Cox has deployed Switched Digital Video (SDV) in Virginia in the hope of releasing more bandwidth to deliver more HD channels.  SDV works by only "turning on" watched channels.  Currently Cox delivers all their channels all the time wether or not anyone is watching.  This takes up bandwidth and is wasteful as even if no one is watching Lifetime network the channel is still being broadcast.  With SDV the channel is only broadcast when someone tunes into that channel.  With the amount of bandwidth that will be saved on a regular basis from unwatched channels Cox will be able to deliver more HD channels.  Since Cox test/delploying this technology in Virginia we should hopefully be enjoying it soon as well here in New Olreans as we are the 3rd or 4th city to get the latest in Cox Communications digital technology (That is one "good" thing Katrina gave us).