1、 TSB-184-A March 2017Guidelines for Supporting Power Delivery Over Balanced Twisted-Pair Cabling NOTICE TIA Engineering Standards and Publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability and
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20、nced Twisted-Pair Cabling TABLE OF CONTENTS Foreword . iv 1 Scope . 1 2 References 1 3 Definitions, acronyms and abbreviations, units of measure 2 3.1 General. 2 3.2 Definitions 2 3.3 Acronyms and abbreviations 2 3.4 Units of measure 2 4 Configuration, structure and topology 3 4.1 General. 3 4.1.1 E
21、nd-point DCPS 3 4.1.2 Mid-span DCPS 3 4.2 Functional elements . 3 4.3 Cabling topology 3 5 Cabling selection and performance . 3 5.1 Unmating under load 4 6 Installation guidelines 4 6.1 General. 4 6.2 Ambient temperature 4 6.3 Temperature rise 4 6.4 Non-bundled cables in pathways . 5 6.5 Bundled ca
22、bles . 5 7 DC resistance 5 7.1 DC loop resistance . 5 7.2 DC resistance unbalance (within pair) . 7 7.3 DC resistance unbalance (pair to pair) 7 8 Remote powering configurations and related transmission performance . 8 8.1 Recommendations for cabling system for use with end-point DCPS 9 8.2 Recommen
23、dations for cabling systems with mid-span DCPS . 10 8.2.1 Mid-span DCPS with no continuity on power insertion pairs (case I) . 11 8.2.2 Mid-span DCPS with ac continuity on all pairs (case II) . 12 8.3 Additional field test considerations . 13 Annex A Cabling types and installation guidelines for dc
24、powering. 14 A.1 General. 14 A.2 Minimum cabling category . 14 A.3 Temperature rise and current capacity 14 A.4 Considerations for current capacity of category types and installation conditions 14 A.5 Power Loss and Efficiency . 23 Annex B Modeling 25 B.1 Temperature rise vs. cables in bundle . 25 B
25、.2 Calculations 25 TIA TSB-184-A ii B.3 Example . 26 Annex C Measurement Method . 27 C.1 Introduction 27 C.2 Test Setup 27 C.2.1 Thermocouple placement . 27 C.2.2 Measurement of cable bundle in air 28 C.2.3 Measurement of cable bundle in conduit 29 Annex D Bibliography . 30 TIA TSB-184-A iii LIST OF
26、 FIGURES Figure 1 - Temperature gradient in typical cable bundle. . 4 Figure 2 - Examples of dc power being applied over balanced twisted-pair cabling. . 9 Figure 3- Example of end-point DCPS providing power on all four pairs of a channel. . 10 Figure 4 - Example of Case I mid-span power insertion w
27、ith no continuity on pairs 4,5 and 7,8. 11 Figure 5 - Example of Case II mid-span power insertion with ac continuity on all pairs. 12 Figure A.1 - Temperature rise v. number of cables in bundle in air (1000 mA per pair). . 19 Figure A.2 - Temperature rise v. number of cables in bundle in conduit (10
28、00 mA per pair). 20 Figure A.3 - 91 Cable Bundle. . 21 Figure A.4 - Three bundles of 37 cables. 21 Figure A.5 - 3 bundles of 37 cables with separation. 22 Figure C.1 - Placement of thermocouple. . 27 Figure C.2 - Securing of the thermocouple. 28 Figure C.3 - Test set-up for cable bundles in air. 28
29、Figure C.4 - Test set-up for cable bundles in conduit. 29 LIST OF TABLES Table 1 - Maximum dc loop resistance of channels. . 5 Table 2 - Nominal dc loop resistance of channels at 60C. 6 Table 3 - AWG dc resistance at 20C. 6 Table 4 - DC resistance unbalance (within pair) of cables, connecting hardwa
30、re and channels. 7 Table 5 - DC resistance unbalance (pair to pair). . 8 Table A.1 - Coefficients for use in Equation (A-1) at 20 C. . 15 Table A.2 - Temperature rise for a category of cable v. number of cables in bundle (600mA per pair). 16 Table A.3 - Temperature rise for a category of cable v. nu
31、mber of cables in bundle (720mA per pair). 17 Table A.4 - Temperature rise for a category of cable v. number of cables in bundle (1000 mA per pair). . 18 Table A.5 - Maximum bundle size for 15 C temperature rise at 20 C ambient. . 18 Table A.6 - Maximum bundle size for 15 C temperature rise at 45 C
32、ambient. . 19 Table A.7 - Number of cables in a bundle per layer. 20 Table A.8 - Ampacity per pair at 45 C ambient temperature for a category of cable v. number of cables in bundle for standard 60 C rated cables. 23 Table A.9 - Nominal power loss per meter of different cable types. . 24 TIA TSB-184-
33、A iv Foreword (This foreword is not a part of this document.) This Technical Systems Bulletin (TSB) was developed by TIA Subcommittee TR-42.7. Approval of this Technical Systems Bulletin This TSB was approved by TIA Subcommittee TR-42.7, and TIA Engineering Committee TR-42. TIA reviews standards eve
34、ry 5 years. At that time, standards are reaffirmed, rescinded, or revised according to the submitted updates. Updates to be included in the next revision should be sent to the committee chair or to TIA. Significant Changes 1. Current has been increased to up to 1000 mA/pair. 2. Models have been refi
35、ned to include additional cable properties and installation conditions. 3. Temperature rise tables include temperature rise in open air and sealed conduit. 4. Bundling recommendations and installation recommendations have been added. 5. Measurement procedures to develop models have been refined and
36、included in the document. 6. Includes additional specifications for pair-to-pair dc resistance unbalance. Contributing Organizations More than 30 organizations within the telecommunications industry contributed their expertise to the development of this Bulletin (including manufacturers, consultants
37、, end users, and other organizations). The following documents may be useful to the reader: National Electrical Safety Code (NESC) (ANSI/IEEE C2-2007) National Electrical Code (NEC) (NFPA 70) Other references are provided in section 2 and annex D. This document and all of its annexes are informative
38、. Introduction A growing number of enterprises employ remotely powered equipment where centralized powering, power management and backup are needed, and in locations where local power is not easily provided. This Technical Systems Bulletin (TSB) provides guidelines for generic balanced twisted-pair
39、cabling, as specified in the ANSI/TIA-568 series of Standards, for supporting the delivery of safety extra low voltage (SELV) limited power source (LPS) power to equipment simultaneously with data transmission. It is intended to guide new installations and renovations. The customer premises may enco
40、mpass one or more buildings or may be within a building that contains more than one enterprise. The cabling may be installed prior to the selection of powering or powered equipment. The ANSI/TIA-568 series of Standards specify the structure and performance requirements for cabling systems that suppo
41、rt a wide range of applications. The TSB was developed based on a number of contributions describing remote powering over generic telecommunications cabling under different installation conditions. Consult the appropriate safety standards, application standard, and with equipment manufacturers and c
42、abling system suppliers for guidance on all factors that should be taken into account during the design of the remote power distribution system. TIA TSB-184-A v When twisted pair cabling is used to remotely power a device, the majority of the power entering the cable is successfully delivered to the
43、 device being powered; only a small percentage dissipated as heat in the cabling. This dissipation of power can cause the cabling to increase in temperature above the ambient temperature of the environment in which the cabling is installed. It is recommended to minimize cable temperature rise to red
44、uce long term cable degradation, to minimize negative effect on transmission performance and reduce the amount of heat added to the surrounding environment. This TSB describes methods to help manage temperature rise and keep cables below their maximum temperature ratings. TIA TSB-184-A 1 1 Scope The
45、 purpose of this document is to provide guidelines that support a wide variety of safety extra low voltage (SELV) limited power source (LPS) applications using remote power supplied over balanced twisted-pair cabling. Examples of such applications include LAN devices, wireless access points, ANSI/TI
46、A-862-B intelligent building systems devices like remote cameras, IP telephone and multimedia devices, all of which may be supported by standards such as IEEE Std 802.3 Clause 33 DTE Power via MDI or IEEE Std. 1394-2008. The guidelines in this TSB are in addition to, and not in place of, the infrast
47、ructure specified in the ANSI/TIA-568 series of standards. The TSB covers the transmission and electrical parameters needed to support power over category 5e or higher performance twisted-pair cabling. This guideline covers different cable categories, cable types, installation and operating conditio
48、ns including pathways and bundling. The TSB provides design, installation, and administration guidelines for effective deployment of remote powering over balanced twisted pair cabling. This TSB provides additional guidelines with respect to: a) parameters needed for remote powering; b) different ins
49、tallation conditions that require special considerations; c) application considerations; d) mitigation considerations; and e) cabling configurations and related field test considerations The cabling systems detailed in this TSB are designed to support SELV LPS power, as defined in IEC 60950-1. Safety and electromagnetic compatibility (EMC) requirements are outside the scope of this TSB. NOTE: SELV requirements specify a maximum voltage of 60 V dc and LPS is understood in the applications referenced to be up to 100 VA supplied within 4-pair cabling. 2 References The follow
