Re: [Astlinux-devel] Comcast/Xfinity DOCSIS 3.1

[David K. <da...@ke...>]

Thanks Lonnie.  I think I will wait-and-see.  The modems are quite
expensive right now.  I am on Xfinity Blast tier which is supposed to be
250Mbps down / 10Mbps up and my speedtest shows I get ~210 down and ~12
up.  I suspect that the 210 down is probably close to practical limit on my
modem, although it is supposed to go faster that is probably in perfect
lab-bench conditions and not real world.  So it is possible a DOCSIS 3.1
modem might do me some good.

On Sun, Aug 5, 2018 at 9:01 AM, Lonnie Abelbeck <li...@lo...>
wrote:

> Doing some research and reaching out to "dslreports" forums, it does
> appear that a DOCSIS 3.1 modem (with 3.1 infrastructure) does offer more
> robust IP transport ... somewhat less latency and jitter.  DOCSIS 3.1 uses
> a better error correction method, Low Density Parity Check (LDPC), which is
> implemented in DOCSIS 3.1 modem hardware.
>
> The question is whether it is worth upgrading now, or wait for your ISP to
> give you an incentive to upgrade to a DOCSIS 3.1 modem.
>
> I'll probably look at getting a DOCSIS 3.1 modem shortly after 3.1 is
> available in my area, keeping the same download speed plan.
>
> Lonnie
>
>
>
> > On Aug 4, 2018, at 10:04 AM, David Kerr <Da...@Ke...> wrote:
> >
> > That is exactly the question I am asking myself.  Is it worth it.  I can
> understand why the ISP would want me to upgrade (spread customer load
> across many more channels) but it is not at all clear why I would want to
> upgrade.  I agree latency and jitter is more important than raw bandwidth,
> I have plenty of that (download at least).
> >
> > David.
> >
> > On Sat, Aug 4, 2018 at 10:56 AM, Lonnie Abelbeck <
> li...@lo...> wrote:
> >
> > > On Aug 4, 2018, at 9:08 AM, David Kerr <Da...@Ke...> wrote:
> > >
> > > Comcast/Xfinity have been bugging me to upgrade my cable modem for the
> past few months.  Started with emails, now getting telephone calls, stating
> that my current modem cannot take advantage of their latest technology
> upgrades.  I'm assuming they have rolled out DOCSIS 3.1 into my area.  I'm
> not sure I am going to do it yet but looking at the options there are
> basically three to chose from, Netgear, Arris and Motorola.
> > >
> > > Ok, so the point of this post... the Motorola claims to support up to
> 2Gbps download by channel bonding two 1Gbps ethernet ports.  Of course
> Comcast doesn't have anything like that speed support but it does prompt
> the question as to whether Astlinux could channel bond two ports into
> EXTIF.  And of course it would need to also bond two ports for INTIF that
> would need to connect to a switch that supported bonding.
> > >
> > > Clearly not something needed anytime soon, but I am curious.
> > >
> > > Thoughts?
> > > David
> >
> > My ISP (COX) will be turning on DOCSIS 3.1 any day now in my area, I'm
> not interested in DOCSIS 3.1's 1 Gbps down (only 30-ish Mbps up).
> Currently I have a 50/10 Mbps business connection and other than running
> speed tests I can't think of a time I noticed where the complete data path
> was limited by 50 Mbps.  Over time this will slowly change and then 100
> Mbps may be useful.
> >
> > Personally, the quality of the connection ... low latency, low jitter,
> low downtime is far more important to me than down speed greater then 100
> Mbps.
> >
> > So, how does a DOCSIS 3.1 modem perform (latency and jitter) on DOCSIS
> 3.1 infrastructure compare to a 3.0 modem on the same 3.1 infrastructure ?
> I have yet to find an answer to that question.
> >
> > Also beware that some DOCSIS 3.1 modems use an Intel Puma 6 chipset with
> a lot of problems.
> >
> > Also beware COX residential (and Comcast I think) currently have a
> default 1 TB data tier, so at 1 Gbps 1 TB of traffic occurs in 133 minutes.
> >
> > So David, I don't think ethernet bonding is worth worrying about. :-)
> 10 Gbps NIC's will probably be ubiquitous when we need such a thing.
> >
> > But, since a DOCSIS 3.1 modem will aggregate a lot more channels than a
> DOCSIS 3.0 modem (on 3.1 infrastructure) would a DOCSIS 3.1 modem be a
> useful upgrade for a plan speed of 50-300 Mbps ?
> >
> > Lonnie
>
>
>
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