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Re: Netflix Is Eating Up More Of North America's Bandwidth Than Any Other Company


From: Lou Katz <lou () metron com>
Date: Tue, 24 May 2011 19:48:07 -0700

On Tue, May 24, 2011 at 08:12:31PM -0400, Max wrote:
Was PBS one of the companies you are referring to?  A colleague of
mine worked as a developer on a project at PBS in the 90s that used
the blanking interval for Internet transmissio - very cool stuff.

<snip>

The one that was _much_ more interesting was the one that Lauren Weinstein
had a hand in.  It piggy-backed a Usenet feed in the vertical blanking
interval of several big "independant" TV stations -- ones that were
carried by practically every cable company in the country.  Distribution
to the cable companies was via satellite, but the USENET feed, being
_part_ of the video signal, consumed _zero_ additional bandwidth, and
rode the satellite links for free.

To get the feed, all you needed was a TV tuner with 'video out', and the
purpose-huilt decoder box that extracted the vertical interval data.

This service died as the independants moved to encrypted transmission,
because the encryption did _not_ perserve anything in the 'blanking'
timeslot. only the 'viewable' field-image was trasmitted, _as_ a full-field
image.  Sync, blanking, etc. was _locally_ generated on the receiving end.

An "elegant" idea, done in by changing technology.   *sigh*


As USENIX director I sponsored and sheparded this project, called "Stargate".
We at least got bits into the blanking interval at WTBS in Altanta.

-- 

-=[L]=-
Hand typed on my Remington portable

Real data are normal in the middle and Cauchy in the tails.


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