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From: zemon@felix.UUCP
Newsgroups: comp.unix.ultrix
Subject: Re: Autobauding and modems
Message-ID: <11065@felix.UUCP>
Date: Thu, 29-Oct-87 13:34:10 EST
Article-I.D.: felix.11065
Posted: Thu Oct 29 13:34:10 1987
Date-Received: Sun, 1-Nov-87 01:00:15 EST
References: <11008@felix.UUCP>
Sender: zemon@felix.UUCP
Organization: National University, San Diego
Lines: 19
Approved: zemon@felix.UUCP

Reply-Path:

In article <11008@felix.UUCP>, lwv@n8emr.UUCP (Larry W. Virden) writes:
> 2.  Is there ANYWAY that we can set up the system so that a naieve
> user, coming in to a modem capable of autobauding, can have the modem
> [comment about sending breaks for speeding]

	If your system is anything like ours, if you make shure that
your gettydefs definitions cycle from higher to lower speeds [i.e.
2400->1200->300->2400] the pressing of return repeatedly will sellect
the speed by cycling until you reach the valid speed.
	The system should continue to advance every time you get an
"invalid character or break" so it should work.  The big problem is
that some machines will not necessarily reccognize a CR at 2400 when
gettys are expecting 300.  The the shorter character frame will not
trigger the sense if you go 300->1200->2400->300.  [i.e. if you send
a CR at 2400 it will not necessarily invalidate a 300 baud frame because
of the timing of the start and stop bits (this is especially noticable
when you are at 19.2 while gettys is expecting 1200)]

Rob.