[opendtv] Re: Spectrum is too valuable

  • From: Craig Birkmaier <brewmastercraig@xxxxxxxxxx>
  • To: opendtv@xxxxxxxxxxxxx
  • Date: Sun, 08 Nov 2015 08:07:13 -0500

On Nov 7, 2015, at 7:30 PM, Albert Manfredi <albert.e.manfredi@xxxxxxxxxxx>
wrote:


The reality is that Craig has no idea whether this is true, and the numbers
contradicts what he thinks.

It is true because the cable industry is doing this today. The numbers support
what I am saying.

I think you are under estimating the bandwidth needed per home; three HD
streams in 19 Mbps is clearly insufficient for MPEG-2, and on the low end
for
h.264,

This is far from the truth, demonstrably, for MPEG-2 compression and
certainly for H.264. There are several channels which transmit at the same
time one HD and three, four, even five SD streams, MPEG-2 compression, in 6
MHz.

You claimed three HD streams in 18 Mbps. Even HD movies require more than that
with MPEG-2. Our CBS feed still exhibits major compression artifacts during
football games, and that stream is at least 10 Mbps.

You can pre filter and compress the hell out of anything, but that completely
misses the point. The goal is to deliver high quality artifact free video at
whatever resolution the available bandwidth can support.

"I'm saying, if you have a local PON, as would be typical today, they
dedicate, say, 150 6-MHz channels to broadcast MPEG-TS linear streams.
Including a lot of duplication with SD and HD streams, not to mention any
remaining analog. So this approach takes up roughly 5.7 Gb/s of potential
capacity that could have gone to improving the downstream broadband service."

You modified this response versus what you originally wrote: see my response to
John. But even with this modification you can only serve about 300 homes at 19
Mbps. That's nowhere near what you need for a PON with 500 customers, and well
short of what the FCC now considers to be the minimum nitrate for broadband.

Regards
Craig


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