It depends on your DSL modem for part of your question. For the most part, you connect your DSL with a standard phoneline cable that goes from the jack to the DSL Modem. If you get one with a built in ethernet connections, you connect the cat5/RJ-45 connecter into that. My phone company offers a Wireless DSL modem and if I were a tech setting up your house, I'd set the Wireless DSL Modem upstairs and connect all three of the upstairs computers to that and then the 1 downstairs connection would be the Wireless.
As for what you'd do with other phones, in our kits, we give our customers a phone line splitter that you'll plug your phoneline from the jack to the DSL Modem then the other side, you put a filter that goes to your phone. On the rest of your phones, you're supposed to put a filter because if you don't you'll be getting a staticy-wavish sounding noise when you're DSL modem connects to the Telco's equipment.
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