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Path: utzoo!watmath!clyde!cbosgd!ihnp4!houxm!hou2h!hhs
From: hhs@hou2h.UUCP (H.SHARP)
Newsgroups: net.dcom
Subject: Hayes 2400 bps modem
Message-ID: <1066@hou2h.UUCP>
Date: Thu, 3-Oct-85 14:47:26 EDT
Article-I.D.: hou2h.1066
Posted: Thu Oct  3 14:47:26 1985
Date-Received: Fri, 4-Oct-85 05:34:58 EDT
Organization: AT&T Bell Labs, Holmdel NJ
Lines: 25


	A month ago or so I posted an article about a 
problem I had with a Hayes Smartmodem 2400.  The problem
was that when I ran the modem at 1200 bps (with my terminal
set at 1200 bps), after the "CONNECT 1200" came up on the 
screen, I got garbage on the screen instead of the usual greeting.
The garbage looked like a speed mismatch problem, but it wasn't.

	I have found a solution to the problem, but I am still
not quite sure what the problem was.  When I set up the options on
the Hayes I chose the Bell mode instead of the CCITT mode.
The ATB1 command options the modem to use BELL 212A at 1200 bps
and the ATB0 command options the modem to use CCITT V.22.
I have found that when I set the modem with either the ATB0
command or the ATB1 command I get garbage on the screen 3 out of
4 times (or worse).  When I use the ATB command, the connection 
works fine.  I could not find any detailed information on what
exactly the ATB command does, but it is lumped together with the
CCITT mode. If anyone has a suggestion as to what this means
I would appreciate a reply.
(The connection works fine when I use an AT&T 212, an
AT&T 2224 and the integral modem on my AT&T - Teletype 4425
terminal.)


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