The guy from Covad who initially delivered the Earthlink DSL modem said the individual phone line filters are usually not necessary. It's an FCC rule regarding an occasional problem that most folks don't have, or so he suggested.

I'd already been dragging wires for a star-shaped phone system and that's why the Covad guy could put in the dedicated line, it was already in place (we're still mostly limping along with the old lines, but I'll finish this one of these days--I have a 66-block in the hall closet, and that's where the DSL line runs from). I did a similar setup for the Dish Network. I can change rooms the cable goes to by hooking up the different rooms at a central point at the top of my attic stairs.

SRS