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D-Link DIV-140 User Guide 13
Audio Configuration
Codec Priority:
Jitter Buffer Delay:
Packet Loss Rate:
Gain Settings:
Here you can select the priority of audio codecs. While
establishing a call, the DlV-140 will negotiate the highest
priority of codec acceptable to both parties. The administrator
can choose from four codecs. G.711 Mu and G.711 A provide
the best voice quality but consume the most bandwidth. G.723
consumes less bandwidth with some compromise on quality.
G.729 is a compromise between both. It uses significantly less
bandwidth as compared to G.711 and gives better quality as
compared to G.723.
The Jitter Buffer monitors network conditions and implements
a delay profiling algorithm that provides better tracking of
adaptive jitter buffer and improves voice quality. The jitter buffer
automatically determines the network jitter, maintains the
desired packet loss rate, subject to the limit of the maximum
allowed jitter delay. These parameters can be configured
here.
The Jitter Buffer Delay specifies the maximum desired jitter
delay in milliseconds. Range: 0 to 500 milliseconds. Default:
150 milliseconds.
Specifies the allowable packet loss rate in 0.1% units. Range:
0 to 50 (corresponding to 0.1 % to 5.0 %). Default: 1 (0.1%).
The volume settings at various levels can be configured here.
Here Tx field specifies stream going from this device to IP
network and Rx specifies the stream coming to this device
from the IP network.
VoIP: Increase this value to digitally amplify the signals.
Range: -40 dB to 15 dB. Default: 0 dB.
PSTN: Increase this value to amplify the signals at analog
level. Range: 0 or 1 (corresponding to 0 and 6 dB). Default: 0.
Tone: Modify this value to set the volume level of tones.
Range: -20 dB to 15 dB. Default: -12 dB.