802.3af provides power on two of the four pairs. Which pair is
determined by whether it is mode A or mode B.
I think the "conservative" version is mode B, since it puts the power on
pins 4/5 (+) and 7/8 (-). Mode A is pins 1/2 (+), and 3/6 (-).
A device NOT expecting power on pins 1/2 or 7/8 will likely let the
smoke out.
Here's the skinny from Wikipedia:
bp
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On 5/4/2017 11:37 AM, Jay Weekley wrote:
Is it possible to power a Unifi UVP VoIP phone with a Mimosa power supply? We
have one that didn't come with a 48
volt power supply but we have extra Mimosa power supplies laying around. The
Unifi phone is 802.3 af compliant.
The Mimosa power supply lists 3/6 and 4/5 as positive and 1/2 and 7/8 as
negative.
