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cmx(8)								       cmx(8)


  cmx -	Generic	communication exerciser


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


  -b [minbaud]-[maxbaud]
      Use this option to specify the minimum, maximum, or range	of baud	rates
      to test.

  -h  Prints help messages about the cmx command.

  -l line-n
      Test all the listed tty lines, where n equals the	lines to test accord-
      ing to the special device	file entries in	the /dev directory, such as
      00, 12, or 42-53

      Saves output diagnostics in file.

  -tn Specifies	the run	time in	minutes	(n).  The default is to	run until a
      [CTRL-C] or a kill -15 pid is sent to the	process.


  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 pro-

  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.


  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 executed 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 alphabetic
  character, other than	lowercase d) cannot be tested.	Also lat devices with
  major	#5 cannot be tested.


  Use the file command on /dev/tty* to find out	which tty line corresponds to
  a device line	number.


   1.  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

   2.  The following example runs the cmx exerciser on lines 11, 42, 45, and
       76 in the background until interrupted by a [CTRL-C] or a kill -15
	    % /usr/field/cmx -l	11 42 45 76 &&

   3.  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


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