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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: [Nanog] ATT VP: Internet to hit capacity by 2010
Once upon a time, Simon Lockhart <[email protected]> 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 <[email protected]> Systems and Network Administrator - HiWAAY Internet Services I don't speak for anybody but myself - that's enough trouble. _______________________________________________ NANOG mailing list [email protected] http://mailman.nanog.org/mailman/listinfo/nanog
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