Hello EmsTatay!

11 Feb 19 16:22, you wrote to me:

 Em> Thanks for your thoughts. In this setup there would be only ONE Power
 Em> Supply feeding the PoE Switch (that was the request/wish/idea of the OP)

 Yes, that is also the attraction to me.

 Em> The splitter I mentioned above eliminates the problem with the HAT...
 Em> Whilst the splitter will use the extra wires for the PoE function, my
 Em> PI-2 and PI-3 are limited to 100Mb/s (NOT MHz ;-) - so not a problem or
 Em> performance limit.

 The POE-Pihat, seems to be limited to 100Mb/s as well. Strange, as it is
 meant for the Pi3+ wich has a Gb/s interface. It is still limited to
 USB2 speeds.

 Em> According to 802.3af the data function of the wire AND PoE fucntion
 Em> "can" coexist. Thus you need a G-Bit Switch with PoE function and if
 Em> your (future) PI supports G-bit ... the splitter needs to do the same.

 I use a Netgear Prosafe GS108PE, it supprts POE only on 4 ports. All 8
 ports are 1Gb/s.

 Em> I agree that the < CAD 40 4 pack I linked does NOT specify Gigabit
 Em> compliance and likely only supports 100Mb/s- However, THE following
 Em> model DOES support G-bit (please note I am not a seller or affiliated
 Em> with any of the product):

 Em> https://www.amazon.com/UCTRONICS-PoE-Splitter-Gigabit-Raspberry/dp/B07CNKX
 Em> 1 4C

 Interestign, up till now I only searced local suppliers and found no
 splitters with support for 1Gb/s

 Em> (of course this one is $15 (US) ... I am sure it can be found for a
 Em> better price...

 Possibly.

 Em> I think this would be a viable/stable setup. (Only ONE reviewer reports
 Em> undervoltage on his PI(s) and I suspect that this is likely due to his
 Em> sizing of the PoE supply rather than the splitter. )

 I only encoundered undervoltage with the Pi-hat POE. I am not sure if it is
 a version v1 or v2.

Kees

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