Carrier Detection in Solaris 8 for Dial in and Null Modem Connections
I am having troubles with carrier detection for dialing in via a modem or direct connection via a null modem connection under Solaris 8 (i.e. login session remains active after the modem disconnects). I tried two different dumb modems (which do not respond to AT commands) on the machine that I am dialling into . I tested the CD output on one of the modems and found the appropriate voltage on the CD line when a carrier is detected/not detected (I have confirmed this using a volt meter and applying the appropriate carrier tone via a function generator). If you dial in, login, then hang up, and call back the previous session continues without prompting to login.
I then decided to try a null modem connection. When accessing the serial console on the Solaris 8 system using a null modem cable, the login session remains active when disconnecting the cable and plugging it back in. To my understanding this should not happen, in the first case with the modem, or with the null modem cable as I disabled software carrier detection:
Also I've specified the -S n parameter to disable software carrier detection:
The instructions that I followed to setup the dial in connection was from Celeste Stokely’s Tutorial on Solaris 2.x Modems and Terminals.
I decided to test out carrier detection on FreeBSD 9.1 on a different machine running within virtual box. I used a usb-serial dongle which shows up as ttyu0 on the BSD machine. Carrier detection appears to work. When I establish a null modem connection (using the same null modem cable that I tried on the Solaris machine) I receive a login prompt. If I login, and then unplug and plug back the null modem cable, I get the login prompt again and the old session does not continue.
I have read a post on-line about carrier detection in Solaris not working and being "broken".
It this correct? Is carrier detection a known bug/issue in Solaris 8?
Last edited by Scott; 06-13-2013 at 06:52 PM..
Reason: Please use code tags
Hello There,
I configure my Modem as follow.
Step1.
# admintool &
Then from Browse --> Serial Port
i select tta port and Edit --> Modify
From that i select Template : Modem:Dial Out
Baud Rate: 9600
Ok
Step 2
# tip /dev/cua/a
connected (1 Reply)
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sorry for repeating the same question many times,
i just set up a null modem, i am using this as reference :
DB25 DB9
-- -
2 TD ---- 2 RD
3 RD ---- 3 TD
4 RTS ---- 8 CTS
5 CTS ---- 7 RTS
7 GND ---- 5 GND
6 DSR -+
+--- 4 DTR
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