We wanted to move our Computer station from upstairs to down stairs so I bought cable and Phone line from Lowe's to run through the attic. I got a spliter/duplicator to run off of the connection upstairs so I could leave a connection up there. Is there a differance between the DSL cable installed by comcast and the cable I bought at Lowe's? or do you have to have a special duplicator cause it's not working.
You've used several terms interchangeably and confusingly. Define: cable, phone line, splitter/duplicator. "Cable" can be almost anything. "Phone line" can be 2-wire flat, 4-wire flat, 2-wire round (twisted pair), 4-wire round (2 twisted pairs). "Splitter/duplicator" can be almost anything.
How about posting URLs to the Lowe's web site for these things?