Looking for a bit of help with power over ethernet

On 2019-11-17, Peter <nospam@nospam9876.com> 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.