Cable Company Network Upgrade

Frank Bulk frnkblk at iname.com
Sat Jul 19 23:04:24 UTC 2014


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
>
> Email: chris.thompson at solutioninc.com
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