Hi all,
I use ts7250 for dial out. After dialing out the connection is
established and CD on the US Robotic turned on (CD is Carrier Detect
and this signal indicates if a dial tone is present. This will be
true when the modem is off hook and a dial tone is presents)
If I kill the pppd process then pppd gracefully exits and CD on
modem will turn off. (I believe because pppd send +++AT command to
the modem and tells it to hang up the telephone line).
If I turn off the TS7250 in the middle of dial out and pppd cannot
graceful exits, then the modem stuck and I cannot dial out again
after the ts7250 reset. The connect script will fail. In the log
there is a message "cannot turn off soft carrier". Basically I
cannot send any AT command to the modem anymore. I even use mgetty
and mgetty.conf to set ATZ command to the modem, but it does not
work.
Our ts7250 is connecting to another system and that system controls
the power supply to ts7250. The system can do power cycle anytime
and it can happen in the middle of dial out (so pppd cannot
gracefully exits). Unfortunately the modem and the system are not in
the same power source and nobody is physically there to turn off the
modem.
I want to add a script on the startup of ts7250 to turn off CD on
modem, but I do not know how. Someone had the same problem in Sun
Solaris and their suggestion is using the hardware carrier detect,
/usr/etc/ttysoftcar -n /dev/ttyd0
and reconfig the kernel change the zs0 flag to 2,1 or 0
But we do not have ttysoftcar in our TS7250?
Please help!
Thank you so much for your time
Bonnie
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