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Diffstat (limited to 'xpp/README.metering')
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diff --git a/xpp/README.metering b/xpp/README.metering new file mode 100644 index 0000000..4736b81 --- /dev/null +++ b/xpp/README.metering @@ -0,0 +1,50 @@ +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). |