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OM configuration page: go to Trunk > Analog trunk.
MX configuration page: go to Trunk > Feature.
2)Select the correct Caller ID detection mode on the web GUI of the MX or OM device. (you have verified this on step 1.4)
OM configuration page: go to Trunk > Analog trunk.
MX configuration page: go to Trunk > Advanced.
3)Reconnect the PSTN subscriber line to the FXO port of MX or OM device and repeat the test call.
OM configuration page: go to System > TDM Capture.
MX configuration page: go to Tools > Analog Capture.
3.Analyze the captured file fxo.pcm and adjust some parameters on MX or OM deviceAnalyze the captured file fxo.pcm using the Cool Edit pro 2.1 software (sound editing program for windows) installed on your PC.
You can use the Cool Edit Pro to hear and analyze the Caller ID signal waveform characteristic of the captures FXO signal.
1)Take the waveform view below as an example for a normal Caller ID signal. The FSK based Caller ID signal display is very clear and can be detected.
2)Take the spectral view below as an example for a standard FSK based Caller ID signal and please take note on the duration time of the channel seizure signal. The channel seizure signal is used to signal the start of the data transmission to the CPE or TE to alert for an incoming message, and it conditions the receiver for the data. The standard seizure signal consists of 300 continuous bits (duration of 250 ms at 1200 bps) of alternating “0” (SPACE frequency) and “1” (MARK frequency).
Note:
3)MARK Frequency “1”. The standard FSK marking signal is composed of 180 ~ 190 bits of “1” (duration of 150 ~ 158 ms)
Note:
1) A non-standard caller ID signal of the gain value is automatically changed.
It is observed that the Caller ID signal has a special variation of the Gain value. Using the spectrum and waveform views on Cool Edit Pro, you can see that the distribution of weak signal is the same, thus rule out the possibility of line interference.
Waveform view of the Caller ID signal: the signal’s amplitude is continuously changing.
Spectrum view of the Caller ID signal: the signal is clearer to see which frequencies are most prevalent and brighter colors represent greater amplitude components.
Solution: Use an offline tool for analysis on Caller ID signal to determine the values for the channel SEIZURE signal and MARK signal. If it can display 3 stages of CID part without a problem, then you can use the dspdrv version later than version 197 to resolve the issue. If it cannot display, please also set parameter FXO_CID_GAIN to 6 to reduce amplitude variations.
Waveform view of the Caller ID signal: shows an interference in the Caller ID signal and it has a large amplitude variation at the middle portion of the signal.
Spectrum view of the Caller ID signal: the signal is clearer to see an interference that cuts-off the channel seizure signal at the middle part.
Analysis: If channel seizure signal is separated and the SEIZURE signal completed a 60ms signal time, then the Caller ID signal can still be detected on the device.
Spectrum view of the Caller ID signal: the signal is clearer to see that the channel SEIZURE signal length or duration time is not enough and not in accordance with the national standard.
Spectrum view of the Caller ID signal: the signal is clearer to see that MARK signal length or duration time is not enough and not in accordance with the national standard.
Solution: Use an offline tool for analysis on Caller ID signal to determine the values for the channel SEIZURE signal and MARK signal. If it can display 3 stages of CID part without a problem, then you can use the dspdrv version later than version 197 to resolve the issue.
Waveform view of the Caller ID signal: shows that the signal intensity is weak.
Spectrum view of the Caller ID signal: the signal is weak and not clear.
Solution: Increase GA value to 11 or higher. GA Parameter name is FXO_CID_GAIN (id=341).
Waveform view of the Caller ID signal: shows that the signal gain is too high.
Solution: Reduce the GA value to decrease the signal amplitude. (for example GA=6). GA Parameter name is FXO_CID_GAIN (id=341).
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