ETSI ETS 300 127 ed.1 (1994-01)

SLOVENSKI STANDARD
SIST ETS 300 127 E1:2005
01-julij-2005
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Equipment Engineering (EE); Radiated emission testing of physically large
telecommunication systems
Ta slovenski standard je istoveten z: ETS 300 127 Edition 1
ICS:
33.040.01 Telekomunikacijski sistemi Telecommunication systems
na splošno in general
33.100.10 Emisija Emission
SIST ETS 300 127 E1:2005 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 127 E1:2005

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SIST ETS 300 127 E1:2005
EUROPEAN ETS 300 127
TELECOMMUNICATION January 1994
STANDARD
Source: ETSI TC-EE Reference: DE/EE-04002
ICS: 33.080
Equipment, emission
Key words:
Equipment Engineering (EE);
Radiated emission testing of physically large
telecommunication systems
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
F-06921 Sophia Antipolis CEDEX - FRANCE
Postal address:
650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Office address:
c=fr, a=atlas, p=etsi, s=secretariat - secretariat@etsi.fr
X.400: Internet:
Tel.: +33 92 94 42 00 - Fax: +33 93 65 47 16
Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the
foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 1994. All rights reserved.
New presentation - see History box

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ETS 300 127: January 1994
Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Editing and Committee Support Dept." at the address shown on the title page.

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ETS 300 127: January 1994
Contents
Foreword .5
1 Scope .7
2 Normative references.7
3 Definitions and abbreviations .7
3.1 Definitions .7
3.2 Abbreviations .8
4 Requirements.8
5 General operational conditions.8
5.1 Equipment configuration .8
5.2 Equipment cable layout.9
5.2.1 Intra-system cabling .9
5.2.2 Interface cabling.9
5.2.2.1 Unscreened cable systems .9
5.2.2.1.1 Overhead cable systems .10
5.2.2.1.2 Raised floors.10
5.2.2.2 Screened cable systems .10
5.3 Exercising equipment .10
5.4 Laboratory environment.10
6 Test results report .11
7 Test site requirements.11
8 Measurement method .12
9 New functional modules .12
Annex A (normative): Chamber factor measurement .19
A.1 Definitions.19
A.1.1 Chamber factor.19
A.1.2 Grey factor .19
A.2 Theory of measurement.19
A.3 Equipment .20
A.4 Test set-ups .20
A.5 Measurement procedure .21
A.6 Factors .21
A.7 Evaluation of the enclosure and application of the factors.21
History.25

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ETS 300 127: January 1994
Foreword
This European Telecommunication Standard (ETS) has been produced by the Equipment Engineering
(EE) Technical Committee of the European Telecommunications Standards Institute (ETSI).
This ETS specifies the technical requirements for the radiated emission measurement procedure for
physically large systems used within the public telecommunication network. A minimum representative
system is defined, which is used for compliance testing of physically large telecommunication systems.

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ETS 300 127: January 1994
1 Scope
This European Telecommunication Standard (ETS) specifies the technical requirements for the radiated
emission measurement procedure for physically large systems used within the public telecommunication
network, with the exception of radio equipment.
It applies to physically large systems which are comprised of equipments or systems requiring installation
documentation specific for those sites at which they are to be installed. In order to demonstrate
compliance of such systems, a minimum representative system is defined, which is used for compliance
testing. Installations built from units of the complying minimum representative system are deemed to
satisfy the radiated emission requirements.
The minimum representative system is representative of installed systems in terms of function (which
includes at least one of each functional unit type) and electromagnetic radiation characteristics. The
minimum representative system is subsequently referred to in this ETS as the Equipment Under Test
(EUT), to be used for compliance testing.
Minimum representative systems shall be tested on an Open Area Test Site (OATS) or in a suitable
chamber, the limits to be used are those as specified in EN 55022 [1].
2 Normative references
This ETS incorporates, by dated or undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications
apply to this ETS only when incorporated in it by amendment or revision. For undated references the latest
edition of the publication referred to applies.
[1] EN 55022 (1987): "Limits and methods of measurement of radio interference
characteristics of information technology equipment".
[2] CISPR Publication No. 16: "CISPR/A(Central Office) 48 Revision to CISPR
specification for radio interference measuring apparatus and measurement
methods".
[3] IEC 50(161) (1990): "International Electrotechnical Vocabulary. Chapter 161:
Electromagnetic compatibility".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of this ETS, the following definitions, together with those from IEC 50(161) [3], apply:
System: a set of sub-systems which, when connected together, produce a fully operational product and is
intended to be marketed as such.
Sub-system: a grouping of functional units which perform specific functions within the host system and
which communicates with other equipment via well-defined interfaces and protocols.
Functional unit: a grouping of electronic hardware which performs specific functions, but may be
connected with other functional units to produce the required sub-system.
New functional module: a replacement and/or addition for any grouping or arrangement of electronic
hardware (with its associated mechanical packaging and interconnections), which enhances or improves
the system operation.
Test site: this should be an OATS, with reflecting ground plane, or a suitable chamber with reflecting
ground plane.

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Minimum representative system: the minimum representative system is representative of installed
systems in terms of function (which includes at least one of each functional unit type) and electromagnetic
radiation characteristics. This shall be equipped to at least the minimum configuration which could be
offered for sale for use as an actual system. It excludes any operational equipment connected for the
purpose of monitoring or system measurements and which are connected for a temporary period. An
example of how the EUT is to be selected is given in figure 1.
Cable distribution point: the cable distribution point is the interface at which cabling shall be terminated;
this unit is the point at which cabling from the system is connected to the cabling from external units.
Physically large system: a group of racks functionally connected to form a commercially specified
system, which has a total dimension exceeding that which is practical for testing on a conventional 10 m
test site.
3.2 Abbreviations
For the purposes of this ETS, the following abbreviations apply:
EUT Equipment Under Test
OATS Open Area Test Site
4 Requirements
For the purpose of defining the system boundary from which the test distance is taken, the equipment
boundary shall be the straight line envelope around the EUT; this includes the cables specified for
attachment to the EUT for the purpose of test. Measurement distances are to be taken from this line.
Physically large systems are modular in nature, i.e. they will generally be increased in size (and
operational function) by the addition of like units. To ensure that the EUT is representative of installed
systems, in terms of function and electromagnetic radiation, tests shall be repeated with the EUT
configured with additional units.
If, by adding additional units, which generates synchronized noise, the emission levels do not increase
4 dB or more above the original maximum measured values, independent of frequency, then a minimum
representative system in terms of radiation has been achieved. The additional units shall be composed to
the largest possible extent of highest radiation sources, but they shall be typical of realistic installation.
If, with the increase of additional identical units, the radiation increases by more than 4 dB, then further
additional units shall be added until the increase is less than 4 dB.
After the addition of identical units (as shown in figure 2), the measured field levels from the
representative system shall not increase beyond compliance limits.
5 General operational conditions
5.1 Equipment configuration
The EUT shall conform to the manufacturer's normal installation practice. There exists for each EUT a
minimum set of interface lines which is required for the operation of the system and this number shall be
defined for each EUT and identified in the test report.
The sources of maximum emission shall be identified by measuring each functional unit on an individual
basis and, where applicable, its position in a rack.
The EUT shall then be assembled in such a way that emissions are maximised within any limitations
imposed by normal installation practice.

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5.2 Equipment cable layout
5.2.1 Intra-system cabling
All cables internal to the system, and used for its operation, shall be connected and be of such a length
and type required for the normal operation of the system. These shall be routed in accordance with the
relevant system installation instructions, such that these are typical of an installed system.
If raised floor or overhead cabling systems are offered, both types of cabling systems shall be
characterized by testing the equipment using those cable configurations (raised floor or overhead cabling).
The worst case cable configuration shall be used in the EUT tests.
If raised floor systems be characterized as the worst case and used for testing, and if the inter-unit cable
routing is into the raised floor system, the effect of the raised floor system shall be examined. The raised
floor shall be left in place if it forms part of the system screen, but where the raised floor is not intended to
be used as a screen, then in order to prevent incidental screening of emissions, the floor panels shall be
removed for the duration of the test.
5.2.2 Interface cabling
Cables between the system, the distribution point and external units, shall be of the type as specified by
the system supplier or as detailed by customer requirements, and shall follow the relevant system
installation practice. Care must be taken to ensure that noise from the test and exercising equipment does
not contribute to the emissions from the representative system. The method of orientating and terminating
the cables shall be noted in the test report.
The emission contributions from the system, cables and distribution point (where all of these elements are
involved) are difficult to separate; there are two cases to be considered:
1) unscreened cable systems;
2) screened cable systems.
Screening is achieved by one of two methods:
a) by use of screened cabling;
b) by the use of a screened floor or ducted systems in which unscreened cabling is run.
Measurement of these installation practices is performed as described in subclauses 5.2.2.1 and 5.2.2.2.
5.2.2.1 Unscreened cable systems
Wherever the distribution point is located, measurement shall be made using a length of unscreened
cabling configured as described in subclauses 5.2.2.1.1 and 5.2.2.1.2. Beyond this minimum length, the
cabling shall be taken off the measurement site below the ground plane to the exercising equipment.
Where this is not practicable, the cabling may run in screened sleeving which is bonded to the
measurement site ground plane.
Two types of cable installation practice shall be considered.

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5.2.2.1.1 Overhead cable systems
An overhead cable system is defined as one where cables are routed above the equipment. On exiting
from the EUT, all cabling shall run perpendicularly from the EUT in the horizontal plane for 1,5 metres,
before dropping to the ground plane.
Support of the cabling shall be of the type specified by the system supplier, or as detailed by customer
requirements, and shall follow the relevant system installation practice. Where the system supplier or
customer do not specify cable supports, then non-conducting unscreened cable supports shall be used.
The height and position of the cables shall be noted in the test report (see figure 3). The cabling shall be
taken off the measurement site below the ground plane to the exercising equipment. Where this is not
practicable, the cabling may run in screened sleeving which is bonded to the measurement site ground
plane.
5.2.2.1.2 Raised floors
Where a raised floor system is used (but the raised floor does not form part of the screen) then all cabling
shall drop through the raised floor towards the ground plane and run perpendicularly from the EUT in the
horizontal plane for 1,5 metres, the raised floor being removed (see subclause 5.2.1). The cabling shall
then be taken off the measurement site below the ground plane to the exercising equipment. Where this is
not practicable, the cabling may run in screened sleeving which is bonded to the measurement site ground
plane. All exposed, unscreened cabling, shall be on a support at a height of 10 cm (see figure 4).
The support shall be of the type specified by the system supplier, or as detailed by customer
requirements, and shall follow the relevant system installation practice. Where the system supplier or
customer do not specify cable supports, then non-conducting, unscreened cable supports shall be used.
5.2.2.2 Screened cable systems
Where a screened cabling system is used throughout the installation, cabling typical of the installation
practice shall be used during testing. Coaxial cables connected to the system is an example of screened
cabling.
Where screened cabling is used between a system and an unscreened distribution point, and unscreened
cabling is used beyond that point, then a test configuration shall be adopted which exposes the
unscreened cabling to the measurement antenna. This shall be achieved by arranging the EUT with an
unscreened distribution point located at the closest possible point to the system and forming part of the
EUT. The unscreened cabling shall then be exposed, following the principles as defined in subclause
5.2.2.1.
The length of screened cabling between the system and the unscreened distribution point shall be the
minimum length which could be used on any real installation. This minimum length shall be defined by the
system supplier and the excess length shall be bundled for low inductance. This length should be 10 m,
unless otherwise specified. Figu
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