Use 802.3at PoE clients in a 802.3af PoE switch

power-over-ethernet

I am about to buy and install a 802.3af PoE switch (probably a NETGEAR ProSafe FS728TP) that will power some Arduinos with PoE ethernet shields that is also 802.3af.

How future safe is this?

Let's say that I in the future would like to install some surveillance cameras (PoE powered) on this network do they need to be 802.3af or will newer clients with PoE versions like 802.3at also work?

Best Answer

The client specs call for PoE+ / at for a reason - it needs to pull more than the 15.4W that an af switch is supposed to provide. If things go wrong you could be looking at damaged equipment. Even if it comes up you're pushing your switch past specified tolerances, which pretty much means a postponed failure.

If you want to run PoE+ on a PoE switch then get a PoE+ injector.

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