[opendtv] Re: Spectrum is too valuable

  • From: Albert Manfredi <albert.e.manfredi@xxxxxxxxxxx>
  • To: "opendtv@xxxxxxxxxxxxx" <opendtv@xxxxxxxxxxxxx>
  • Date: Sat, 7 Nov 2015 19:30:20 -0500

Craig wrote:

The reality is that these cabled systems have enough spectrum to offer
multiple
services, and they do not need to rush to build out more PONs until the
demand
increases enough to justify the expense.

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

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.

This statement was a rhetorical set-up Bert. Just a point of reference that I
knew you would jump on.

I would avoid rhetorical flourish that you then quickly contradict. That
flourish was simply wrong.

the best we can do today with DOCSIS 3.0 is 6.33 X 900,000,000
= 5.697 Gbps

Yes, I just finished telling you that yesterday, Craig.

Sorry Bert, you did no such thing.

Sorry, Craig, but you need to read and you need to retain what you read. This
was my first post on Thursday:

"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."

Still, doing the numbers yourself seems to help retention. So I encourage it.

Bert

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