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From: fraserr@gtephx.UUCP (Ross Fraser)
Newsgroups: comp.dcom.modems
Subject: Dial-back modems
Message-ID: <43f20cbb.144c9@gtephx.UUCP>
Date: 20 Jun 89 15:39:40 GMT
Organization: AG Communication Systems, Phoenix, Arizona
Lines: 23

Is there any way that a Hayes-compatible called modem can control the baud 
rate used for a data call? My company uses a dial-back system for access to our
mainframe with 2400 bps modems. I also have a 2400 bps modem in my PC, but want
to force the data rate down to 1200 bps when I am using the PC for terminal
emulation because of the high error rate at 2400 bps. When I am using the PC
for file transfers with Kermit, 2400 bps is acceptable because the number of
packets retransmitted is low enough to yield a higher effective transfer rate
than with 1200 bps. 
,
My experience to date has been that the originating modem always requests a data
rate, and the called modem will respond with a modem tone indicating the highest
data rate it can handle (in my case 2400 bps). Setting my terminal emulator to
1200 bps does not work because the modem does not seem to hand-shake with
serial port until data synchronization has been achieved.
,
I have requested that the company set up two dial-back numbers - one at 1200 and
the other at 2400; but am not optimistic that this will be successful. 


-- 
  Ross Fraser @ AG Communication Systems, Phoenix AZ    

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