Altigen ACM 6.7 Administrator's Manual page 143

Figure 61. 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
Interface Type
Incoming Ring
Impedance
Description
Select the type of trunk that will interface with this trunk
channel:
Loop Start Trunk
•
• Ground Start Trunk
Single—Default setting for North America
Double—For countries using Ring-Ring-Silent type of ring
pattern
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.
MAXCS ACM 6.7 Administration Manual 129
Triton Analog Trunk GS/LS Properties