AltiGen comm ACM 5.1 Performing Impedance Match on Your Own, Using the Match Impedance Button

	Chapter 12: Trunk Configuration
Parameter	Description
Rx Level at 600 Ohms	The Rx Level measurement at 600 Ohms, obtained by
	clicking the Test Rx Level button. See Test Rx Level
	button, below.
Test Rx Level button	Tests the receiving level of the trunk channel on a call to
	your local CO’s Milli-Watt Test Number after you set the
	Impedance parameter to 600 Ohms and the Rx Gain to
	0dB. Results are displayed in the Rx Level at 600 Ohms
	field.

Performing Impedance Match on Your Own

For each individual analog trunk that is connected to the CO when the system starts up, AltiWare automatically selects an impedance profile to best match the Triton trunk interface with the CO. In the unlikely event that this automatic selection does not yield the optimal voice quality, you may want to disable the feature and select the best impedance by trial and error method.

To disable automatic impedance matching, check the Disable Impedance Match During System Startup check box.

Using the Match Impedance Button

Whenever a new analog trunk is connected to an empty port or is replacing an existing trunk, you will need to use the Match Impedance button to select the best impedance profile.

To do this, follow these steps:

1.Click the Impedance Match button. While the impedance match is in process, you’ll see a “progress” box.

When the process is complete, the Match Impedance dialog box is displayed, with information relevant to this trunk:

Figure 9. Match Impedance dialog box

The Impedance parameter setting in the main dialog box is changed to the best match selection, and the measurement for noise and returned echo is performed with this impedance setting. The results of this measurement are displayed in the Diagnosis section of the main dialog box. The Hybrid Echo Return Loss field shows the measurement before adaptation of the selected Impedance profile, and the Echo Return Loss field shows the measurement after adaptation of the selected Impedance profile.

AltiWare ACM 5.1 Administration Manual 163