1、 TSB-184 July 2009 Guidelines 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 i
2、mprovement 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 no
3、t 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 In
4、stitute (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 reg
5、ulatory 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. (From Project No. 3-0324-B-1, formulated under the cognizance of the TIA TR-42 Telecommunicati
6、ons Cabling Systems, TR-42.7 Subcommittee on Telecommunications CopperCabling Systems). Published by TELECOMMUNICATIONS INDUSTRY ASSOCIATION Standards and Technology Department 2500 Wilson Boulevard Arlington, VA 22201 U.S.A. PRICE: Please refer to current Catalog of TIA TELECOMMUNICATIONS INDUSTRY
7、ASSOCIATION STANDARDS AND ENGINEERING PUBLICATIONS or call IHS, USA and Canada (1-877-413-5187) International (303-397-2896) or search online at http:/www.tiaonline.org/standards/catalog/ All rights reserved Printed in U.S.A. NOTICE OF COPYRIGHT This document is copyrighted by the TIA. Reproduction
8、of these documents either in hard copy or soft copy (including posting on the web) is prohibited without copyright permission. For copyright permission to reproduce portions of this document, please contact TIA Standards Department or go to the TIA website (www.tiaonline.org) for details on how to r
9、equest permission. Details are located at: http:/www.tiaonline.org/standards/catalog/info.cfm#copyright OR Telecommunications Industry Association Standards (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) th
10、e Document may be amended, modified or changed in the standards development or any editing process. The use or practice 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 make
11、s no search or investigation for IPR. When IPR consisting of patents and published pending patent applications are claimed 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 obl
12、igation to investigate or inquire into, the scope or validity of any claims of IPR. TIA will neither be a party to discussions 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 reasonab
13、le or non-discriminatory. TIA does not warrant or represent that procedures or practices suggested or provided in the 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 (“o
14、ther SSO”) engaged in the formulation, development or publication of standards (whether designated as a standard, specification, recommendation or otherwise), whether such reference consists of mandatory, alternate or optional elements (as defined in the TIA Engineering Manual, 4thedition) then (i)
15、TIA disclaims any duty or obligation to search or investigate the records of any other SSO for IPR or letters of assurance relating to any such Normative Reference; (ii) TIAs policy of encouragement of voluntary disclosure (see Engineering Manual Section 6.5.1) of Essential Patent(s) and published p
16、ending patent applications shall apply; and (iii) Information as to claims of 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
17、 contents of the Document. TIA does not certify, inspect, test or otherwise investigate 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
18、 ACCURACY OF THE CONTENTS, ITS FITNESS OR APPROPRIATENESS FOR A PARTICULAR PURPOSE 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
19、OR WARRANTIES REGARDING THE CONTENTS COMPLIANCE WITH ANY APPLICABLE STATUTE, RULE 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,
20、 DIRECT OR INDIRECT, ARISING FROM OR RELATING TO ANY USE OF THE CONTENTS CONTAINED 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
21、CONTRACT, BREACH OF WARRANTY, TORT (INCLUDING NEGLIGENCE), PRODUCT LIABILITY OR 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 L
22、IMITATIONS. TIA TSB-184 iii Guidelines for Supporting Power Delivery Over Balanced Twisted-Pair Cabling TABLE OF CONTENTS Foreword . v 1 Scope . 1 2 Normative 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
23、3.4 Units of measure 2 4 Configuration, structure and topology 2 4.1 General. 2 4.1.1 End-point DCPS 2 4.1.2 Mid-span DCPS 2 4.2 Functional elements . 3 4.3 Cabling topology 3 5 Cabling selection and performance . 3 6 Installation guidelines 3 6.1 General. 3 6.2 Ambient temperature 3 7 Transmission
24、requirements . 4 7.1 dc loop resistance 4 7.2 dc resistance unbalance 4 8 Remote powering configurations and related transmission performance . 4 8.1 Recommendations for cabling system for use with end-point DCPS 5 8.2 Recommendations for cabling systems with mid-span DCPS . 6 8.2.1 Mid-span DCPS wi
25、th no continuity on power insertion pairs (case I) . 7 8.2.2 Mid-span DCPS with ac continuity on all pairs (case II) . 8 8.3 Additional field test considerations . 8 Annex A (informative) Additional installation guidelines . 9 A.1 General. 9 A.2 Minimum cabling category . 9 A.3 Temperature rise and
26、current capacity 9 A.4 Measurement results for current capacity 11 A.5 Considerations for current capacity of category types and installation conditions 11 Annex B (Informative) - Bibliography . 14 TIA TSB-184 iv LIST OF TABLES Table 1 - Maximum dc loop resistance of channels 4 Table 2 - dc resistan
27、ce unbalance of cables, connecting hardware and channels 4 Table A.1 - Current capacity per pair for a 100-cable bundle . 10 Table A.2 - factors for equation (A-1) 11 Table A.3 - Temperature rise for a category of cable v. cable bundle size (720mA per pair) 12 Table A.4 - Number of cables in a bundl
28、e per layer . 12 Table A.5 - Example of temperature rise for category of cable vs. number of energized pairs in 100-cable bundle (600 mA per pair) . 13 TIA TSB-184 v Foreword (This foreword is not a part of this document.) This Technical Systems Bulletin (TSB) was developed by TIA Subcommittee TR-42
29、.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 every 5 years. At that time, standards are reaffirmed, rescinded, or revised according to the submitted updates. Updates to be included in the
30、 next revision should be sent to the committee chair or to TIA. Contributing Organizations More than 30 organizations within the telecommunications industry contributed their expertise to the development of this Standard (including manufacturers, consultants, end users, and other organizations). The
31、 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 annex B. Annexes Annexes A and B are informative. Introduction A growing number of enterprises employ remotely powere
32、d 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 cabling, as specified in the ANSI/TIA-568-C series of Standards, for
33、supporting the delivery of SELV power to powered equipment in parallel with data transmission. It is intended to guide new installations and renovations. The customer premises may encompass one or more buildings or may be within a building that contains more than one enterprise. The cabling may be i
34、nstalled prior to the selection of powering or powered equipment. The ANSI/TIA-568-C series of Standards specify the structure and performance requirements for cabling systems that support a wide range of applications. The TSB was developed based on a number of contributions describing remote poweri
35、ng over generic telecommunications cabling under different installation conditions. Consult the appropriate safety standards, application standard, and with equipment manufacturers and cabling system suppliers for guidance on other factors that should be taken into account during the design of the r
36、emote power distribution system. TIA TSB-184 1 1 Scope The purpose of this document is to provide guidelines that will enable the support of a wide variety of safety extra low voltage (SELV) limited power source (LPS) applications using remote power supplied over balanced twisted-pair cabling. Examp
37、les of such applications include LAN devices supported by IEEE Std 802.3 DTE Power, wireless access points, TIA-862 building automation and security devices like remote cameras, IP telephone and multimedia devices supported by IEEE Std 1394-2008. The guidelines in this TSB are considered to be in ad
38、dition to, and not in place of, the infrastructure specified in the ANSI/TIA-568-C series of Standards. The TSB covers the transmission and electrical parameters needed to support power over category 5e or better balanced twisted-pair cabling. The guidelines address various environmental conditions
39、related to the installed cabling, bundled cabling, cabling in conduit, different cabling categories and cable types, and how these may impact the capability of balanced twisted-pair cabling to support remote powering. This TSB provides additional guidelines with respect to: a) parameters needed for
40、remote powering; b) references to safety standards; c) different installation conditions that require special considerations; d) application considerations; e) mitigation considerations; and f) cabling configurations and related field test considerations The cabling systems detailed in this TSB are
41、designed to be used to support SELV power, as defined in IEC 60950-1. Safety (electrical, fire, etc.) and electromagnetic compatibility (EMC) requirements are outside the scope of this TSB. 2 Normative references The following standards contain provisions that, through reference in this TSB, constit
42、ute provisions of this TSB. At the time of publication, the editions indicated were valid. All standards are subject to revision; parties to agreements based upon this TSB are encouraged to investigate the possibility of applying the most recent editions of the standards indicated. ANSI and TIA main
43、tain registers of currently valid national standards published by them. ANSI/TIA-568-C.0, Generic Telecommunications Cabling for Customer Premises, 2008 ANSI/TIA-568-C.1, Commercial Building Telecommunications Cabling Standard, 2008 ANSI/TIA-568-C.2, Balanced Twisted-Pair Telecommunication Cabling a
44、nd Components Standard, 2009 IEEE Std 802.3-2008, IEEE Standard for Information technologyTelecommunications and information exchange between systemsLocal and metropolitan area networksSpecific requirementsPart 3: Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Access Method and Phy
45、sical Layer Specifications- Section Two, Clause 33, December 2008 IEEE P802.3at, IEEE Standard for Information technologyTelecommunications and information exchange between systemsLocal and metropolitan area networksSpecific requirementsPart 3: Carrier Sense Multiple Access with Collision Detection
46、(CSMA/CD) Access Method and Physical Layer SpecificationsAmendment: Data Terminal Equipment (DTE) Power via Media Dependent Interface (MDI) Enhancements, 2009. IEC 60950-1, Information technology equipment Safety part 1: General requirements, 2005 IEC 61935-1, Testing of balanced communication cabli
47、ng in accordance with ISO/IEC 11801 Part 1: Installed cabling, 2009 TIA TSB-184 2 3 Definitions, acronyms and abbreviations, units of measure 3.1 General For the purpose of this TSB, the following definitions, acronyms, abbreviations and units of measure apply. 3.2 Definitions DCPS, end-point: A dc
48、power source providing power at one end of the cabling channel. DCPS, mid-span: A dc power source providing power at a point within the cabling channel. power source equipment: An active device that provides power. remote power: Low voltage power supplied over telecommunications cabling. 3.3 Acronym
49、s and abbreviations ACRF Attenuation to crosstalk ratio far-end. ANSI American National Standards Institute CP consolidation point dc direct current DCPL dc power load DCPS dc power source ELFEXT equal level far-end crosstalk HVAC heating, ventilation and air conditioning IEC International Electrotechnical Commission LAN local area network LPS limited power source NEXT near-end crosstalk PD powered device PSE power source equipment SELV safety extra-low voltage TIA Telecommunications Industry Association TO Telecommunications outlet 3.4 Units of measure
