1、 TIA-569-D-2 (Addendum to TIA-569-D) July 2018Telecommunications Pathways and Spaces: Addendum 2- Additional Pathway and Space Considerations for Supporting Remote Powering Over Balanced Twisted-Pair Cabling ANSI/TIA-569-D-2-2018 APPROVED: JULY 20, 2018 NOTICE TIA Engineering Standards and Publicati
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23、S A FUNDAMENTAL ELEMENT OF THE USE OF THE CONTENTS HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. ANSI/TIA-569-D-2 i TELECOMMUNICATIONS PATHWAYS AND SPACES ADDENDUM 2 ADDITIONAL PATHWAY AND SPACE CONSIDERATIONS FOR SUPPORTING REMOTE POWERING OVER BALANCED TWISTED-
24、PAIR CABLING Table of Contents 1 SCOPE 1 2 NORMATIVE REFERENCES . 1 3 DEFINITIONS, ACRONYMS AND ABBREVIATIONS, UNITS OF MEASURE 1 3.1 General . 1 3.2 Definitions . 1 3.3 Acronyms and abbreviations 1 3.4 Units of measure 1 4 THERMAL CHARACTERISTICS OF PATHWAYS . 2 4.1 Non-continuous supports 3 4.2 Ca
25、ble tray . 3 4.2.1 Wire mesh tray 3 4.2.2 Solid tray . 3 4.2.3 Perforated (ventilated) tray 4 4.2.4 Cable ladder system 4 4.3 Duct 4 4.4 Conduit . 4 4.4.1 Surface raceway 4 4.5 Catenary wire . 4 5 PATHWAY SYSTEM DESIGN AND INSTALLATION FACTORS 4 6 SEPARATION OF CABLES WITHIN PATHWAY TO IMPROVE HEAT
26、DISSIPATION . 5 Annex A (informative) BIBLIOGRAPHY 6 List of Tables Table 1 - Heat dissipation effectiveness of pathways (excluding cable trays) .2 Table 2 - Heat dissipation effectiveness of cable trays .3 ANSI/TIA-569-D-2 ii FOREWORD (This foreword is not part of the Addendum) This Addendum was de
27、veloped by TIA Subcommittee TR-42.3. Approval of this Addendum This Addendum was approved by TIA Subcommittee TR-42.3, TIA Engineering Committee TR-42, and the American National Standards Institute (ANSI). ANSI/TIA reviews standards every five years. At that time, standards are reaffirmed, withdrawn
28、, or revised according to the submit-ted updates. Updates to be included in the next revision should be sent to the committee chair or to ANSI/TIA. Contributing organizations Many companies within the telecommunications industry (including manufacturers, consultants, end users, and other organizatio
29、ns) contributed their expertise to the development of this Ad-dendum. Annexes There is one annex to this Addendum. Annex A is informative and is not considered part of this Addendum. Introduction Pathway systems provide the required protection and support for cables as well as creating de-fined rout
30、es for the cabling. There are standards for remote powering over communications ca-bling that eliminate the need to install a separate electrical cable to the powered device. Power over communications cabling can cause temperature rise in the cabling leading to reduced transmission performance and d
31、egradation of the cable itself if the temperature rating is ex-ceeded. Pathways are an important consideration since they will impact the temperature rise in cables. There are several different types of pathways ranging from non-continuous supports to sealed conduit. Each pathway has different therm
32、al characteristics and can lead to different tempera-ture rise of the cables contained by the pathway system. Careful selection of pathway systems together with best practices for installation of the cabling can improve thermal performance and reduce the temperature rise of the cables. This is impor
33、tant to reduce the risk of cable tempera-ture exceeding the temperature rating of the cable. This Addendum describes different pathway types regarding their ability to dissipate heat and includes installation guidelines to improve overall thermal performance of the pathway system. The factors that a
34、ffect thermal performance include: characteristics of pathways; separation of cables within the pathway systems to improve heat dissipation; pathway system design and fill factors; and installation practices (e.g., bundle size, routing). ANSI/TIA-569-D-2 iii Metric equivalents of United States custo
35、mary units The dimensions in this Addendum are metric or United States customary with approximate con-versions to the other. Life of this Addendum This Addendum is a living document. The criteria contained in this Addendum are subject to re-visions and updating as warranted by advances in building c
36、onstruction techniques and tele-communications technology. ANSI/TIA-569-D-2 iv THIS PAGE INTENTIONALLY LEFT BLANKANSI/TIA-569-D-2 1 1 SCOPE This Addendum provides guidelines for pathway systems supporting copper telecommunica-tions cabling used for remote power delivery. This Addendum may be used to
37、 assist in the design of pathway systems for new installations, and also for optimizing the use of existing pathway systems for better thermal performance. 2 NORMATIVE REFERENCES None. 3 DEFINITIONS, ACRONYMS AND ABBREVIATIONS, UNITS OF MEASURE 3.1 General The generic definitions in this clause have
38、 been formulated for use by the entire family of tele-communications infrastructure standards. Specific requirements are found in the normative clauses of this Addendum. 3.2 Definitions For the purposes of this Addendum, the definitions of ANSI/TIA-569-D and the following apply: cable bundle: A grou
39、p of cables that are tied together or in contact with one another in a closely packed configuration for at least 1m. catenary wire: A suspended strength member to which single or multiple cables may be attached to span an open space. remote power: SELV LPS power supplied over telecommunications cabl
40、ing. 3.3 Acronyms and abbreviations For the purposes of this Addendum, the acronyms and abbreviations of ANSI/TIA-569-D and the following apply: LPS Limited Power Source SELV Safety Extra-Low Voltage TSB Telecommunications Systems Bulletin 3.4 Units of measure For the purposes of this Addendum the u
41、nits of measure of ANSI/TIA-569-D apply. ANSI/TIA-569-D-2 2 4 THERMAL CHARACTERISTICS OF PATHWAYS There are many pathway characteristics which influence the heat dissipation of cables carrying power. Several aspects of geometry and materials have a significant role in the heat transfer from the cabl
42、es to the ambient air. Pathway types vary widely in these characteristics which makes it helpful from a design perspective to rank them. It is also important to note that path-way selection is driven by other factors, including physical security. Pathways can be characterized for thermal performance
43、 based on several attributes including: shape; material; coatings; thickness; channels providing cable separation; contact area between pathway and ambient air; contact area between cables and pathway; ability to control number of cables; installation factors; and design factors. A wide variety of p
44、athway types are specified for telecommunications cabling systems. They differ in regard to geometry and contact area between cables, pathway, and air. Consult with manufacturers for specific information on particular pathway systems. Table 1 shows the relative heat dissipation effectiveness of vari
45、ous pathway types (excluding cable trays) depending on cable quantity and bundling state. The effectiveness is ranked in terms of low, medium and high, where high is better. Table 2 shows the relative heat dissipa-tion effectiveness of cable trays including the effect of tray type and tray depth. Ta
46、ble 1 Heat dissipation effectiveness of pathways (excluding cable trays) Pathway Type Cable RoutingCable Quantity 1-37 38-61 62-91 91 Non-continuous Bundled High High High N/A Unbundled High High High N/A Conduit (metallic and non-metallic) Bundled Low Low Low Low Unbundled Medium Low Low Low Sealed
47、 conduit Bundled Low Low Low Low Unbundled Low Low Low Low ANSI/TIA-569-D-2 3 Table 2 Heat dissipation effectiveness of cable trays Tray Type Fill Depth, in (mm) 1 (25) 2 (50) 3 (75) Wire mesh/ladder High High High Ventilated High Medium Low Unventilated Medium Medium Low 4.1 Non-continuous supports
48、 Non-continuous supports are an open support system installed with appropriate interval spac-ing. Non-continuous supports are intended to typically support up to medium cable quantities in ceilings or below raised floors. They are available in various forms (e.g., J-hooks, fasteners) and materials (
49、metallic or nonmetallic). Another inherent characteristic of non-continuous sup-ports is the smaller relative capacity which inherently minimizes the cable quantity and the con-centration of heat-generating cables. The use of non-continuous support maximizes exposed surface area of cables which provides for improved convection due to airflow in the environment surrounding the cables. Unlike pathway types which are enclosed, non-continuous supports allow ambient air to completely surround cables. 4.2 Cable tray Several types
