Path: utzoo!attcan!uunet!nems!mimsy!haven!udel!princeton!njsmu!telesci!kindred
From: kindred@pyrite.telesci.UUCP (David L Kindred (Dave))
Newsgroups: comp.dcom.modems
Subject: Re: Why 300 baud?
Message-ID: <KINDRED.90May31185056@pyrite.telesci.UUCP>
Date: 31 May 90 22:50:56 GMT
References: <9686@discus.technion.ac.il>
	<1990May31.025608.18545@Neon.Stanford.EDU>
Sender: news@telesci.UUCP
Reply-To: kindred@telesci.uucp
Organization: Telesciences CO Systems, Inc.
Lines: 31
In-reply-to: kaufman@Neon.Stanford.EDU's message of 31 May 90 02:56:08 GMT

In article <1990May31.025608.18545@Neon.Stanford.EDU> kaufman@Neon.Stanford.EDU (Marc T. Kaufman) writes:

   In article <9686@discus.technion.ac.il> joel%techunix.bitnet@jade.berkeley.edu (Yossi (Joel) Hoffman) writes:
   >I was wondering:  why is it that all the common modem speeds are
   >multiples of 300 baud?  Is there anything special about that number?
<lot's deleted>
   the next logical
   baud rate was 300.  The Bell 212 actually runs at 600 baud, coding 2 bits
   per symbol.  The natural progression was then, 1200, 2400, 4800, 9600, 19200.
<more deleted>
   ANSI was trying to standardize baud rates during the same time frame, and so
   there is an ANSI standard somewhere setting standard baud rates at 200, 400,
   800, 1600, etc.
<more deleted>
   Not to be outdone, IBM -- who always want proprietary hardware, started using
   1800, 3600, 7200, and 14400 bps as their synchronous bit rates.
<more deleted>

	Along the lines a strange baud rates, I personally have run
into the all time favorite baud rates of 134.5 and 1050.  The 134.5
was used in a six bit commodities ticker, but I can not remember what
used 1050, I ran into it while working for a company that was doing
work for the Associated Press, so I suspect it was used in some of
their older network equipment.  For really old equipment, 50 and 75
baud were also used.
--

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