On Sun, 29 Jul 2018 21:22:01 +0200, Axel Berger wrote:

> Dave Liquorice wrote:
>> until the sending end has had a chat with the far end
>
> How does an unpowered peripheral talk or listen?

with some very clever electronics. the exact details of which are beyond
my level of expertise.

https://www.ieee.li/pdf/viewgraphs/introduction_to_poe_802.3af_802.3at.pdf
should provide the details if you really want to know

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