[opendtv] Re: Apple May Rethink Web TV Service, Says Pac Crest - Investors.com
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: "opendtv@xxxxxxxxxxxxx" <opendtv@xxxxxxxxxxxxx>
- Date: Thu, 19 Nov 2015 01:51:40 +0000
Craig Birkmaier wrote:
As I've been saying for many months. There is NO REASON to keep
offering hundreds of rerun channels when almost all library
content will be available on demand.
Let's say you continue to broadcast only 100 6-MHz channels of TV. That's going
to take up the equivalent of 3.8 Gb/s of PON capacity right there (100 * 3.8
Mb/s = 3.8 Gb/s). Let's say that each home wants 1 Gb/s as you say, and your
cable plant is 900 MHz bandwidth.
The single PON can serve only one home, Craig. Do the math. 5 Gb/s max possible
if all capacity is allocated to DOCSIS, minus 3.8 taken up by the broadcast
streams, leaves only 1.2 Gb/s. You have barely over 1 Gb/s of capacity left
over, for the one home. Kind of changes the whole meaning of PON, eh?
Okay, so you expand that cable plant to 1.8 GHz bandwidth. Now you still have
3.8 Gb/s of capacity taken up by the broadcast streams, which leaves a maximum
of 6.2 Gb/s for broadband service. Great! Now you can serve 6 homes from that
PON, each with 1 Gb/s broadband.
It's pretty obvious that if each home wants 1 Gb/s of broadband service, the
number of homes served by any PON will be minuscule. But surely you can see
that wasting spectrum on broadcast only makes matters worse. In the 900 MHz
example, repurposing the broadcast spectrum would allow the cable company to
serve 4 homes instead of one, with 1 Gb/s service. My not be worth it to them?
Perhaps.
Bert
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