alt Hacker NewsIn case anyone was wondering, the -48V was chosen to reduce electrolytic corrosion and is the approximate voltage of a 24S lead acid battery. Later, PoE inherited this voltage standard.
In case anyone was wondering, the -48V was chosen to reduce electrolytic corrosion and is the approximate voltage of a 24S lead acid battery. Later, PoE inherited this voltage standard.
The important part about corrosion protection is that the voltage is negative with respect to the ground. The absolute voltage is more for distance, and low enough to be safe. Nice read for those who are interested: https://pe2bz.philpem.me.uk/Comm/-%20Telephone/Info-901-Tele...