See one power-over-Ethernet product and you’ve seen ‘em all, right? Not quite. Here is a Tycon Passive PoE injector teardown.

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 ...