Quote:
Originally Posted by qasdfdsaq
Given each downstream channel requires a certain amount of upstream bandwidth to work, it does.
Considering one downstream channel uses up to 5-10% of the upstream channel capacity to run, fully utilizing 8 downstream channels with one upstream could result in up to 80% of the upstream capacity being utilized just to operate the downstream, while nobody is uploading anything. That leaves very little upstream capacity left over for actual uploading, especially given congestion issues can begin at above 70% upstream utilization
---------- Post added at 03:12 ---------- Previous post was at 03:10 ----------
However if the network only had one downstream (aside from downstream congestion issues) that would leave at least 90% of the upstream capacity available, compared to the ~40-50% left over with 8 downstream channels in use.
|
Believe it or not, this situation is nothing new to VM. Remember when the 50Meg first came out and had an upload speed of barely over 1.5Mbit? (If I recall correctly). The ACKs alone would nearly congest the upload stream in itself, yet it actually ran fairly smoothly (For most, there's always an exception). Anyway, there is a point in what you're saying but he's having this issue without actually utilising his downstream, which is the point I'm making - just HAVING 8 downstreams versus 1 upstream isn't the issue, there's obviously something else going on there.
I'd like to know where you're getting your figures, though, 5-10% of upstream per downstream for example. Are you referring to the available bandwidth for the connection (What profile the modem is set to), or the available bandwidth for the channels (8x50Mbit on the downstream, 1x~30Mbit on the upstream?) or what?