Hi there, this is my setup I recently installed 3 PCs downstairs in my church. Upstairs in the office I have my dsl modem connected to my linksys router that has 2 PCs already connected. I ran CAT-5 cable from upstairs to downstairs, i just ran the cable i have not attached the RJ-45 clips to it. I bought a linksys 5-port switch for downstairs to connect the 3 PCs in order to be internet accessible. My question is the cable that i ran from the office upstairs to downstairs do i make that a crossover cable that plugs into the switch? Also to connect the 3 other PCs do I have to connect them with a crossover cable as well? I am unsure if i use a crossover cable or a straight-thru cable, your help and advice would be much appreciated to this confused individual, thanks!