[opendtv] Re: Microtune and DOCSIS 3.0

It would be "completely unrelated to HDTV" only if cable companies use a
totally different physical paths to serve docsis and tv content.  Which, of
course, they DON'T do.

It's called capacity constraints.  Funny, bert, in your wide knowledge, you
aren't aware of them.  Maybe too many years servicing the military under
cost plus sole source contracts.

John Willkie

-----Mensaje original-----
De: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] En
nombre de Manfredi, Albert E
Enviado el: Thursday, August 23, 2007 9:40 AM
Para: opendtv@xxxxxxxxxxxxx
Asunto: [opendtv] Microtune and DOCSIS 3.0

Looks like DOCSIS 3.0 allows for cable download speeds to increase to
beyond 160 Mb/s, which it does by bonding up to four separate 6 MHz
cable channels. Wow. Maybe that has a lot to do with the capacity crunch
cable companies are expecting, and that's completely unrelated to HDTV.

http://www.digitaltvdesignline.com/howto/showArticle.jhtml?articleId=201
800641&pgno=4

says that a new Microtune 2170 cable tuner can bond up to four 6 MHz
channels together with a single tuner, and those four channels can be
distributed anywhere in up to 100 MHz of bandwidth. Meaning, the four
channels do not have to be contiguous.

That should be good for about 172 Mb/s dowload speeds, if 256-QAM is
used. But of course, it also means that for download alone, up to four 6
MHz channels would have to be dedicated to just one customer, in the HFC
cable plant. Which makes cable broadband nets look ever more similar to
the telco broadband schemes.

Bert
 

 
 
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