DSL has nothing to do with sat cards. The sat cards plug into your computer's pci card bus. Just like a video card. Or, if you get a USB version, it plugs into an available USB port ( 2.0 best for speed). The card is a satellite receiver in itself.
It uses your computer to decode the Video & audio. For HD, you need a fast computer and video card. Depending on your setup, you can either watch the tv signal on your computer or, if your video card supports it, output the video to your TV. Read some of the info in the threads in this forum and you should find more info explaining what using a PCI Satellite card is and how to set one up.
They are a lot of fun. ( in my opinion)
grusome