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NAME    [Toc]    [Back]

       cmx - Generic communication exerciser

SYNOPSIS    [Toc]    [Back]

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

OPTIONS    [Toc]    [Back]

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

DESCRIPTION    [Toc]    [Back]

       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

       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    [Toc]    [Back]

       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

       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

DEVICES    [Toc]    [Back]

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

EXAMPLES    [Toc]    [Back]

       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 background 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    [Toc]    [Back]

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

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