Quote:
Originally Posted by Chrysalis
What I say is subject to been wrong.
But generally interpret ATDMA as been docsis2, if there is a noise issue it will drop back to QPSK, on the superhub that will appear as ATDMA 10240kbit/sec. Still be the equivelent to QAM16 on docsis1 in terms of capacity. If no noise issue you should be seeing ATDMA 20480kbit/sec.
Docsis1 would show as TDMA 10240kb/src if no noise issue or TDMA 5120kbit/sec if a noise issue, the latter been QPSK on docsis1.
I have never heard of someone been rolled back to docsis1 due to noise it would just go to QPSK but stay on docsis2.
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Correct. The secondary / fallback profile is still a 6.4MHz wide DOCSIS 2 channel, just the modulation changes.
They could actually have 3 profiles, 64QAM, 16QAM and QPSK for example, perhaps one to think about once plant upgrades are done.