The 100 Gbit/s problem in your network

Tue Feb 12 19:54:45 UTC 2013

> I really wish I could agree! It would have saved me some time dealing with
> it.
>
> There is the argument of alternative bit rates, compression, etc., but HD
> streams are assumed[1] at 15 Mbps.
>
> At 100Gbps, I can do max 6826 streams of HD streaming. Multicast
> deployments laugh at this pathetically low number of viewers.
>
> At an upstream aggregation point, I can easily serve ~128K subs (7 slots, 8
> ports per slot, 3 ports per $ACCESS, 8K[3] users per $ACCESS, 1 slot for
> upstream). I now assume 2.5 STBs per sub[2]. This results in, more or less,
> 320,000 STBs.
>

Multicast for inside of a given service provider is certainly not dead and
in fact its widely deployed for IPTV in DSL/FTTx networks.  FIOS doesn't
use it since they're not doing IPTV (traditional RFoG) but Uverse does as
do most telco TV providers I've spoken with.

>
> To me, the math says its not dead and we'll need a couple of orders of
> magnitude (to accommodate the core) in speed improvements to get the same
> delivery unicast.
>
> [1] http://www.cablelabs.com/specifications/OC-SP-CEP3.0-I04-121210.pdfLists
> 15Mbps as safe harbor value for HD
> [2]
> http://www.aceee.org/files/proceedings/2012/data/papers/0193-000294.pdfHas
> some stat (good or bad) wrt STBs/household
> [3] uBR10K (my $ACCESS comparison) specs out for max 64K CPE. One of my
> guys indicates to me that the actual number might be closer to 15-25K CPE
> on a given node. Please make adjustments as necessary.
>
> (required note: employer is Cisco. Views are my own.)
>
> --
> William McCall
>

-- 
Scott Helms
Vice President of Technology
ZCorum
(678) 507-5000
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