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Xref: sserve comp.os.linux.development:19420 comp.os.linux.misc:29833 comp.os.386bsd.questions:14479 comp.os.386bsd.misc:4103 sci.electronics:84198 Path: sserve!newshost.anu.edu.au!harbinger.cc.monash.edu.au!msuinfo!uwm.edu!spool.mu.edu!howland.reston.ans.net!pipex!demon!awfulhak.demon.co.uk!awfulhak.demon.co.uk!brian From: brian@awfulhak.demon.co.uk (Brian Somers) Newsgroups: comp.os.linux.development,comp.os.linux.misc,comp.os.386bsd.questions,comp.os.386bsd.misc,sci.electronics Subject: Re: 16550 detection Date: 15 Nov 1994 00:06:33 GMT Organization: None Lines: 33 Distribution: world Message-ID: <3a8u29$mi@awfulhak.demon.co.uk> References: <CMETZ.94Oct30051603@itchy.inner.net> <MICHAELV.94Nov1215132@MindBender.HeadCandy.com> <TYTSO.94Nov2113942@dcl.mit.edu> <JKH.94Nov2210122@freefall.cdrom.com> <Cyp34w.MxC@bonkers.taronga.com> NNTP-Posting-Host: awfulhak.demon.co.uk In article <Cyp34w.MxC@bonkers.taronga.com>, peter@bonkers.taronga.com (Peter da Silva) writes: |> In article <JKH.94Nov2210122@freefall.cdrom.com>, |> Jordan K. Hubbard <jkh@freefall.cdrom.com> wrote: |> >In article <TYTSO.94Nov2113942@dcl.mit.edu> tytso@athena.mit.edu (Theodore Y. Ts'o) writes: |> > A V.34 modem does 28.8kbps (and you're not going to see much better than |> > that, I suspect, due to silly things such as Shannon's Limit); on top of |> |> >Not to be irrelevant or anything, but wasn't Shannon's Limit used to |> >prove that modems couldn't go any faster than 2400 baud? |> |> They don't go over 2400 baud. That doesn't mean they can't go over 2400 |> bits per second. The Shannon limit for analog phone lines has been around |> 35000 bits per second as long as I can recall, so the AT&T Paradyne at 33600 |> is pretty much the end of the road. |> |> In fact the Telebit Trailblazer, one of the first really high speed modems, |> runs 18000-22000 bits per second at 7 baud. Yes, that's 7 state changes |> per second. Over 512 channels at 2-6 bits/baud/channel. And it's still |> about the most reliable modems out there for noisy lines. I don't get that. Baud means state changes per second ? What was the bit in the middle ? Where do the 2-6 bits on each of 512 channels come from ? Please inform someone who thought that bps was the same as baud of their ignorance.... Thanks ! -- Brian <brian@awfulhak.demon.co.uk> Don't _EVER_ lose your sense of humour....