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The DSL signal occupies a wide band of frequencies above the
voice range. To make sure that you don't hear interference in
phone calls, you plug a little filter between the line and each
telephone. The modem installation kit will include at least
one, and you can get more at places like Radio Shack.


Each phone? So, If I have one phone in the kitchen, one in the livign
room, and the other dial-up phone jack without a phone, and hook DSL up to
the dial-up jack without a phone, then I will have to put filters on both
the two phones?