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The standard upstream spectrum is 5MHz to 65MHz using QPSK modulation in 3.2MHz channels
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It is for EuroDOCSIS areas, DOCSIS has different (i.e. lower limits). Most of both networks is now 3.2Mhz, which is what's made the big difference in the last year on upstream congestion.
There's a similar difference in the standard downstream, which is 6Mhz in DOCSIS areas rather than 8Mhz.