• From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
  • To: "OpenDTV (E-mail)" <opendtv@xxxxxxxxxxxxx>
  • Date: Mon, 13 Dec 2004 13:34:44 -0500

Craig Birkmaier wrote:

> The whole point of this exercise, versus the current
> approach that delivers every channel to every
> neighborhood using MPEG-2 transport, is that you do
> not need to waste bandwidth for channels that are not
> being viewed in any particular neighborhood. The net
> result is that you free up bandwidth for more VOD
> streams and IP data delivery to that neighborhood.

You're getting a little closer to the issue, Craig, but
you haven't quite seen the tradeoff yet.

The tradeoff you have to make is between offering a huge
amount of bandwidth very cheaply, with a broadcast
protocol, vs installing a routed IP network. Yes, all
the way to the home, this tradeoff holds.

My suspicion is that the true payoff is not to viewers,
but rather to the service provider. The true benefit
will be revenue gathering and spamming mechanisms.

Remember all the hype about Passive Optical Networks
(PONs)? The whole idea of the PON is to delete active
electronics from the neighborhood plants. So *even if*
you deploy IP multicast, you won't see the benefits of
IP multicast if you remove routers from neighborhoods.
There's the tradeoff.

It would be interesting to see what happens to all that
"community programming" stuff, once the stats come in
that no one is ever watching these shows. Then you need
to ask yourself why not just use the bandwidth
allocated to those shows for your NVOD, which is in
effect what IP multicast is doing automatically, at a

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