AltiGen MAXCS 7.0 Update 1 ACM Administration - Manual (Page 166)

Chapter 12: Trunk Configuration
150 MaxCS 7.5 Administration Manual
Figure 94. Triton Analog Trunk GS/LS Properties window
Note that you can use Apply to in this dialog box to apply changes to other trunks of the same type.
Parameter Description
Interface Type
Select the type of trunk that will interface with this trunk channel:
• Loop Start Trunk
• Ground Start Trunk
Incoming Ring
Single – Default setting for North America
Double – For countries using Ring-Ring-Silent type of ring pattern
Impedance
The resistance of electrical current to alternating current, measured in
Ohms. Impedance occurs when power or signal is transferred from one
circuit to another. When a trunk interface impedance is greatly
mismatched with the CO analog line, it may result in static noise and
echo heard by IP phone users. The system automatically selects the
impedance profile that best matches the Triton trunk interface with the
CO. In the rare case where you are not getting the best match, you can
disable this feature by checking Disable Impedance Match During
System Startup
, and you can set the Impedance manually.
Match Impedance button
Changes the Impedance setting to the best match for the selected
trunk channel, and then measures noise and returned echo with this im-
pedance setting. Results are displayed in the Diagnosis section of the
dialog box. The system automatically runs a matching test upon system
startup, unless you disable the feature. If later you connect a new ana-
log line to an empty port or replace an existing line, you need to click
this button to best match the impedance.