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cmx(8)									cmx(8)

NAME
       cmx - Generic communication exerciser

SYNOPSIS
       /usr/field/cmx  [-b  [minbaud]-[maxbaud]]  [-h] [-ofile] [-tn] -l line-
       n...

OPTIONS
       Use this option to specify the minimum, maximum, or range of baud rates
       to  test.   Prints  help	 messages about the cmx command.  Test all the
       listed tty lines, where n equals the lines to  test  according  to  the
       special	device	file entries in the /dev directory, such as 00, 12, or
       42-53 Saves output diagnostics in file.	Specifies the run time in min‐
       utes  (n).  The default is to run until a [CTRL-C] or a kill -15 pid is
       sent to the process.

DESCRIPTION
       The cmx exerciser writes, reads, and validates random data  and	packet
       lengths	on a specified communications line. The line being tested must
       have a loopback connector attached to the distribution  panel,  or  the
       cable and the line must be disabled in the /etc/inittab file and a non-
       modem line; the CLOCAL option must be set to on.

       The exerciser runs until a [CTRL-C] or a kill -15 pid is	 sent  to  the
       process.

       A  logfile for you to examine and then remove is created in the current
       working directory; errors can be listed in the logfile.

       You must specify the -l option followed by the lines to test. The line-
       n  arguments identify the lines to be tested. A maximum of 32 lines can
       be tested at any one time.  The line-n arguments are specified as names
       taken  from the /dev directory without the letters “tty.”  For example,
       if the /dev directory lists tty03, the line-n argument is 03.

       The Devices section lists the devices that can be tested.

RESTRICTIONS
       If you want to run a system exerciser over an NFS link or on a diskless
       system,	there  are  some  restrictions.	 For exercisers such as fsx(8)
       that need to write into a file system, the target file system  must  be
       writable	 by  root. Also, the directory from which an exerciser is exe‐
       cuted must be writable by root because temporary files are written into
       the  directory.	 These	restrictions  can  be  difficult  to adhere to
       because NFS file systems are often mounted in a way that prevents  root
       from  writing into them.	 Some of the restrictions may be adhered to by
       copying the exerciser into another directory and then executing it.

       Pseudo devices (devices whose first character after tty is  any	alpha‐
       betic  character,  other	 than lowercase d) cannot be tested.  Also lat
       devices with major #5 cannot be tested.

DEVICES
       Use the file command on /dev/tty* to find out  which  tty  line	corre‐
       sponds to a device line number.

EXAMPLES
       The  following  example	runs the cmx exerciser for 60 minutes on lines
       00, 13, 22, and 32: % /usr/field/cmx -t60 -l 00 13 22 32 The  following
       example runs the cmx exerciser on lines 11, 42, 45, and 76 in the back‐
       ground  until  interrupted  by  a  [CTRL-C]  or	a  kill	 -15  pid:   %
       /usr/field/cmx  -l  11  42  45  76 & The following example runs the cmx
       exerciser on line 11, specifying a range of  baud  rates	 to  test.   %
       /usr/field/cmx -b9600-38400 -l 11

SEE ALSO
       Commands: diskx(8), fsx(8), memx(8), shmx(8), tapex(8)

									cmx(8)
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