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

IEC 61156-11:2019 describes cables intended to be used for transmission of 1 Gbps over a single twisted pair for office, home and industrial application. 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 600 MHz and at a temperature of 20 °C. The cable type recognised is intended to be used for 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. A blank detail specification can be found in Annex A. These cables can comprise more than one pair in the event that 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, for example, the electric power supplies of public utility mains, they are intended to be used to support the delivery of low-voltage remote powering applications.

General Information

• Status: Published
• Publication Date: 05-May-2019
• 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
• Start Date: 02-May-2023
• Completion Date: 26-Feb-2021

Relations

• Revised: 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
• Effective Date: 05-Sep-2023

Overview

IEC 61156-11:2019 is the IEC sectional specification for symmetrical single‑pair cables intended for horizontal floor wiring with transmission characteristics up to 600 MHz. It defines cable constructions and test requirements for single twisted‑pair cables designed to support 1 Gbps over a single pair (example application: 1000BASE‑T1, see ISO/IEC TR 11801‑9906). The standard addresses shielded channel use (nominal channel length 40 m) and allows multiple pairs in one sheath when parallel systems are used. A blank detail specification is provided in Annex A.

Key topics and technical requirements

IEC 61156‑11 covers materials, construction, electrical, mechanical and environmental performance, including:

• Cable types and constructions: permitted designs include U/FTP, X/UTP and X/FTP (where X = F, S or SF).
• Electrical characteristics and tests: conductor resistance, resistance unbalance, dielectric strength, insulation resistance, mutual capacitance, capacitance unbalance.
• High‑frequency transmission metrics up to 600 MHz: attenuation, phase/velocity of propagation, delay skew, characteristic impedance, return loss.
• Crosstalk and shielding performance: transfer impedance, coupling attenuation, unbalance attenuation (TCL and EL TCTL), alien near‑end/far‑end crosstalk (PS ANEXT, PS AACR‑F) and bundled‑cable crosstalk behavior.
• Mechanical and durability tests: bending radius, tensile, elongation, crush, impact, shock, vibration and repeated bending.
• Environmental tests: thermal ageing, cold bend, heat shock, damp heat, UV/solar radiation, solvents, salt mist, water immersion, wicking, flame propagation, halogen gas, smoke and toxic gas emission.
• Operational constraints: specified at 20 °C; intended for voltages/currents normally found in communications systems (not for mains low‑impedance sources) and supports low‑voltage remote powering.

Practical applications and users

Who uses IEC 61156‑11:

• Cable manufacturers and R&D teams designing single‑pair shielded cables for 1 Gbps applications
• Test laboratories and QA teams performing certification and compliance testing to IEC 61156‑11
• System integrators, network designers and spec writers deploying horizontal floor wiring in offices, homes and industrial sites
• Product managers and standards engineers specifying physical media for automotive‑grade or industrial single‑pair Ethernet (where applicable) Practical applications include structured horizontal cabling for high‑speed single‑pair Ethernet links, short shielded channels (≈40 m), and installations requiring remote low‑voltage powering.

Related standards

• IEC 61156 series (other parts covering multicore and pair/quad cables)
• ISO/IEC TR 11801‑9906 (example application: 1000BASE‑T1 / single‑pair Ethernet)
• Refer to the normative references in IEC 61156‑11 for full test method cross‑references.

For manufacturers and installers, IEC 61156‑11 provides the test methods and sectional specification needed to deliver reliable single‑pair, high‑bandwidth horizontal cabling.

Standards Content (Sample)

IEC 61156-11 ®
Edition 1.0 2019-05
INTERNATIONAL
STANDARD
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

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IEC 61156-11 ®
Edition 1.0 2019-05
INTERNATIONAL
STANDARD
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

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.120.20 ISBN 978-2-8322-6678-6

– 2 – IEC 61156-11:2019 © IEC 2019

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 and differential delay (delay skew) . 12
6.3.3 Attenuation (α) . 12
6.3.4 Unbalance attenuation (TCL and EL TCTL) . 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

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 the insulation . 16
6.5.2 Wrapping test of the 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 . 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 . 18
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) . 19
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

– 4 – IEC 61156-11:2019 © IEC 2019
Table 5 – EL TCTL 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

INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
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

FOREWORD
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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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 61156-11 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:
FDIS Report on voting
46C/1118/FDIS 46C/1123/RVD
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.

– 6 – IEC 61156-11:2019 © IEC 2019
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
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.
A bilingual version of this publication may be issued at a later date.

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

1 Scope
This part of IEC 61156 describes cables intended to be used for transmission of 1 Gbps over
a single twisted pair for office, home and industrial application. 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 600 MHz and at a temperature of 20 °C.
The cable type recognised is intended to be used for 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. A
blank detail specification can be found in Annex A.
These cables can comprise more than one pair in the event that 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, for example, the electric power supplies of
public utility mains, they are intended to be used to support the delivery of low-voltage remote
powering applications.
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 60708:2005, 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 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 62153-4-3:2013, Metallic communication cable test methods – Part 4-3: Electromagnetic
compatibility (EMC) – Surface transfer impedance – Triaxial method
__________
Under consideration.
A consolidated version of this publication exists, comprising IEC 61156-1:2007 and
IEC 61156-1:2007/AMD1:2009.
– 8 – IEC 61156-11:2019 © IEC 2019
IEC 62153-4-5:2006, Metallic communication cables test methods – Part 4-5: Electromagnetic
compatibility (EMC) – Coupling or screening attenuation – Absorbing clamp method
IEC 62153-4-9:2018, 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 standardisation 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 minimum bending radius of the cable shall be equal to or less than 4 times the outside
diameter of the cable 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
For the purposes of this document, the requirements of Clause 5 of IEC 61156-5:2009 apply.

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. Particular care
shall be taken to meet any requirements for EMC and fire performance (such as burning
properties, smoke generation, evolution of halogen gas).
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 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;
– 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
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, if 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
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;
– low-smoke zero-halogen thermoplastic material.

– 10 – IEC 61156-11:2019 © IEC 2019
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 speci
...