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11、or remote powering of terminal equipment INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 35.200 ISBN 978-2-8322-4223-0 Warning! Make sure that you obtained this publication from an authorized distributor. colour inside 2 ISO/IEC TS 29125:2017 ISO/IEC 2017 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope
12、 7 2 Normative references 7 3 Terms, definitions and abbreviated terms 7 3.1 Terms and definitions 7 3.2 Abbreviated terms . 8 4 Conformance . 8 5 Cabling selection and performance 9 6 Installation conditions 9 6.1 General . 9 6.2 Ambient temperature. 9 6.3 Temperature rise and current capacity 9 6.
13、4 Factors affecting temperature increase . 11 6.4.1 General . 11 6.4.2 Installation near equipment 11 6.4.3 Cable count within a bundle . 11 6.4.4 Reducing temperature increase . 12 6.4.5 Cable bundle suspended in air . 13 6.4.6 Administration 14 7 Remote power delivery over balanced cabling . 14 8
14、Connecting hardware . 15 (informative) Mitigation considerations for installed cabling 17 Annex A A.1 General . 17 A.2 Minimum cabling class 17 A.3 Bundle size and location . 17 A.4 Mitigation options 17 Annex B (informative) Modelling temperature rise for cable types, bundle sizes and installation
15、conditions 18 B.1 Model basics . 18 B.2 Power dissipated (P) . 18 B.3 Temperature difference from ambient temperature to bundle surface ( T u ) . 19 B.3.1 Model equations 19 B.3.2 Typical values for constant u. 19 B.4 Temperature difference from bundle surface to bundle centre ( T th ) . 19 B.4.1 Mo
16、del equations 19 B.4.2 Typical values for constant th19 B.5 Temperature variation within the bundle ( T(x) 20 B.6 Alternative presentation of the model 20 B.7 Adaptation model used to derive temperature rise vs. cables in a bundle 20 B.8 Calculations 21 B.9 Example 21 B.10 Coefficients for air and c
17、onduit 22 (informative) Transmission parameters related to remote powering 23 Annex C C.1 DC loop resistance 23 ISO/IEC TS 29125:2017 ISO/IEC 2017 3 C.2 DC resistance unbalance (within pair) . 23 C.3 DC resistance unbalance (pair to pair) 24 (informative) Illustrations of heating of various bundle s
18、izes and Annex D configurations 26 D.1 Limiting cable bundle size . 26 D.2 Separating into smaller bundles 27 (informative) Test protocol . 28 Annex E E.1 Background. 28 E.2 Test set-up . 28 Annex F (informative) Detailed test procedure . 30 F.1 General . 30 F.2 Test set-up . 30 F.2.1 Thermocouple p
19、lacement . 30 F.2.2 Measurement of cable bundle in air . 31 F.2.3 Measurement of cable bundle in conduit 32 Bibliography 34 Figure 1 Examples of end point powering systems using signal pairs (top) and spare pairs (bottom) . 14 Figure 2 Examples of mid-span powering systems . 15 Figure B.1 Temperatur
20、e rise profile 18 Figure D.1 91-cable bundle 26 Figure D.2 Three bundles of 37 cables . 26 Figure D.3 Three bundles of 37 cables with separation 27 Figure E.1 37-cable bundle and temperature location. 28 Figure E.2 “Perfect bundle“ and thermocouple configuration 29 Figure E.3 Conductor configuration
21、 29 Figure F.1 Placement of thermocouple . 30 Figure F.2 Securing of the thermocouple 31 Figure F.3 Test set-up for cable bundles in air . 32 Figure F.4 Test set-up for cable bundles in conduit 33 Table 1 Maximum current per conductor versus temperature rise in a 37-cable bundle in air and conduit (
22、all 4 pairs energized) 10 Table 2 Calculated worst case current per conductor versus temperature rise in a bundle of 37 4-pair cables (all pairs energized) . 11 Table 3 Temperature rise versus cable bundle size (500 mA per conductor) 12 Table 4 Temperature rise for a type of cable versus the number
23、of energized pairs in a 37-cable bundle (500 mA per conductor) 13 Table B.1 Bundling coefficients for different types of cables and cords (all 4 pairs energized) 22 Table C.1 Maximum DC loop resistance of channels 23 Table C.2 DC resistance unbalance of cables, connecting hardware and channels 24 Ta
24、ble C.3 DC resistance unbalance (pair to pair) . 25 4 ISO/IEC TS 29125:2017 ISO/IEC 2017 INFORMATION TECHNOLOGY TELECOMMUNICATIONS CABLING REQUIREMENTS FOR REMOTE POWERING OF TERMINAL EQUIPMENT FOREWORD 1) ISO (the International Organization for Standardization) and IEC (the International Electrotec
25、hnical Commission) form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC participate in the development of International Standards through technical committees established by the respective organization to deal with particular fields of technical a
26、ctivity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international organizations, governmental and non- governmental, in liaison with ISO and IEC, also take part in the work. In the field of information technology, ISO and IEC have established a joint technical c
27、ommittee, ISO/IEC JTC 1. 2) 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 National Committees and ISO memb
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35、n task of the joint technical committee is to prepare International Standards. In exceptional circumstances, the joint technical committee may propose the publication of a Technical Specification when the required support cannot be obtained for the publication of an International Standard, despite r
36、epeated efforts, or when the subject is still under technical development or where, for any other reason, there is the future but not immediate possibility of an agreement on an International Standard. Technical Specifications are subject to review within three years of publication to decide whether
37、 they can be transformed into International Standards. ISO/IEC TS 29125, which is a Technical Specification, has been prepared by subcommittee 25: Interconnection of information technology equipment, of ISO/IEC joint technical committee 1: Information technology. This first edition cancels and repla
38、ces ISO/IEC TR 29125:2010. This edition constitutes a technical revision. ISO/IEC TS 29125:2017 ISO/IEC 2017 5 This edition includes the following significant technical changes with respect to the previous edition: a) extension of the current per conductor from 300 mA to 500 mA; b) provision of addi
39、tional details of installation conditions that were not described in ISO/IEC TR 29125:2010; c) inclusion of guidelines for cords; d) inclusion of a model to calculate temperature rise in different bundle sizes. This Technical Specification has been approved by vote of the member bodies, and the voti
40、ng 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 that it contains colours which are considered to be useful
41、 for the correct understanding of its contents. Users should therefore print this document using a colour printer. 6 ISO/IEC TS 29125:2017 ISO/IEC 2017 INTRODUCTION This document specifies the use of generic balanced cabling for customer premises, as specified in the ISO/IEC 11801 series, for remote
42、 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 organization. The cabling may be installed prior to the selection of remote powering e
43、quipment or powered terminal equipment. ISO/IEC 11801-1 specifies 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 wo
44、rk areas. A growing number of organizations employ equipment at locations that require the provision of remote powering. This document was created to provide supplementary information to ISO/IEC 11801-1 to implement remote powering over generic balanced cabling as specified in ISO/IEC 11801-1. This
45、document provides additional guidance for remote powering on the use of balanced cabling systems as specified in ISO/IEC 11801-1 and guidance on different installation conditions that require special considerations: information to bring together all the considerations about remote powering in a sing
46、le document; guidance on mating and un-mating of connectors that convey remote power. This document does not include requirements from national or local safety standards and regulations. This document was developed based on a number of contributions describing remote powering over telecommunications
47、 cabling under different installation conditions. The relevant safety standards and regulations, application standard, and equipment manufacturers give guidance on factors that should be taken into account during design of the generic balanced cabling that supports the distribution of remote powerin
48、g. This document extends the current per conductor specified in ISO/IEC TR 29125:2010 from 300 mA to 500 mA. This document covers additional details of installation conditions that are not described in ISO/IEC TR 29125:2010. This document includes guidelines for cords. ISO/IEC TS 29125:2017 ISO/IEC
49、2017 7 INFORMATION TECHNOLOGY TELECOMMUNICATIONS CABLING REQUIREMENTS FOR REMOTE POWERING OF TERMINAL EQUIPMENT 1 Scope This document a) addresses the support of safety extra low voltage (SELV) and limited power source (LPS) applications that provide remote power over balanced cabling in accordance with the reference implementations of ISO/IEC 11801 series standards using currents per conductor of up to 500 mA and targets the support of applications that provide remote power over b
