IEC 61156-5:2009

Multicore and symmetrical pair/quad cables for digital communications - Part 5: Symmetrical pair/quad cables with transmission characteristics up to 1 000 MHz - Horizontal floor wiring - Sectional specification

IEC 61156-5:2009(E) describes the cables intended primarily for horizontal floor wiring as defined in ISO/IEC 11801. It covers individually screened, common screened and unscreened pairs or quads. The transmission characteristics and the frequency range of the cables are specified at 20 °C. Those cables are intended to be used to support the delivery of low voltage and power applications such as IEEE 802.3af (Power over Ethernet) and IEEE 802.3at (Power over Ethernet Plus). This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- new requirements for new Cat6A and Cat7A cables;
- revised requirements and tests for Cat5e, Cat6 and Cat7 cables. The contents of the corrigendum of February 2010 have been included in this copy. This publication is to be read in conjunction with IEC 61156-1:2002.

General Information

• Status: Published
• Publication Date: 24-Feb-2009
• ICS: 33.120.20 - Wires and symmetrical cables
• Technical Committee: SC 46C - Wires and symmetric cables
• Drafting Committee: WG 7 - TC 46/SC 46C/WG 7
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 03-Apr-2020

Relations

• Replaces: IEC TS 61873:2001 - State of the art for symmetrical pair/quad cables with transmission characteristics beyond category 5
• Effective Date: 05-Sep-2023
• Amended By: IEC 61156-5:2009/AMD1:2012 - Amendment 1 - Multicore and symmetrical pair/quad cables for digital communications - Part 5: Symmetrical pair/quad cables with transmission characteristics up to 1 000 MHz - Horizontal floor wiring - Sectional specification
• Effective Date: 05-Sep-2023
• Corrected By: IEC 61156-5:2009/COR1:2009 - Corrigendum 1 - Multicore and symmetrical pair/quad cables for digital communications - Part 5: Symmetrical pair/quad cables with transmission characteristics up to 1 000 MHz - Horizontal floor wiring - Sectional specification
• Effective Date: 05-Sep-2023
• Corrected By: IEC 61156-5:2009/COR2:2010 - Corrigendum 2 - Multicore and symmetrical pair/quad cables for digital communications - Part 5: Symmetrical pair/quad cables with transmission characteristics up to 1 000 MHz - Horizontal floor wiring - Sectional specification
• Effective Date: 05-Sep-2023
• Revised: IEC 61156-5:2020 - Multicore and symmetrical pair/quad cables for digital communications - Part 5: Symmetrical pair/quad cables with transmission characteristics up to 1 000 MHz - Horizontal floor wiring - Sectional specification
• Effective Date: 05-Sep-2023
• Revises: IEC 61156-5:2002 - Multicore and symmetrical pair/quad cables for digital communications - Part 5: Symmetrical pair/quad cables with transmission characteristics up to 600 MHz - Horizontal floor wiring - Sectional specification
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 61156-5 ®
Edition 2.0 2009-02
INTERNATIONAL
STANDARD
Multicore and symmetrical pair/quad cables for digital communications –

Part 5: Symmetrical pair/quad cables with transmission characteristics up to
1 000 MHz – Horizontal floor wiring – Sectional 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
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.

IEC Central Office
3, rue de Varembé
CH-1211 Geneva 20
Switzerland
Email: [e-mail]
Web: www.iec.ch
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 corrigenda or an amendment might have been published.
ƒ Catalogue of IEC publications: www.iec.ch/searchpub
The IEC on-line Catalogue enables you to search by a variety of criteria (reference number, text, technical committee,…).
It also gives information on projects, withdrawn and replaced publications.
ƒ IEC Just Published: www.iec.ch/online_news/justpub
Stay up to date on all new IEC publications. Just Published details twice a month all new publications released. Available
on-line and also by email.
ƒ Electropedia: www.electropedia.org
The world's leading online dictionary of electronic and electrical terms containing more than 20 000 terms and definitions
in English and French, with equivalent terms in additional languages. Also known as the International Electrotechnical
Vocabulary online.
ƒ Customer Service Centre: www.iec.ch/webstore/custserv
If you wish to give us your feedback on this publication or need further assistance, please visit the Customer Service
Centre FAQ or contact us:
Email: [e-mail]
Tel.: [phone]
Fax: [phone]
IEC 61156-5 ®
Edition 2.0 2009-02
INTERNATIONAL
STANDARD
Multicore and symmetrical pair/quad cables for digital communications –

Part 5: Symmetrical pair/quad cables with transmission characteristics up to
1 000 MHz-horizontal floor wiring – Sectional specification

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
T
ICS 33.120.20 ISBN 978-2-88910-424-6
– 2 – 61156-5 © IEC:2009(E)
CONTENTS
FOREWORD.5

1 Scope.7

2 Normative references .7

3 Terms and definitions .8

4 Installation considerations .8

4.1 General remarks.8

4.2 Bending radius of installed cable. .8

4.3 Climatic conditions .8
5 Materials and cable construction .8
5.1 General remarks.8
5.2 Cable construction .8
5.2.1 Conductor.8
5.2.2 Insulation.8
5.2.3 Cable element .9
5.2.4 Cable make-up .9
5.2.5 Screening of the cable core .9
5.2.6 Sheath.9
5.2.7 Identification.9
5.2.8 Finished cable .10
6 Characteristics and requirements .10
6.1 General remarks.10
6.2 Electrical characteristics and tests .10
6.2.1 Conductor resistance.10
6.2.2 Resistance unbalance .10
6.2.3 Dielectric strength .10
6.2.4 Insulation resistance.10
6.2.5 Mutual capacitance.10
6.2.6 Capacitance unbalance .10
6.2.7 Transfer impedance.11
6.2.8 Coupling attenuation.11
6.2.9 Current-carrying capacity.11
6.3 Transmission characteristics .11

6.3.1 Velocity of propagation (phase velocity) .11
6.3.2 Phase delay and differential delay (delay skew) .11
6.3.3 Attenuation (α).12
6.3.4 Unbalance attenuation (TCL) .13
6.3.5 Near-end crosstalk (NEXT).13
6.3.6 Far-end crosstalk (FEXT) .14
6.3.7 Alien (exogenous) near-end crosstalk (ANEXT) .14
6.3.8 Alien (exogenous) far-end crosstalk (AFEXT) .14
6.3.9 Alien (exogenous) crosstalk of bundled cables .15
6.3.10 Impedance.15
6.3.11 Return loss (RL) .16
6.4 Mechanical and dimensional characteristics and requirements .16
6.4.1 Dimensional requirements .16
6.4.2 Elongation at break of the conductors.16

61156-5 © IEC:2009(E) – 3 –
6.4.3 Tensile strength of the insulation .17

6.4.4 Elongation at break of the insulation.17

6.4.5 Adhesion of the insulation to the conductor .17

6.4.6 Elongation at break of the sheath .17

6.4.7 Tensile strength of the sheath .17

6.4.8 Crush test of the cable .17

6.4.9 Impact test of the cable .17

6.4.10 Bending under tension.17

6.4.11 Repeated bending of the cable .17

6.4.12 Tensile performance of the cable.17

6.4.13 Shock-test requirements of the cable.17
6.4.14 Bump-test requirements of the cable .17
6.4.15 Vibration-test requirements of a cable .17
6.5 Environmental characteristics.18
6.5.1 Shrinkage of insulation .18
6.5.2 Wrapping test of insulation after thermal ageing .18
6.5.3 Bending test of insulation at low temperature .18
6.5.4 Elongation at break of the sheath after ageing.18
6.5.5 Tensile strength of the sheath after ageing .18
6.5.6 Sheath pressure test at high temperature .18
6.5.7 Cold bend test of the cable .18
6.5.8 Heat shock test.18
6.5.9 Damp heat steady state.18
6.5.10 Solar radiation (UV test) .18
6.5.11 Solvents and contaminating fluids.18
6.5.12 Salt mist and sulphur dioxide.18
6.5.13 Water immersion .19
6.5.14 Hygroscopicity.19
6.5.15 Wicking .19
6.5.16 Flame propagation characteristics of a single cable.19
6.5.17 Flame propagation characteristics of bunched cables .19
6.5.18 Halogen gas evolution .19
6.5.19 Smoke generation .19
6.5.20 Toxic gas emission .19
6.5.21 Integrated fire test .19

7 Category 5e multipair cable .19
7.1 General .19
7.2 Transmission.19
8 Introduction to the blank detail specification .20

Annex A (informative) Acronyms for common cable constructions .21

Bibliography.23

Figure 1 – Impedance template.16
Figure A.1 – Common cable construction examples .22

– 4 – 61156-5 © IEC:2009(E)
Table 1 – Cable categories .7

Table 2 – Transfer impedance .11

Table 3 – Coupling attenuation .11

Table 4 – Attenuation equation constants .12

Table 5 – Near-end unbalance attenuation.13

Table 6 – Worst-pair PS NEXT(1) values .13

Table 7 – Worst-pair PS EL FEXT(1) values .14

Table 8 – PS ANEXT .14

Table 9 – PS AACR-F.15
Table 10 – Return loss.16
Table A.1 – Cable construction acronyms .21
...

IEC 61156-5 ®
Edition 2.1 2012-12
INTERNATIONAL
STANDARD
colour
inside
Multicore and symmetrical pair/quad cables for digital communications –
Part 5: Symmetrical pair/quad cables with transmission characteristics up to
1 000 MHz – Horizontal floor wiring – Sectional 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
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.

IEC Central Office Tel.: [phone]
3, rue de Varembé Fax: [phone]

CH-1211 Geneva 20 [e-mail]
Switzerland www.iec.ch
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 corrigenda or an amendment might have been published.

Useful links:
IEC publications search - www.iec.ch/searchpub Electropedia - www.electropedia.org
The advanced search enables you to find IEC publications The world's leading online dictionary of electronic and
by a variety of criteria (reference number, text, technical electrical terms containing more than 30 000 terms and
committee,…). definitions in English and French, with equivalent terms in
It also gives information on projects, replaced and additional languages. Also known as the International
withdrawn publications. Electrotechnical Vocabulary (IEV) on-line.

IEC Just Published - webstore.iec.ch/justpublished Customer Service Centre - webstore.iec.ch/csc
Stay up to date on all new IEC publications. Just Published If you wish to give us your feedback on this publication
details all new publications released. Available on-line and or need further assistance, please contact the
also once a month by email. Customer Service Centre: [e-mail].

IEC 61156-5 ®
Edition 2.1 2012-12
INTERNATIONAL
STANDARD
colour
inside
Multicore and symmetrical pair/quad cables for digital communications –

Part 5: Symmetrical pair/quad cables with transmission characteristics up to

1 000 MHz – Horizontal floor wiring – Sectional specification

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.120.20 ISBN 978-2-8322-0561-7

– 2 – 61156-5  IEC:2009+A1:2012(E)

CONTENTS
FOREWORD . 5

1 Scope . 7

2 Normative references . 7

3 Terms and definitions . 8

4 Installation considerations . 8

4.1 General remarks. 8

4.2 Bending radius of installed cable. . 8

4.3 Climatic conditions . 8
5 Materials and cable construction . 8
5.1 General remarks. 8
5.2 Cable construction . 8
5.2.1 Conductor . 8
5.2.2 Insulation. 8
5.2.3 Cable element . 9
5.2.4 Cable make-up . 9
5.2.5 Screening of the cable core . 9
5.2.6 Sheath . 9
5.2.7 Identification . 9
5.2.8 Finished cable . 10
6 Characteristics and requirements . 10
6.1 General remarks. 10
6.2 Electrical characteristics and tests . 10
6.2.1 Conductor resistance . 10
6.2.2 Resistance unbalance . 10
6.2.3 Dielectric strength . 10
6.2.4 Insulation resistance . 10
6.2.5 Mutual capacitance . 10
6.2.6 Capacitance unbalance . 10
6.2.7 Transfer impedance . 11
6.2.8 Coupling attenuation . 11
6.2.9 Current-carrying capacity. 12
6.3 Transmission characteristics . 12

6.3.1 Velocity of propagation (phase velocity) . 12
6.3.2 Phase delay and differential delay (delay skew) . 12
6.3.3 Attenuation (α) . 12
6.3.4 Unbalance attenuation (TCL) . 13
6.3.5 Near-end crosstalk (NEXT) . 14
6.3.6 Far-end crosstalk (FEXT) . 14
6.3.7 Alien (exogenous) near-end crosstalk (ANEXT) . 15
6.3.8 Alien (exogenous) far-end crosstalk (AFEXT) . 15
6.3.9 Alien (exogenous) crosstalk of bundled cables . 16
6.3.10 Impedance. 16
6.3.11 Return loss (RL) . 17
6.4 Mechanical and dimensional characteristics and requirements . 17
6.4.1 Dimensional requirements . 17
6.4.2 Elongation at break of the conductors . 18

61156-5  IEC:2009+A1:2012(E) – 3 –

6.4.3 Tensile strength of the insulation . 18

6.4.4 Elongation at break of the insulation . 18

6.4.5 Adhesion of the insulation to the conductor . 18

6.4.6 Elongation at break of the sheath . 18

6.4.7 Tensile strength of the sheath . 18

6.4.8 Crush test of the cable . 18

6.4.9 Impact test of the cable . 18

6.4.10 Bending under tension . 18

6.4.11 Repeated bending of the cable . 18

6.4.12 Tensile performance of the cable . 18

6.4.13 Shock-test requirements of the cable . 18
6.4.14 Bump-test requirements of the cable . 18
6.4.15 Vibration-test requirements of a cable . 19
6.5 Environmental characteristics . 19
6.5.1 Shrinkage of insulation . 19
6.5.2 Wrapping test of insulation after thermal ageing . 19
6.5.3 Bending test of insulation at low temperature . 19
6.5.4 Elongation at break of the sheath after ageing . 19
6.5.5 Tensile strength of the sheath after ageing . 19
6.5.6 Sheath pressure test at high temperature . 19
6.5.7 Cold bend test of the cable . 19
6.5.8 Heat shock test. 19
6.5.9 Damp heat steady state . 19
6.5.10 Solar radiation (UV test) . 19
6.5.11 Solvents and contaminating fluids . 19
6.5.12 Salt mist and sulphur dioxide . 20
6.5.13 Water immersion . 20
6.5.14 Hygroscopicity . 20
6.5.15 Wicking . 20
6.5.16 Flame propagation characteristics of a single cable . 20
6.5.17 Flame propagation characteristics of bunched cables . 20
6.5.18 Halogen gas evolution . 20
6.5.19 Smoke generation . 20
6.5.20 Toxic gas emission . 20
6.5.21 Integrated fire test . 20

7 Category 5e multipair cable . 20
7.1 General . 20
7.2 Transmission . 21
8 Introduction to the blank detail specification . 21

Annex A (informative) Acronyms for common cable constructions . 22

Bibliography . 24

Figure 1 – Impedance template . 17
Figure A.1 – Common cable construction examples . 23

– 4 – 61156-5  IEC:2009+A1:2012(E)

Table 1 – Cable categories . 7

Table 2 – Transfer impedance . 11

Table 3 – Coupling attenuation . 11

Table 4 – Attenuation equation constants . 13

Table 5 – Near-end unbalance attenuation . 14

Table 6 – Worst-pair PS NEXT(1) values . 14

Table 7 – Worst-pair PS EL FEXT(1) values . 15

Table 8 – PS ANEXT . 15

Table 9 – PS AACR-F .
...