Intermittant modem failure? (fwd)

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Hi mgetty-list,

has anybody an idea about this? My guess would be "cheap modems", but I
can't say [no modem type mentioned]. Maybe someone else has already
experienced and solved this?

gert

----- Forwarded message from Jon Lewis -----

*From inorganic5.fdt.net!jlewis Fri Oct 10 21:41:42 1997
Date: Fri, 10 Oct 1997 15:41:25 -0400
From: Jon Lewis <jlewis@inorganic5.fdt.net>
To: gert@greenie.muc.de
Subject: Intermittant modem failure?
Message-ID: <Pine.LNX.3.95.971010141130.600G-100000@inorganic5.fdt.net>
X-To-Stop-Spam-See: http://inorganic5.fdt.net/~jlewis/spam.html

I've got a couple of linux term servers running mgetty 0.98 and see things
like the following on a number of ports each day.

10/10 03:33:45 yRB checking if modem is still alive
10/10 03:33:46 yRB fax_send: 'AT' -> OK
10/10 03:33:46 yRB waiting...
10/10 03:48:46 yRB checking if modem is still alive
10/10 03:48:47 yRB fax_send: 'AT'
10/10 03:49:07 yRB Warning: got alarm signal!
10/10 03:49:07 yRB fax_read_byte: read returned -1: Interrupted system call
10/10 03:49:07 yRB fax_get_line: cannot read byte, return: Interrupted
system call -> ERROR
10/10 03:49:07 yRB fax_send: 'AT' -> OK
10/10 03:49:08 yRB waiting...

I saw in the docs that this can be caused by linux sending characters too
fast to the modem, so I increased from 50 to 150 each of these:

#define DO_CHAT_SEND_DELAY 150 
 /* and this is the delay before sending each command while in fax mode
 */
#define FAX_COMMAND_DELAY 150

Should I try bigger numbers, or could the problem be something else?

In the above case, it's a P100 running 2.0.31-pre10 with a couple of
Comtrol RocketPort cards with all ports at 115200bps.

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----- End of forwarded message from Jon Lewis -----

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