
Switched Digital Video is basically a new method for delivering digital video channels to your home. Because you're probably only watching one channel at a time (or recording one or two channels while watching another), there's no real reason for a cable operator to transmit all 300 channels to your house at the same time. But since there was previously no way for cable companies to know which channel you wanted to watch at any given time, they simply transmitted all the channels at the same time.
Switched video enables two-way communication. If you want to watch C-SPAN, your box will send a signal upstream telling the cable operator to start sending the channel your way. The upshot is that cable companies can offer more channels using the same bandwidth.
You should be able to pick up a shiny new switched digital video adapter for your TiVo HD or Series3 TiVo from your cable company during the second quarter of 2008.












