Back in August 2021, I did a teardown of an Ubiquiti Networks power-over-Ethernet (PoE) injector, following up on the dissection of a TRENDnet PoE-supportive powerline networking adapter set from ...
PSE outputs are limited to 15.4 W per RJ-45 port. Because longer Ethernet links exhibit a significant drop, voltages as high as 57 VDC may be used with PoE injectors. Electrical specifications for PoE ...