ISO/IEC TR 11801-9911:2024

Information technology - Generic cabling for customer premises - Part 9911: Guidelines for the use of balanced single pair applications within a balanced 4-pair cabling system

ISO/IEC TR 11801-9911:2024, which is a Technical Report,
a) describes the rules of implementation of balanced single pair as described by ISO/IEC 11801-6:2017/AMD1:202x within a balanced 4- pair cabling system with a current carrying capacity of 0,75 A per conductor;
b) describes the use of components and cabling to implement and configure according to ISO/IEC 11801-6:2017/AMD1:202x
c) describes links and components for generic single pair channels according to ISO/IEC 11801-1:2017/AMD1:202x. Particular areas of interest are:
• remote powering according to IEEE Std 802.3, Clause 104
• loop resistance, max. current
• insertion loss
• return loss
• noise considerations
• frequency range requirements (low and high)
• length calculation of the SCP-Link-4-pair-cable
• number of channels
d) describes the use of application specific single pair channels in addition to ISO/IEC 11801:2017/AMD1:202x, 6.6.4
e) describes guidance on single pair remote powering applications when using 4-pair cabling with current carrying capacity specified
f) describes guidelines for planning, administration and installation

General Information

• Status: Published
• Publication Date: 04-Nov-2024
• ICS: 35.200 - Interface and interconnection equipment
• Technical Committee: ISO/IEC JTC 1/SC 25 - Interconnection of information technology equipment
• Drafting Committee: WG 3 - ISO/IEC JTC 1/SC 25/WG 3
• Current Stage: PPUB - Publication issued
• Start Date: 05-Nov-2024
• Completion Date: 04-Oct-2024

Overview

ISO/IEC TR 11801-9911:2024 (Edition 1.0, 2024-11) is a Technical Report from IEC/ISO that provides guidance for using balanced single pair applications within an engineered balanced 4‑pair cabling system. It explains implementation rules, component use, channel/link evaluation and planning when single‑pair links share or are deployed over 4‑pair cabling with a specified current carrying capacity of 0.75 A per conductor. The report supports integration of single pair technologies into existing generic cabling infrastructures for customer premises.

Key Topics and Requirements

The report focuses on practical technical parameters and installation guidance, including:

• Link and channel creation: rules for establishing single pair channels (SCP) within 4‑pair cabling infrastructure and definitions of extended generic channels.
• Powering and remote power: guidance for single pair remote powering consistent with IEEE Std 802.3dd and ISO/IEC cabling requirements.
• Electrical limits: loop resistance, DC loop resistance tables, maximum current and current carrying capacity (0.75 A per conductor).
• Signal integrity: insertion loss, return loss, propagation delay, and frequency‑range requirements (lower and upper bands).
• Noise and crosstalk: alien crosstalk (PS ANEXT, PS AACR‑F), coupling attenuation and unbalance attenuation (TCL/ELTCTL) considerations.
• Length and extension calculations: methods to compute SCP‑Link lengths when using 4‑pair cable and allowed extension lengths for various single‑pair classes.
• Components and cabling: guidance on compatible cables, connectors and component behavior when supporting multiple simultaneous single pair applications.
• Planning and administration: installation, bonding, segregation of lower‑power (≤0.75 A) cabling from higher‑power systems, and administration best practices.

Practical Applications & Users

ISO/IEC TR 11801-9911:2024 is aimed at stakeholders who design, specify, install or certify structured cabling and device networks at customer premises, including:

• Network architects and cabling system designers integrating single pair Ethernet or IoT links into existing 4‑pair infrastructures.
• Building automation and industrial network engineers deploying M2M, sensor networks, and low‑power devices.
• Cabling manufacturers, test equipment vendors and installers seeking compliance guidance for combined single‑pair/4‑pair systems.
• Facility managers and integrators planning remote powering and channel administration strategies.

Adopting these guidelines enables scalable deployment of balanced single pair applications while maintaining signal integrity, power safety and predictable channel performance.

Related Standards

• ISO/IEC 11801‑1 (Generic cabling - Part 1: General requirements)
• ISO/IEC 11801‑6 (Balanced single pair cabling)
• ISO/IEC 11801‑3, ‑4 (Component and configuration guidance)
• IEEE Std 802.3dd (Single‑pair Ethernet / remote powering)

Keywords: ISO/IEC TR 11801-9911:2024, balanced single pair, 4‑pair cabling system, single pair remote powering, insertion loss, return loss, alien crosstalk, SCP link.

Standards Content (Sample)

ISO/IEC TR 11801-9911
Edition 1.0 2024-11
TECHNICAL
REPORT
colour
inside
Information technology – Generic cabling for customer premises –
Part 9911: Guidelines for the use of balanced single pair applications within
a balanced 4-pair cabling system

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ISO/IEC TR 11801-9911
Edition 1.0 2024-11
TECHNICAL
REPORT
colour
inside
Information technology – Generic cabling for customer premises –

Part 9911: Guidelines for the use of balanced single pair applications within

a balanced 4-pair cabling system

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 35.200 ISBN 978-2-8322-9937-1

– 2 – ISO/IEC TR 11801-9911:2024 © IEC 2024
CONTENTS
FOREWORD .4
INTRODUCTION .6
1 Scope .7
2 Normative references .7
3 Terms and definitions .7
4 Simultaneous operation of multiple single pair applications within an engineered
system that includes 4-pair cabling components in accordance with ISO/IEC
11801-1:2017 [2] .8
4.1 General .8
4.2 Creation of single pair cabling channels .8
4.3 Evaluation of the parameters that must be fulfilled by the shared SCP 4-pair
link .9
4.3.1 General .9
4.3.2 T1-A-100 .9
4.3.3 T1-A-400 and T1-A-1000 . 10
4.3.4 T1-B. 11
4.3.5 T1-C . 12
5 Guidance . 13
5.1 General . 13
5.2 Frequency range . 14
5.2.1 Lower frequency . 14
5.2.2 Upper or higher frequency . 14
5.3 Return loss . 14
5.4 Insertion loss . 15
5.5 Direct current (DC) loop resistance . 15
5.6 Direct current (DC) resistance unbalance . 15
5.7 Current carrying capacity . 15
5.8 Dielectric withstand . 16
5.9 Propagation delay . 16
5.10 Unbalance attenuation (TCL and ELTCTL) . 16
5.11 Coupling attenuation . 16
5.12 Alien crosstalk (PS ANEXT and PS AACR-F) . 16
5.13 Different disturbers . 17
5.14 Cables . 17
5.15 Connectors . 18
5.16 Installation . 18
5.17 Bonding . 18
5.18 Administration . 18
5.19 Supported applications . 18
5.20 Segregation of maximum 0,75 A cabling components from higher power
applications . 19
Bibliography . 20

Figure 1 – Structure and definition of an extended type B generic channel .8
Figure 2 – Return loss (RL) comparison between single pair and 4-pair cabling classes . 14

Figure 3 – Insertion loss (IL) comparison between ISO/IEC/IEEE 8802-3:2021/Amd
5:2021 [7] and cabling classes . 15
Figure 4 – Comparison between 4-pair and single pair link requirements in linear and
logarithmic scale . 17

Table 1 – Evaluation of a 4-pair SCP link for T1-A-100 .9
Table 2 – Allowed extension lengths for T1-A-1000 extensions based on 4-pair SCP
classes . 10
Table 3 – Allowed extension lengths for T1-A-400 extension based on 4-pair SCP
classes . 10
Table 4 – Evaluation of an 4-pair SCP link for T1-A-400 and T1-A-1000 . 11
Table 5 – Evaluation of a 4-pair SCP link for T1-B . 11
Table 6 – Evaluation of a 4-pair SCP link for T1-C . 12
Table 7 – Nominal cable DC loop resistance . 15
Table 8 – Support of single pair cabling classes by 4-pair cabling classes based on
alien crosstalk . 17
Table 9 – Support of single pair cabling classes by 4-pair cabling classes based on
IEEE Std 802.3dd [6] powering classes . 18

– 4 – ISO/IEC TR 11801-9911:2024 © IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Information technology – Generic cabling for customer premises –
Part 9911: Guidelines for the use of balanced single pair applications
within a balanced 4-pair cabling system

FOREWORD
1) ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission)
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participate in the development of International Standards through technical committees established by the
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all such patent rights.
ISO/IEC TR 11801-9911 has been prepared by subcommittee 25: Interconnection of information
technology equipment, of ISO/IEC joint technical committee 1: Information technology. It is a
Technical Report.
The list of all currently available parts of the ISO/IEC 11801 series, under the general title
Information technology - Generic cabling for customer premises, can be found on the IEC and
ISO websites.
The text of this Technical Report is based on the following documents:
DTR Report on voting
JTC1-SC25/3253/DTR JTC1-SC25/3282/RVDTR
Full information on the voting for the approval of this Technical Report can be found in the
report on voting indicated in the above table.

The language used for the development of this Technical Report is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, JTC 1 Supplement,
available at http://www.iec.ch/members_experts/refdocs and http://www.iso.org/directives.
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– 6 – ISO/IEC TR 11801-9911:2024 © IEC 2024
INTRODUCTION
The ISO/IEC 11801 series is currently being revised to cover “balanced single pair cabling
systems”, which will expand the range of use for structured cabling systems. With the capability
of delivering data and power, these systems are ideally suited for incorporating Internet of
Things (IoT) devices into premises cabling systems. Single pair applications are increasingly
important for all operators of automation networks in buildings and industrial areas.
Implementing these new single pair cabling structures provides for application of device-level
diagnostics and security and provides for improved system scalability. Single pair cabling is not
meant to replace traditional 4-pair cabling, but to support emerging applications, such as
interconnecting IoT and M2M (machine-to-machine) devices.
This document gives guidance and instructions for the use of balanced single pair cabling as
specified in ISO/IEC 11801-1:2017/AMD1:- [1] and 4-pair components specified in ISO/IEC
11801-1:2017 [2] together in the same balanced cabling system assuring application support in
accordance with ISO/IEC 11801-6 [3].

___________
Under preparation. Stage at the time of publication: ISO/IEC CD 11801-1:2017/AMD1:2023.

Information technology – Generic cabling for customer premises –
Part 9911: Guidelines for the use of balanced single pair applications
within a balanced 4-pair cabling system

1 Scope
This part of ISO/IEC 11801, which is a Technical Report,
a) describes the rules of implementation of balanced single pair cabling as specified by
ISO/IEC 11801-6 [3] within a balanced 4-pair cabling system with a current carrying capacity
of 0,75 A per conductor as specified in ISO/IEC 11801-1:2017 [2];
b) describes the use of ISO/IEC 11801-1:2017 [2] components and cabling to implement and
configure in accordance with ISO/IEC 11801-3:2017/AMD1:2021 [4], ISO/IEC 11801-4 [5]
and ISO/IEC 11801-6 [3];
c) describes links and components for generic single pair channels in accordance with ISO/IEC
11801-1:2017/AMD1:- [1]. Particular areas of interest are
1) remote powering in accordance with IEEE Std 802.3dd [6],
2) loop resistance and maximum current,
3) insertion loss,
4) return loss,
5) noise considerations,
6) frequency range requirements (low and high),
7) length calculation of the SCP link 4-pair-cable, and
8) number of channels;
d) describes the use of application-specific single pair channels in addition to ISO/IEC 11801-
1:2017/AMD1:- [1], 6.6.4;
e) describes guidance on single pair remote powering applications when using 4-pair cabling
with current carrying capacity specified by ISO/IEC 11801-1:2017 [2];
f) describes guidelines for planning, administration and installation.
NOTE This document compares requirements of existing 4-pair cabling classes and single-pair classes. The
described approach can be adjusted to any number of pairs.
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.
ISO/IEC 11801-1, Information technology - Generic cabling for customer premises - Part 1:
General requiements
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO/IEC 11801-1 apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/

– 8 – ISO/IEC TR 11801-9911:2024 © IEC 2024
• ISO Online browsing platform: available at https://www.iso.org/obp
4 Simultaneous operation of multiple single pair applications within an
engineered system that includes 4-pair cabling components in accordance
with ISO/IEC 11801-1:2017 [2]
4.1 General
This document assumes an extension of a 2-connector SCP link 4-pair type B cabling as
specified in ISO/IEC 11801-6 [3] with single pair components to create up to four channels that
conform to single pair generic channels (see Figure 1).

SD service distributor
SCP service concentration point
1P single pair
4P 4-pair
SO 1P service outlet, see ISO/IEC 11801-1:2017/AMD1:- [1], 10.14 and 10.15, TE outlet
TE 1P terminal equipment single pair
Cord 1P (SD + SO) single pair patchcord at both ends
Cord 4P (SD) 4-pair patchcord at SD end
SCP link 4P 4-pair service concentration point link
CP cable 1P concentration point cable single pair
Figure 1 – Structure and definition of an extended type B generic channel
4.2 Creation of single pair cabling channels
Based on 4.1 cabling channels can be achieved by:
a) creating up to four single pair channels based on 4-pair cabling that conforms to T1-A, T1-
B or T1-C;
b) creating up to four single pair links based on SCP link 4-pair cabling that conforms to T1-A,
T1-B or T1-C and adding single pair conformant cords;
c) reference implementation using single pair conformant single pair and 4-pair components
(see Clauses 9 and 10 of ISO/IEC 11801-1:2017/AMD1:- [1]).

4.3 Evaluation of the parameters that must be fulfilled by the shared SCP 4-pair link
4.3.1 General
Parameters that must be fulfilled by the shared cabling portion (SCP link 4-pair) to create a
single pair channel are specified by a single pair 2-connector link in ISO/IEC 11801-
1:2017/AMD1:- [1]. The result of the evaluation for M I C E is given in the respective tables.
1 1 1 1
For other environments the result is re-evaluated with the requirements given in ISO/IEC 11801-
1:2017/AMD1:- [1] .
In Table 1, Table 3, Table 4, Table 5, Table 6, Table 8 and Table 9, “D”, “Q”, “M”, “NA” and “N”
are used with the following meaning:
a) D: met by design
b) Q: met when passing a qualification test
c) M: met when mitigation action is taken
d) NA: not applicable
e) N: not possible
Guidance is given in Clause 5.
4.3.2 T1-A-100
The evaluation of the 4-pair SCP link to create a T1-A-100 link is shown in Table 1.
Table 1 – Evaluation of a 4-pair SCP link for T1-A-100
4-pair SCP link parameter Fulfilled by Class Guidance
D E E F F subclause
A A
Frequency range:   5.2
low Q Q Q Q Q 5.2.1
high D D D D D 5.2.2
Return loss Q Q Q Q Q 5.3
Insertion loss M D D D D 5.4
Direct current (DC) loop resistance M M D D D 5.5
Direct current (DC) resistance unbalance Q Q D D D 5.6
Current carrying capacity D D D D D 5.7
Dielectric withstand D D D D D 5.8
Propagation delay D D D D D 5.9
TCL (unscreened only) Q Q Q NA NA 5.10
ELTCTL (unscreened only) Q Q Q NA NA 5.10
Coupling attenuation (screened only) D D D D D 5.11
PS ANEXT Q Q D D D 5.12
PS AACR-F Q Q D D D 5.12
Additional criteria to be considered
Different disturbers 5.13
Cables 5.14
Connectors 5.15
Installation 5.16
Bonding 5.17
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