SMDIAG(8)						     Linux Programmer's Manual							 SMDIAG(8)

NAME

       smdiag - Linux soundcard packet radio modem driver diagnostics utility

SYNOPSIS

       smdiag [-i device] [-d display] [ -ce ]

DESCRIPTION

       smdiag  may  help  to  adjust  the  audio levels of the soundcard modem driver, as well as to control the quality of the radio link. It may
       either display an oscilloscope like view of the input signal, or display an eye diagram.  The display may be  gated  with  DCD,	i.e.  only
       updated if the modem detects a data carrier.

OPTIONS

       smdiag accepts the following options:

       -i     The  device argument specifies the soundcard modem device which should be configured or interrogated.  It will usually have the fol-
	      lowing form: sm[0-3].

       -d     sets the address of the X server to display the window.

       -h     display an overview of the available command line parameters and exit.

       -c     toggle the carrier gating of the display.

       -e     display an eye diagram (overlay of the synchronized demodulator output) instead of an oscilloscope view of the input signal.

KEYS

       C      clears the window

       D      toggles the DCD gating.

       E      displays an eye diagram

       I      displays the input signal

       Q      quits smdiag

BUGS

       smdiag Reacts sluggishly to keypresses. The window size is fixed. For speed reasons, two square root operations per sample are  not  imple-
       mented in the AFSK 1200 baud modes. The eye diagram for the AFSK 1200 baud mode is therefore distorted.

SEE ALSO

       smmixer (8), sethdlc (8), linux/drivers/net/soundmodem.c

AUTHOR

       smdiag was written by Thomas Sailer (t.sailer@alumni.ethz.ch).

Smdiag 0.1							  1 October 1996							 SMDIAG(8)