TIA TSB-184-A-2017 Guidelines for Supporting Power Delivery Over Balanced Twisted-Pair Cabling.pdf

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

2、 improvement of products, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for their particular need. The existence of such Standards and Publications shall not in any respect preclude any member or non-member of TIA from manufacturing or selling products

3、not conforming to such Standards and Publications. Neither shall the existence of such Standards and Publications preclude their voluntary use by Non-TIA members, either domestically or internationally. Standards and Publications are adopted by TIA in accordance with the American National Standards

4、Institute (ANSI) patent policy. By such action, TIA does not assume any liability to any patent owner, nor does it assume any obligation whatever to parties adopting the Standard or Publication. This Standard does not purport to address all safety problems associated with its use or all applicable r

5、egulatory requirements. It is the responsibility of the user of this Standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations before its use. Any use of trademarks in this document are for information purposes and do not constitute an

6、 endorsement by TIA or this committee of the products or services of the company. (From Project No. TIA-PN-184-A-D1, formulated under the cognizance of the TIA TR-42 Telecommunications Cabling Systems, TR-42.7 Subcommittee on Telecommunications Copper Cabling Systems (568). Published by TELECOMMUNIC

7、ATIONS INDUSTRY ASSOCIATION Technology (b) there is no assurance that the Document will be approved by any Committee of TIA or any other body in its present or any other form; (c) the Document may be amended, modified or changed in the standards development or any editing process. The use or practic

8、e of contents of this Document may involve the use of intellectual property rights (“IPR”), including pending or issued patents, or copyrights, owned by one or more parties. TIA makes no search or investigation for IPR. When IPR consisting of patents and published pending patent applications are cla

9、imed and called to TIAs attention, a statement from the holder thereof is requested, all in accordance with the Manual. TIA takes no position with reference to, and disclaims any obligation to investigate or inquire into, the scope or validity of any claims of IPR. TIA will neither be a party to dis

10、cussions of any licensing terms or conditions, which are instead left to the parties involved, nor will TIA opine or judge whether proposed licensing terms or conditions are reasonable or non-discriminatory. TIA does not warrant or represent that procedures or practices suggested or provided in the

11、Manual have been complied with as respects the Document or its contents. If the Document contains one or more Normative References to a document published by another organization (“other SSO”) engaged in the formulation, development or publication of standards (whether designated as a standard, spec

12、ification, recommendation or otherwise), whether such reference consists of mandatory, alternate or optional elements (as defined in the TIA Procedures for American National Standards) then (i) TIA disclaims any duty or obligation to search or investigate the records of any other SSO for IPR or lett

13、ers of assurance relating to any such Normative Reference; (ii) TIAs policy of encouragement of voluntary disclosure (see TIA Procedures for American National Standards Annex C.1.2.3) of Essential Patent(s) and published pending patent applications shall apply; and (iii) Information as to claims of

14、IPR in the records or publications of the other SSO shall not constitute identification to TIA of a claim of Essential Patent(s) or published pending patent applications. TIA does not enforce or monitor compliance with the contents of the Document. TIA does not certify, inspect, test or otherwise in

15、vestigate products, designs or services or any claims of compliance with the contents of the Document. ALL WARRANTIES, EXPRESS OR IMPLIED, ARE DISCLAIMED, INCLUDING WITHOUT LIMITATION, ANY AND ALL WARRANTIES CONCERNING THE ACCURACY OF THE CONTENTS, ITS FITNESS OR APPROPRIATENESS FOR A PARTICULAR PUR

16、POSE OR USE, ITS MERCHANTABILITY AND ITS NONINFRINGEMENT OF ANY THIRD PARTYS INTELLECTUAL PROPERTY RIGHTS. TIA EXPRESSLY DISCLAIMS ANY AND ALL RESPONSIBILITIES FOR THE ACCURACY OF THE CONTENTS AND MAKES NO REPRESENTATIONS OR WARRANTIES REGARDING THE CONTENTS COMPLIANCE WITH ANY APPLICABLE STATUTE, R

17、ULE OR REGULATION, OR THE SAFETY OR HEALTH EFFECTS OF THE CONTENTS OR ANY PRODUCT OR SERVICE REFERRED TO IN THE DOCUMENT OR PRODUCED OR RENDERED TO COMPLY WITH THE CONTENTS. TIA SHALL NOT BE LIABLE FOR ANY AND ALL DAMAGES, DIRECT OR INDIRECT, ARISING FROM OR RELATING TO ANY USE OF THE CONTENTS CONTA

18、INED HEREIN, INCLUDING WITHOUT LIMITATION ANY AND ALL INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES (INCLUDING DAMAGES FOR LOSS OF BUSINESS, LOSS OF PROFITS, LITIGATION, OR THE LIKE), WHETHER BASED UPON BREACH OF CONTRACT, BREACH OF WARRANTY, TORT (INCLUDING NEGLIGENCE), PRODUCT LIABILITY O

19、R OTHERWISE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. THE FOREGOING NEGATION OF DAMAGES IS A FUNDAMENTAL ELEMENT OF THE USE OF THE CONTENTS HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. TIA TSB-184-A i Guidelines for Supporting Power Delivery Over Bala

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