NEC Univerge SV9100 Manual page 211

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5-16
Bandwidth Calculation
( [ Layer 2 overhead + IP/UDP/RTP header + Voice Payload ] / Voice
Payload ) * Default CODEC speed = Total Bandwidth
Example of a G.711 call over Ethernet using a 20 ms packet size and not
using RTP header compression
(.020 * 64000) / 8 = 160 Bytes for Voice Payload
( [ 18 + 40 + 160] / 160 ) * 64000 = 87200 bps
If VAD is not enabled, each side of the conversation would be streaming
87.2 Kbps in one direction for a total of 174.4 kbps.
Below is a chart showing the supported CODECs, with a few different
packet sizes over PPP and Ethernet.
CODEC
Packet Size
G.711
G.711
G.711
G.711
G.722
G.722
G.722
G.722
G.729
G.729
G.729
G.729
G.729
G.729
G.726
G.726
PPP
10
103.2 kbps
20
83.6 kbps
30
77.1 kbps
40
73.9 kbps
10
103.2 kbps
20
83.6 kbps
30
77.1 kbps
40
73.9 kbps
10
47.2 kbps
20
27.6 kbps
30
21.1 kbps
40
17.8 kbps
50
15.9 kbps
60
14.5 kbps
10
71.2 kbps
20
51.6 kbps
Issue 2.0
Ethernet
110.4 kbps
87.2 kbps
79.5 kbps
75.6 kbps
110.4 kbps
87.2 kbps
79.5 kbps
75.6 kbps
54.4 kbps
31.2 kbps
23.5 kbps
19.6 kbps
17.3 kbps
15.7 kbps
78.4 kbps
55.2 kbps
SV9100 IP K-CCIS

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