[opendtv] Re: News: The Internet revolution is about to be televised
- From: Craig Birkmaier <craig@xxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Tue, 1 Mar 2005 11:26:05 -0500
At 5:24 PM -0500 2/28/05, Gary Hughes wrote:
> >Yes. Switched broadcast is the term that gets thrown about. There
>are variations on the theme, but in essence for the less popular
>channels you only send the continuous feed to a given edge device
>if someone attached to that edge device requests it. The 20% or
>so popular channels are distributed as they are now and the remaining
>80% go switched, allowing their channels to be reclaimed and made
>available for on demand applications.
Exactly. This is an interim step based on the economics of
subdividing the cable network into smaller loops. It is also being
driven by the proliferation of channels on digital systems. It allows
the cable company to deliver more programs to the same number of
subscribers on a large loop, rather than moving to smaller loops with
all of the associated costs in lighting up more fiber trunks.
The routing overhead is considerable lower with this approach as
opposed to routing unique bits to each home. The technology has
already been proven with DBS, which maps channels to transponders
dynamically, and let's the set-top keep track of where to find each
service.
Regards
Craig
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