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Re: Official Message From Comcast-- a question.
From: David Farber <dave () farber net>
Date: Mon, 15 Sep 2008 17:52:43 -0400

Begin forwarded message:

From: Dan Ritter <dsr () tao merseine nu>
Date: September 15, 2008 2:23:35 PM EDT
To: David Farber <dave () farber net>
Subject: Re: [IP] Re:    Official Message From Comcast-- a question.

For IP:

As of 2006, the average US home had 2.6 television sets. If
anything, the 650 GB of television is an underestimate,
especially in houses where there are multiple kids watching TV.


suggests 5 hours/day per adult, rather than 8, but also
more than 3.5 hours per child. In a mythical 2 adult, 2 child
family, all watching different shows, that's a bit over twice
David Reed's estimate, about 1.4 TB per month.

All this screams out for Switched Digital Video (over IP or over
QAM), in which the provider makes multicast streams available
for viewing. If no one in a cable neighborhood is watching one
of the 400 channels that no one watches, no bandwidth is


On Mon, Sep 15, 2008 at 12:58:06PM -0400, David Farber wrote:

Begin forwarded message:

From: "David P. Reed" <dpreed () reed com>
Date: September 15, 2008 11:42:53 AM EDT
To: dave () farber net, Bruce Kushnick <bruce () newnetworks com>
Subject: Re: [IP] Re:      Official Message From Comcast-- a question.

It uses no upstream bandwidth at all.

It uses about 6 mb/s * 86400 s/day * 1/3 * 30 days/per month / 8 b/B =
0.65 * 10^12 Bytes/month down.  That is shared among some percentage
of the 500 homes passed by your cable segment (assuming everyone is
watching something differently, it is shared by 1).

So month's usage is equivalent of 650 GB of data down, 0.0 GB up is a
worst case model for your "typical" digital TV customer, if they never
watch what their neighbors watch, and get really high quality (6mb/s)

David Farber wrote:

Begin forwarded message:

*From: *"Bruce Kushnick" <bruce () newnetworks com
<mailto:bruce () newnetworks com >>
*Date: *September 15, 2008 8:46:49 AM EDT
*To: *<dave () farber net <mailto:dave () farber net>>
*Subject: **RE: [IP] Re:   Official Message From Comcast-- a
question. *

A question --- How much does a regular cable service take up in
bandwidth ? yes, I know all of the caveats, but if I watch, say
Comcast for the usual 8 hours a day, at the current broadcast
bandwidth, how much does that use up?
Bob mentioned:
10 Maverick games once Mark Cuban provides multiple points of view
in real time with real time compression.

Bruce Kushnick,.

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