User guide

Chapter 12: Trunk Configuration
154 MAXCS ACC 6.7.1 Administration Manual
Performing Impedance Match on Your Own
For each individual analog trunk that is connected to the CO when the system starts up,
MAXCS automatically selects an impedance profile to best match the Triton trunk inter
-
face 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.
Trunk to Trunk Gain
This configuration is to set Gain for calls that involve two an-
alog trunks (one in and one out). Because an analog trunk
typically has energy loss of 3-12 dB, a two-trunk operation,
like VM out call and MobileExt, may have low volume issues
because energy loss is doubled. This configuration can com-
pensate for the energy loss. The valid range is 0 to 6 dB. Rec-
ommended value is 3 dB.
Caution: Setting the Gain too high may cause distortion in
voice quality and DTMF tone. Your CO may not be able to
recognize the dialing number if DTMF tones are distorted.
Last Diagnosis Time The last time the Diagnosis button was clicked.
Diagnose button
Use this button to view the Noise Level, Echo Return Loss,
and Hybrid Echo Return Loss, measured using the current
Impedance setting.
Noise Level
The noise level (displayed after you click the Diagnose
button or the Match Impedance button). Acceptable range
for Noise Level is less than -67 dBm in value. For example,
Noise Level of -72 dBm is good and -63 dBm is poor. You may
experience high background noise and low voice volume if
Noise Level is poor.
Echo Return Loss
The measurement for echo return loss (displayed after you
click the Diagnose button or the Match Impedance
button). Acceptable range for Echo Return Loss is less than -
12 dB. For example, Echo Return Loss of -19 dB is good and
-8dB is poor. The IP phone users may hear their voice coming
back (echo) if Echo Return Loss is poor.
Hybrid Echo Return Loss
The measurement for hybrid echo return loss (displayed
after you click the Diagnose button or the Match
Impedance button). Acceptable range for Hybrid Echo
Return Loss is less than -6 dB.
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.
Parameter Description