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Astribank Metering Interface
""""""""""""""""""""""""""""
In analog phone lines, some PBX'es can generate/detect special tones
used for billing the call (phone metering).
Astribank FXS and FXO drivers now support these features if compiled
with -DWITH_METERING
Software interface:
FXS - To generate a metering pulse, write the channel number (0-7) into
the file:
/proc/xpp/XBUS-nn/XPD-mm/metering_gen
Where:
nn = XBUS number
mm = XPD number
Writing channel number 31 signifies a broadcast -- i.e: generate
metering pulse on all channels.
Example:
echo 31 > /proc/xpp/XBUS-00/XPD-00/metering_gen
FXO - To read current metering counters from an FXO, simply read:
/proc/xpp/XBUS-nn/XPD-mm/metering_read
The format is self documenting:
# Chan Meter (since last read)
0 5
1 0
2 12
...
Reading this file reset the counters. So the numbers always show
the meters since last read.
The metering register should be sampled at a rate which is double
than the highest expected metering pulses. This rate is adjustable
via a module parameter "poll_metering_interval". The current default
is 500ms which is good if the metering pulses are sent not more
often than once per second.
Remark: The FXS hardware can generate maximum 0.85 volt RMS, while the FXO
needs a minimum of 1.1 vold RMS for detection. Therefore, this
feature cannot be tested in a loopback (Astribank-FXS to Astribank-FXO).
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