POE - question about "compatibility"

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ok, compatibility isn't right word.

couple of questions:
my arduino (ether10) has poe.  power input - right?
there arduino poe "hub" thing jaycar sells there 4 cat-5 ports have poe.
i therefore read as:
if have 4 arduino cards cat-5 ports, can power them , have them networked.
that way save needing 4 power supplies, 1 "central" 1 feeds 4 boards.
so begs question:
say have less 4 cards, , want them on own little network, want them connecte "larger" network isn't on.
i have big hub/switch/thing spare hole other "arduino bunch of cards" connect.

will there problem if device has poe , plug cable arduino poe card?

it still "work in progress may happening in future.  thought better ask can understand problems before happen.

sorry, p.s.
my larger lan gigabit network poe - think has poe.
the power supply may dead says has poe.



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