Altigen AltiContact Manager Version 5.0A, Administration Manual

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Triton Analog Trunk GS/LS Properties
7-14 AltiContact Manager Administration Manual
displayed, with information relevant to this trunk:
Figure 5. 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.
Note: If the Hybrid Echo Return Loss reading of a trunk is worse than
-6 dB, for example, -5 db, the trunk may be subject to VoIP voice
quality problems. Use this trunk to connect to analog phones only, or
configure it to be the least used trunk. (Acceptable range for Hybrid
Echo Return Loss is -6dB to -26dB.)
Noise Level desired measurement is less than -67dBm (acceptable
range is -67dBm to -90dBm).
2. Make calls from the trunks to test voice quality.
3. Repeat steps 1 and 2 for all other trunk channels.
If the Hybrid Echo Return Loss and Noise Level are not within the
acceptable range, take the following steps to troubleshoot:
1. Change the trunk to a different port on the Triton board, then diagnose
again (this is to rule out a hardware problem).
2. Check to see if any wire taps to the trunk wire (bridge tap). If so,
remove them, then test again.
3. Request the CO to check the trunk conditions, including Line Loss,
and longitudinal balance.