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From: mats@forbrk.UUCP
Newsgroups: comp.dcom.modems
Subject: more on 2400 baud modems
Message-ID: <189@forbrk.UUCP>
Date: Wed, 11-Feb-87 19:31:56 EST
Article-I.D.: forbrk.189
Posted: Wed Feb 11 19:31:56 1987
Date-Received: Fri, 13-Feb-87 00:16:40 EST
Distribution: na
Organization: Fortune Systems/Berkeley, Berkeley CA
Lines: 48

Okay, we have had lots of "this modem costs $314.15927" and
"that modem did well in the Byte Review". I want to turn
the topic in a different direction: useability on my system.
At this particular office, we only have one data line; the
voice lines are on a Merlin so I don't want to mess with them.
Thus, I need my line to be bidirectional - both incoming and
outgoing calls. The system is one of our own boxes, running
V.2 (but with the uucp/cu code out of V.3, i.e. HoneyDanBer).

When we opened the office, we only had an old Cermetek available.
Lacking the time and inclination to fiddle with the internal
strap settings to synthesize the right signals to make an
outgoing connection, we operated as answer-only. The company
just got the Hayes 2400 baud modems they ordered (against my
recommendation), and sent one up here. Now we are originate-only
(in other words, now it all goes on my phone bill).

Why? The Hayes "Smartmodem" has "a few" problems (besides just
the fact that it is a Hayes). 
Problem 1: the modem has a result code sequence which is activated
    for answered calls as well as originated calls. This is
    wrong - the result codes should only come back when I
    originate a call. I don't want to be sent "RING" and
    "CONNECT" when someone calls me.
Problem 2: the modem does automatic baud rate detection on both
    call originate and call answer. This is not what I want;
    I want the receiving modem to match my originate speed if
    possible. If not possible, I want to terminate the connection
    and try again at another speed (actually, I want my
    Systems file to determine which speed to try first, and
    whether to try again at a different speed). When *I*
    am the receiving modem, I want to select the same speed
    as the modem the called me; the guy on the other end can
    then cycle through my gettydefs entries until he finds
    the right baud rate uugetty. Simple, right?

This is *not* a request for help (I can solve 1) without too much
headache and don't yet have an answer for 2) ). Instead, I want
to stimulate some discussion of whether a particular modem
works the way the user needs it to. I turn thumbs down on the
Hayes because it does not fit my need (although I can't swap it
out for something different, unfortunately).

How do other 2400 baud modems handle the interesting question of
baud rate detection?

Mats Wichmann
Fortune Systems