network wiring problem

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http://forums.anandtech.com – Hi! I think I have a pretty specific problem, so that's why I'm opening a new thread. I'm trying to connect two computers (one located in the 1st and other in 3rd floor) with the router (in the 2nd floor). So basically, the distance between the router and the computers is around 15m-20m (60ft). I've made the CAT cables by myself, of course put the colored wires in correct order, but still I'm getting no connectivity on none of the ends. Both of the computers keep showing the ethernet cable is disconnected. The light on the ethernet port blinks in a cca. 10-second interval. For me it seems li (Hardware)