[opendtv] Re: Execs see challenges bringing Net video to TV
- From: "John Willkie" <johnwillkie@xxxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Sat, 27 Sep 2008 15:32:22 -0700
This thread started out dumb, and is getting dumber.
Let me see. Who has 2.5 MB per second (even in bursts) to their home except
for FIOS customers? Without that, you can only watch pre-filtered,
pre-compressed, dumbed-down HDTV content, or stuff like the NewsHour. (not
much bw needed for talking heads).
Bert makes all sorts of outlandish assumptions in his second sentence, but
-- not unusual -- he acts like they are givens.
I frankly don't see how an ISP can support a single customer this way --
absent fiber -- let alone 100 or their entire customer base.
Kind of funny that he apparently doesn't understand about anything about
IpV6, like the built-in multicast features.
And, of course the VOD servers still begs the questions of where they are
going to be located.
John Willkie
-----Mensaje original-----
De: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] En
nombre de Albert Manfredi
Enviado el: Saturday, September 27, 2008 2:34 PM
Para: opendtv@xxxxxxxxxxxxx
Asunto: [opendtv] Re: Execs see challenges bringing Net video to TV
John Shutt wrote:
> How many "full resolution HD" streams does your data
> center host? What are the bitrates, and how many
> simultaneous unicast streams of these full HD programs
> can your data center support?
Let's do some hypothetical numbers. So, the congloms are interested in
making their online content available not just to PCs, for the occasional
catch-up viewing, but to real TVs, in the den. This means that the ISP has a
whole new problem on his hands, where now potentially every household in the
metropolis will be tuning in to an HD stream at the same time. A game
changer for the ISP.
IP multicast is rarely enabled between ISP domains (certainly with IPv4, TBD
still with IPv6). But within his own network, an ISP can certainly use
multicast.
So, an ISP interested in supporting this potentially massive viewership
among his own subscribers, once he sees his network become hopelessly
overloaded by subscribers trying to simultaneously access the congloms'
servers during prime time, takes action.
A first step might be for this ISP to log onto many of the TV networks'
servers and fetch whatever they have to offer. Then stream this content as
real-time-only IP multicasts over his own network. (And block direct access
to the TV networks' servers from individual subscribers.)
Let's assume this ISP is still using only 1 Gb/s Ethernet in his core
network. He can support 50 streams of multicast 18 Mb/s HDTV, with some
change for other stuff. Or, obviously, many more streams if a mix of this
very high quality HD and lesser HD, or even SD.
But, since the ISP is probably using a passive optical network, he should be
able to upgrade the core of his network to 10G Ethernet without too much
trouble. And soon, 100G Ethernet, which is in the works at the IEEE. So
clearly, if using IP multicast, there is no major issue.
The VOD part requires local servers. Let's say each server passes 500 homes.
So again, if each server reaches the 500 homes via 1G Ethernet, only 50 of
the highest quality HD programs could be offered to the 500 homes at any
given time, as individual streams. But when the ISP upgrades to 10G, each
home could access an individual VOD 18 Mb/s HD stream at any time.
Obviously, this is technically harder to do than broadcast and local
recording. That's why it's taking so long. But once the technology exists,
and is in place, who cares how difficult the underlying circuits are? If the
congloms are willing to have more of their content made available directly
to the viewers, in the living room or den, over the Internet, I think for
sure ISPs will take action and make it happen.
Bert
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