Carrier Detection in Solaris 8 for Dial in and Null Modem Connections Post: 302820883

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Operating Systems Solaris Carrier Detection in Solaris 8 for Dial in and Null Modem Connections Post 302820883 by rstor on Thursday 13th of June 2013 03:09:33 PM

06-13-2013

Registered User

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:

Code:

eeprom ttya-ignore-cd=true  
eeprom ttya-rts-dtr-off=true

Also I've specified the -S n parameter to disable software carrier detection:

Code:

/usr/sbin/pmadm -a -p zsmon -s ttya -i root \
-v `/usr/sbin/ttyadm -V` -fu -m "`/usr/sbin/ttyadm \
-p "login:" -d /dev/term/a -s /usr/bin/login -l contty2H from  -b \
-S n -m ldterm,ttcompat`" -y "dial in/out on serial port"

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

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AIRPORT-MODEM(1)					      General Commands Manual						  AIRPORT-MODEM(1)

NAME

       airport-modem  - Modem monitoring and hangup utility for the original Apple AirPort Base Station ("Graphite"), the Lucent RG-1000 base sta-
       tion and the Apple Airport Extreme base station

SYNOPSIS

       airport-modem

DESCRIPTION

       airport-modem allows you to monitor the state of the internal modem of your base station and to start/stop the modem connection.

       On the AirPort Extreme base station, the modem utility can also display the approximate duration of the modem connection.

OPTIONS

       airport-modem accepts no command-line options. airport-modem is a wrapper script around the AirportBaseStationHangup.jar jar  file  located
       in /usr/share/java/airport-utils.

       You  can set the JAVACMD environment variable to use a specific JVM instead of the one chosen by the wrapper script. Set the DEBUG environ-
       ment variable to 1 to get the debug output from the wrapper script.

ENVIRONMENT VARIABLES

       DEBUG  Set this variable to 1 to get the debug output from the wrapper script.

       JAVACMD
	      The full path to the Java Virtual Machine to use.  By  default,  the  wrapper  uses  JAVACMD;  if  it  is  not  set,  it	looks  for
	      JAVA_BINDIR/java, then for JAVA_HOME/bin/java before looking for a java executable in the PATH. In the latter case, the JVM used can
	      be configured using the Debian alternatives system (see update-alternatives(8)).

       JAVA_HOME
	      The full path where your JDK/JRE is installed.

       JAVA_BINDIR
	      The full path to the directory where the java executable is located.

       JAVA_ARGS
	      Extra command-line arguments to be passed to the Java Virtual Machine.

AUTHOR

       airport-modem was written by Jon Sevy <jsevy@cs.drexel.edu>.

       This manual page was written by Julien BLACHE <jblache@debian.org>, for the Debian project (but may be used by others).

								   May 20, 2006 						  AIRPORT-MODEM(1)