'IEEE 802.3at PoE Plus Operating Efficiency: How to Keep a Hot Application

  Running Cool' was developed to help network professionals select cabling

 capable of supporting PoE Plus with minimized risk of degraded performance

                        due to elevated temperature



    WATERTOWN, Conn., July 28 /EMWNews/ -- Siemon is proud to launch a

new technical whitepaper by noted cabling expert Valerie Maguire (Rybinski)

entitled "IEEE 802.3at PoE Plus Operating Efficiency: How to Keep a Hot

Application Running Cool". This new whitepaper is available for download

at: http://www.siemon.com/go/POE



    With the pending PoE Plus Standard nearing completion and attracting

global interest, attention has been focused on temperature-related issues

inherent to transmitting higher levels of power over twisted-pair cabling.

This current-induced temperature elevation increases the risk of degraded

physical and electrical performance, which can impact overall network

performance and reliability.



    Maguire's comprehensive 8 page white paper provides an in-depth

analysis on the nature and causes of cabling temperature increases in PoE

Plus applications, dispels some commonly held heat dissipation myths and

provides actionable guidance on selecting PoE Plus-capable cabling.



    Excerpt:



    "Good heat dissipation performance exhibited by the cabling plant is

especially critical since no methods exist today for monitoring temperature

rise in an installation or mitigating a high-temperature environment.

Historically, a comfortable level of performance margin is considered to be

50% headroom to Standards-specified limits (this would be equivalent to 6

dB headroom for a transmission performance parameter). Following these

guidelines, the solutions that offer the most desirable levels of heat

dissipation headroom in support of the PoE Plus application are category 6A

F/UTP and category 7A S/FTP cabling systems.



    Highlights and conclusions:



    -- Although safe for humans, the 600mA currents associated with the PoE

Plus application generate heat in the installed cabling plant.



    -- Excessive temperature rise in the cabling plant cannot be tested or

mitigated in the field.



    -- Excessive temperature rise in the cabling plant can result in an

increase in insertion loss and premature aging of jacketing materials.



    -- Choosing media with improved heat dissipation performance can

minimize the risks associated with excessive temperature rise.



    -- Category 6A F/UTP cabling systems dissipate almost 50% more heat

than category 5e cabling.



    -- Category 7A S/FTP cabling systems dissipate at least 60% more heat

than category 5e cabling.



    To download an electronic copy or order a hardcopy of Siemon's "IEEE

802.3at PoE Plus Operating Efficiency: How to Keep a Hot Application

Running Cool", including complete heat dissipation performance data for

category 5e UTP, category 6 UTP, category 6A UTP, category 6A F/UTP, and

category 7/7A S/FTP cabling, visit: http://www.siemon.com/go/POE

    About the author:



    Valerie (Rybinski) Maguire holds the position of Global Sales Engineer

at The Siemon Company. Maguire received her B.S.E.E. degree from the

University of Connecticut and actively participates in working groups

responsible for the development and publication of telecommunications

standards such TIA/EIA-568-B, TIA/EIA-568-B.2-1 (category 6), and newly

published TIA-568-B.2-10 (category 6A).



    Maguire is the chair of the TIA TR-42.7 copper cabling sub-committee,

TIA TR-42 appointed liaison to IEEE 802.3, and document editor for the next

edition '568-C.2 Standard. In addition, Maguire is a frequent speaker at

industry conferences. She has authored over 45 technical articles and

engineering papers and holds one U.S. Patent.



    About Siemon



    Established in 1903, Siemon is an industry leader specializing in the

manufacture and innovation of high quality, high-performance network

cabling solutions. Headquartered in Connecticut, USA, with global offices,

manufacturing and service partners throughout the world, Siemon offers the

most comprehensive suite of copper (unshielded and shielded twisted-pair)

category 5e, category 6 (Class E), category 6A (Class EA) and category 7/7A

(Class F/FA), and multimode and singlemode optical fiber cabling systems

available. With over 400 active patents specific to structured cabling,

from patch cords to patch panels, Siemon Labs invests heavily in R&D and

development of industry standards, underlining the company's long-term

commitment to its customers and the industry.