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116 AltiWare ACC 5.1 Administration Manual
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 should be 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.
The Match Result Button
Clicking the Match Result button shows you the result you got the last time you clicked
the Match Impedance button for that trunk. The following dialog box is displayed:
Figure 10. Impedance Match Result dialog box
Measuring the Rx Level of a Trunk Channel
In order to perform this test, you need to obtain the local CO’s Milli-Watt Test Number
from your CO. When dialing this number, a 0dB tone is sent. For example, if your number
is 510-252-9712, the Milli-Watt Test Number from the local CO is 510-252-0020 (the
prefix 510-252 is the same).
1. Write down the Rx Gain, then set it to 0dB and click OK.
2. Write down the Impedance setting, then change it to 600ohm, and click OK.
3. Call the number you got from your CO, as noted above.