First of all I have to be clear, I am not interested in solutions including wireless (wifi) technology.
My modem-router (old fashioned - discontinued- wireless) is located on first floor and connects to 2 laptops to the internet. The first laptop is near the modem (but not near enough to plug in my "usbA to usbB" cable). I have it connected using cat5 ethernet cable. The other laptop is going be located 12m away from the modem (cable travelling through furniture, stairs and rooms).
There is not other ethernet port left on the second laptop (the modem has only one, plus an usbB port).
I thought of buying 15m usbA to usbB cable (with repeaters on) to do my job but that is expensive, troublesome and time consuming. The reason I am asking your opinion is that I already have installed a telephone cable between the 2 locations and I own a second modem-router. So, is there any way to use that telephone line to connect my 2 modems and my 2nd laptop in some way so to have access on internet?
One last thing: the modem (DSL line) is connected to telephone jack via cat5 cable, passing through a small adapter device (DSL splitter I think). I also own rj45 to rj11 adapters and rj11 to rj11 connector and a "DSL and telephone line" splitter I think. If I buy 15m cat5 cable and use a hub/switch is possible but troublesome solution, so it is excluded.