IEC 61156-11:2023

Multicore and symmetrical pair/quad cables for digital communications - Part 11: Symmetrical single pair cables with transmission characteristics up to 1,25 GHz - Horizontal floor wiring - Sectional specification

IEC 61156-11:2023 describes cables intended to be used for single balanced pair (office, home, industrial) applications according to ISO/IEC 11801-1. An example of existing application is 1000BASE-T1, see ISO/IEC TR 11801-9906. The transmission characteristics of these cables are specified up to a frequency of 1,25 GHz and at a temperature of 20 °C. The T1-C type cable is specified up to 600 MHz, the T1-D type cable up to 1,25 GHz. Depending on the MICE environment and the installation conditions either unscreened or screened cables can be used. A blank detail specification can be found in Annex A.

General Information

• Status: Published
• Publication Date: 01-May-2023
• 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: PPUB - Publication issued
• Start Date: 02-Jun-2023
• Completion Date: 02-May-2023

Relations

• Revises: IEC 61156-11:2019 - Multicore and symmetrical pair/quad cables for digital communications - Part 11: Symmetrical single pair cables with transmission characteristics up to 600 MHz - Horizontal floor wiring - Sectional specification
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 61156-11 ®
Edition 2.0 2023-05
INTERNATIONAL
STANDARD
Multicore and symmetrical pair/quad cables for digital communications –
Part 11: Symmetrical single pair cables with transmission characteristics up to
1,25 GHz – 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 Secretariat Tel.: [phone]
3, rue de Varembé [e-mail]
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.

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further assistance, please contact the Customer Service
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IEC 61156-11 ®
Edition 2.0 2023-05
INTERNATIONAL
STANDARD
Multicore and symmetrical pair/quad cables for digital communications –

Part 11: Symmetrical single pair cables with transmission characteristics up to

1,25 GHz – Horizontal floor wiring – Sectional specification

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.120.20 ISBN 978-2-8322-6938-1

– 2 – IEC 61156-11:2023 © IEC 2023
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
5.3 Conductor . 9
5.4 Insulation . 9
5.5 Cable element . 9
5.6 Screening of the cable element . 9
5.7 Cable make-up. 9
5.8 Screening of the cable core . 9
5.9 Sheath . 9
5.10 Identification . 10
5.11 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 . 11
6.2.4 Insulation resistance . 11
6.2.5 Mutual capacitance . 11
6.2.6 Capacitance unbalance . 11
6.2.7 Transfer impedance . 11
6.2.8 Coupling attenuation and low frequency 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) . 13
6.3.4 Unbalance attenuation (TCL and EL TCTL). 14
6.3.5 Alien (exogenous) near-end crosstalk (PS ANEXT) . 14
6.3.6 Alien (exogenous) far-end crosstalk (PS AACR-F) . 15
6.3.7 Alien (exogenous) crosstalk of bundled cables . 15
6.3.8 Impedance . 15
6.3.9 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 conductor. 16
6.4.3 Tensile strength of the insulation . 16

6.4.4 Elongation at break of the insulation . 16
6.4.5 Adhesion of the insulation to the conductor . 16
6.4.6 Elongation at break of the sheath . 16
6.4.7 Tensile strength of the sheath . 16
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 . 17
6.5.1 Shrinkage of the insulation . 17
6.5.2 Wrapping test of the insulation after thermal ageing . 17
6.5.3 Bending test of insulation at low temperature . 17
6.5.4 Elongation at break of the sheath after ageing . 17
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 . 18
6.5.11 Solvents and contaminating fluids . 18
6.5.12 Salt mist and sulphur dioxide . 18
6.5.13 Water immersion . 18
6.5.14 Hygroscopicity . 18
6.5.15 Wicking. 18
6.5.16 Flame propagation characteristics of a single cable . 18
6.5.17 Flame propagation characteristics of bunched cables . 18
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 method for cables in environmental air handling
spaces . 19
7 Bundled cable requirements . 19
7.1 General . 19
7.2 Single pairs sharing one sheath . 19
7.2.1 General . 19
7.2.2 Near-end crosstalk (NEXT) . 19
7.2.3 Attenuation to crosstalk ratio far-end (PS ACR-F) . 20
Annex A (informative) Blank detail specification . 21
Annex B (informative) Background information for coupling attenuation and low

frequency coupling attenuation requirements . 26
Bibliography . 27

Table 1 – Transfer impedance . 11
Table 2 – Coupling attenuation . 12

– 4 – IEC 61156-11:2023 © IEC 2023
Table 3 – Low frequency coupling attenuation . 12
Table 4 – Attenuation equation constants . 13
Table 5 – TCL requirements . 14
Table 6 – EL TC
...

IEC 61156-11 ®
Edition 2.0 2023-05
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Multicore and symmetrical pair/quad cables for digital communications –
Part 11: Symmetrical single pair cables with transmission characteristics
up to 600 MHz 1,25 GHz – 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 Secretariat Tel.: [phone]
3, rue de Varembé [e-mail]
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
variety of criteria (reference number, text, technical publications previews. With a subscription you will always have
committee, …). It also gives information on projects, replaced access to up to date content tailored to your needs.
and withdrawn publications.
Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished
The world's leading online dictionary on electrotechnology,
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.
IEC Customer Service Centre - webstore.iec.ch/csc

If you wish to give us your feedback on this publication or need
further assistance, please contact the Customer Service
Centre: [e-mail].
IEC 61156-11 ®
Edition 2.0 2023-05
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Multicore and symmetrical pair/quad cables for digital communications –
Part 11: Symmetrical single pair cables with transmission characteristics
up to 600 MHz 1,25 GHz – Horizontal floor wiring – Sectional specification
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.120.20 ISBN 978-2-8322-6984-8
– 2 – IEC 61156-11:2023 RLV © IEC 2023
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 . 9
5.1 General remarks . 9
5.2 Cable construction . 9
5.3 Conductor . 9
5.4 Insulation . 9
5.5 Cable element . 9
5.6 Screening of the cable element . 9
5.7 Cable make-up. 9
5.8 Screening of the cable core . 9
5.9 Sheath . 10
5.10 Identification . 10
5.11 Finished cable . 10
6 Characteristics and requirements . 10
6.1 General remarks . 10
6.2 Electrical characteristics and tests . 11
6.2.1 Conductor resistance . 11
6.2.2 Resistance unbalance. 11
6.2.3 Dielectric strength . 11
6.2.4 Insulation resistance . 11
6.2.5 Mutual capacitance . 11
6.2.6 Capacitance unbalance . 11
6.2.7 Transfer impedance . 11
6.2.8 Coupling attenuation and low frequency coupling attenuation . 12
6.2.9 Current-carrying capacity . 13
6.3 Transmission characteristics . 13
6.3.1 Velocity of propagation (phase velocity) . 13
6.3.2 Phase delay and differential delay (delay skew) . 13
6.3.3 Attenuation (α) . 13
6.3.4 Unbalance attenuation (TCL and EL TCTL). 14
6.3.5 Alien (exogenous) near-end crosstalk (PS ANEXT) . 16
6.3.6 Alien (exogenous) far-end crosstalk (PS AACR-F) . 16
6.3.7 Alien (exogenous) crosstalk of bundled cables . 17
6.3.8 Impedance . 17
6.3.9 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 conductor. 18
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 the insulation . 19
6.5.2 Wrapping test of the 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 . 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 method for cables in environmental air handling
spaces . 21
7 Bundled cable requirements . 21
7.1 General . 21
7.2 Single pairs sharing one sheath . 21
7.2.1 General . 21
7.2.2 Near-end crosstalk (NEXT) . 21
7.2.3 Attenuation to crosstalk ratio far-end (PS ACR-F) . 22
Annex A (informative) Blank detail specification . 23
Annex B (informative) Background information for coupling attenuation and low

frequency coupling attenuation requirements . 28
Bibliography . 29

Table 1 – Transfer impedance . 12
Table 2 – Coupling attenuation . 12

– 4 – IEC 61156-11:2023 RLV © IEC 2023
Table 3 – Low frequency coupling attenuation . 13
Table 4 – Attenuation equation constants . 14
Table 5 – TCL requirements . 15
Table 6 – EL TCTL requirements .
...