Powerdsine IEEE802.3 Manuale Utente Scaricare il pdf (Pagina 6)

PowerDsine Presentation October 2005 Page 6

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PoEp minimum voltage

 Let us look on this issue under another angle assume minimum load need

to be delivered to PD by four pair is 40W

 Power dissipation on a cables for 51V PSE will be 2.45W less then for 44V

 Advantages of higher voltage is increase with increasing power level

0.890.84System efficiency

for ~500W PSE PS

44.88W47.52WPSE power

4.85W7.3WPower dissipation

on a cables (4P)

0.44A0.54ACurrent per pair

40W40WPd power

51V44V

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Powerdsine IEEE802.3 Manuale Utente Pagina 6