User Manual
U-SYS IAD108 Integrated Access Device
Chapter 8 Troubleshooting
8-19
parameter-140)/10. For example, if the subscriber sets the
parameter to 120, the actual gain is (120-140)10 = -2 dB.
The default value of this parameter is 140, which means the
default gain is 0 dB.
Generally, the above procedure can solve the echo and cutting
voice problem.
8.8
Voice Abnormality
8.8.1 Fault
Voice is too high or too low for IAD subscribers.
8.8.2 Cause
Too high or too low voice is related to system gain. This problem
can be solved by adjusting the sending gain of the peer end and the
receiving end of the local end, including the DSP input/output gain of
the voice pinch board, TG gain, and the receiving/sending gain of the
subscriber physical port. The functions of the gains are as follows:
z
The voice quality can be remarkably improved by adjusting
the receiving/sending gain of the IAD subscriber physical
port.
z
The voice quality can also be improved by adjusting the DSP
input/output gain, but the effect is not remarkable.
z
Adjusting the TG gain has an impact on the global office;
therefore, it is not recommended.
