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Path: utzoo!henry
From: henry@utzoo.UUCP (Henry Spencer)
Newsgroups: net.dcom
Subject: Re: unasked-for autobauding
Message-ID: <7230@utzoo.UUCP>
Date: Wed, 15-Oct-86 12:40:49 EDT
Article-I.D.: utzoo.7230
Posted: Wed Oct 15 12:40:49 1986
Date-Received: Wed, 15-Oct-86 12:40:49 EDT
References: <7208@utzoo.UUCP> <152@dlb.UUCP> <444@brl-sem.ARPA>, <154@dlb.UUCP>
Organization: U of Toronto Zoology
Lines: 20
Keywords: autobaud

> In article <444@brl-sem.ARPA> Ron Natalie says, and I quote:
> >If it says 300, it is definitely WRONG.  Typing anything at the computer
> >in 103 mode is not likely to make you very popular with autobauding
> >machines.  The 1200 and 2400 messages are OK since the modem tones
> >themselves imply the Baud Rate. 
> 
> Getty listens to the digital portion of the line, not the analog, and can't
> hear the tones.  Why does the fact that the MODEM can recognize the speed
> make those messages ok?

I believe Ron's point was that the signalling tones for 1200 and 2400 imply
a unique baud rate, so it is reasonable for the modem to tell the host about
it (although one may debate the wisdom of this particular method).  But in
103 mode, the baud rate is *not* uniquely known -- it could be 300, 150,
134.5, 110, or several other still less likely values, all of which use the
103 signalling tones.  Admittedly nowadays 300 is by far the most probable
speed when you hear 103 tones, but it's not the only possibility.
-- 
				Henry Spencer @ U of Toronto Zoology
				{allegra,ihnp4,decvax,pyramid}!utzoo!henry