IEC 61156-1:2023
(Main)Multicore and symmetrical pair/quad cables for digital communications - Part 1: Generic specification
Multicore and symmetrical pair/quad cables for digital communications - Part 1: Generic specification
IEC 61156-1:2023 specifies the definitions, requirements and test methods of multicore, symmetrical pair and quad cables. This document is applicable to communication systems such as local area networks (LANs) and data communication cables. It is also applicable to cables used for industrial applications, customer premises wiring and generic cabling comprising installation cables and cables for work area wiring which are defined in ISO/IEC 11801 (all parts). The cables covered by this document are intended to operate with voltages and currents normally encountered in communication systems. While these cables are not intended to be used in conjunction with low impedance sources, for example the electric power supplies of public utility mains, they are intended to be used to support the delivery of low voltage remote powering applications including but not restricted to Power over Ethernet as specified in ISO/IEC/IEEE 8802-3.
Câbles multiconducteurs à paires symétriques et quartes pour transmissions numériques - Partie 1: Spécification générique
L’IEC 61156-1:2023 spécifie les définitions, les exigences et les méthodes d’essai des câbles multiconducteurs, à paires symétriques et à quartes. Le présent document est applicable aux systèmes de transmission tels que les réseaux locaux (LAN) et les câbles de transmission de données. Il est aussi applicable aux câbles utilisés pour les applications industrielles, le câblage des locaux des clients et le câblage générique comprenant des câbles d’installation et des câbles destinés au câblage d’espaces de travail qui sont définis dans l’ISO/IEC 11801 (toutes les parties). Les câbles couverts par le présent document sont destinés à être exploités sous des tensions et courants rencontrés conventionnellement dans les systèmes de communication. Bien que ces câbles ne soient pas destinés à être utilisés en conjonction avec des sources de basse impédance, par exemple les alimentations électriques des réseaux de services publics, ils sont destinés à être utilisés pour prendre en charge les applications de téléalimentation basse tension, y compris notamment l’alimentation par Ethernet, comme spécifié dans l’ISO/IEC/IEEE 8802-3.
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IEC 61156-1 ®
Edition 4.0 2023-03
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Multicore and symmetrical pair/quad cables for digital communications –
Part 1: Generic specification
All rights reserved. Unless otherwise specified, 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
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About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
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IEC 61156-1 ®
Edition 4.0 2023-03
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Multicore and symmetrical pair/quad cables for digital communications –
Part 1: Generic specification
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.120.20 ISBN 978-2-8322-6666-3
– 2 – IEC 61156-1:2023 RLV © IEC 2023
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 10
4 Installation considerations . 16
5 Materials and cable construction . 16
5.1 General remarks . 16
5.2 Cable constructions . 16
5.2.1 General . 16
5.2.2 Conductor . 16
5.2.3 Insulation . 17
5.2.4 Cable element . 17
5.2.5 Cable make-up . 18
5.2.6 Screening of the cable core . 18
5.2.7 Sheath . 18
5.2.8 Identification . 19
5.2.9 Finished cable . 19
6 Characteristics and requirements . 19
6.1 General remarks – Test configurations . 19
6.2 Electrical characteristics and tests . 21
6.2.1 Conductor resistance . 21
6.2.2 Resistance unbalance. 21
6.2.3 Dielectric strength . 22
6.2.4 Insulation resistance . 22
6.2.5 Mutual capacitance . 22
6.2.6 Capacitance unbalance to earth. 22
6.2.7 Transfer impedance . 23
6.2.8 Coupling attenuation . 23
6.2.9 Current-carrying capacity . 23
6.3 Transmission characteristics . 23
6.3.1 General requirements . 23
6.3.2 Velocity of propagation (phase velocity) . 24
6.3.3 Phase delay and differential delay (delay skew) . 25
6.3.4 Attenuation . 26
6.3.5 Unbalance attenuation . 28
6.3.6 Near-end crosstalk . 36
6.3.7 Far-end crosstalk . 38
6.3.8 Alien (exogenous) near-end crosstalk . 42
6.3.9 Alien (exogenous) far-end crosstalk . 46
6.3.10 Alien (exogenous) crosstalk of bundled cables . 46
6.3.11 Impedance . 47
6.3.12 Return loss . 49
6.4 Mechanical and dimensional characteristics and requirements . 50
6.4.1 Measurement of dimensions . 50
6.4.2 Elongation at break of the conductor. 50
6.4.3 Tensile strength of the insulation . 50
6.4.4 Elongation at break of the insulation . 51
6.4.5 Adhesion of the insulation to the conductor . 51
6.4.6 Elongation at break of the sheath . 51
6.4.7 Tensile strength of the sheath . 51
6.4.8 Crush test of the cable . 51
6.4.9 Cold Impact test of the cable . 51
6.4.10 Bending under tension . 51
6.4.11 Repeated bending of the cable . 54
6.4.12 Tensile performance of the cable . 55
6.4.13 Shock test of the cable . 55
6.4.14 Bump test of the cable . 55
6.4.15 Vibration test of the cable . 55
6.5 Environmental characteristics . 55
6.5.1 Shrinkage of the insulation . 55
6.5.2 Wrapping test of the insulation after thermal ageing . 55
6.5.3 Bending test of the insulation at low temperature . 56
6.5.4 Elongation at break of the sheath after ageing . 56
6.5.5 Tensile strength of the sheath after ageing . 56
6.5.6 Sheath pressure test at high temperature . 56
6.5.7 Cold bend test of the cable . 56
6.5.8 Heat shock test . 57
6.5.9 Damp heat, steady state . 57
6.5.10 Solar radiation . 57
6.5.11 Solvents and contaminating fluids . 57
6.5.12 Salt mist and sulphur dioxide . 57
6.5.13 Water immersion . 57
6.5.14 Hygroscopicity . 57
6.5.15 Wicking. 57
6.5.16 Flame propagation characteristics of a single cable . 58
6.5.17 Flame propagation characteristics of bunched cables . 58
6.5.18 Resistance to fire test method . 59
6.5.19 Halogen gas evolution . 59
6.5.20 Smoke generation . 59
6.5.21 Toxic gas emission . 59
6.5.22 Integrated fire test method for cables in environmental air handling
spaces . 59
Annex A (informative) Acronyms for common cable constructions . 60
Bibliography . 62
Figure 1 – Resistor terminations in balun measurements . 20
Figure 2 – Test set-up for the measurement of attenuation, velocity of propagation and
phase delay . 26
Figure 3 – Test set-up for the measurement of the differential-mode loss of the baluns. 30
Figure 4 – Test set-up for the measurement of the common-mode loss of the baluns . 31
Figure 5 – Test set-up for unbalance attenuation at near end (TCL) . 33
Figure 6 – Test set-up for unbalance attenuation at far end (TCTL) . 34
Figure 7 – Test set-up for near-end crosstalk . 36
Figure 8 – Test set-up for far-end crosstalk . 39
– 4 – IEC 61156-1:2023 RLV © IEC 2023
Figure 9 – Test set-up for alien (exogenous) near-end crosstalk . 42
Figure 10 – Test assembly cross-section: six cables around one cable . 44
Figure 11 – Test assembly layout: six cables around one cable . 44
Figure 12 – Test set-up for characteristic impedance, terminated input impedance, and
return loss . 47
Figure 13 – U-bend test configuration . 52
Figure 14 – S-bend test configuration .
...
IEC 61156-1 ®
Edition 4.0 2023-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Multicore and symmetrical pair/quad cables for digital communications –
Part 1: Generic specification
Câbles multiconducteurs à paires symétriques et quartes pour transmissions
numériques –
Partie 1: Spécification générique
All rights reserved. Unless otherwise specified, 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
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
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les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.
IEC Secretariat Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.
IEC publications search - webstore.iec.ch/advsearchform IEC Products & Services Portal - products.iec.ch
The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
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committee, …). It also gives information on projects, replaced access to up to date content tailored to your needs.
and withdrawn publications.
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Stay up to date on all new IEC publications. Just Published
containing more than 22 300 terminological entries in English
details all new publications released. Available online and once
and French, with equivalent terms in 19 additional languages.
a month by email.
Also known as the International Electrotechnical Vocabulary
(IEV) online.
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IEC 61156-1 ®
Edition 4.0 2023-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Multicore and symmetrical pair/quad cables for digital communications –
Part 1: Generic specification
Câbles multiconducteurs à paires symétriques et quartes pour transmissions
numériques –
Partie 1: Spécification générique
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.120.20 ISBN 978-2-8322-6373-0
– 2 – IEC 61156-1:2023 © IEC 2023
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 9
4 Installation considerations . 14
5 Materials and cable construction . 15
5.1 General remarks . 15
5.2 Cable constructions . 15
5.2.1 General . 15
5.2.2 Conductor . 15
5.2.3 Insulation . 15
5.2.4 Cable element . 16
5.2.5 Cable make-up . 16
5.2.6 Screening of the cable core . 17
5.2.7 Sheath . 17
5.2.8 Identification . 17
5.2.9 Finished cable . 18
6 Characteristics and requirements . 18
6.1 General remarks – Test configurations . 18
6.2 Electrical characteristics and tests . 19
6.2.1 Conductor resistance . 19
6.2.2 Resistance unbalance. 19
6.2.3 Dielectric strength . 20
6.2.4 Insulation resistance . 20
6.2.5 Mutual capacitance . 20
6.2.6 Capacitance unbalance to earth. 20
6.2.7 Transfer impedance . 21
6.2.8 Coupling attenuation . 21
6.2.9 Current-carrying capacity . 21
6.3 Transmission characteristics . 21
6.3.1 General requirements . 21
6.3.2 Velocity of propagation (phase velocity) . 22
6.3.3 Phase delay and differential delay (delay skew) . 23
6.3.4 Attenuation . 23
6.3.5 Unbalance attenuation . 26
6.3.6 Near-end crosstalk . 32
6.3.7 Far-end crosstalk . 34
6.3.8 Alien (exogenous) near-end crosstalk . 36
6.3.9 Alien (exogenous) far-end crosstalk . 39
6.3.10 Alien (exogenous) crosstalk of bundled cables . 39
6.3.11 Impedance . 40
6.3.12 Return loss . 42
6.4 Mechanical and dimensional characteristics and requirements . 43
6.4.1 Measurement of dimensions . 43
6.4.2 Elongation at break of the conductor. 43
6.4.3 Tensile strength of the insulation . 43
6.4.4 Elongation at break of the insulation . 43
6.4.5 Adhesion of the insulation to the conductor . 43
6.4.6 Elongation at break of the sheath . 43
6.4.7 Tensile strength of the sheath . 43
6.4.8 Crush test of the cable . 43
6.4.9 Cold Impact test of the cable . 43
6.4.10 Bending under tension . 44
6.4.11 Repeated bending of the cable . 46
6.4.12 Tensile performance of the cable . 47
6.4.13 Shock test of the cable . 47
6.4.14 Bump test of the cable . 47
6.4.15 Vibration test of the cable . 48
6.5 Environmental characteristics . 48
6.5.1 Shrinkage of the insulation . 48
6.5.2 Wrapping test of the insulation after thermal ageing . 48
6.5.3 Bending test of the insulation at low temperature . 48
6.5.4 Elongation at break of the sheath after ageing . 48
6.5.5 Tensile strength of the sheath after ageing . 48
6.5.6 Sheath pressure test at high temperature . 48
6.5.7 Cold bend test of the cable . 48
6.5.8 Heat shock test . 49
6.5.9 Damp heat, steady state . 49
6.5.10 Solar radiation . 49
6.5.11 Solvents and contaminating fluids . 49
6.5.12 Salt mist and sulphur dioxide . 49
6.5.13 Water immersion . 49
6.5.14 Hygroscopicity . 49
6.5.15 Wicking. 50
6.5.16 Flame propagation characteristics of a single cable
...
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