[js1138]

Since there aren't really different grades and qualities of "digital"

DSS broadcasts all shows in digital, but some in HDTV. This requires two channels, but the composit content delivered to the display really is different. In theory it could be one signal.

[Wyatt's Torch]

Yeah, DSS is heavily compressed. The main issue is that the native content, to be truly considered hi-def has to be shot: 1) in 16X9 format and 2) has to be 480P, 720P or 1080i. Standard digital DSS signals are none of these. The hi-def signals, from a different sattelite, are native hi-def signals. You are correct about digital but to be hi-definition it has to conform to those standards.