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PoE Plus Enabling IP convergance over twisted pair cabling

PoE Plus Enabling IP convergance over twisted pair cabling. PoE Plus. Definition Standards Advantages/Drawbacks Modelling Cabling Options Benefits of higher graded Cabling. PoE : what is it?.

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PoE Plus Enabling IP convergance over twisted pair cabling

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  1. PoE PlusEnabling IP convergance over twisted pair cabling

  2. PoE Plus • Definition • Standards • Advantages/Drawbacks • Modelling • Cabling Options • Benefits of higher graded Cabling

  3. PoE : what is it? • Power over Ethernet describes any system to transmit electrical power along with data over standard twisted-pair cable in an Ethernet network. • The IEEE802.3af standard provides the capability to deliver both power (max 12.95W) and data over standard ethernet Cat.3/Cat.5 cabling.

  4. Working principle

  5. USB/Firewire/PoE

  6. Actual applications • Power supply <13W • IP phone • Webcam • Wifi Accesspoint

  7. Future applications? • Charge of a laptop • Providing both power supply and internet connection in trains and planes • Peripheral devices : screen, printer, home theatre… • Power backup for PC • Power supply for specific PC

  8. Examples of power consumption

  9. Advantages • Advantages : • Only one cable to carry datas and power • Up to 100m • Ethernet connector standard (RJ45) is widespread • Compatible with Gigabit Ethernet (1000BASE-T) • centralized backup power

  10. Challenges and Answers • Learnfrom the challenges at the beginning and how they have been answered • Data cables are not made for this use (copperconductors are toothin, • 24 AWG = diameter of 0.5106 mm) • Higher power levels over thincoppercableslead to temperaturerise in cables • What are the limits ? • Do weneed new cables?

  11. Nexans Thermal Modell • 3D Modelling Project in Nexans Research Center, France

  12. Nexans Modelling Results (1) • Heating of Ethernet cable depending on the category

  13. Nexans Modelling Results (2) • Heating of a bundle of cat5e ethernet cables

  14. Nexans Modelling Results (3) • Power of 1A results in ~10° temperature rise in a bundle of 19 cables

  15. Results for Cat5e UTP cable (Worst Case) • Cat5e UTP usable if bundle size <100

  16. ISC SC25 / POE Ad Hoc Result • ISO SC25 Temp. Rise Data provided to IEEE • For 100 cable bundles Cat5 UTP minimum: all pairs energised

  17. IEEE Choice • Maximum acceptable Temperature Rise = 10° • Max maximum rating for cable = 60° • Max temp for equipment / ambient temperature = 45 ° = 15° Max. • Including some tolerance finally 10° Temperature Rise accepted • Leads to limitation to 25 Watts • 10° TR equals 600 mA • using 57 Volts  24/25 Watts Limitation (using 2-pairs only) • 50 Watts target only achievable with 4 pairs but this is patented technology • No licenses available (PowerDesign)

  18. IEEE Standards • The existing standard : IEEE802.3af (PoE) • 48V DC over two pairs of cat3/cat5 ethernet cable • 400mA per pair • 12.95W (with losses) • The future standard : IEEE 802.3at (PoE Plus) • Uses the up to four pairs of cat5e cable • 57V DC • 600mA per pair • Up to 25.5W

  19. ACHIEVEMENT • FINALLY: • POE PLUS is possible with ALL Copper LAN Cables !! • IEEE Standard based on worst case CAT5e UTP • No need for ‚thick‘ cables • Big Achievement: • Run POE PLUS and IP Convergance over existing LAN cabling • ..but some cabling can support it better than others..... • Get around some limitations and compromises made to enable worst case

  20. Benefits of better cable • Let us look into benefits of better cabling. This would potentially allow • Limit the temperature rise (and save energy for cooling(?)) • Tolerate higher power levels (some equipment oversubscribes) • To use larger bundles than 100 cables or even “bundles of bundles” • Tolerate environments at higher temperature without reaching the 60° limit when using PoE+ • Keep maximum distances (100m)

  21. POE /P 2 pairs Temperature Rise per cable grade remember to double temperature rise due to 4 pairs (IEEE) instead of 2 pair (used in comparison these chart) Almost linear behaviour from 2-4 pair!!!

  22. Temp Rise per Cable Grade Difference between AWG 23 and AWG 22 cables is 1° !!

  23. Acceptable Ambient Temperature

  24. Tolerate higher power levels Cat7A cable would allow to run ~ double power level

  25. Larger Bundle Size AWG 23 10 bundels = 331 cables AWG 22 10 bundels = 331 cables

  26. Impact on distance • All International Standards specify insertion loss requirements at 20° C and have quantified a small increase of attenuation of less than 0.2%/degree C for shielded cable and up to 0.6%/degree C for unshielded cable. • UTP Insertion Loss • Reduces by -0.6%/degree C • Example: +10° for UTP • 90m - 6% = 84,6 m link length • Example: 60° for UTP • 90m - 24% = 68,4 m link length • FTP Insertion Loss • Reduces by -0.2%/degree C • Example: +10° for FTP • 90m - 2% = 88,2m link length • Example: 60° for FTP • 90m - 8% = 82,8 m link length In High Temp envronments use higher cable grade to ensure 100m distance (application dependend f.ex. Cat5 app over Cat6 cabling)

  27. Impact for Office Cabling • High Impact estimated for Office Cabling where a frequent use of POE/P can be expected • Devices like VoIP Telephones, Sensors, Printers, thin clients, new generation laptops require pontially fully energised large bundles of cabling • Bundles Size in horizontal cabling = typically 100 FD, often larger than 100 cables • 1 Floor of 50 users equals 150 cables at 3 drops /users

  28. Summary • POE/P is a key technology to enable IP Convergence • Cat5e UTP cabling is required as a minimum • 10° temperature rise at 600mA per pair • Max. bundle size = 100 • Better cabling Higher Grade (Cat 6 and Cat7) or shielded cable allows to • Lowering the expected temperture rise • Use larger bundles sizes • Tolerate higher power level • Save energy for cooling in comms rooms • Enable full distance of 100m

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