[103990] in North American Network Operators' Group
Re: [Nanog] ATT VP: Internet to hit capacity by 2010
daemon@ATHENA.MIT.EDU (Chris Adams)
Mon Apr 21 16:12:22 2008
Date: Mon, 21 Apr 2008 15:12:16 -0500
From: Chris Adams <cmadams@hiwaay.net>
To: nanog@nanog.org
Mail-Followup-To: Chris Adams <cmadams@hiwaay.net>, nanog@nanog.org
In-Reply-To: <20080421195739.GE10920@virtual.bogons.net>
Errors-To: nanog-bounces@nanog.org
Once upon a time, Simon Lockhart <simon@slimey.org> said:
> On Mon Apr 21, 2008 at 02:43:14PM -0500, Chris Adams wrote:
> > You're a little low. ATSC (the over-the-air digital broadcast format)
> > is 19 megabits per second or 8.55 gigabytes per hour.
>
> 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. That can
carry multiple sub-channels, or it can be used for a single channel.
Standard definition DVDs can be up to 10 megabits per second. Both only
use MPEG2; MPEG4 can be around half that for similar quality. The base
Blu-Ray data rate is 36 megabits per second (to allow for high quality
MPEG2 at up to 1080p60 resolution).
--
Chris Adams <cmadams@hiwaay.net>
Systems and Network Administrator - HiWAAY Internet Services
I don't speak for anybody but myself - that's enough trouble.
_______________________________________________
NANOG mailing list
NANOG@nanog.org
http://mailman.nanog.org/mailman/listinfo/nanog
