Multicore and symmetrical pair/quad cables for digital communications - Part 12: Symmetrical single pair cables with transmission characteristics up to 600 MHz - Work area wiring - Sectional specification

IEC 61156-12:2021 describes cables intended to be used for transmission of 1 Gbit/s over a single twisted pair for office, home and industrial application. An example of an existing application is 1000BASE-T1; see ISO/IEC TR 11801-9906. The transmission characteristics of these cables are specified up to a frequency of 600 MHz and at a temperature of 20 °C. The cable type recognised is intended to be used for the work area wiring of shielded channels with a nominal length of 40 m. Possible designs are U/FTP, X/UTP and X/FTP, where X stands for F, S or SF.
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, e.g. the electric power supplies of public utility mains, they are intended to be used to support the delivery of low voltage remote powering applications.

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Status
Published
Publication Date
13-Jan-2021
Current Stage
PPUB - Publication issued
Completion Date
14-Jan-2021
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IEC 61156-12:2021 - Multicore and symmetrical pair/quad cables for digital communications - Part 12: Symmetrical single pair cables with transmission characteristics up to 600 MHz - Work area wiring - Sectional specification
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IEC 61156-12
Edition 1.0 2021-01
INTERNATIONAL
STANDARD
Multicore and symmetrical pair/quad cables for digital communications –
Part 12: Symmetrical single pair cables with transmission characteristics up to
600 MHz – Work area wiring – Sectional specification
IEC 61156-12:2021-01(en)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61156-12
Edition 1.0 2021-01
INTERNATIONAL
STANDARD
Multicore and symmetrical pair/quad cables for digital communications –
Part 12: Symmetrical single pair cables with transmission characteristics up to
600 MHz – Work area wiring – Sectional specification
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.120.20 ISBN 978-2-8322-9230-3

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

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC 61156-12:2021 © IEC 2021
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 .................................................................................................. 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 .................................................................................................................... 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 ...................................................................................... 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 ................................................................................................... 12

6.3.3 Attenuation (α) ............................................................................................... 12

6.3.4 Unbalance attenuation (TCL and ELTCTL) ...................................................... 13

6.3.5 Alien (exogenous) near-end crosstalk (PS ANEXT) ......................................... 13

6.3.6 Alien (exogenous) far-end crosstalk (PS AACR-F) ........................................... 14

6.3.7 Alien (exogenous) crosstalk of bundled cables .............................................. 14

6.3.8 Impedance ..................................................................................................... 14

6.3.9 Return loss (RL) ............................................................................................. 14

6.4 Mechanical and dimensional characteristics and requirements .............................. 15

6.4.1 Dimensional requirements ............................................................................. 15

6.4.2 Elongation at break of the conductor.............................................................. 15

6.4.3 Tensile strength of the insulation ................................................................... 15

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IEC 61156-12:2021 © IEC 2021 – 3 –

6.4.4 Elongation at break of the insulation .............................................................. 15

6.4.5 Adhesion of the insulation to the conductor .................................................... 15

6.4.6 Elongation at break of the sheath .................................................................. 15

6.4.7 Tensile strength of the sheath ........................................................................ 15

6.4.8 Crush test of the cable ................................................................................... 15

6.4.9 Impact test of the cable ................................................................................. 15

6.4.10 Bending under tension ................................................................................... 16

6.4.11 Repeated bending of the cable ...................................................................... 16

6.4.12 Tensile performance of the cable ................................................................... 16

6.4.13 Shock-test requirements of the cable ............................................................. 16

6.4.14 Bump-test requirements of the cable ............................................................. 16

6.4.15 Vibration-test requirements of a cable ........................................................... 16

6.5 Environmental characteristics ............................................................................... 16

6.5.1 Shrinkage of insulation .................................................................................. 16

6.5.2 Wrapping test of insulation after thermal ageing ............................................ 16

6.5.3 Bending test of insulation at low temperature ................................................. 16

6.5.4 Elongation at break of the sheath after ageing ............................................... 16

6.5.5 Tensile strength of the sheath after ageing .................................................... 16

6.5.6 Sheath pressure test at high temperature ...................................................... 16

6.5.7 Cold bend test of the cable ............................................................................ 17

6.5.8 Heat shock test .............................................................................................. 17

6.5.9 Damp heat steady state ................................................................................. 17

6.5.10 Solar radiation (UV test) ................................................................................ 17

6.5.11 Solvents and contaminating fluids .................................................................. 17

6.5.12 Salt mist and sulphur dioxide ......................................................................... 17

6.5.13 Water immersion ........................................................................................... 17

6.5.14 Hygroscopicity ............................................................................................... 17

6.5.15 Wicking.......................................................................................................... 17

6.5.16 Flame propagation characteristics of a single cable ....................................... 17

6.5.17 Flame propagation characteristics of bunched cables .................................... 17

6.5.18 Halogen gas evolution ................................................................................... 17

6.5.19 Smoke generation .......................................................................................... 17

6.5.20 Toxic gas emission ........................................................................................ 18

6.5.21 Integrated fire test method for cables in environmental air handling

spaces ........................................................................................................... 18

7 Bundled cable requirements .......................................................................................... 18

7.1 General ................................................................................................................. 18

7.2 Single pairs sharing one sheath ............................................................................ 18

7.2.1 General ......................................................................................................... 18

7.2.2 Near-end crosstalk (NEXT) ............................................................................. 18

7.2.3 Attenuation to crosstalk ratio far-end (PS ACR-F) ........................................... 18

Annex A (informative) Blank detail specification ................................................................... 20

Bibliography .......................................................................................................................... 25

Table 1 – Transfer impedance .............................................................................................. 11

Table 2 – Coupling attenuation ............................................................................................. 12

Table 3 – Attenuation equation constants ............................................................................. 13

Table 4 – TCL requirements .................................................................................................. 13

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– 4 – IEC 61156-12:2021 © IEC 2021

Table 5 – ELTCTL requirements ............................................................................................ 13

Table 6 – PS ANEXT requirements ......................................................................................... 14

Table 7 – PS AACR-F requirements ....................................................................................... 14

Table 8 – RL requirements .................................................................................................... 15

Table 9 – NEXT and PS NEXT requirements ........................................................................... 18

Table 10 – ACR-F and PS ACR-F requirements ...................................................................... 19

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IEC 61156-12:2021 © IEC 2021 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MULTICORE AND SYMMETRICAL PAIR/QUAD CABLES
FOR DIGITAL COMMUNICATIONS –
Part 12: Symmetrical single pair cables with transmission characteristics
up to 600 MHz – Work area wiring – Sectional specification
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.

International Standard IEC 61156-12 has been prepared by subcommittee 46C: Wires and

symmetric cables, of IEC technical committee 46: Cables, wires, waveguides, RF connectors,

RF and microwave passive components and accessories.
The text of this International Standard is based on the following documents:
CDV Report on voting
46C/1136/CDV 46C/1152/RVC

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

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– 6 – IEC 61156-12:2021 © IEC 2021

A list of all parts in the IEC 61156 series, published under the general title Multicore and

symmetrical pair/quad cables for digital communications, can be found on the IEC website.

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

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

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
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IEC 61156-12:2021 © IEC 2021 – 7 –
MULTICORE AND SYMMETRICAL PAIR/QUAD CABLES
FOR DIGITAL COMMUNICATIONS –
Part 12: Symmetrical single pair cables with transmission characteristics
up to 600 MHz – Work area wiring – Sectional specification
1 Scope

This part of IEC 61156 describes cables intended to be used for transmission of 1 Gbit/s over

a single twisted pair for office, home and industrial application. An example of an existing

application is 1000BASE-T1; see ISO/IEC TR 11801-9906. The transmission characteristics of

these cables are specified up to a frequency of 600 MHz and at a temperature of 20 °C. The

cable type recognised is intended to be used for the work area wiring of shielded channels

with a nominal length of 40 m. Possible designs are U/FTP, X/UTP and X/FTP, where X

stands for F, S or SF.

These cables can comprise more than one pair in case several systems are operated in

parallel. In this case, refer to Clause 7 of this document.

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, e.g. the electric power supplies of public

utility mains, they are intended to be used to support the delivery of low voltage remote

powering applications.

Annex A provides a blank detail specification (BDS) that can be used to summarize design

and performance requirements agreed upon between the supplier and the user of a specific

cable type.
2 Normative references

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

content constitutes requirements of this document. For dated references, only the edition

cited applies. For undated references, the latest edition of the referenced document (including

any amendments) applies.

IEC 60708, Low-frequency cables with polyolefin insulation and moisture barrier polyolefin

sheath

IEC 61156-1:2007, Multicore and symmetrical pair/quad cables for digital communications –

Part 1: Generic specification
IEC 61156-1:2007/AMD1:2009

IEC 62153-4-3, Metallic communication cable test methods – Part 4-3: Electromagnetic

compatibility (EMC) – Surface transfer impedance – Triaxial method

IEC 62153-4-5, Metallic communication cables test methods – Part 4-5: Electromagnetic

compatibility (EMC) – Coupling or screening attenuation – Absorbing clamp method
___________

A consolidated edition 3.1 of this publication exists, comprising IEC 61156-1:2007 and IEC 61156-

1:2007/AMD1:2009.
---------------------- Page: 9 ----------------------
– 8 – IEC 61156-12:2021 © IEC 2021

IEC 62153-4-9, Metallic communication cable test methods – Part 4-9: Electromagnetic

compatibility (EMC) – Coupling attenuation of screened balanced cables, triaxial method

ISO/IEC TS 29125:2017, Information technology – Telecommunications cabling requirements

for remote powering of terminal equipment
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 61156-1:2007 and

in IEC 61156-1:2007/AMD1:2009 apply.

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

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

Installation area considerations are defined in Clause 4 of IEC 61156-1:2007. Other areas

may be considered.
4.2 Bending radius of installed cable

The maximum value of the minimum bending radius shall be four times the cable diameter

unless otherwise specified.
4.3 Climatic conditions

Under static conditions, the cable shall operate at least in the temperature range of the

environment from −20 °C to +60 °C.

The attenuation increase due to the elevated operating temperature (temperature of the

environment) is described in 6.3.3.2.

In the case of application of remote powering, the maximum temperature of the conductor

shall not exceed the maximum operation temperature under static conditions in order to

maintain the integrity of the dielectric material performance which is aligned to environmental

temperature range.

Extended temperature ranges are permitted and may be specified in the relevant detail

specification.
5 Materials and cable construction
5.1 General remarks

The choice of materials and cable construction shall be suitable for the intended application

and installation of the cable and in line with the requirements of IEC 61156-1:2007. Particular

care shall be taken to meet any requirements for EMC and fire performance (such as burning

properties, smoke generation, evolution of halogen gas).
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IEC 61156-12:2021 © IEC 2021 – 9 –
5.2 Cable construction

The cable construction shall be in accordance with the details and dimensions given in the

relevant detail specification.
5.3 Conductor

The conductor shall be a stranded or solid annealed copper conductor in accordance with

5.2.1 of IEC 61156-1:2007 and should have a nominal diameter between 0,4 mm and
0,65 mm. A conductor diameter of up to 1,0 mm may be used.
5.4 Insulation

The conductor shall be insulated with a suitable material. Examples of suitable materials are

– polyolefin,
– fluoropolymer, and
– low-smoke zero-halogen thermoplastic material.

The colour code shall be in accordance with IEC 60708 if not specified differently in the

relevant detail specification.
5.5 Cable element

The cable element shall be a pair and shall be twisted. The entire cable may comprise more

than one cable element, see 6.3.5 and Clause 7.
5.6 Screening of the cable element

When required, the screen for the cable element shall be in accordance with 5.2.3.2 of

IEC 61156-1:2007.
5.7 Cable make-up

Spacers may be used in the cable elements and to separate cable elements. The cable

elements and their screens, in case they are screened, may be covered by an intermediate

jacket. This jacket shall be in accordance with 5.9 of this document. The core of the cable

may be wrapped with a protective layer of non-hygroscopic and non-wicking material.

5.8 Screening of the cable core

When required, a screen for the cable core shall be provided. The screen shall be in

accordance with 5.2.5 of IEC 61156-1:2007.
5.9 Sheath

The sheath material shall consist of a suitable material. Examples of suitable materials are

– polyolefin,
– PVC,
– fluoropolymer, and
– low-smoke zero-halogen thermoplastic material.

The sheath shall be continuous, having a thickness as uniform as possible. A non-metallic

ripcord may be provided. When provided, the ripcord shall be non-hygroscopic and non-

wicking.

The colour of the sheath is not specified but it should be specified in the relevant detail

specification
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– 10 – IEC 61156-12:2021 © IEC 2021
5.10 Identification

Each length of cable shall be identified as to the supplier and, when required, a traceability

code, using one of the following methods:
– appropriately coloured threads or tapes;
– a printed tape;
– printing on the cable core wrapping;
– marking on the sheath.

Additional markings, such as length marking, are permitted. If used, such markings shall refer

to this document.
5.11 Finished cable
The finished cable shall be adequately protected for storage and shipment.
6 Characteristics and requirements
6.1 General remarks

Clause 6 lists the characteristics and minimum requirements of a cable complying with this

document. Test methods shall be in accordance with Clause 6 of IEC 61156-1:2007 and

IEC 61156-1:2007/AMD1:2009, except for the length of the cable under test which shall be as

specified in Clause 6 of this document.

The computed requirements in dB, rounded to one decimal place, shall be used to determine

compliance.

The tests for electrical characteristics according to 6.2 shall be carried out on a cable length

of not less than 100 m, unless otherwise specified.

The tests for transmission characteristics according to 6.3 shall be carried out on a cable

length of 100 m, unless otherwise specified. For a better accuracy in high frequencies, the

cable length may be reduced to 50 m unless the test is performed with very sensitive test

equipment.
6.2 Electrical characteristics and tests
6.2.1 Conductor resistance

The maximum conductor resistance at or corrected to 20 °C shall not exceed 145 Ω/km.

6.2.2 Resistance unbalance
6.2.2.1 Resistance unbalance within a pair
The resistance unbalance shall not exceed 2,0 %.
6.2.2.2 Resistance unbalance between pairs
Not applicable.
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IEC 61156-12:2021 © IEC 2021 – 11 –
6.2.3 Dielectric strength

There shall be no failures when a test is performed on conductor/conductor and, where

screen(s) are present, a conductor/screen with 1,0 kV DC for 1 min or, alternatively, with

2,5 kV DC for 2 s. An AC voltage may be used. The AC voltage levels in these cases shall be

0,7 kV AC for 1 min or, alternatively, 1,7 kV AC for 2 s.
6.2.4 Insulation resistance
The test shall be performed on:
– conductor/conductor;
– conductor/screen.

The minimum insulation resistance at or corrected to 20 °C shall be not less than 5 GΩ·km.

6.2.5 Mutual capacitance

The mutual capacitance is not specified but may be indicated in the relevant detail

specification.
6.2.6 Capacitance unbalance

The maximum capacitance unbalance pair to ground shall not exceed 1 600 pF/km at a

frequency of 800 Hz or 1 000 Hz.
6.2.7 Transfer impedance
Two grade
...

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