[opendtv] Re: Spectrum is too valuable

  • From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
  • To: "opendtv@xxxxxxxxxxxxx" <opendtv@xxxxxxxxxxxxx>
  • Date: Thu, 12 Nov 2015 01:26:25 +0000

Craig Birkmaier wrote:

Despite the fact you changed the subject I indulged you. I made the
numbers generic...

No, Craig. I explained how a relatively small amount of broadband spectrum, per
household, could carry multiple HD streams, and your response was that HD
requires 19 Mb/s. You can't weasel out of that one.

Looks like *exactly* what I said. HD at 5 Mb/s.

And once again you blow right by the facts, citing the minimal numbers
rather than the HQ - that stands for High Quality Bert.

And once again, Craig can't read.

When you attempt to drown out arguments with an excess volume of words and
numbers, so you don't even absorb what they say, you invariably miss what
matters. This is what your table states:

http://www.lighterra.com/papers/videoencodingh264/

720p 1280x720 4.0 2.56 2496 64
720p HQ 1280x720 5.0 3.20 3072 128

The third column is link Mb/s. The fourth column is the actual bit rate
required for the stream.

So, this is **precisely** what I already informed you about, Craig. With
Internet streaming, you need only 5 Mb/s to a home, for very decent TV service,
unless multiple people want to stream HD simultaneously. You DO NOT need
anywhere close to 25 Mb/s, no matter what the FCC might classify as
"broadband." And note that the ACTUAL bit rate needed is 3.2 Mb/s, so the 5
Mb/s link provides some margin.

The infrastructure can be made to handle TV, Craig, and the needed edge servers
are added/improved as demand dictates. And this is also important. If you read
the DOCSIS 3.1 standard, you will note that the **only** way DOCSIS 3.1 can
manage ~10 Gb/s per PON is by doing assuming these two points:

1. That there are no MPEG-2 TS broadcast streams on that PON. All dedicated to
broadband service, like I said.

2. That the usable spectrum is just about doubled, from ~900 MHz to ~1800 MHz.

http://www.cablelabs.com/wp-content/uploads/specdocs/CM-SP-PHYv3.1-I07-150910.pdf

So, Craig, how many households, at 5 Mb/s, could be fed from a single PON? Or
even at 15 Mb/s? How does that compare with your average of 500 households per
PON today?

Bert



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