Figure 50 Two Calls On A Half Duplex Link With Silence Compression - Nortel VoIP Gateway Configuration Manual

The effect of silence compression on half-duplex links is, therefore, to reduce the peak and average
bandwidth requirements by approximately 50% of the full transmission rate. Because the sender
and receiver are sharing the same bandwidth, this affect can be aggregated for a number of calls.
The following figure shows the peak bandwidth requirements for two calls on a half-duplex link
with silence compression enabled. The peak bandwidth for all calls is equal to the sum of the peak
bandwidth for each individual call. In this case, that is twice the full transmission rate for the two
calls.

Figure 50 Two calls on a half duplex link with silence compression

Conversation
Conversations
Tx Tx Tx
Rx
Rx Rx
Hola Isabella
Hola Isabella! Hola Isabella!
Tx
Tx Tx
Rx
Rx Rx
Fred here.
Fred Here. Fred Here.
Conversation
Bandwidth Used
Bandwidth used
Buenos noches Juan
Buenos noches Juan. Buenos noches Juan.
Hello Fred. This is Susan.
Hello Fred. This is Susan. Hello Fred. This is Susan.
Peek channel bandwidth is
Peak channel bandwidth is n * average
n * average bandwidth per call.
bandwidth per call.
Silence Compression on Half Duplex Links
Muy bien, y tu?
Com o estas?
Como estas? Como estas?
Do you have a minute?
Do you have a minute? Do you have a minute?
Hi!
Hi! Hi!
Channel/Link max
Bandwidth shared by
Bandwidth shared by half-duplex calls
"half-duplex" calls.
Norstar VoIP Gateway Configuration Guide
Muy bien, y tu? Muy bien, y tu?
Sure!
Sure! Sure!
Channel/Link Max
Time
Time ->
169