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).