[4153] in linux-net channel archive
Re: USR-Courier
daemon@ATHENA.MIT.EDU (Theodore Y. Ts'o)
Thu Aug 22 16:07:52 1996
Date: Thu, 22 Aug 1996 14:22:47 -0400
From: "Theodore Y. Ts'o" <tytso@mit.edu>
To: Curtis Hays <hays@satcom.whit.org>
Cc: linux-net@vger.rutgers.edu, linux-ppp@vger.rutgers.edu
In-Reply-To: Curtis Hays's message of Thu, 22 Aug 1996 07:39:20 -0600,
<Pine.3.89.9608220700.A1931-0100000@satcom.whit.org>
Date: Thu, 22 Aug 1996 07:39:20 -0600
From: Curtis Hays <hays@satcom.whit.org>
I have 8 USR Courier V.everything modems hooked up to my Linux box. Slip/PPP
works, but sometimes, the modems hang after someone drops. I have a
uugetty handling the process. Previously we had AT&T 14.4 modems and this
never happened. Went to USR-Courier and now there is a problem. The
biggest problem is the TX and RX lights stay on, and the only way to
clear them is to kill the process... The problem is intermittent, so I
don't know if PPP isn't cleaning up after the user hangs up, or if DIP,
our slip server, isn't cleaning up. Or is it just an intermittent problem.
Any Ideas?
This sounds like the classic echo-war scenario. Make sure uugetty is
always keeping echo turned off on the serial port. It's probably a
timing issue related to when the modem outputs the "CARRIER
DISCONNECTED" message; if it does so after a misconfigured uugetty has
turned on echo, then the tty will echo those characters --- which will
cause the modem to echo the characters --- which will cause the tty to
echo the characters..... ad infinitum.
So check the configuration of your getty.
- Ted
