2 ms·

Poe is great for many things, but it’s not as efficient as direct connection (for both low and high power.)

• rjdj377dhabsn 1y ago
  Why's that?
  • jansper39 1y ago
    You have to convert the power to 48v and back down to whatever you need on the other end which has losses, plus you have losses over the cable too.
    • rubatuga 1y ago
      Well quite frankly 48V has lower losses than 12V
      • shadowpho 1y ago
        110v -> 48v (long thin cable) -> 12v Versus 110v (long thick cable) -> 12v Top has more conversions and more current running on smaller gauge
  • shadowpho 1y ago
    At higher power the Ethernet drops quite a bit of voltage/power compared to the wiring in your walls. Furthermore 48v vs 110v is double the amperage/more loss on top of that. Then there’s double/sometimes triple conversion (120:48 and then 48:dc; 120:48 and then 48:12, and then 12:dc). Furthermore magnetics are a must on both side of the PoE which also isn’t great. At lower power there’s more circuitry to run and multiple conversions aren’t great compared to a simple cheap flyback. For more technical feel free to check here, although it isn’t quite end to end: https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/204/slva498.pdf https://e2e.ti.com/cfs-file/__key/communityserver-discussion...
• foofoo12 1y ago
  That's pretty much stating the obvious. X is great for many things, but it’s not as efficient as Y. Life is a balance between inefficiency and inconvenience. Throwing that statement in without actual numbers is just derailing the conversation.