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Originally Posted by ianathuth
I was using the fact that many UBRs (using DOCSIS and QAM64) have a downstream limit of around 27 Mbps which becomes nearer 20 Mbps after overheads and an upstream limit of around 2 Mbps.
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There are v few cable modems that can go anywhere near 20Mbps downstream, and most won't go near 2Mbps upstream either, certainly not for any length of time, simply because there is no need for them to.
You appear unaware that the upstream limit can be much higher while using the same modulation - doubling upstream channel width to 3.2MHz results in a doubling of usable bandwidth and is deployed in the field at the moment.