NAME

       measerl - Measure the echo-return loss on Voicetronix telephony hardware

SYNOPSIS

       measerl [options]

DESCRIPTION

       The  measerl  utility  tests  the  echo-return  loss on the phone line.  For hardware that
       supports it, it can scan through bybrid balance register  settings  to  help  establish  a
       lower  ERL.   Having a lower ERL improves DTMF cutthrough and audio quality.  The software
       echo cancellation needs at least -6dB before it can make a difference.

       FXS (station) ports should perform this test using the --nohook option  with  the  handset
       already off hook and the microphone muted.

       FXO (trunk) ports will answer to an incoming call.

       A  series  of  tones will be played down the line to determine the ERL in several parts of
       the audio spectrum.  You should avoid creating any other noise on the line while this test
       is running, or the results may be skewed.

OPTIONS

       The following options are available:

       --help, -?
              Show summary of options.

       --card number
              Explicitly select the card to test.  Default is card 0.

       --port number
              Explicitly select the port to test. Default is port 0 of the card being tested.

       --nohook
              Use this option for testing station (FXS) ports.

       --offhook
              Take an FXO port off hook immediately.  Don't wait for an incoming ring.

       --bal1 value

       --bal2 value

       --bal3 value
              Set  codec  hybrid  balance registers.  Only for hardware which explicitly supports
              that.

       --ec   Enable the echo canceller.

       --pg gain
              Set codec play gain.  Values may range from -12.0 to 12.0.

       --rg gain
              Set codec record gain.  Values may range from -12.0 to 12.0.

       --dial port
              Dial out another port on the same card.

       --dial port number
              Dial number from port on the same card.

       --scan file start end step
              Scan the hybrid balance register settings from start to end in increments of  step,
              recording  the  results to file.  Only for hardware that explicitly permits setting
              these registers.  Valid values for the start and end are in the range 0 - 255.

       --autoscan
              Automatically scan the codec balance values.

       --handset
              Proto handset mode.

       --loop Enable software loopback.

       --hostecho
              Enable the host based echo canceller.

SEE ALSO

       vpbecho(1), ringstat(1)

AUTHOR

       Ron Lee, Peter Wintulich, David Rowe, Voicetronix <support@voicetronix.com.au>

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