reply to motorola870
Re: AT some point... Comcast went all 860, triple-channeled the HD, and dumped analog, but they don't use SDV. I'd rather have non-re-compressed HD on a 1ghz system with SDV, but I guess we can't have everything...
1ghz doesn't help too much on the video side, as only some VOD can go up past 860, due to some cable boxes and third party tuners not going past 860, but if you move 8 DOCSIS channels up there, and only leave one south of 860 (for D2), it would help quite a bit. If you split the nodes to the point where there are less than ~100 home on each one, you could make everything except Clear QAM and expanded basic in SD (for DTAs) SDV, which could save a lot of bandwidth.
You also save on congestion on the VOD and DOCSIS sides of things, and can do more HD on demand. Basically, the farther you push the nodes out, the more and more it becomes equivalent to FTTH without actually having to install the fiber in everyone's houses. Or even if you have multiple nodes co-located together with the coax going off in different directions...