XE3-4 difference between PoE+ (802.3at) and PoE++ (802.3bt)

Hi there.
I am looking for the advantage when operating a XE3-4 Access Point with PoE++ instead of PoE+. The data sheet only says that Bluetooth will be activated (what for??) and that the USB-Port will be activated. Except these features I see no difference. So my question is could there be a performance difference when using PoE++?


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XE3-4 has a maximum dc power consumption just over 802.3at which is 25.5W at the Powered Device (in this case the XE3-4 AP), but if you only have 802.3at (which is sometimes referred to as PoE +) then the USB port and BT radio will automatically be disabled. The USB port is designed to source up to 700mA at 5V to a dongle device while the BT radio can draw a few hundred mW (so small). PoE ++ refers to 802.3bt so more than 802.3at (25.5W). So you are right the only differences will be the enabling of the BT radio and the USB port. No changes to wifi radio operation.