
706 Appendix A Silence suppression
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Figure 224 One call on a full-duplex link without silence suppression
When silence suppression is enabled, voice packets are only sent when a speaker is talking. When
a voice is being transmitted, it uses the full-rate transmission rate. Since the sender and receiver do
not share the same channel, the peak bandwidth requirement per channel is still equal to the full
transmission rate. The following figure shows the peak bandwidth requirements for one call on a
full-duplex link with silence suppression enabled. The spare bandwidth made available by silence
suppression is used for lower-priority data applications that can tolerate increased delay and jitter.
Figure 225 One call on a full-duplex link with silence suppression
Conversation
Hello Fred. This is Susan. Do you have a minute?
Fred here. Hi! Sure!
Channel/Link max
Channel/Link max
Conversation
Bandwidth used
Voice frames sent even when speaker is silent
Tx
Rx
Bandwidth Bandwidth
Tx Channel
Rx Channel
Time
Time
Hello Fred. This is Susan. Do you have a minute?
Fred here.
Hi! Sure!
Conversation
Bandwidth used
Channel/Link max
Channel/Link max
Time
Time
Independent Tx and Rx bandwidth not shared by half-duplex calls.
Rx ChannelTx Channel
BandwidthBandwidth
Tx
Rx
Bandwidth available for data apps.
Conversation
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