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Path: utzoo!watmath!clyde!rutgers!ames!oliveb!felix!zemon
From: zemon@felix.UUCP
Newsgroups: comp.dcom.modems
Subject: Re: 2400 Baud MNP Correction Synchronization
Message-ID: <2307@felix.UUCP>
Date: Thu, 19-Feb-87 22:53:14 EST
Article-I.D.: felix.2307
Posted: Thu Feb 19 22:53:14 1987
Date-Received: Sat, 21-Feb-87 05:59:26 EST
References: <2607@well.UUCP>
Sender: root@felix.UUCP
Reply-To: zemon@felix.UUCP (Art Zemon)
Organization: FileNet Corp., Costa Mesa, CA
Lines: 41

In article <2607@well.UUCP> ewhac@well.UUCP (Leo 'Bols Ewhac' Schwab) writes:
>	I've been having trouble with this.  When I call up some local
>non-MNP modems in Auto-Reliable mode (as the manual calls it), I get
>garbage, as though the modem I'm calling is running at the wrong baud rate.
>Sometimes (rarely), this doesn't happen, and I get a good connection (with a
>non-MNP modem (by the way, I've never connected with an MNP modem)).

That could be because the system behind the modem you are
calling is running at the wrong baud rate.  I have the same
problem and here is what causes it:

1)  your modem (A) calls another modem (B)
2)  B whistles "hello -- I talk XXXX baud"
3)  A whistles "hello -- I talk that speed, too"
4)  B settles down and gets ready to interpret whistles as
    data and pass it along to its host computer
5)  A whistles "oh yeah -- Do you talk MNP?"
6)  B turns A's last whistle into bytes of data and sends
    the bytes along to its host computer
7)  B's host computer sees "random" data and assumes it is
    at the wrong baud rate, so it changes to another (300
    baud, perhaps)
8)  A doesn't hear any response so it assumes B cannot talk
    MNP
9)  A settles down to turn data into whistles and tells you
    "CONNECT" or some such message
10) you type <CR> and get garbage back from B's very
    confused host

The only solution I have thought of is to persuade B to buy
a better modem.  That's not very easy when B == Western
Union EasyLink.  Soooooo, one of my Racal-Vadic 2400 baud
modems is set to never use MNP.  Sigh.

If you want to try connecting to an MNP modem, send me
mail.  We can set up a UUCP link or something.
-- 
	-- Art Zemon
	   FileNet Corporation
	   Costa Mesa, California
	   ...!hplabs!felix!zemon