forgot to mention that it does work with a 5 port Netgear switch attached to the SG108E, no speed loss there

Thanks for the answer, I will try after work and give feedback

I already have three TL-SG105E and they all wor great (they are V4 and below). Now I bought another one wich is V5 to extend my network i connetc it to an already existing TL-SG108E and from there to...