The UART standards didn't specify bit rates - which allowed the same standard to scale all the way from 300 bps in the 1960's all the way up to 10+ megabps in the 90's.
Why can't POE standards do the same?
Simply don't set voltage or current limits in the standard, and instead let endpoint devices advertise what they're capable of.
Why can't POE standards do the same?
Simply don't set voltage or current limits in the standard, and instead let endpoint devices advertise what they're capable of.