Difference among IEEE802.3af,at,bt, High Power PoE

Feb 21, 2019

Power over Ethernet(PoE) develop rapidly, more and more popular and ripe. IEEE802.3af PoE  is 15.4 Watts, IEEE802.3at PoE is 30 watts, now, IEEE802.3bt PoE is from 45 watts and up to 100 watts.

 

802.3af delivers power over 2 pairs output which is 4/5,7/8, the other 2 pairs 1/2, 3/6 deliver data.

802.3at delivers power over 2 pairs output as well, which is usually 4/5,7/8, the other 2 pairs 1/2, 3/6 deliver data, Or the other version is 1/2,3/6 deliver power while 4/5, 7/8 deliver data accord to your need.

802.3bt 45W delivers power and data as the same as AT’s, but more than 60 watts, 4 pairs deliver both data and power.

 

802.3af PoE usually power 12.95W PDs, such as IP cameras, VoIP phones, Wifi Access Points, 802.3at PoE+ usually Power 25.5W PDs, such as IP cameras, VoIP phones, Wifi Access Points, Thin/Zero client, Door locks, Information Kiosk, POS and backwards compatible with IEEE802.3af.

802.3bt PoE++ is ultra PoE, which can power high-power PDs up to 100 watts, such as PoE LED, Displays, Microwave radio, any high-power PoE devices and also backwards compatible with IEEE802.3af/at.


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