[c-nsp] UBR Questions

[James Galliford]

Who knows... DOCSIS 3.0 may be out before 2.0 can even reach prevalent.

On Thu, 18 Nov 2004 14:10:09 -0500, Paul Stewart <pauls at nexicom.net> wrote:
> >Hrm, I have to agree with Michel on this one.  Upgrading to 16-QAM is a
> great idea in theory but in reality can be quite scary with respect to
> managing your cable plant properly.
> 
> Yeah, I've heard this before..:)
> 
> >Also, I'm not sure if the built-in RF card in the 7114 can do DOCSIS
> 2.0.  As far as I know they cannot do A-TDMA or S-CDMA.
> 
> Nope.. Unfortunately not but we're some time before going to 2.0 which
> is good and bad (depending on how you look at it)..;)
> 
> Thanks,
> 
> Paul
> 
> 
> 
> 
> On Wed, 17 Nov 2004 08:12:03 +0100, Michel Renfer <michel.renfer at lan.ch>
> wrote:
> > Hi all
> >
> > > Is there any specific RF plant related reason that you have your
> > > upstream channel-width set at 1.6MHZ wide? (this is why you
> >
> > If you change from 1.6 MHz to 3.2 MHz channel width, you will need ~3
> > dB more SNR. Check also the transmit power on the cable modem side,
> > that they are not to close to the maximum power level (~58 dBmV).
> >
> > If your cable plant is in a good condition, you can also think about
> > the adjustment of the upstream modulation to 16qam.
> >
> > cheers,
> > michel
> >
> >
> >
> >
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> >
> 
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> not sure about the former."
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-- 
"Only two things are infinite, the universe and human stupidity, and
I'm not sure about the former."
    - Albert Einstein