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From: hta@uninett.no (Harald T. Alvestrand)
Newsgroups: comp.os.linux.development,comp.os.linux.misc,comp.os.386bsd.questions,comp.os.386bsd.misc,sci.electronics
Subject: Re: 16550 detection
Followup-To: sci.electronics
Date: 3 Nov 1994 10:01:54 GMT
Organization: Uninett
Lines: 28
Distribution: world
Message-ID: <39acei$1vt@trane.uninett.no>
References: <CMETZ.94Oct30051603@itchy.inner.net> <SRA.94Oct30162124@rurha-pente.epilogue.com> <CMETZ.94Oct30192816@itchy.inner.net> <CyIzxz.97A@cuug.ab.ca> <TYTSO.94Oct31162517@dcl.mit.edu> <MICHAELV.94Oct31211019@MindBender.HeadCandy.com> <TYTSO.94Nov1182557@dcl.mit.edu> <MICHAELV.94Nov1215132@MindBender.HeadCandy.com> <TYTSO.94Nov2113942@dcl.mit.edu> <JKH.94Nov2210122@freefall.cdrom.com>
NNTP-Posting-Host: domen.uninett.no
In article <JKH.94Nov2210122@freefall.cdrom.com>, jkh@freefall.cdrom.com (Jordan K. Hubbard) writes:
|> 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? I remember
|> quite a bit of discussion on this in the early 80's!
You are probably confusing two proofs.
Shannon proved the maximum rate of information transfer given frequency
range available and signal/noise ratio.
The other guy (I don't remember his name) proved the maximum rate of
state changes (which is bitrate when you only have 2 states).
I know 9600 bps modems still run at 2400 state changes/second; I have
no reason to think that 28.800 modems run any faster; they just have
a larger statespace.
Help stamp out long newsgroup lines - followup set to sci.electronics.
--
Harald Tveit Alvestrand
Harald.T.Alvestrand@uninett.no
G=Harald;I=T;S=Alvestrand;O=uninett;P=uninett;C=no
+47 73 59 70 94
My son's name is Torbjørn. The letter between "j" and "r" is o with a slash.