Re:The Rock 5B is not a Raspberry Pi killer–yet
by dragontamer on Wednesday February 01, 2023 @03:23PM
(#34617049)
> I'm a little puzzled how they put 77 volts on something rated by the fire dept and NEC as "low voltage" but that's not my paygrade LOL.
The newer standard uses all 4 twisted pairs, so its 71W power / 48V / 4 wires == 370mA on the average on each pair of wires. Though "worst case" 960mA due to unbalanced power draw it seems.
The 4PPoE standards also run with 1Gbps protocol, meaning all 4 twisted pairs are data. So all 4 are data + power. I'm not quite sure how it all works electrically... though I loathe to be the guy to design the splitters to pull power evenly from 4 different pairs.
The newer standard uses all 4 twisted pairs, so its 71W power / 48V / 4 wires == 370mA on the average on each pair of wires. Though "worst case" 960mA due to unbalanced power draw it seems.
The 4PPoE standards also run with 1Gbps protocol, meaning all 4 twisted pairs are data. So all 4 are data + power. I'm not quite sure how it all works electrically... though I loathe to be the guy to design the splitters to pull power evenly from 4 different pairs.