C
ONFIGURING
THE
V
OICE
ADSL R
OUTER
4-80
Port Advanced Setting
There are 11 advanced functions that can be configured in this screen.
•Volume Gain Control: Two modes are available. The fixed gain
control means the device is supported to supply a constant level of
amplification.
The adaptive mode means a specified power level is produced at the
output during periods of active speech.
•Jitter Buffer Mode: Three jitter modes are available. The fixed mode,
which is the default mode, is a simple first in first out mode, with a
fixed jitter buffer delay.
The adaptive mode optimizes the size of the jitter buffer delay in
response to network conditions.
The sequential mode is also a fixed jitter buffer delay mode, but in this
mode the jitter buffer function looks at the packet number for dropped
or out of sequence packet problems.
•Jitter Buffer Delay: This parameter represents the delay in
milliseconds that the jitter buffer waits before it transmits the data
samples that are collected from the host processor to the CODEC.
•Echo Canceller Delay: This is the function that filters out echoes
occurred during periods of active speech.
•VAD (Voice Activity Detection): If this box is checked, only a certain
level of voice volume will be send out as voice packets. This function
is designed to save the bandwidth.
•CNG (Comfort Noise Generation): Check this box to enable the
Comfort Noise Generation function. When no one is talking on a call
this feature will generate comfort noise in the background so you know
the call is active.