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andyross
Premium,MVM
join:2003-05-04
Schaumburg, IL
reply to telcodad

Re: [Speed] Heads-Up: Time to Replace Your DOCSIS 1.1 Modem

said by telcodad:

said by JigglyWiggly:

so no more TDMA I am ass uming is the reason for this?

I guess you're talking about Comcast possibly moving to the use of S-CDMA on the upstream, as talked about in this recent Light Reading Cable article: »www.lightreading.com/document.as···lr_cable

Wouldn't getting rid of D1.x modems also allow them to eliminate 16QAM upstreams? I thought that 32 & 64QAM were new with D2. That can help upstream bandwidth a bit.


telcodad
Premium
join:2011-09-16
Lincroft, NJ
kudos:15

Yes, the 16-QAM upstream carriers are currently needed to support any remaining DOCSIS 1.X devices on the network.

However, unless a move to S-CDMA is eventually made, I think it could be possible that some 16-QAMs might still be placed in the noisy, sub-20MHz region, where their lower SNR requirements (vs. 64-QAMs) come in handy, in order to provide a bit more (bonded) uplink speed.