Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.2 11/03/84 (WLS Mods); site astrovax.UUCP
Path: utzoo!watmath!clyde!bonnie!akgua!astrovax!wls
From: wls@astrovax.UUCP (William L. Sebok)
Newsgroups: net.unix
Subject: Re: Framing errors and autobaud @ 2400
Message-ID: <565@astrovax.UUCP>
Date: Sun, 24-Mar-85 16:18:13 EST
Article-I.D.: astrovax.565
Posted: Sun Mar 24 16:18:13 1985
Date-Received: Mon, 25-Mar-85 02:48:13 EST
References: <15994@mgweed.UUCP>
Distribution: net
Organization: Princeton Univ. Astrophysics
Lines: 17

> 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.

I decided to take another tack here at astrovax.  I installed code in my
getty to add an option to explicitly autobaud on an initial carriage return.
The code to do this on 4.2 BSD was posted on 23-Nov-83 by Jim McKie
(jim@mcvax.UUCP).  This has the welcome side effect that it prevents modems
that echo dialing commands (or anything else) from getting into a conversation
with getty, which interprets the echoing of the login banner as an attempt to
login.
-- 
Bill Sebok			Princeton University, Astrophysics
{allegra,akgua,burl,cbosgd,decvax,ihnp4,noao,princeton,vax135}!astrovax!wls