IEC 60728-2 regarding limits of radiation and of immunity to external fields, but,
also, to ensure the integrity of all cable connections on each item of active or passive cable
network equipment.
Cable networks employing coaxial cables can be a source of interference to a wide range of
services that utilise the radio frequency spectrum. These include not only emergency services,
safety of life, broadcasting, aeronautical and radio navigation services but also land mobile,
amateur and cellular radio services.
As existing and planned radio services need to be protected, radiation limits specified for
cabled networks should be complied with.
Additional protection for certain services may be required by national regulations.
2 Normative references
The following normative documents contain provisions which, through reference in this text,
constitute provisions of this part of IEC 60728. For dated references, subsequent amendments
to, or revisions of, any of these publications do not apply. However, parties to agreements
based on this part of IEC 60728 are encouraged to investigate the possibility of applying the
most recent editions of the normative documents indicated below. For undated references, the
latest edition of the normative document referred to applies. Members of IEC and ISO maintain
registers of currently valid International Standards.
IEC 60050(161), International Electrotechnical Vocabulary (IEV) – Chapter 161:
Electromagnetic compatibility
IEC 60096, (all parts) Radio frequency cables
IEC 60728, (all parts) Cabled distribution systems for television and sound signals

60728-12  IEC:2001(E) – 7 –
IEC 60728-1:1986, Cabled distribution systems – Part 1: Systems primarily intended for sound
and television signals operating between 30 MHz and 1 GHz
IEC 60728-2:—, Cabled distribution systems for television and sound signals – Part 2:
Electromagnetic compatibility of equipment
3 Terms, definitions, symbols and abbreviations
3.1 Terms and definitions
For the purposes of this standard, the definitions contained in IEC 60050(161) and the
following definitions apply.
NOTE The most important definitions of IEC 60050(161) are repeated hereafter with the IEV numbering given in
brackets.
3.1.1
(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 By extension, the term "electromagnetic radiation" sometimes also covers induction phenomena.
[IEV 161-01-10]
3.1.2
immunity (to a disturbance)
ability of a device, equipment or system to perform without degradation in the presence of an
electromagnetic disturbance [IEV 161-01-20]
3.1.3
electromagnetic disturbance
any electromagnetic phenomenon which may degrade the performance of a device, equipment
or system, or adversely affect living or inert matter
NOTE An electromagnetic disturbance may be an electromagnetic noise, an unwanted signal or a change in the
propagation medium itself.
[IEV 161-01-05]
3.1.4
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
3.1.5
well-screened
a test set-up can be considered "well-screened" if its 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

A new edition of this publication is under consideration.
To be published
– 8 – 60728-12  IEC:2001(E)
3.1.6
electromagnetic interference (EMI)
degradation of the performance of an equipment, transmission channel or system caused by an
electromagnetic disturbance [IEV 161-01-06]
3.1.7
operating frequency range
passband for the wanted signals for which the equipment has been designed
3.1.8
carrier-to-interference ratio
the minimum level difference measured at the output of an active equipment 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)
3.1.9
headend
equipment which is connected between receiving antennas or other signal sources and the
remainder of the cable network, to process the signals to be distributed
NOTE The headend may, for example, comprise antenna amplifiers, frequency converters, combiners, separators
and generators.
3.1.10
system outlet
a device for interconnecting a subscriber feeder and a receiver lead
3.1.11
inhouse network
a cable network normally laid out inside buildings to which splitters, subscriber taps or looped
system outlets are connected
3.1.12
ignition noise
the unwanted emission of electromagnetic energy, predominantly impulsive in content, arising
from the ignition system within a vehicle or device
3.1.13
building penetration loss
the 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
3.1.14
disturbance level
the level of an electromagnetic disturbance at a given location, which results from all
contributing (interference) sources

60728-12  IEC:2001(E) – 9 –
3.1.15
degradation (of performance)
an undesired departure in the operational performance of any device, equipment or system
from its intended performance.
NOTE The term "degradation" can apply to temporary or permanent failure.
[IEV 161-01-19]
3.1.16
subscriber's feeder
a feeder connecting a subscriber tap to a network outlet or, where the latter is not used,
directly to the subscriber equipment
NOTE A subscriber feeder may include filters and a balun transformer.
3.1.17
receiver lead
a lead which connects the network outlet to the subscriber equipment
3.1.18
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
[IEV 161-03-07, modified]
3.2 Abbreviations
AM Amplitude Modulation
CATV Community Antenna Television (network)
DSC Distress, Safety and Calling
EMC Electromagnetic Compatibility
EMI Electromagnetic Interference
EPIRB Emergency Position Indicating Radiobeacons
FM Frequency Modulation
ILS Instrument Landing System
ITU-R International Telecommunication Union – Radiocommunication
MATV Master Antenna Television (network)
RF Radio Frequency
SMATV Satellite Master Antenna Television (network)
TV Television
VOR VHF O
...