[opendtv] Re: Here’s Comcast’s Version of Apple TV
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: "opendtv@xxxxxxxxxxxxx" <opendtv@xxxxxxxxxxxxx>
- Date: Fri, 28 Jun 2013 20:37:30 +0000
Craig Birkmaier wrote:
>> How many households of, say, 1.5 Mb/s capacity can you serve with
>> a single 6 MHz TV channel, Craig?
>
> Wrong question at several levels.
>
> First, if you are delivering live programming it is no different than
> broadcasting today - just join the desired multicast.
Wrong discussion entirely. What I said was, the DBS companies can *reinvent*
themselves, as the cable companies have done and are doing, to go from being TV
content broadcasters to a new role as two-way IP service providers for the
boonies. That's the main change.
That occasionally they might also want to multicast content, in those special
cases where live really matters, is beside the point. It is merely a side show.
And as we have discussed many, many times over, two-way schemes such as LTE are
way **LESS** spectrally efficient than one-way broadcast streams, in this
broadcast or multicast role. Remember those numbers, Craig?
It takes very, very close spacing of LTE towers to even come close to the
spectral efficiency of ATSC or DVB-T2. So, it's not a simple repurposing of
existing broadcast towers. It's a total redesign of the system, *even if* you
might adopt the TV frequency bands for it.
> Second, why 6 MHz channels? We can achieve much higher levels of
> spectral efficiency with wider channels.
These are minutiae. The point remains the same. I asked you a simple question
to try to force you to do the numbers, for a change.
Bert
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