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AT-T SYN 248 Manual

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Syn248 Installation and Configuration Guide Back to Contents
Troubleshooting 87
Resolving Audio Echoes
The SB35010 Gateway uses automatic telephone line calibration to ensure optimal audio
performance on outside calls. If excessive echo occurs on outside calls consistently,
observe the Gateway line calibration data to understand any telephone line issues.
Occasional echoes may be caused by the other person’s phone.
To resolve audio echo issues:
1. Log on to the WebUI as administrator. Click Device Management, then Device Log
in the navigation menu at left.
2. Select the Gateway from the drop-down list. Line Calibration Data appears as shown
in Figure 26.
3. Check the loss numbers within the Line Calibration Data box for each telephone line
on each Gateway. (A loss number above 10 indicates good audio performance.)
Figure 26. Line Calibration Data
4. If the loss number is below 10, the system will most often function normally, but
there is an increased likelihood of audio performance issues like echo. If the loss
number is below 10 the following procedures can be used to increase the loss value:
a. Unplug that telephone line at the Gateway.
b. After the line LED turns red and waiting 15 to 30 seconds, plug the line back in
to recalibrate.
5. If the recalibration has no effect, a parallel device such as a fax adapter, alarm
system, DSL modem, or DSL splitter/filter may be connected to the system. Parallel
external devices may affect line calibration. Disconnect these devices from the
telephone wall jacks that are connected to the same telephone lines, as follows:
a. Unplug these non-system external devices from their telephone wall jacks.
b. Unplug the telephone line connections from the Gateway.
c. After the Gateway Line-Status LEDs turn red and waiting 15 to 30 seconds, plug
the telephone lines into the Gateway again to recalibrate.
d. If there is a significant increase in the loss number and improved audio
performance on those lines after disconnecting a parallel device, consult your
telephone service provider to either investigate the problem or to install separate
lines for those parallel devices.
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