ISO/IEC TR 29125:2010

Information technology — Telecommunications cabling requirements for remote powering of terminal equipment

ISO/IEC TR 29125:2010 targets the support of applications that provide remote power over balanced cabling to terminal equipment; covers the transmission and electrical parameters needed to support remote power over balanced cabling; covers various installation scenarios and how these may impact the capability of balanced cabling to support remote powering; specifies design and configuration of cabling as specified in International Standards ISO/IEC 11801, ISO/IEC 15018, ISO/IEC 24702 and ISO/IEC 24764; provides requirements and guidelines that will enable the support of a wide variety of extra low voltage (ELV) limited power source (LPS) applications using remote power supplied over balanced cabling.

Technologies de l'information — Exigences de câblage des télécommunications pour téléalimentation d'équipement terminal

General Information

• Status: Withdrawn
• Publication Date: 05-Oct-2010
• Withdrawal Date: 05-Oct-2010
• ICS: 35.200 - Interface and interconnection equipment
• Technical Committee: ISO/IEC JTC 1/SC 25 - Interconnection of information technology equipment
• Drafting Committee: ISO/IEC JTC 1/SC 25 - Interconnection of information technology equipment
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 18-Apr-2017

Relations

• Revised: ISO/IEC TS 29125:2017 - Information technology — Telecommunications cabling requirements for remote powering of terminal equipment
• Effective Date: 28-Nov-2015

Standards Content (Sample)

ISO/IEC TR 29125
Edition 1.0 2010-09
TECHNICAL
REPORT

colour
inside

Information technology – Telecommunications cabling requirements for remote
powering of terminal equipment



ISO/IEC TR 29125:2010(E)

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ISO/IEC TR 29125
Edition 1.0 2010-09
TECHNICAL
REPORT

colour
inside

Information technology – Telecommunications cabling requirements for remote
powering of terminal equipment


INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
F
ICS 35.200 ISBN 978-2-88912-141-0

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– 2 – TR 29125 © ISO/IEC:2010(E)
CONTENTS
FOREWORD.3
INTRODUCTION.5
1 Scope.6
2 Normative references.6
3 Terms, definitions and abbreviations .7
3.1 Terms and definitions .7
3.2 Abbreviations.7
4 Conformance.7
5 Cabling selection and performance .8
6 Installation conditions .8
6.1 General .8
6.2 Ambient temperature .8
6.3 Temperature rise and current capacity .8
6.4 Factors affecting temperature increase .9
6.4.1 General .9
6.4.2 Cable count within a bundle .9
6.4.3 Reducing temperature increase.10
7 Transmission requirements.11
8 Remote power delivery over balanced cabling .11
9 Connecting hardware .14
Annex A (informative) Mitigation considerations for installed cabling .16
A.1 General .16
A.2 Minimum cabling class.16
A.3 Bundle size and location .16
A.4 Mitigation options.16
Bibliography .17

Figure 1 – Examples of end point powering systems using signal pairs (top) and spare
12
pairs (bottom) .
Figure 2 – Examples of midspan powering systems using signal pairs (top) and spare
pairs (bottom) .13
Figure 3 – Examples of endpoint powering systems with two power sources and sinks.14

Table 1 – Maximum current per pair versus temperature rise in a bundle of 100 4 pair
Category 5 cables (all pairs energized .9
Table 2 – Current per pair versus temperature rise in a bundle of 100 4 pair cables (all
pairs energized) .9
Table 3 – Temperature rise for a category of cable versus cable bundle size
(600 mA per pair) .10
Table 4 – Temperature rise for a category of cable versus the number of energized
pairs in a 100-cable bundle (600 mA per pair).11

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TR 29125 © ISO/IEC:2010(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

INFORMATION TECHNOLOGY –
TELECOMMUNICATIONS CABLING REQUIREMENTS
FOR REMOTE POWERING OF TERMINAL EQUIPMENT


FOREWORD
1) ISO (International Organization for Standardization) and IEC (International Electrotechnical Commission) form
the specialized system for worldwide standardization. National bodies that are members of ISO or IEC
participate in the development of International Standards. Their preparation is entrusted to technical
committees; any ISO and IEC member body interested in the subject dealt with may participate in this
preparatory work. International governmental and non-governmental organizations liaising with ISO and IEC
also participate in this preparation.
2) In the field of information technology, ISO and IEC have established a joint technical committee,
ISO/IEC JTC 1. Draft International Standards adopted by the joint technical committee are circulated to
national bodies for voting. Publication as an International Standard requires approval by at least 75 % of the
national bodies casting a vote.
3) The formal decisions or agreements of IEC and ISO 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 and ISO member bodies.
4) IEC, ISO and ISO/IEC publications have the form of recommendations for international use and are accepted
by IEC and ISO member bodies in that sense. While all reasonable efforts are made to ensure that the
technical content of IEC, ISO and ISO/IEC publications is accurate, IEC or ISO cannot be held responsible for
the way in which they are used or for any misinterpretation by any end user.
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Any divergence between any ISO/IEC publication and the corresponding national or regional publication should
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any equipment declared to be in conformity with an ISO/IEC publication.
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subject of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights.
The main task of IEC and ISO technical committees is to prepare International Standards. In
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technical report of one of the following types:
• type 1, when the required support cannot be obtained for the publication of an International
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Standard;
• type 3, when the technical committee has collected data of a different kind from that which
is normally published as an International Standard, for example ‘state of the art’.

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– 4 – TR 29125 © ISO/IEC:2010(E)
Technical reports of types 1 and 2 are subject to review within three years of publication to
decide whether they can be transformed into International Standards. Technical reports of
type 3 do not necessarily have to be reviewed until the data they provide are considered to be
no longer valid or useful.
ISO/IEC TR 29125, which is a technical report of type 2, was prepared by subcommittee 25:
Interconnection of information technology equipment, of ISO/IEC joint technical committee 1:
Information technology.
This document is issued in the type 2 technical report series of publications (according to
th
16.2.2 of the Procedures for the technical work of ISO/IEC JTC 1 (5 edition, 2004)) as a
prospective standard for provisional application in the field of remote powering of terminal
equipment, because there is an urgent requirement for guidance on how standards in this field
should be used.
This document is not to be regarded as an International Standard. It is proposed for provisional
application so that information and experience of its use in practice may be gathered.
Comments on the content of this document should be sent to IEC Central Office.
A review of this type 2 technical report will be carried out not later than three years after its
publication with the option of extension for a further three years, conversion into an
International Standard or withdrawal.
This Technical Report has been approved by vote of the member bodies, and the voting results
may be obtained from the address given on the second title page.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
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of its contents. Users should therefore print this document using a colour printer.

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TR 29125 © ISO/IEC:2010(E) – 5 –
INTRODUCTION
This Technical Report specifies the use of generic balanced cabling for customer premises, as
specified in international standards ISO/IEC 11801, ISO/IEC 15018, ISO/IEC 24702 and
ISO/IEC 24764, for remote powering of terminal equipment. It provides guidance on new
cabling installations and renovations. The customer premises may encompass one or more
buildings or may be within a building that contains more than one organisation. The cabling
may be installed prior to the selection of remote powering equipment or powered terminal
equipment.
International standards ISO/IEC 11801, ISO/IEC 15018, ISO/IEC 24702 and ISO/IEC 24764
specify a structure and performance requirements for cabling subsystems that support a wide
range of applications. They provide appropriate equipment interfaces to the cabling
infrastructure in equipment rooms, telecommunications rooms and work areas.
A growing number of organisations employ equipment at locations that require the provision of
remote powering. This Technical Report was created to provide supplementary information to
ISO/IEC 11801 to implement remote powering over generic balanced cabling as specified in
ISO/IEC 11801, ISO/IEC 15018, ISO/IEC 24702 and ISO/IEC 24764.
This Technical Report provides additional guidance for remote powering on the use of
balanced cabling systems as specified in ISO/IEC 11801, ISO/IEC 15018, ISO/IEC 24702 and
ISO/IEC 24764 guidance on different installation conditions that require special considerations;
• information to bring together all the considerations about remote powering in a single
document,
• guidance on mating and unmating of connectors that convey remote power.
This Technical Report does not include requirements from national or local safety standards
and regulations.
The Technical Report was developed based on a number of contributions describing remote
powering over telecommunications cabling under different installation conditions. Consult with
the relevant safety standards and regulations, application standard, and with equipment
manufacturers for guidance on factors that should be taken into account during design of the
generic balanced cabling that supports the distribution of remote powering.

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– 6 – TR 29125 © ISO/IEC:2010(E)
INFORMATION TECHNOLOGY –
TELECOMMUNICATIONS CABLING REQUIREMENTS
FOR REMOTE POWERING OF TERMINAL EQUIPMENT



1 Scope
This Technical Report:
• targets the support of applications that provide remote power over balanced cabling to
terminal equipment;
• covers the transmission and electrical parameters needed to support remote power over
balanced cabling;
• covers various installation scenarios and how these may impact the capability of balanced
cabling to support remote powering;
• specifies design and configuration of cabling as specified in International Standards
ISO/IEC 11801, ISO/IEC 15018, ISO/IEC 24702 and ISO/IEC 24764;
• provides requirements and guidelines that will enable the support of a wide variety of extra
low voltage (ELV) limited power source (LPS) applications using remote power supplied
over balanced cabling.
Requirements and guidelines are provided with respect to
• cabling selection and performance (Clause 5),
• installation conditions (Clause 6),
• transmission requirements (Clause 7),
• power delivery (Clause 8),
• connecting hardware (Clause 9),
• mitigation considerations (Annex A).
Safety (electrical, fire, etc.) and electromagnetic compatibility (EMC) requirements are outside
the scope of this Technical Report.
2 Normative references
The following referenced documents are indispensable for the application 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, Information technology – Generic cabling for customer premises
ISO/IEC 14763-2,– Information technology – Implementation and operation of customer
1
premises cabling – Part 2: Planning and installation
ISO/IEC 15018, Information technology – Generic cabling for homes
ISO/IEC 18010, Information technology – Pathways and spaces for customer premises
cabling
___________
1
 To be published.

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TR 29125 © ISO/IEC:2010(E) – 7 –
ISO/IEC 24702, Information technology – Generic cabling – Industrial premises
ISO/IEC TR 24746, Information technology – Generic cabling for customer premises – Mid-
span DTE power insertion
ISO/IEC 24764, Information technology – Generic cabling systems for data centres
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO/IEC 11801,
ISO/IEC 18010, ISO/IEC 14763-2, and the following apply.
3.1.1
power source equipment
equipment that provides power
3.1.2
remote powering
supply of power to application specific equipment via balanced cabling
3.1.3
terminal equipment
equipment that provides access to an application / service
3.1.4
current carrying capacity
maximum current a cable circuit (one or several conductors) can support resulting in a
specified increase of the surface temperature of the conductor beyond the ambient
temperature, not exceeding the maximum allowed operating temperature of the c
...