Cable Forum - View Single Post

Chrysalis · 07-05-2011, 19:18

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.

07-05-2011, 19:18	#11
Chrysalis cf.mega poster Join Date: Sep 2003 Posts: 12,048	Re: Qam16/qpsk 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.