Networks Built-in Cat5 w/ new router & DSL setup

I have a small office which has cat5 built in already. We could transfer data fine between PCs but used seperate dialup on each. Now we get DSL. I didnt know how to get it shared between boths PCs so i bought a 4 port router thinking I could hookup the DSL to it and then 1 direct Cat5 line to 1 pc, and then run a cat5 from the routher through the built-in CAT5 (between walls) and then from the Ethernet wall jack to the 2nd pc.

For some reason that doesnt work. The light doesnt even turn on to show a connection to the 2nd pc. It has to do with the built-in CAT5, but I dnt know what the problem is.

Any one got any suggestions, I really gotta get this workin. THanks.

 

Maybe that cable in the wall is wired for crossover

Pull off the wall plates and check that each side matches. Or if you're lazy just get a crossover cable from the wall to the PC

 

what is a crossover cable?

 

A crossover cable swaps the RX (recieve) and TX (Transmit) lines on one end, so that you can hook up 2 PCs directly. Or with a crossover cable you can connect 2 hubs/switches/router via 2 non-uplink ports. If you look at the patch cables and the colors are in a different order, it should be a crossover cable (or a miswired one ) If they are the same, it is a normal patch cable.

If you went <comp1>---<wall>---<comp2> beforehand, then the wall cable is probably crossover. You need another crossover cable to make it normal again, use the crossover between comp2 and the wall, that way you have all normal cables in the router.