AFAIK, that's the only form of HD connection that set supports. (Technically, it's not a "colorstream" connection, since Toshiba reserves that name for its 480i/480p inputs. But it's the same sort of three-wire connection.)
I'm moving this to Audio/Video Sources.
Just to clarify, the reason I am asking this is that my Dad just got a Toshiba 57H81 and his cable provider just began providing HD channels. He called them today to order it and they are bringing the box on Thursday. They didn't say anything to him about having to get his own caables, so should I assume they will provide the component cables?
I would not assume they would provide the cables. I wouldn't even assume the box has component output (as silly as it sounds to have an HD box without), judging by the weird stories I keep hearing about how cable companies operate. Easy enough, I guess, to wait and see. In a pinch until you can buy a component cable, you could use 3 ordinary video (yellow) phono cables.
In order to deliver HD broadcasts in HD, the box has to have component (or RGB or Firewire or DVI) connections. HDTV video coming out of an S-video or composite or channel 3-4 RF jack has been downrezzed to 480i.
Also the scan rate must match. If the HDTV output from the box is 1080i, the "colorstream" input on the TV must have an automatic or manual selection for 1080i.
Video hints: http://members.aol.com/ajaynejr/video.htm