Ok, what is the difference between a Filter and a Splitter eh?
Well, they both do the same thing, they filter the DSL signal out from things that should not see the signal. The difference is in the packaging. The first inline filters just had a plug on one side and a jack on the other. You unhooked your phone from the wall jack, plugged it in to the filter jack and plugged the filter into the wall. Thus you inserted the filter between the DSL signal at the wall jack and the phone, and it kept the DSL signal out of the phone and the phone from shorting out the DSL signal. Now if you have a newer type filter that has 2 jacks, one marked VOICE and one marked DSL, you could think of it as a splitter. In truth all the DSL jack is is an extra connection off the plug fed straight through from the wall, so you have an extra jack to plug your DSL modem into. Also, filters installed at the NID are referred to as splitters, as they filter out the DSL signals from the wires split off of the main phone line.
