poe plus enabling ip convergance over twisted pair cabling
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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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Presentation Transcript
poe plus
PoE Plus
  • Definition
  • Standards
  • Advantages/Drawbacks
  • Modelling
  • Cabling Options
  • Benefits of higher graded Cabling
poe what is it
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.
actual applications
Actual applications
  • Power supply <13W
    • IP phone
    • Webcam
    • Wifi Accesspoint
future applications
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
advantages
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
challenges and answers
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?
nexans thermal modell
Nexans Thermal Modell
  • 3D Modelling Project in Nexans Research Center, France
nexans modelling results 1
Nexans Modelling Results (1)
  • Heating of Ethernet cable depending on the category
nexans modelling results 2
Nexans Modelling Results (2)
  • Heating of a bundle of cat5e ethernet cables
nexans modelling results 3
Nexans Modelling Results (3)
  • Power of 1A results in ~10° temperature rise in a bundle of 19 cables
results for cat5e utp cable worst case
Results for Cat5e UTP cable (Worst Case)
  • Cat5e UTP usable if bundle size <100
isc sc25 poe ad hoc result
ISC SC25 / POE Ad Hoc Result
  • ISO SC25 Temp. Rise Data provided to IEEE
    • For 100 cable bundles Cat5 UTP minimum: all pairs energised
ieee choice
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)
ieee standards
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
achievement
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
benefits of better cable
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)
poe p 2 pairs
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!!!

temp rise per cable grade
Temp Rise per Cable Grade

Difference between AWG 23 and AWG 22 cables is 1° !!

tolerate higher power levels
Tolerate higher power levels

Cat7A cable would allow to run ~ double power level

larger bundle size
Larger Bundle Size

AWG 23

10 bundels = 331 cables

AWG 22

10 bundels = 331 cables

impact on distance
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)

impact for office cabling
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
summary
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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