Cable Company Network Upgrade

Sun Jul 20 19:30:38 UTC 2014

Instead of over subscription ratios think about what each user is doing.

Let's say one 1080p Netflix stream per customer,  that's 6 mbps each.
Perhaps provision for that and you'll have plenty.
On 20/07/2014 11:06 AM, "Frank Bulk" <frnkblk at iname.com> wrote:

> Thanks for sharing Ben, that's 450 kbps/sub at peak times!  We see numbers
> in our network closer to 300 kbps per subscriber.
>
> Assuming peak usage levels of 450 kbs/sub, that would be 15.75 Gbps for
> Toney's customer base, and possibly more if they really have a 240 Mbps
> offerings.  But if there are 20 locations then it's an average of 787.5
> Mbps per location.  If each site had a 10 Gbps interface (with 1 or 2 Gbps
> of transport), then the core location should peer/buy transit with at least
> two ISPs over four 10G interfaces.  That way if one ISP/interface falls
> away there's still sufficient capacity.
>
> We weren't told the geographical disparity of these 20 locations, but it
> may be wiser for each location to peer/buy transit to two or more disparate
> POPs rather than home them to one core location which has more single
> points of failure.
>
> Frank
>
> -----Original Message-----
> From: NANOG [mailto:nanog-bounces at nanog.org] On Behalf Of Ben Hatton
> Sent: Friday, July 18, 2014 7:51 PM
> To: nanog at nanog.org
> Subject: Re: Cable Company Network Upgrade
>
> I don't think there are any 'budget' routers that would move the amount of
> data you are looking at trying to do.
>
> 35k subs @ 240Mb is 8.4Tb/s at 100% utilization, even at a somewhat high
> 100:1 oversubsctiption you are looking at over 80Gb/s
>
> While our DOCSIS network is only 4000 subs, we peak at around 1.8gb/s on
> 10Mb packages, while oversubscription can increase with higher speed
> packages, as many users would never use that much bandwidth, some will, and
> even 1% of your customer base capping out a 240Mb would take most of a 10Gb
> pipe, and you still would have 34000 other subs to handle.
>
> I can't see offering 240Mb service to over 35k subs on anything less than a
> 100g core, and even that would be pushing it.
>
> Ben Hatton
> Network Engineer
> Haefele TV
>
>
>
> On Fri, Jul 18, 2014 at 2:33 PM, Chris R. Thompson <
> chris.thompson at solutioninc.com> wrote:
>
> > I think you oversubscribed... 10,000 to 1 seems a bit steep.
> >
> >
> >
> >
> >
> > On 07/18/2014 06:42 AM, Toney Mareo wrote:
> >
> >
> >
> >
> >         Hello,
> >
> >
> >         I working on a plan about improving/upgrading a Euro-DOCSIS3
> based
> > cable network with the following requirements (very briefly):
> >
> >
> >         -20 CMTS-es on different locations needs to be connected to the
> > network
> >         All of these locations currently connecting to the internet
> > through 1Gbit/s link through a single internet provider, I have to
> upgrade
> > them to be able to connect to at least 2 but ideally 3 ISPs at the same
> > time and use their links for failover (do bgp peering as well).
> >
> >         What type of *budget* routers would you recommend to use for this
> > purpose if cisco is not an option (the company doesn't want to buy cisco
> > equipment)? If you can please give me exact model numbers.
> >
> >         The company has over 35K customers at the moment which use
> various
> > cable modems on different areas (docsis1-3). In the future this network
> has
> > to be able to provide, max 240Mb download/30 Mb upload speed per
> customer.
> >
> >         I also have to give them a proposal about what type of docsis3
> > cable modems should they buy in the future.
> >         And in addition they need some ABR video streaming solution.
> >
> >         I know it's a very brief statement and I left out a lot details,
> > so any hw suggestions are more than welcome.
> >
> >         Have a nice day folks!
> >
> >
> >
> >
> > --
> >
> >
> > Christopher Thompson | Client Care | SolutionInc Limited
> > Office: +1.902.420-0077 | Fax: +1.902.420.0233
> >
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