Hello, so I don't know much about ethernet connections and such and I have a problem. In my house from the modem and the computer there is a wall and some obstacles, and a long cable that goes throught into my PC. Now I want to add a second PC and I figured that a Ethernet splitter was what I needed so I bought 2 cheap Rj45 coupler like This and run a 2-1-2 connection but it doesn't work. What am I doing wrong? What would be a nice solution ?