Framing errors and autobaud @ 2400

[Randy King]

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It seems that autobauding from 1200 down to 300 by means of a framing
error is quite reliable when the 300-baud user types almost any character.
Hence for years uucp info has contained strings like:   login:--login:
where the "--" implied "send CR".

The reverse did not work, so the 1200-baud user would send a BREAK to
upshift the remote to 1200; hence  login:-BREAK-login:  for the uucp info.

Now I am finding that downshifting from 2400 baud to 1200 baud more closely
resembles the 300->1200 upshift in that sending a BREAK is the more reliable
way.  It is not always the case, however.  There are times when just a CR
from my 1200 baud modem calling a tri-speed modem at 2400 baud will cause
the port to fallback to 1200.  Many times, however, a BREAK is required to
cause the downshift.

If you have had experience with 2400 baud autobauding, including upshifts and
downshifts among the speeds from 110->2400, I'd like to hear about your
findings.  This would be important information for future releases of UUCP
information from sites with >1200 baud modems.

						Randy King
						AT&T-CP at MG
						ihnp4!mogul!rjk