Red Hat Bugzilla – Bug 348
Erratic response from modem
Last modified: 2008-05-01 11:37:48 EDT
I'm trying to get a fax modem working with efax under Redhat
5.2 without success. I think the problem is that the modem
is not sending responses back to the efax software.
When I try to use minicom to test the connection, I
initially get no echo of commands. I still get no echo
when I issue "ATE1". When I use ctrl-a z, and select the
option to toggle local Echo on/off, I then see commands
echoed; however, there is no OK response.
The strange thing is that if I do nothing for about 10
minutes, then type AT, I suddenly get double echo, e.g.,
"atat", followed by the OK prompt. If I then toggle local
Echo on/off, everything seems to work ok.
If, instead of using minicom, I do "cu -l /dev/modem", I get
"Connected", but I cannot get an "OK" response from the
modem, nor do I see my commands echoed back to the terminal
even though I issued ATE1 (echo keyboard input).
Using either minicom or cu, I can dial another phone number
(e.g., "ATDT[number]") in my office and get a ring, even
though I never get any responses from the modem.
I've tried two different modems with the same results. I am
using the same cable I used with the modem when I was
Any ideas would be appreciated.
You may want to install the setserial RPM and use the setserial
program to make sure you are using the right IRQ number.
This is a modem configuration issue. We were unable to replicate it in
the test lab.