[opendtv] Re: Here’s Comcast’s Version of Apple TV

  • From: Craig Birkmaier <craig@xxxxxxxxx>
  • To: opendtv@xxxxxxxxxxxxx
  • Date: Sat, 29 Jun 2013 07:18:27 -0400

On Jun 28, 2013, at 9:36 PM, "Manfredi, Albert E" 
<albert.e.manfredi@xxxxxxxxxx> wrote:
> Trying again. My last was confusing two topics.
> 
> If you use a tall TV tower for two-way Internet service in the boonies, this 
> could help for a few households. As a two-way service, anything that is IP 
> multicast, for those rare occasions, would indeed seem similar to broadcast. 
> Except for the fact that if no one is listening (i.e. no one within reach of 
> that tower "joined" the multicast group), then the content would not be 
> transmitted OTA at all.
> 
> The main point being, the number of households served by a 6 MHz channel is 
> going to be rather limited, for two-way service at say 1.5 Mb/s per household.

Yup.

> 
>> Second, why 6 MHz channels? We can achieve much higher levels of spectral
>> efficiency with wider channels.
> 
> Yes, but that's a small effect.
> 
> Satellites can aim their beams, for two-way service. To do that with OTA 
> would require a different system. Not just using TV broadcast transmitters 
> for the downlink of two-way service.

Yes, even in rural areas you would need a cellular approach to deliver a 
meaningful 2-way data service. The main difference from urban areas would be 
the density of the mesh, and the height of towers in low density areas.

> At least we agree that in congested areas, you would go to a cellular scheme.
Agreed.

Regards
Craig

 
 
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