FXO Line Impedance Matching Testing

This feature enables you to determine the best impedance value to configure for an analog FXO line. This option tests several impedance values to determine which value returns the best Echo Return Loss (ERL). Once this value is determined, you can configure it on the FXO channel.

Voice quality problems may be experienced in analog lines especially when long physical lines are plugged into the device's FXO ports. Poor quality in analog lines is mostly due to low ERL. These problems may be diminished if the appropriate adjustments are made to best match the FXO interface to the characteristics of the analog line in the particular country in which you have installed the device.