The major difference between 802.3af (
PoE) and 802.3at (
PoE+) is that
PoE+ PSEs can provide almost twice as much power over a single Ethernet cable.
PoE+ PSEs can supply power to both
PoE and
PoE+ PDs, but
PoE PSEs can only supply power to
PoE PDs.
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802.3bt Active PoE IEEE standard that provides a maximum of 60W (type 3) or 100W (type 4) at the PSE. 24V Passive PoE Provides 24V power. 48V Passive PoE Provides 48V power.
