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Do ethernet cable signals deteriorate the longer the cable is? I need to purchase an etheret cable to connect a second computer in my house, planning on running it through the attic. The wireless I am using is far too slow. My question is this, do the cables not work as well the longer they get? I estimate I will need about 20-30 feet of ethernet cable to do what I am trying to. And am worried that with that log of an ethernet cable, it won't work.
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Perhaps you can find a better answer on a forum which is specifically for cabling/IT related questions, but in general up to 300 feet should work fine over CAT-5 ethernet cable.

Joris