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Codec Information
Bandwidth Calculations
Codec & Bit Rate (Kbps)
Codec
Sample
Size
(Bytes)
Codec
Sample
Interval
(ms)
Mean
Opinion
Score
(MOS)
Voice
Payload
Size
(Bytes)
Voice
Payload
Size
(ms)
Packets
Per
Second
(PPS)
Bandwidth
Ethernet
(Kbps)
G.711 (64 Kbps)
80
Bytes
10
ms
4.1
160
Bytes
20
ms
50
87.2
Kbps
G.729 (8 Kbps)
10
Bytes
10
ms
3.92
20
Bytes
20
ms
50
31.2
Kbps
G.722 (64 Kbps)
80
Bytes
10
ms
4.13
160
Bytes
20
ms
50
87.2
Kbps
Explanation of Terms
Codec Bit Rate (Kbps)
Based on the codec, this is the number of bits per second that need to be transmitted to deliver a voice call. (codec bit rate = codec sample size / codec sample interval).
Codec Sample Size (Bytes)
Based on the codec, this is the number of bytes captured by the Digital Signal Processor (DSP) at each codec sample interval. For example, the G.729 coder operates on sample intervals of 10 ms, corresponding to 10 bytes (80 bits) per sample at a bit rate of 8 Kbps. (codec bit rate = codec sample size / codec sample interval).
Codec Sample Interval (ms)
This is the sample interval at which the codec operates. For example, the G.729 coder operates on sample intervals of 10 ms, corresponding to 10 bytes (80 bits) per sample at a bit rate of 8 Kbps. (codec bit rate = codec sample size / codec sample interval).
MOS
MOS is a system of grading the voice quality of telephone connections. With MOS, a wide range of listeners judge the quality of a voice sample on a scale of one (bad) to five (excellent). The scores are averaged to provide the MOS for the codec.
Voice Payload Size (Bytes)
The voice payload size represents the number of bytes (or bits) that are filled into a packet. The voice payload size must be a multiple of the codec sample size. For example, G.729 packets can use 10, 20, 30, 40, 50, or 60 bytes of voice payload size.
Voice Payload Size (ms)
The voice payload size can also be represented in terms of the codec samples. For example, a G.729 voice payload size of 20 ms (two 10 ms codec samples) represents a voice payload of 20 bytes [ (20 bytes * 8) / (20 ms) = 8 Kbps ].
PPS
PPS represents the number of packets that need to be transmitted every second in order to deliver the codec bit rate. For example, for a G.729 call with voice payload size per packet of 20 bytes (160 bits), 50 packets need to be transmitted every second [50 pps = (8 Kbps) / (160 bits per packet) ].