IEC 61156-7:2003
(Main)Multicore and symmetrical pair/quad cables for digital communications - Part 7: Symmetrical pair cables with transmission characteristics up to 1 200 MHz - Sectional specification for digital and analog communication cables
Multicore and symmetrical pair/quad cables for digital communications - Part 7: Symmetrical pair cables with transmission characteristics up to 1 200 MHz - Sectional specification for digital and analog communication cables
provides the cable characteristics required by system developers to evaluate new systems as well as to enhance present systems
Câbles multiconducteurs à paires symétriques et quartes pour transmissions numériques - Partie 7: Câbles à paires symétriques avec caractéristiques de transmission jusqu'à 1 200 MHz - Spécification intermédiaire pour câbles de transmissions numériques et analogiques
fournit les caractéristiques de câble prescrites par ceux qui développent les systèmes pour permettre d'évaluer de nouveaux systèmes comme de valoriser les systèmes actuels.
General Information
Relations
Overview
IEC 61156-7:2003 is an international sectional specification for multicore symmetrical pair (screened) cables used in digital and analog communications. It defines the cable construction and electrical/transmission characteristics for symmetrical pair cables with transmission performance up to 1 200 MHz (measured at 20 °C). The standard provides the cable characteristics system developers and manufacturers need to evaluate new systems and improve existing ones.
Key topics and technical requirements
Scope & construction
- Covers cables with up to four individually screened pairs (STP); an overall core screen is optional.
- Conductor: solid annealed copper, diameter 0.5–0.8 mm.
- Insulation: thermoplastic options (polyolefin, fluoropolymer, low‑smoke zero‑halogen); solid or cellular.
- Sheath and identification requirements; attention to fire/smoke/halogen performance.
Electrical limits & tests (typically on 100 m samples)
- Conductor loop resistance ≤ 17.0 Ω/100 m; resistance unbalance ≤ 2.0%.
- Insulation resistance ≥ 5 000 MΩ·km at 20 °C; dielectric strength test voltages specified.
- Capacitance unbalance pair-to-ground ≤ 1 200 pF/km (1 kHz).
- Transfer impedance and screen resistance requirements (screening and braid coverage guidance).
Transmission performance up to 1 200 MHz
- Velocity of propagation ≥ 0.6 × c (4–1 200 MHz).
- Delay and differential delay (delay skew) limits: delay skew ≤ 25 ns/100 m; temperature dependence limits (±10 ns/100 m across –20 °C to +60 °C).
- Attenuation specified by formula α = A×f + B×f^0.5 + C [dB/100 m] with constants (A = 1.645, B = 0.01, C = 0.25); environmental increase ≤ 0.2%/°C.
- Near‑end crosstalk (PS NEXT), far‑end crosstalk (PS EL FEXT) and transverse conversion loss (TCL) specified by equations (with caps where indicated).
Standards-referenced test methods
- Read in conjunction with IEC 61156-1 and test methods such as IEC 60189-1 and IEC 62153-4-2.
Applications and who uses it
- Intended users: cable manufacturers, system developers, network designers, test laboratories, procurement/specification engineers, EMC specialists.
- Typical applications: high‑speed digital communications, broadband video and analog signal distribution, multimedia systems and any 4‑pair screened cable applications requiring verified performance up to 1 200 MHz.
- Value: ensures consistent performance metrics (attenuation, crosstalk, delay skew, screening) so systems designers can predict link behavior and interoperability.
Related standards
- IEC 61156-1 (generic specification)
- IEC 61156-7-1 (detail specification blank)
- IEC 60189-1, IEC 60304, IEC 62153-4-2
Keywords: IEC 61156-7, symmetrical pair cables, STP, 1 200 MHz, attenuation, NEXT, FEXT, delay skew, transfer impedance, cable specification.
Frequently Asked Questions
IEC 61156-7:2003 is a standard published by the International Electrotechnical Commission (IEC). Its full title is "Multicore and symmetrical pair/quad cables for digital communications - Part 7: Symmetrical pair cables with transmission characteristics up to 1 200 MHz - Sectional specification for digital and analog communication cables". This standard covers: provides the cable characteristics required by system developers to evaluate new systems as well as to enhance present systems
provides the cable characteristics required by system developers to evaluate new systems as well as to enhance present systems
IEC 61156-7:2003 is classified under the following ICS (International Classification for Standards) categories: 33.120.20 - Wires and symmetrical cables. The ICS classification helps identify the subject area and facilitates finding related standards.
IEC 61156-7:2003 has the following relationships with other standards: It is inter standard links to IEC 61156-7:2003/AMD1:2012, IEC 61156-7:2003/COR1:2003, IEC 61156-7:2023. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase IEC 61156-7:2003 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of IEC standards.
Standards Content (Sample)
INTERNATIONAL IEC
STANDARD
61156-7
First edition
2003-05
Multicore and symmetrical pair/quad cables
for digital communications –
Part 7:
Symmetrical pair cables with transmission
characteristics up to 1 200 MHz –
Sectional specification for digital and
analog communication cables
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.
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INTERNATIONAL IEC
STANDARD
61156-7
First edition
2003-05
Multicore and symmetrical pair/quad cables
for digital communications –
Part 7:
Symmetrical pair cables with transmission
characteristics up to 1 200 MHz –
Sectional specification for digital and
analog communication cables
IEC 2003 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.
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PRICE CODE
Commission Electrotechnique Internationale
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International Electrotechnical Commission
Международная Электротехническая Комиссия
For price, see current catalogue
– 2 – 61156-7 IEC:2003(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MULTICORE AND SYMMETRICAL PAIR/QUAD CABLES
FOR DIGITAL COMMUNICATIONS –
Part 7: Symmetrical pair cables with transmission
characteristics up to 1 200 MHz –
Sectional specification for digital and analog
communication cables
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 61156-7 has been prepared by subcommittee 46C: Wires and
symmetric cables, of IEC technical committee 46: Cables, wires, waveguides, r.f. connectors, r.f.
and microwave passive components and accessories.
The text of this standard is based on the following documents:
FDIS Report on voting
46C/573/FDIS 46C/591/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 standard is to be read in conjunction with IEC 61156-1.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this publication will remain unchanged until 2008.
At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.
The contents of the corrigendum of September 2003 have been included in this copy.
61156-7 IEC:2003(E) – 3 –
MULTICORE AND SYMMETRICAL PAIR/QUAD CABLES
FOR DIGITAL COMMUNICATIONS –
Part 7: Symmetrical pair cables with transmission
characteristics up to 1 200 MHz –
Sectional specification for digital and analog
communication cables
1 General
1.1 Scope
This sectional specification relates to IEC 61156-1.
The cables described herein may be used for various communication systems as well as for analog
systems, such as video, that exist or are under development and which may use as many as four
pairs simultaneously. In this sense, this sectional specification provides the cable characteristics
required by system developers to evaluate new systems as well as to enhance present systems.
It covers a cable having four individually screened (STP) pairs. The cable may be provided with
a common screen over the cable core.
The transmission characteristics are specified up to a frequency of 1 200 MHz and at a
temperature of 20 °C.
The cables covered by this sectional specification are intended to operate with voltages and
currents normally encountered in communication systems. These cables are not intended to be
used in conjunction with low impedance sources, for example, the electric power supply of public
utility mains.
1.2 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.
IEC 60189-1:1986, Low-frequency cables and wires with PVC insulation and PVC sheath – Part 1:
General test and measuring methods
IEC 60304, Standard colours for insulation for low-frequency cables and wires
IEC 61156-1:2002, Multicore and symmetrical pair/quad cables for digital communications – Part 1:
Generic specification
IEC 61156-7-1, Multicore and symmetrical pair/quad cables for digital communications – Part 7-1:
Symmetrical pair cables with transmission characteristics up to 1 200 MHz – Blank detail
specification for digital and analog communication cables
IEC 62153-4-2, Metallic telecommunication cable test methods – Part 4-2: Screening and coupling
attenuation – Injection clamp method
– 4 – 61156-7 IEC:2003(E)
1.3 Installation considerations
Under consideration.
1.4 Climatic conditions
Under static conditions, the cables shall operate in the temperature range from –20 °C to +60 °C.
The temperature dependence of the cables is specified for screened cables and should be taken
into account for the design of actual cabling systems.
The recommended temperature range during installation should be indicated in the relevant detail
specification.
2 Definitions, materials and cable construction
2.1 Definitions
See 2.1 of IEC 61156-1.
2.2 Materials and cable construction
2.2.1 General remarks
The choice of materials and cable construction shall be suitable for the intended application and
installation of the cable. Particular care shall be taken to meet any special requirements for fire
performance (such as burning properties, smoke generation, evolution of halogen gas, etc.).
A detail specification may be prepared.
2.2.2 Cable construction
The cable construction shall be in accordance with the materials, dimensions and assembly details
given in the relevant detail specification.
2.2.3 Conductor
The conductor shall be a solid annealed copper conductor, in accordance with 2.2.3 of IEC 61156-1,
and shall have a diameter between 0,5 mm and 0,8 mm.
2.2.4 Insulation
The conductor shall be insulated with a suitable thermoplastic material. Examples of suitable
materials are
– polyolefin;
– fluoropolymer;
– low-smoke zero-halogen thermoplastic material.
The insulation may be solid or cellular with or without a solid dielectric skin. The insulation shall
be continuous and shall have a thickness such that the completed cable meets the specified
requirements. The nominal thickness of the insulation shall be compatible with the method of
conductor termination.
2.2.5 Colour code of insulation
The colour code is not specified but shall be indicated in the relevant detail specification. The
colours shall be readily identifiable and shall correspond reasonably with the standard colours
shown in IEC 60304.
NOTE It is acceptable to mark or stripe the "a" wire with the colour of the "b" wire to facilitate pair identification.
61156-7 IEC:2003(E) – 5 –
2.2.6 Cable element
The cable element shall be a tested pair.
2.2.7 Screening of the cable element
The screen for the cable element shall be in accordance with 2.2.7 of IEC 61156-1. If a braid is
used, the minimum braid coverage shall be such as to meet the screening requirements of this
standard. The individual components used to screen the cable element shall be in electrical
contact.
2.2.8 Cable make-up
The core of the cable may be protected by wrappings of a non-hygroscopic tape.
2.2.9 Screening of cable core
A screen for the cable core may be provided. The screen shall be in accordance with 2.2.9 of
IEC 61156-1.
2.2.10 Sheath
The sheath material shall consist of a suitable thermoplastic material.
Examples of suitable materials are
– polyolefin;
– PVC;
– fluoropolymer;
– low-smoke zero-halogen thermoplastic material.
The sheath shall be continuous, having a uniform thickness. A non-metallic ripcord may be
provided. When provided, the ripcord shall be non-hygroscopic.
2.2.11 Colour of sheath
The colour of the sheath is not specified, but it should be stated in the relevant detail specification.
2.2.12 Identification
Each length of cable shall be identified as to the manufacturer and, when indicated in the relevant
detail specification, the year of manufacture, using one of the following methods:
– appropriately coloured threads or tapes;
– with a printed tape;
– printing on the cable core wrapping;
– marking on the sheath.
Additional markings, such as length marking etc., are permitted on the cable sheath. When used,
such markings should be indicated in the relevant detail specification.
2.2.13 Finished cable
The finished cable shall be adequately protected for storage and shipment.
– 6 – 61156-7 IEC:2003(E)
3 Characteristics and requirements
3.1 General remarks
This clause lists the characteristics and minimum requirements of a cable complying with this
specification. Test methods shall be in accordance with Clause 3 of IEC 61156-1. A detail
specification may be prepared to identify a specific product and its performance capabilities (see
Clause 4).
3.2 Electrical characteristics
The tests shall be carried out on a cable length of not less than 100 m, unless otherwise specified.
3.2.1 Conductor resistance
When measured in accordance with 5.1 of IEC 60189-1, the maximum loop-resistance shall not
exceed 17,0 Ω/100 m of cable.
3.2.2 Resistance unbalance
When measured in accordance with 2.1.1 of IEC 61156-1, the resistance unbalance of a pair shall
not exceed 2,0 %.
3.2.3 Dielectric strength
The test shall be performed on conductor/conductor and conductor/screen with 1,0 kV d.c. for
1 min or, alternately, with 2,5 kV d.c. for 2 s. An a.c. voltage may be used. The a.c. voltage levels
in these cases shall be 0,7 kV a.c. for 1 min or, alternately, 1,7 kV a.c. for 2 s.
NOTE When installed in conjunction with power cables, local regulati
...
IEC 61156-7
Edition 1.0 2003-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Multicore and symmetrical pair/quad cables for digital communications –
Part 7: Symmetrical pair cables with transmission characteristics up to
1 200 MHz – Sectional specification for digital and analog communication cables
Câbles multiconducteurs à paires symétriques et quartes pour transmissions
numériques –
Partie 7: Câbles à paires symétriques avec caractéristiques de transmission
jusqu’à 1 200 MHz – Spécification intermédiaire pour câbles de transmissions
numériques et analogiques
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IEC 61156-7
Edition 1.0 2003-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Multicore and symmetrical pair/quad cables for digital communications –
Part 7: Symmetrical pair cables with transmission characteristics up to
1 200 MHz – Sectional specification for digital and analog communication cables
Câbles multiconducteurs à paires symétriques et quartes pour transmissions
numériques –
Partie 7: Câbles à paires symétriques avec caractéristiques de transmission
jusqu’à 1 200 MHz – Spécification intermédiaire pour câbles de transmissions
numériques et analogiques
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
N
CODE PRIX
ICS 33.120.20 ISBN 2-8318-7286-3
– 2 – 61156-7 © CEI:2003
COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
CÂBLES MULTICONDUCTEURS À PAIRES SYMÉTRIQUES ET QUARTES
POUR TRANSMISSIONS NUMÉRIQUES –
Partie 7: Câbles à paires symétriques
avec caractéristiques de transmission jusqu’à 1 200 MHz –
Spécification intermédiaire pour câbles de transmissions
numériques et analogiques
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La Norme internationale CEI 61156-7 a été établie par le sous-comité 46C: Câbles symétriques et
fils, du comité d'études 46 de la CEI: Câbles, fils, guides d’ondes, connecteurs, composants
passifs pour micro-onde et accessoires.
La présente version bilingue, publiée en 2003-11, correspond à la version anglaise et à son
Corrigendum 1 (2003-09).
Le texte anglais de cette norme est issu des documents 46C/573/FDIS et 46C/591/RVD.
Le rapport de vote 46C/591/RVD donne toute information sur le vote ayant abouti à l'approbation
de cette norme.
61156-7 © IEC:2003 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MULTICORE AND SYMMETRICAL PAIR/QUAD CABLES
FOR DIGITAL COMMUNICATIONS –
Part 7: Symmetrical pair cables with transmission
characteristics up to 1 200 MHz –
Sectional specification for digital and analog
communication cables
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 co-
operation on all questions concerning standardization in the electrical and electronic fields. To this end and in
addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). 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. 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 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
IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between any
IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment
declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or other
damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising
out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61156-7 has been prepared by subcommittee 46C: Wires and
symmetric cables, of IEC technical committee 46: Cables, wires, waveguides, r.f. connectors, r.f.
and microwave passive components and accessories.
This bilingual version, published in 2003-11, corresponds to the English version including its
Corrigendum 1 (2003-09).
The text of this standard is based on the following documents:
FDIS Report on voting
46C/573/FDIS 46C/591/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.
– 4 – 61156-7 CEI:2003
La version française de cette norme n’a pas été soumise au vote.
Cette norme est à lire conjointement avec la CEI 61156-1.
Cette publication a été rédigée en conformité avec les Directives ISO/CEI, Partie 2.
Le comité a décidé que le contenu de cette publication ne sera pas modifié avant 2008. A cette
date, la publication sera
• reconduite;
• supprimée;
• remplacée par une édition révisée, ou
• amendée.
61156-7 IEC:2003 – 5 –
The French version has not been voted upon.
This standard is to be read in conjunction with IEC 61156-1.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this publication will remain unchanged until 2008.
At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
– 6 – 61156-7 CEI:2003
CÂBLES MULTICONDUCTEURS À PAIRES SYMÉTRIQUES ET QUARTES
POUR TRANSMISSIONS NUMÉRIQUES –
Partie 7: Câbles à paires symétriques
avec caractéristiques de transmission jusqu’à 1 200 MHz –
Spécification intermédiaire pour câbles de transmissions
numériques et analogiques
1 Généralités
1.1 Domaine d’application
Cette spécification intermédiaire se rapporte à la CEI 61156-1.
Les câbles décrits ici peuvent être utilisés pour divers systèmes de communication ainsi que pour
des systèmes analogiques, tels que vidéo, qui existent ou sont en cours de développement et qui
peuvent utiliser jusqu’à quatre paires simultanément. En ce sens, cette spécification intermédiaire
fournit les caractéristiques de câble prescrites par ceux qui développent les systèmes pour
permettre d’évaluer de nouveaux systèmes comme de valoriser les systèmes actuels.
Elle traite de câbles à quatre paires avec écran individuel (STP). Les câbles peuvent être fournis
avec un écran collectif sur l’âme du câble.
Les caractéristiques de transmission des câbles sont spécifiés jusqu’à une fréquence de
1 200 MHz et à une température de 20 °C.
Les câbles traités dans cette spécification intermédiaire sont destinés à fonctionner avec les
tensions et courants normalement rencontrés dans les systèmes de communication. Ces câbles
ne sont pas destinés à être utilisés en liaison avec des sources à basse impédance, par exemple
l’alimentation en puissance électrique du secteur du service public.
1.2 Références normatives
Les documents en référence qui suivent sont indispensables pour la mise en application de ce
document. Pour les références datées, seule l’édition citée s’applique. Pour les références non
datées, la dernière édition du document en référence (y compris les éventuels amendements)
s’applique.
CEI 60189-1:1986, Câbles et fils pour basses fréquences isolés au PVC et sous gaine de PVC –
Première partie: Méthodes générales d'essai et de vérification
CEI 60304, Couleurs de référence de l'enveloppe isolante pour câbles et fils pour basses
fréquences
CEI 61156-1:2002, Câbles multiconducteurs à paires symétriques et quartes pour transmissions
numériques – Part 1: Spécification générique
CEI 61156-7-1, Câbles multiconducteurs à paires symétriques et quartes pour transmissions
numériques – Part 7-1: Câbles à paires symétriques avec caratéristiques de transmission jusqu'à
1 200 MHz – Spécification particulière cadre pour câbles de transmissions numériques et
analogiques
IEC 62153-4-2, Méthodes d'essai des câbles métalliques de communication – Partie 4-2:
Compatibilité électromagnétique (CEM) – Affaiblissement d'écran et de couplage – Méthode de
la pince à injection
61156-7 IEC:2003 – 7 –
MULTICORE AND SYMMETRICAL PAIR/QUAD CABLES
FOR DIGITAL COMMUNICATIONS –
Part 7: Symmetrical pair cables with transmission
characteristics up to 1 200 MHz –
Sectional specification for digital and analog
communication cables
1 General
1.1 Scope
This sectional specification relates to IEC 61156-1.
The cables described herein may be used for various communication systems as well as for analog
systems, such as video, that exist or are under development and which may use as many as four
pairs simultaneously. In this sense, this sectional specification provides the cable characteristics
required by system developers to evaluate new systems as well as to enhance present systems.
It covers a cable having four individually screened (STP) pairs. The cable may be provided with
a common screen over the cable core.
The transmission characteristics are specified up to a frequency of 1 200 MHz and at a
temperature of 20 °C.
The cables covered by this sectional specification are intended to operate with voltages and
currents normally encountered in communication systems. These cables are not intended to be
used in conjunction with low impedance sources, for example, the electric power supply of public
utility mains.
1.2 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.
IEC 60189-1:1986, Low-frequency cables and wires with PVC insulation and PVC sheath – Part 1:
General test and measuring methods
IEC 60304, Standard colours for insulation for low-frequency cables and wires
IEC 61156-1:2002, Multicore and symmetrical pair/quad cables for digital communications – Part 1:
Generic specification
IEC 61156-7-1, Multicore and symmetrical pair/quad cables for digital communications – Part 7-1:
Symmetrical pair cables with transmission characteristics up to 1 200 MHz – Blank detail
specification for digital and analog communication cables
IEC 62153-4-2, Metallic telecommunication cable test methods – Part 4-2: Electromagnetic
compatibility (EMC) – Screening and coupling attenuation – Injection clamp method
– 8 – 61156-7 CEI:2003
1.3 Considérations d’installation
A l’étude.
1.4 Conditions climatiques
Dans des conditions immuables, les câbles doivent fonctionner dans la plage de températures de
–20 °C à +60 °C. L’incidence de la température des câbles est spécifiée pour les câbles avec
écran et il convient qu’elle soit prise en compte pour la conception d’un système de câblage
déterminé.
Il convient que la plage de températures recommandée durant l’installation soit indiquée dans la
spécification particulière appropriée.
2 Définitions, matériaux et construction du câble
2.1 Définitions
Voir 2.1 de la CEI 61156-1.
2.2 Matériaux et construction du câble
2.2.1 Remarques générales
Le choix des matériaux et la construction des câbles doivent être conformes à l'application d'usage
et l'installation du câble. Des attentions particulières doivent être prises pour répondre aux
exigences spéciales pour la tenue au feu (telles que des propriétés de brûlage, d'émission de
fumée, de dégagement de gaz halogéné, etc.). Une spécification particulière peut être préparée.
2.2.2 Construction du câble
La construction des câbles doit être conforme aux détails concernant les matériaux, les
dimensions et l’assemblage donnés dans la spécification particulière appropriée.
2.2.3 Conducteur
Le conducteur doit être en cuivre recuit massif en conformité à 2.2.3 de la CEI 61156-1 et doit
avoir un diamètre nominal compris entre 0,5 mm et 0,8 mm.
2.2.4 Enveloppe isolante
Le conducteur doit être isolé avec un matériau thermoplastique adapté.
A titre d'exemple:
– polyoléfine;
– polymères fluorés;
– matériau thermoplastique sans halogène à faible émission de fumée.
L'isolation peut être massive ou cellulaire avec ou sans peau. L'isolation doit être continue et doit
avoir une épaisseur telle que le câble terminé satisfasse aux exigences. L'épaisseur nominale de
l'enveloppe doit être compatible avec la méthode de raccordement des conducteurs.
61156-7 IEC:2003 – 9 –
1.3 Installation considerations
Under consideration.
1.4 Climatic conditions
Under static conditions, the cables shall operate in the temperature range from –20 °C to +60 °C.
The temperature dependence of the cables is specified for screened cables and should be taken
into account for the design of actual cabling systems.
The recommended temperature range during installation should be indicated in the relevant detail
specification.
2 Definitions, materials and cable construction
2.1 Definitions
See 2.1 of IEC 61156-1.
2.2 Materials and cable construction
2.2.1 General remarks
The choice of materials and cable construction shall be suitable for the intended application and
installation of the cable. Particular care shall be taken to meet any special requirements for fire
performance (such as burning properties, smoke generation, evolution of halogen gas, etc.).
A detail specification may be prepared.
2.2.2 Cable construction
The cable construction shall be in accordance with the materials, dimensions and assembly details
given in the relevant detail specification.
2.2.3 Conductor
The conductor shall be a solid annealed copper conductor, in accordance with 2.2.3 of IEC 61156-1,
and shall have a diameter between 0,5 mm and 0,8 mm.
2.2.4 Insulation
The conductor shall be insulated with a suitable thermoplastic material.
Examples of suitable materials are:
– polyolefin;
– fluoropolymer;
– low-smoke zero-halogen thermoplastic material.
The insulation may be solid or cellular with or without a solid dielectric skin. The insulation shall
be continuous and shall have a thickness such that the completed cable meets the specified
requirements. The nominal thickness of the insulation shall be compatible with the method of
conductor termination.
– 10 – 61156-7 CEI:2003
2.2.5 Code de couleurs de l'enveloppe isolante
Le code de couleurs n'est pas spécifié mais doit être indiqué dans la spécification particulière
appropriée. Les couleurs doivent être facilement identifiables et doivent correspondre raison-
nablement aux couleurs standard de la CEI 60304.
NOTE Il est accepté de marquer ou de faire des anneaux au filet sur le conducteur «a» avec la couleur du conducteur
«b» pour faciliter l'identification de la paire.
2.2.6 Elément du câblage
L'élément du câblage doit être une paire torsadée.
2.2.7 Blindage de l'élément de câblage
L’écran sur les éléments de câblage doit être conforme à 2.2.7 de la CEI 61156-1. Si une tresse
est utilisée, la couverture minimale de la tresse doit être telle qu’elle satisfasse aux exigences de
la présente norme en ce qui concerne le blindage. Les composants individuels utilisés pour l’écran
sur l’élément de câblage doivent être en contact électrique.
2.2.8 Constitution du câble
L'âme du câble peut être enveloppée avec une couche de protection en matériau non
hygroscopique.
2.2.9 Ecran sur l'âme du câble
Un écran sur l’âme du câble peut être prévu. L'écran doit être conforme à 2.2.9 de la CEI 61156-1.
2.2.10 Gaine
Le matériau de gainage doit être un matériau thermoplastique adapté.
A titre d'exemple:
– polyoléfine;
– PVC;
– polymères fluorés;
– matériau thermoplastique sans halogène à faible émission de fumée.
La gaine doit être continue avec une épaisseur aussi uniforme que possible.
Un filin de déchirement non métallique peut être prévu. Lorsque présent, le filin de déchirement
doit être non hygroscopique.
2.2.11 Couleur de la gaine
La couleur de la gaine n’est pas spécifiée, mais il convient qu’elle soit indiquée dans la
spécification particulière appropriée.
2.2.12 Identification
Chaque longueur de câble doit être identifiée avec le nom du fabricant et, lorsque prescrit dans
la spécification particulière appropriée, l'année de fabrication, en utilisant l'une des méthodes ci-
après:
a) filin ou ruban de couleur appropriée;
b) ruban imprimé;
61156-7 IEC:2003 – 11 –
2.2.5 Colour code of insulati
...
IEC 61156-7 ®
Edition 1.1 2012-12
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Multicore and symmetrical pair/quad cables for digital communications –
Part 7: Symmetrical pair cables with transmission characteristics up to
1 200 MHz – Sectional specification for digital and analog communication cables
Câbles multiconducteurs à paires symétriques et quartes pour transmissions
numériques –
Partie 7: Câbles à paires symétriques avec caractéristiques de transmission
jusqu’à 1 200 MHz – Spécification intermédiaire pour câbles de transmissions
numériques et analogiques
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IEC 61156-7 ®
Edition 1.1 2012-12
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Multicore and symmetrical pair/quad cables for digital communications –
Part 7: Symmetrical pair cables with transmission characteristics up to
1 200 MHz – Sectional specification for digital and analog communication
cables
Câbles multiconducteurs à paires symétriques et quartes pour transmissions
numériques –
Partie 7: Câbles à paires symétriques avec caractéristiques de transmission
jusqu’à 1 200 MHz – Spécification intermédiaire pour câbles de transmissions
numériques et analogiques
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.120.20 ISBN 978-2-8322-0563-1
– 2 – 61156-7 IEC:2003+A1:2012
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MULTICORE AND SYMMETRICAL PAIR/QUAD CABLES
FOR DIGITAL COMMUNICATIONS –
Part 7: Symmetrical pair cables with transmission
characteristics up to 1 200 MHz –
Sectional specification for digital and analog
communication cables
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 co-
operation on all questions concerning standardization in the electrical and electronic fields. To this end and in
addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). 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. 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 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
IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between any
IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services
carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or other
damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising
out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
This consolidated version of the official IEC Standard and its amendment has been prepared
for user convenience.
IEC 61156-7 edition 1.1 contains the first edition (2003) [documents 46C/573/FDIS and 46C/591/
RVD] and its amendment 1 (2012) [documents 46C/956/CDV and 46C/965/RVC].
A vertical line in the margin shows where the base publication has been modified by
amendment 1. Additions and deletions are displayed in red, with deletions being struck
through.
61156-7 IEC:2003+A1:2012 – 3 –
International Standard IEC 61156-7 has been prepared by subcommittee 46C: Wires and
symmetric cables, of IEC technical committee 46: Cables, wires, waveguides, r.f. connectors, r.f.
and microwave passive components and accessories.
The bilingual version (2003-11) replaces the English version including its Corrigendum 1
(2003-09).
The French version has not been voted upon.
This standard is to be read in conjunction with IEC 61156-1.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of the base publication and its amendments will
remain unchanged until the stability date indicated on the IEC web site under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the publication
will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The “colour inside” logo on the cover page of this publication indicates that
it contains colours which are considered to be useful for the correct understanding of its
contents. Users should therefore print this publication using a colour printer.
– 4 – 61156-7 IEC:2003+A1:2012
MULTICORE AND SYMMETRICAL PAIR/QUAD CABLES
FOR DIGITAL COMMUNICATIONS –
Part 7: Symmetrical pair cables with transmission
characteristics up to 1 200 MHz –
Sectional specification for digital and analog
communication cables
1 General
1.1 Scope
This sectional specification relates to IEC 61156-1.
The cables described herein may be used for various communication systems as well as for analog
systems, such as video, that exist or are under development and which may use as many as four
pairs simultaneously. In this sense, this sectional specification provides the cable characteristics
required by system developers to evaluate new systems as well as to enhance present systems.
It covers a cable having four individually screened (STP) pairs. The cable may be provided with a
common screen over the cable core.
The transmission characteristics are specified up to a frequency of 1 200 MHz and at a
temperature of 20 °C.
The cables covered by this sectional specification are intended to operate with voltages and
currents normally encountered in communication systems. These cables are not intended to be
used in conjunction with low impedance sources, for example, the electric power supply of public
utility mains.
1.2 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.
IEC 60189-1:1986, Low-frequency cables and wires with PVC insulation and PVC sheath – Part 1:
General test and measuring methods
IEC 60304, Standard colours for insulation for low-frequency cables and wires
IEC 61156-1:2002, Multicore and symmetrical pair/quad cables for digital communications – Part 1:
Generic specification
IEC 61156-7-1, Multicore and symmetrical pair/quad cables for digital communications – Part 7-1:
Symmetrical pair cables with transmission characteristics up to 1 200 MHz – Blank detail
specification for digital and analog communication cables
IEC 62153-4-2, Metallic telecommunication cable test methods – Part 4-2: Electromagnetic
compatibility (EMC) – Screening and coupling attenuation – Injection clamp method
61156-7 IEC:2003+A1:2012 – 5 –
1.3 Installation considerations
Under consideration.
1.4 Climatic conditions
Under static conditions, the cables shall operate in the temperature range from –20 °C to +60 °C.
The temperature dependence of the cables is specified for screened cables and should be taken
into account for the design of actual cabling systems.
The recommended temperature range during installation should be indicated in the relevant detail
specification.
2 Definitions, materials and cable construction
2.1 Definitions
See 2.1 of IEC 61156-1.
2.2 Materials and cable construction
2.2.1 General remarks
The choice of materials and cable construction shall be suitable for the intended application and
installation of the cable. Particular care shall be taken to meet any special requirements for fire
performance (such as burning properties, smoke generation, evolution of halogen gas, etc.).
A detail specification may be prepared.
2.2.2 Cable construction
The cable construction shall be in accordance with the materials, dimensions and assembly details
given in the relevant detail specification.
2.2.3 Conductor
The conductor shall be a solid annealed copper conductor, in accordance with 2.2.3 of IEC 61156-1,
and shall have a diameter between 0,5 mm and 0,8 mm.
2.2.4 Insulation
The conductor shall be insulated with a suitable thermoplastic material.
Examples of suitable materials are:
– polyolefin;
– fluoropolymer;
– low-smoke zero-halogen thermoplastic material.
The insulation may be solid or cellular with or without a solid dielectric skin. The insulation shall be
continuous and shall have a thickness such that the completed cable meets the specified
requirements. The nominal thickness of the insulation shall be compatible with the method of
conductor termination.
– 6 – 61156-7 IEC:2003+A1:2012
2.2.5 Colour code of insulation
The colour code is not specified but shall be indicated in the relevant detail specification. The
colours shall be readily identifiable and shall correspond reasonably with the standard colours
shown in IEC 60304.
NOTE It is acceptable to mark or stripe the "a" wire with the colour of the "b" wire to facilitate pair identification.
2.2.6 Cable element
The cable element shall be a tested pair.
2.2.7 Screening of the cable element
The screen for the cable element shall be in accordance with 2.2.7 of IEC 61156-1. If a braid is
used, the minimum braid coverage shall be such as to meet the screening requirements of this
standard. The individual components used to screen the cable element shall be in electrical
contact.
2.2.8 Cable make-up
The core of the cable may be protected by wrappings of a non-hygroscopic tape.
2.2.9 Screening of cable core
A screen for the cable core may be provided. The screen shall be in accordance with 2.2.9 of
IEC 61156-1.
2.2.10 Sheath
The sheath material shall consist of a suitable thermoplastic material.
Examples of suitable materials are:
– polyolefin;
– PVC;
– fluoropolymer;
– low-smoke zero-halogen thermoplastic material.
The sheath shall be continuous, having a uniform thickness.
A non-metallic ripcord may be provided. When provided, the ripcord shall be non-hygroscopic.
2.2.11 Colour of sheath
The colour of the sheath is not specified, but it should be stated in the relevant detail specification.
2.2.12 Identification
Each length of cable shall be identified as to the manufacturer and, when indicated in the relevant
detail specification, the year of manufacture, using one of the following methods:
a) appropriately coloured threads or tapes;
b) with a printed tape;
c) printing on the cable core wrapping;
d) marking on the sheath.
61156-7 IEC:2003+A1:2012 – 7 –
Additional markings, such as length marking etc., are permitted on the cable sheath. When used,
such markings should be indicated in the relevant detail specification.
2.2.13 Finished cable
The finished cable shall be adequately protected for storage and shipment.
3 Characteristics and requirements
3.1 General remarks
This clause lists the characteristics and minimum requirements of a cable complying with this
specification. Test methods shall be in accordance with Clause 3 of IEC 61156-1. A detail
specification may be prepared to identify a specific product and its performance capabilities (see
Clause 4).
3.2 Electrical characteristics
The tests shall be carried out on a cable length of not less than 100 m unless otherwise specified.
3.2.1 Conductor resistance
When measured in accordance with 5.1 of IEC 60189-1, the maximum loop-resistance shall not
exceed 17,0 Ω/100 m of cable.
3.2.2 Resistance unbalance
When measured in accordance with 2.1.1 of IEC 61156-1, the resistance unbalance of a pair shall
not exceed 2,0 %.
3.2.3 Dielectric strength
The test shall be performed on conductor/conductor and conductor/screen with 1,0 kV d.c. for
1 min or, alternately, with 2,5 kV d.c. for 2 s. An a.c. voltage may be used. The a.c. voltage levels
in these cases shall be 0,7 kV a.c. for 1 min or, alternately, 1,7 kV a.c. for 2 s.
NOTE When installed in conjunction with power cables, local regulations may require a higher test voltage.
3.2.4 Insulation resistance
The test shall be performed both on
– conductor/conductor;
– conductor/screen.
The minimum insulation resistance at 20 °C shall not be less than 5 000 MΩ⋅km.
3.2.5 Mutual capacitance
The mutual capacitance is not specified but may be indicated in the relevant detail specification.
3.2.6 Capacitance unbalance pair to ground
The maximum capacitance unbalance pair to ground shall not exceed 1 200 pF/km at a frequency
of 1 kHz.
3.2.7 Transfer impedance
The transfer impedance shall not exceed the values listed in Table 1 at the indicated frequencies.
– 8 – 61156-7 IEC:2003+A1:2012
Table 1 – Transfer impedance
Frequency Max. surface transfer impedance
MHz
mΩ/m
1 10
10 10
30 30
100 60
3.2.8 Resistance of the screen
The maximum longitudinal d.c. resistance value of the individual screens or an overall screen is
not specified but may be indicated in the relevant detail specification shall be less than 15 mΩ/m.
3.3 Transmission characteristics
All the tests shall be carried out on a cable length of 100 m unless otherwise specified.
3.3.1 Velocity of propagation, delay and differential delay (delay skew)
3.3.1.1 Velocity of propagation
The minimum velocity of propagation for any screened cable element shall be equal to, or greater
than, 0,6 × c (c is the speed of light in vacuum) for all frequencies between 4 MHz and 1 200 MHz.
NOTE The velocity of propagation, group velocity and phase velocity are approximately equal for frequencies greater
than 4 MHz when measured on symmetric cables, i.e. when the cables are operated in a balanced mode.
3.3.1.2 Delay
The delay for a specified length of cable is understood as the inverse of the velocity of
propagation. The maximum delay shall be less than or equal to:
delay= 500+ [ns/100 m] (1)
f
where f is the frequency in MHz.
3.3.1.3 Differential delay (delay skew)
Differential delay (delay skew) is the difference in delay between any two screened cable elements.
When the delay is measured at –20 °C ± 2 °C, 20 °C ± 3 °C and 60 °C ± 1 °C, the maximum
differential delay (delay skew) at a given temperature shall not be greater than 25,0 ns/100 m in
the frequency range from 4 MHz to 1 200 MHz.
3.3.1.4 Environmental effects
The differential delay (delay skew) due to temperature shall not vary by more than ±10 ns/100 m
over the temperature range from –20 °C to +60 °C while still meeting the differential delay (delay
skew) of 3.3.1.3
61156-7 IEC:2003+A1:2012 – 9 –
3.3.2 Attenuation
The maximum attenuation α of any pair in the frequency range 4,0 MHz to 1 200 MHz shall be
less than, or equal to, the value obtained from equation (2) using the corresponding values of the
constants given in Table 2.
C
α = A× f + B× f + [dB /100m ] (2)
f
Table 2 – Attenuation, constant values
Constants
A B C
1,645 0,01 0,25
The values in Table 3 are for information only.
Table 3 – Attenuation values
Frequency Attenuation at 20 °C
MHz
dB/100 m
4 3,5
10 5,4
16 6,8
31,25 9,6
62,5 13,7
100 17,5
200 25,3
300 31,5
600 46,3
900 58.3
1 000 62,0
1 200 69,0
3.3.2.1 Environmental effects
The increase in attenuation due to elevated temperature shall not be greater than 0,2 %/°C.
NOTE The method for determining compliance with this requirement is under consideration.
3.3.3 Unbalance attenuation
The minimum unbalance attenuation near-end (transverse conversion loss or TCL) shall be equal
to, or greater than, the value obtained from equation (3) for the frequency range from 1 MHz to
200 MHz.
Unbalance attenuation near-end (TCL):
TCL = 40,0 − 10× log ( f) [ dB ] (3)
where f is the frequency in MHz.
NOTE The need for ELTCTL and TCL values above 200 MHz are under consideration.
– 10 – 61156-7 IEC:2003+A1:2012
3.3.4 Near-end crosstalk (NEXT)
When measured in accordance with IEC 61156-1, the worst-pair power-sum near-end crosstalk,
PS NEXT, of any pair for all frequencies in the range 4 MHz to 1 200 MHz shall be equal to, or
greater than, the value obtained from equation (4).
PS NEXT = 103,0 − 15× log ( f) [ dB ] (4)
where f is the frequency in MHz.
The values given in Table 4 are for information only. For those frequencies where the calculated
value of PS NEXT is greater than 75 dB, the requirement shall be 75 dB.
Table 4 – Near-end crosstalk (NEXT)
Frequency PS NEXT
MHz dB
4 75
10 75
16 75
31,25 75
62,5 75
100 73
200 68
300 66
600 61
900 59
1 000 58
1 200 57
3.3.5 Far-end crosstalk (FEXT)
When measured in accordance with IEC 61156-1, the worst pair-to-pair equal-level far-end
crosstalk, PS EL FEXT, of any pair shall not be less than the value obtained from equation (5) for
all frequencies in the range from 4 MHz to 1 200 MHz.
PS EL FEXT ( f ) = 91− 20× log ( f) [ dB ] (5)
where f is the frequency in MHz.
The values given in Table 5 are for information only. For those frequencies where the calculated
value of PS EL FEXT is greater than 75 dB, the requirement shall be 75 dB.
61156-7 IEC:2003+A1:2012 – 11 –
Table 5 – Far-end crosstalk (FEXT)
Frequency PS EL FEXT
MHz dB for 100 m
4 75
10 71
16 67
31,25 61
62,5 55
100 51
200 45
300 41
600 35
900 32
1 000 31
1 200 29
3.3.6 Characteristic impedance
3.3.6.1 Nominal impedance
Unless otherwise specified in the relevant detail specification, the nominal impedance of the cable
shall be 100 Ω.
3.3.6.2 Mean characteristic impedance
When measured in accordance with 3.3.6.3, 3.3.6.3/3.3.6.2.3 or 3.3.6.3/3.3.6.2.3 to 3.3.6.2.5 of
IEC 61156-1, the mean characteristic impedance shall be ±5 % of the nominal impedance at
100 MHz.
3.3.7 Return loss
When measured in accordance with 3.3.7 of IEC 61156-1 the minimum return loss of any pair in
the frequency range indicated in Table 6 shall be greater than the values in Table 6.
Table 6 – Return loss
Frequency range Return loss
MHz dB
4 – 10 20,0 + 5,0 × log (f)
10 – 20 25,0
20 – 250 25,0 – 7,0 × log (f/20)
250 – 600 17,3
600 – 1 200 17,3 – 10 × log (f/600)
3.3.8 Screening attenuation
Screening attenuation is a part of the coupling attenuation. When measured separately, as per
IEC 62153-4-2, the screening attenuation in the frequency range from 30,0 MHz to 1 200 MHz shall
not be less than the 60 dB.
– 12 – 61156-7 IEC:2003+A1:2012
3.3.9 Coupling attenuation
When measured according to IEC 62153-4-2, the coupling attenuation shall be equal to, or greater
than, the values indicated in Table 7.
Table 7 – Coupling attenuation
Frequency range Coupling attenuation
MHz dB
30 - 100 85,0
100 - 1 200 85,0 – 20 × log (f/100 )
3.4 Mechanical and dimensional characteristics and requirements
3.4.1 Dimensional requirements
The nominal thickness of the sheath and the nominal overall diameter of the sheath are not
specified but shall be indicated in the relevant detail specification.
3.4.2 Elongation at break of the conductor
The minimum elongation of the conductor shall be 10 %.
3.4.3 Elongation at break of the insulation
The minimum elongation at break of the insulation shall be 100 %.
3.4.4 Elongation at break of the sheath
The minimum value of the elongation at break of the sheath shall be 100 %.
3.4.5 Tensile strength of the sheath
The minimum tensile strength of the sheath shall be 9 MPa.
3.4.6 Crush test of the cable
The crush test of the cable is not specified but may be indicated in the relevant detail specification.
3.4.7 Impact test of the cable
Not applicable.
3.4.8 Bending under tension
The bending-under-tension test of the cable shall be performed using a diameter of the pulley of
120 mm (under consideration). The requirement shall be stated in the relevant detail specification.
3.4.9 Tensile performance of the cable
During installation, the value of the pulling force shall not exceed 20 N per pair.
61156-7 IEC:2003+A1:2012 – 13 –
3.5 Environmental characteristics
3.5.1 Shrinkage of insulation
When tested at 100 °C ± 2 °C for 1 h, the shrinkage of the insulation shall be less than, or equal
to, 5 %. The length of the sample shall be 150 mm, and the shrink-back shall be measured as the
sum from both ends.
3.5.2 Wrapping test of insulation after thermal ageing
Not applicable.
3.5.3 Bending test of insulation at low temperature
The bending test of the insulated conductor shall be carried out at –20 °C ± 2 °C. The mandrel
diameter shall be 6 mm. There shall be no cracks in the insulation.
3.5.4 Elongation at break of the sheath after ageing
The ageing regime shall be seven days at 100 °C ± 2 °C. The elongation shall not be less than
50 % of the un-aged value.
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