Looking for a bit of help with power over ethernet

Started by Peter November 15, 2019
On 2019-11-17, Peter <> wrote:
> Does anyone know if POE injector products apply power to 4,5 and 7,8 > permanently, or whether they implement the "negotiation" using the > resistor value? > > I would be surprised if passive injectors implemented anything like > that. That more or less needs a microcontroller, to briefly apply some > voltage and see the current drawn. Or one of the pricey POE controller > chips from the likes of Linear Technology.
the passive ones just squirt power onto the line. -- When I tried casting out nines I made a hash of it.