"Montblack" wrote in message
.. .
High speed DSL uses the second (home phone) wire for the computer
downloads
and uploads, leaving the first (home phone) wire available for the actual
phone. This is why DSL customers can talk on the phone *and* be on the
internet - at the same time.

DSL runs on the same single phone line pair as voice. It uses frequencies
higher than those used for voice. It does not require a separate pair,
although sometimes it is set up this way for various reasons.