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From: shawn@marilyn.UUCP (Shawn P. Stanley)
Newsgroups: comp.dcom.modems
Subject: baud rate weirdness
Message-ID: <125@marilyn.UUCP>
Date: 11 Dec 90 04:50:02 GMT
Organization: Litfal
Lines: 19

I've noticed a problem with some modems that I don't know the cause of.
If someone could explain to me what's going on, perhaps I can solve the
problem.

I have written connection-handling software which begins the process of
waiting for a call/connect first by setting the serial port to the high
(2400) baud rate for the modem, then sends an "AT" sequence (these are
Hayes compatible modems) so that the modem knows the baud rate of the
serial port and can then answer with a CONNECT message at the serial
port's rate before switching to the caller's rate.

With two modems that I know of, a 2400-baud caller will find that the
answering modem connects at 1200 baud.  300 baud calls are fine; 1200
baud calls are fine.  But 2400-baud calls become 1200-baud connects.

What could explain this behavior?
--
Shawn P. Stanley         shawn@marilyn.marilyn.mn.org
tcnet!marilyn!shawn      {rosevax,crash}!orbit!marilyn!shawn