We got a new internet provider and a new router/modem and i knew that in my old configuration, which was a very long cable from the telephone splitter to the router, was a bad thing.
Everytime i had some instable connection (happened rarely though), the customer support ALWAYS claimed it was caused by the bad position of my router.
So i decided to make sure that that wouldnt happen anymore and installed the router close to the telephone line.
The problem is that the wireless on my PC and PS3 (which are 3 floors away from the router now) are pretty shitty, and I want to connect them again with UTP cables. I want to get a 20m UTP cable and then "split" them in my room to my PC and PS3, but i get a lot of different answers on what i need. i.e. another router (seems plausible) , a switch or a UTP splitter
TL;DR, what do i need to get from 1 UTP cable to 2 UTP cables
See my awesome paint layout below:\



