Hello Jim!

12 Feb 19 19:28, you wrote to me:

 JJ> Then again I've not found anything that explicitly says it does work at
 JJ> gigabit!

 No, wrong conclusion from my side. I found a remark to limit the speed
 speed of the Pi3+ to 100Mb/s if there were problems with connecting.
 I remember that to be in relation with the pi POE-Hat. As usual when you
 read something on the web, you cannot find it again.

 But anyhow, there is no circuit reason why the POE-Hat could influnece
 the maximum speed of the ether net port on the Rpi3+ as it is not an
 in-between-device tah can limit the number of available wires on the
 ethernet cable.

 Anyway here is the real answer to the issues:

 https://www.theregister.co.uk/2018/09/11/raspberry_pi_poe_hat_issue/

 Sorry for the possible confusion.

Kees

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