[Nanog] ATT VP: Internet to hit capacity by 2010

Bruce Curtis bruce.curtis at ndsu.edu
Tue Apr 22 09:05:58 CDT 2008


   p2p isn't the only way to deliver content overnight, content could  
also be delivered via multicast overnight.

http://www.intercast.com/Eng/Index.asp

http://kazam.com/Eng/About/About.jsp



On Apr 22, 2008, at 5:33 AM, <michael.dillon at bt.com> wrote:

>
>>> I think you're too high there! MPEG2 SD is around 4-6Mbps,
>> MPEG4 SD is
>>> around 2-4Mbps, MPEG4 HD is anywhere from 8 to 20Mbps, depending on
>>> how much wow factor the broadcaster is trying to give.
>>
>> Nope, ATSC is 19 (more accurately 19.28) megabits per second.
>
> So why would anyone plug an ATSC feed directly into the Internet?
> Are there any devices that can play it other than a TV set?
> Why wouldn't a video services company transcode it to MPEG4 and
> transmit that?
>
> I can see that some cable/DSL companies might transmit ATSC to
> subscribers
> but they would also operate local receivers so that the traffic never
> touches their core. Rather like what a cable company does today with  
> TV
> receivers in their head ends.
>
> All this talk of exafloods seems to ignore the basic economics of
> IP networks. No ISP is going to allow subscribers to pull in 8gigs
> per day of video stream. And no broadcaster is going to pay for the
> bandwidth needed to pump out all those ATSC streams. And nobody is
> going to stick IP multicast (and multicast peering) in the core just
> to deal with video streams to people who leave their TV on all day
> whether
> they are at home or not.
>
> At best you will see IP multicast on a city-wide basis in a single
> ISP's network. Also note that IP multicast only works for live  
> broadcast
> TV. In today's world there isn't much of that except for news.
> Everything
> else is prerecorded and thus it COULD be transmitted at any time. IP
> multicast
> does not help you when you have 1000 subscribers all pulling in 1000
> unique
> streams. In the 1960's it was reasonable to think that you could  
> deliver
> the
> same video to all consumers because everybody was the same in one big
> melting
> pot. But that day is long gone.
>
> On the other hand, P2P software could be leveraged to download video
> files
> during off-peak hours on the network. All it takes is some cooperation
> between
> P2P software developers and ISPs so that you have P2P clients which  
> can
> be told
> to lay off during peak hours, or when they want something from the  
> other
> side
> of a congested peering circuit. Better yet, the ISP's P2P manager  
> could
> arrange
> for one full copy of that file to get across the congested peering
> circuit during
> the time period most favorable for that single circuit, then  
> distribute
> elsewhere.
>
> --Michael Dillon
>
> As far as I am concerned the killer application for IP multicast is
> *NOT* video,
> it's market data feeds from NYSE, NASDAQ, CBOT, etc.
>
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>


---
Bruce Curtis                         bruce.curtis at ndsu.edu
Certified NetAnalyst II                701-231-8527
North Dakota State University





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