I am not sure how to explain this without a picture, but the data cable that is connected to my phone seems to have 3 ends to it.One to the phone itself, and 2 other plugs.I know one of the 2 goes into the wall jack, but where does the other one go.?And is it ok to leave the other one unplugged.?Does that create any problems if I use a DSL filter with that 1 plug not used?
Dsl filter should be used in-line with the wall jack and phone. Using it on an unused line would not do nor will it cause any problems. As for where the other one goes, you would have to trace that cable from one end to the other. A normal phone cable would have 2 - 3 pairs in it for plain phone lines. A normal data cable would have 4 pairs in it. Both normally would have 1 end on each end. Custom ends can be made for some applications. I have made a few for testing purposes and even using it for RCA audio for my pc speakers.
