I have this box on my wall which I assume (I have very little knowledge on this) is a DSL box. The modem is connected to the a box like this in the room it is in currently. We use optimum as our ISP and the modem they provided is arris tm822g with a Sagemcom F@st 5260 router. Could I get a cable that connects to this box and into my computer or a wifi repeater to gain close to ethernet speeds or is this not possible again I know very little about this. Any help is greatly appreciated and sorry for the rough picture, DSL box is pretty old.