On 29.7.18 21:40, Dave Liquorice wrote:
> On Sun, 29 Jul 2018 16:36:48 +0100, Richard Ashbery wrote:
>
>> I would be a little concerned about loading my ethernet cable with say a
>> Raspberry Pi but I guess some of you are finding it works OK.
>
> With proper PoE the full 48 V is not present on the cable until the
> sending end has had a chat with the far end to see if it wants power.
> It's perfectly safe to plug anything onto a proper PoE supplied
> cable.
>
> This is not the case with passive PoE, where the full power is
> present all the time.


In PoE, the feed is between the transmit and receive pair centerpoints.

A proper Ethernet interface has transformers on both pairs, so supply
feed in a normal network card is not an issue.

--

-TV

--- SoupGate-Win32 v1.05