Power management features and integration Power over Ethernet

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avaya ers 5500 switch 48 power on ethernet ports


advocates of poe ethernet alliance expect poe become global long term dc power cabling standard , replace multiplicity of individual ac adapters, cannot centrally managed.


critics of approach argue poe inherently less efficient ac power due lower voltage, , made worse thin conductors of ethernet. typical 48-port ethernet switch has 50 w 80 w power supply allocated ethernet switch electronics. on , above this, requires typically 740 w (for 802.3af) 1480 w (for 802.3at) power supply allocation poe ports, permitting maximum draw on each. however, central supply replaces several dedicated ac circuits, transformers , inverters, power loss of long thin dc cable can justifiable. in many case, power can introduced device directly ac power available.


switch power features

the switches contain active , smart , or managed power management features reduce ac draw of devices involved.


multi-protocol teaming standards (g.9960, g.hn, , ieee p1905) , handoff standards (ieee 802.21) rely on simulating ethernet features in other media.


by late 2011, of energy management features proprietary. advertising power-over-ethernet devices cites green features including less packaging , improvements on previous models.


integrating eee , poe

after integration ieee 802.3az energy-efficient ethernet (eee) standard, energy management capabilities of combined standard expected good. pre-standard integrations of eee , poe (such marvell s eepoe outlined in may 2011 white paper) claim achieve savings upwards of 3 w per link, extremely significant across tens of millions of new links shipped each year. these losses significant higher power devices come online. marvell claims that:



evolution of poe low power source (up 12.95 w per port) 1 devices of 25.5 w, direct current (dc) power losses on ethernet cables increased exponentially. approximately 4.5 w/port of power wasted on cat5, cat5e, cat6 or cat6a cable...after 100 m... eee typically saves no more 1 w per link, addressing 4.5 w per link loss poe transmission inefficiency provide more incremental savings. new energy-efficient poe (eepoe) technology can increase efficiency 94% while transmitting on same 25 ohm cable, powering ieee 802.3at-compliant devices in synchronous 4-pairs. when utilizing synchronous 4-pairs, powered devices fed using available wires. example, on 24-port ieee 802.3at-2009 type 2 system (delivering 25.5 w per port), more 50 w saved.




^ gs108pe . netgear.com. retrieved 2013-06-01. 
^ roman kleinerman; daniel feldman (may 2011), power on ethernet (poe): energy-efficient alternative (pdf), marvell, retrieved 2016-08-31 






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