@Kevin_Z Tahnk you so mush

@Kevin_Z Hello, Thank you for your reply, yes there is a RJ45 connection at each floor which connects to the main router directly.

Dear All, My house have 3 floors, each floor have a RJ45 connected to my Internet-box. I would like to change my WFI routeur, and connect in each floor a repetior directly connected in RJ45 to the...