On 10/02/2019 23:05, Kees van Eeten wrote:
> Hello EmsTatay!
>
> 11 Feb 19 10:18, you wrote to Rick Christian:
>
>   > Hi Rick,
>   > reading your requirements and wish to eradicate he pesky warts from
>   > your
>   > life...
>   > My first thought was to use R-Pi PoE HAT. However, seems that there is
>   > a problem with their function and AFAIK they have been recalled/put on
>   > hold.
>
>   An elegant solution, I found the horror stories to be true.
>
>   > A practical (and may be even cheaper) alternative to the HAT would be
>   > to
>   > use a PoE splitter with a 5V 2.4A supply (4 pack on amazon < CAD 10
>   > ea).
>   > Use the already existing Cat5 cabling, add a suitable PoE supply unit
>   > and hook up as many of your Pi's as the PoE adapter allows.
>
>   That works o.k. but it moves the warts to the vincinity of the RPI.
>   Ethernet speeds are limited to 100Mhz, as the four extra wires are not
>   passed from one side of the splitter to the other.
>
>   There could be models, that do.
>
>   > Haven't tried it myself -
>
>   I did.
>
>   > but that might be one way to solve what you would like to achieve.
>
>   Who knows.
>
> Kees
>
Hi Kees!

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

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

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

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

https://www.amazon.com/UCTRONICS-PoE-Splitter-Gigabit-Raspberry/dp/B07CNKX14C

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

It should be noted that the Switch must support the power requirements
of the number of R-PI's you will connect. It is noteworthy that PoE
input is around 48V and would be stepped down by the splitter to provide
the 5VDC for the PI.

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

Greets/J

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