CHAPTER64 Analog Line Testing
Mediant 1000 Gateway & E-SBC | User's Manual
Where:
● <FXO Channel>: FXO channel that you want to test and configure.
● <Impedance Low limit>: Low level impedance value (0-15) that you want to test
● <Impedance High limit>: High level impedance value (0-15) that you want to test
● <Display Syslog>: Defines (0/1) if information is sent to Syslog during the test
The following example runs the test on FXO channel 4 with impedance levels 0 to 5 and sends the
output to Syslog (1):
>/VoiceEngn/AnalogLineTest>AnalogLineTest 4 0 5 1
Starting......
Check syslog for more information.
This command starts a test on channel 4.
Impedances 0-5 will be tested.
Messages are displayed in syslog during the test.
The following describes the sequence of events when you run the impedance matching test:
3. The test is run using the AnalogLineTest command.
4. The tested channel is opened with default parameters and set to off-hook state.
5. The channel is configured with the low level impedance value.
6. A call involving the channel is started.
7. A PCM Voice Prompt file is played in the TDM direction.
8. The returned echo is recorded in a second PCM file.
9. Both of these files are scanned simultaneously and an ERL value is obtained.
10. The above steps are repeated for each of the specified impedance levels.
11. When the test completes, the channel is on-hooked and closed.
The figure below shows the correlation between the impedance values in binary (0-15) and the
actual impedance values (Ohms).
Displaying Line Impedance Test Results
After you have run the line impedance test (as described in Running the Line Impedance Test on
the previous page), you can view the test results. The results include a list of impedance values
and DC levels relative to the measured ERL values. The higher the ERL, the better the impedance.
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