Coaxial communication cables - Part 1-124: Electrical test methods - Test for coupling loss of radiating cable

IEC 61196-1-124:2022 defines the test method to determine the coupling loss of radiating coaxial communication cables that are intended for use in wireless communication systems such as tunnels, railways, highways, subways, elevators and other confined areas in which conventional antenna transmission is not satisfactory or even impossible.

Câbles coaxiaux de communication - Partie 1-124: Méthodes d’essai électrique - Essai de perte de couplage des câbles rayonnants

IEC 61196-1-124:2022 définit la méthode d’essai à appliquer pour déterminer la perte de couplage des câbles rayonnants coaxiaux de communication destinés à être utilisés dans les systèmes de communication sans fil tels que les tunnels, les réseaux ferrés, les autoroutes, les ascenseurs et d’autres milieux confinés dans lesquels la transmission conventionnelle par antenne n’est pas satisfaisante, voire est impossible.

General Information

Status
Published
Publication Date
11-Aug-2022
Technical Committee
Current Stage
PPUB - Publication issued
Completion Date
12-Aug-2022
Ref Project

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IEC 61196-1-124
Edition 1.0 2022-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Coaxial communication cables –
Part 1-124: Electrical test methods – Test for coupling loss of radiating cable
Câbles coaxiaux de communication –
Partie 1-124: Méthodes d’essai électrique – Essai de perte de couplage des
câbles rayonnants
IEC 61196-1-124:2022-08(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61196-1-124
Edition 1.0 2022-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Coaxial communication cables –
Part 1-124: Electrical test methods – Test for coupling loss of radiating cable
Câbles coaxiaux de communication –
Partie 1-124: Méthodes d’essai électrique – Essai de perte de couplage des
câbles rayonnants
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.120.10 ISBN 978-2-8322-5223-9

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 61196-1-124:2022 © IEC 2022
CONTENTS

FOREWORD ........................................................................................................................... 3

1 Scope .............................................................................................................................. 5

2 Normative references ...................................................................................................... 5

3 Terms and definitions ...................................................................................................... 5

4 Methodology .................................................................................................................... 5

4.1 General ................................................................................................................... 5

4.2 Free-space method ................................................................................................. 5

4.3 Ground-level method............................................................................................... 6

5 Test procedures .............................................................................................................. 7

5.1 General ................................................................................................................... 7

5.2 Equipment .............................................................................................................. 7

5.3 Calibration .............................................................................................................. 7

5.4 Measurement .......................................................................................................... 7

6 Expression of test results ................................................................................................ 8

6.1 Expression .............................................................................................................. 8

6.2 Mean value of the coupling loss .............................................................................. 9

7 Test report ....................................................................................................................... 9

8 Requirements .................................................................................................................. 9

Bibliography .......................................................................................................................... 10

Figure 1 – Antenna orientations with free-space method ......................................................... 6

Figure 2 – Antenna orientations with ground-level method ...................................................... 7

Figure 3 – Coupling loss with free-space method .................................................................... 8

Figure 4 – Coupling loss with ground-level method ................................................................. 8

---------------------- Page: 4 ----------------------
IEC 61196-1-124:2022 © IEC 2022 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
COAXIAL COMMUNICATION CABLES –
Part 1-124: Electrical test methods –
Test for coupling loss of radiating cable
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international

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rights. IEC shall not be held responsible for identifying any or all such patent rights.

IEC 61196-1-124 has been prepared by subcommittee 46A: Coaxial cables, of IEC technical

committee 46: Cables, wires, waveguides, RF connectors, RF and microwave passive
components and accessories. It is an International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
46A/1578/FDIS 46A/1587/RVD

Full information on the voting for its approval can be found in the report on voting indicated in

the above table.
The language used for the development of this International Standard is English.
---------------------- Page: 5 ----------------------
– 4 – IEC 61196-1-124:2022 © IEC 2022

This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in

accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available

at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are

described in greater detail at www.iec.ch/standardsdev/publications.

A list of all parts of the IEC 61196 series, under the general title: Coaxial communication cables,

can be found on the IEC website.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under webstore.iec.ch in the data related to the

specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 6 ----------------------
IEC 61196-1-124:2022 © IEC 2022 – 5 –
COAXIAL COMMUNICATION CABLES –
Part 1-124: Electrical test methods –
Test for coupling loss of radiating cable
1 Scope

This part of IEC 61196 defines the test method to determine the coupling loss of radiating

coaxial communication cables that are intended for use in wireless communication systems

such as tunnels, railways, highways, subways, elevators and other confined areas in which

conventional antenna transmission is not satisfactory or even impossible.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements 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.

IEC 61196-1, Coaxial communication cables − Part 1: Generic specification − General,

definitions and requirements

IEC 61196-4, Coaxial communication cables − Part 4: Sectional specification for radiating

cables
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 61196-1 and

IEC 61196-4 apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
4 Methodology
4.1 General

The measurements of coupling loss for radiating cables can be carried out by one of the two

methods, where the free-space method shall be the arbitration method if there is an argument:

– free-space method;
– ground-level method.
4.2 Free-space method

The arrangement of the cable is given in Figure 1. The cable is laid on non-metallic posts at a

height of 1,5 m to 2 m.
---------------------- Page: 7 ----------------------
– 6 – IEC 61196-1-124:2022 © IEC 2022

The cable shall be at least 10 λ, where λ is the cable wavelength of the measuring frequency,

but not shorter than 50 m or 10 λ; the larger value is applicable.

The antenna is put on a trolley and moved parallel to the cable. The height of the antenna

centre should be the same as that of the cable and its horizontal distance from the cable should

be about 2 m (additional distance can be added in the detail specification). Preferably, a half-

wavelength dipole shall be used. Type and gain of antenna used should be stated in the test

report.

No other metallic parts than the cable and the antenna should be included within a cylinder of

2 m (min.) in diameter surrounding the axis of the cable and the centre of the antenna.

The spatial orientation of the antenna should be as specified in the detail specification.

For basic antenna orientations for a dipole, see Figure 1.
Key
1 cable
2 radial
3 orthogonal
4 parallel
Figure 1 – Antenna orientations with free-space method
4.3 Ground-level method

The arrangement of the cable is given in Figure 2. The cable is laid on non-metallic spacers

which gives the cable a distance from the concrete floor of 10 cm to 12 cm.

The cable shall be at least 10 λ, where λ is the cable wavelength of the measuring frequency,

but not shorter than 50 m or 10 λ; the larger value is applicable.

The antenna is fixed to a trolley and moved along the cable, the centre of the antenna positioned

vertically above the cable at a distance of about 2 m (additional distance may be added in the

detail specification). Preferably, a half-wavelength dipole shall be used. Type and gain of

antenna used should be stated in the test report.

The spatial orientation of the antenna shall be as specified in the detail specification.

For basic antenna orientations for a dipole, see Figure 2.
---------------------- Page: 8 ----------------------
IEC 61196-1-124:2022 © IEC 2022 – 7 –
Key
1 cable
2 radial
3 orthogonal
4 parallel
Figure 2 – Antenna orientations with ground-level method
5 Test procedures
5.1 General

The ratio of the power P transmitted into the radiating cable at one point to the power P

t r

received by a half-wavelength dipole antenna located at a distance from the radiating cable at

the same point (see Formula (1)) can be defined by the following formula:
 
L 10⋅log
(1)
 
 r
where
L is the coupling loss, expressed in dB;

P is the transmission power in the radiating cable at one point, expressed in dBm;

is the receiving power of the half-wavelength dipole antenna at a distance from the

radiating cable at the same point, expressed in dBm.
5.2 Equipment
The following equipment can be used:
– a signal generator;
– a spectrum analyser (receiver);
– a vector network analyser.
5.3 Calibration

Connect the signal generator directly to the spectrum analyser with a short reach test lead. The

difference of power level between the signal generator and the spectrum analyser at every

specific frequency should be recorded as N prior to the measurement.
5.4 Measurement

Adjust the signal generator frequency and output power level. Feed the signal to port A of the

cable.
---------------------- Page: 9 ----------------------
– 8 – IEC 61196-1-124:2022 © IEC 2022

Record the power level received by the antenna as a function of the distance of the antenna

from the input port A of the cable by a spectrum analyser.

The test setup for free-space and ground-level method are given as Figure 3 and Figure 4,

respectively.

There should be sufficient local resolution for the measurement to be valid. Therefore,

10 measurements per half-wavelength should be made to calculate the coupling loss for

reception probabilities up to 95 %. To calculate higher reception probabilities, a sampling rate

of 20 measurements per half-wavelength should be made. If there is an argument, the total

number of measurements shall not be less than 1 000.
Figure 3 – Coupling loss with free-space method
Figure 4 – Coupling loss with ground-level method
6 Expression of test results
6.1 Expression
The coupling loss can be computed as:
L ()z N−Nz()− (α⋅+z) G
(2)
c er
where
G is the gain of the antenna, expressed in dBd;

L (z) is the level of local coupling loss from the input end (z) of cable, expressed in dB;

N is the power level at the cable input, expressed in dBm;
N is the power level at the antenna, expressed in dBm;
α is the attenuation constant, expressed in dB/100 m;
z is the distance from cable input to the antenna, expressed in 100 m.
---------------------- Page: 10 ----------------------
IEC 61196-1-124:2022 © IEC 2022 – 9 –

NOTE The test for attenuation constant of radiating cable is specified in IEC 61196-1-123.

Cable with periodic structures of radiating apertures create an RF field with a main lobe

...

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