Originally Posted by sgbroimp
I always ask if it is Comcast since I am trying to compare apples to apples and i am stuck with them for my town.
I did talk to a Comcast line guy I saw coincidently in Madison this morning. He said I should call the tech in anyway and if they can't improve the line person could come. He seemed to think an 11 bitrate was not right.
But here is my question. Other than compression that is done by some human at the controls, can anything else cause a low bit rate on some stations? Malfunctioning amp, line ingress, weak signal (no, right?) or someting else? Second, does the tech that comes to the house first have a device that reads bit rates or only db of signal? How about the line tech?
As I have said before, the bitrate is determined by the encoding way far up the stream. It's not right, but it's a decision made by Comcast on a market or national basis, and it has nothing to do with Clinton's system or Branford's (Madison's) system, or your installation.
The encoders are set up by humans, the number of channels for a given amount of bandwidth is set up by humans, and they *might* have some sort of "bias" to give one channel a percentage advantage over the others sharing a QAM, but that's my speculation. Beyond setting something like a bias, or tweaking parameters, once they're going they just keep doing whatever they were programmed to.
If your local system is functioning properly, you will get the signal. If it is not, you will not get the signal. It is completely impossible for your local system to affect the compression on a signal unless it was re-compressing it, which, other than local access, they are not. This is digital. You can't lose part of the signal and somehow still have it display.
No tech would read a bitrate of a signal. It's irrelevant. The network engineers that compress the signal for the market or nationally would be watching bitrates, but they would be monitoring them at the point of compression (or remotely from that location) and that has exactly diddly squat to do with your local system. In fact, that bitrate is the same even after it's traveled through MoCA or ethernet, like with a TiVo whole-home DVR system with TiVo Minis, or through Media Center with XBOXes or other extenders.
The over-compression is a market and national policy of how Comcast manages their systems. It has nothing to do with Clinton, CT, and nothing to do with Groton, CT. The only differences you will see are on the Branford system, some of the channels that are not on the lower frequency systems like ESPNU HD look amazing, but that's because the 860mhz systems have a ton of room after they have most of the national channels smushed into the equivalent of a 650mhz, so they let the bitrates go way up on some of those channels. But again, that's a national decision, as it would affect any 750mhz or 860mhz system the same way.
EDIT: ESPNU HD, not ESPNU