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22 Network Design and Engineering Guide 2010-10-26
General Carrier Design
Data and Voice Networking Overview
Voice Codecs
The following tables specify the required data rate per call and direction for both VoIP and
VoFR calls using the most popular voice codecs. For the user traffic estimation use the tables
below:
-
For VoIP connections: use columns ’IP Bit rate w/o ROHC’ or ’ROHC Bit rate’ of table 2-1.
- For VoFR connections: use columns ’IDU Input Data Rate’ of table 2-2.
The columns labelled ’incl. SLL encapsulation’ provide an estimation for the data requirements
including SLL encapsulation.
Table 2-1 IP Voice Call Data Rates
Table 2-2 Frame Relay Voice Call Data Rates
Codec Codec
Bit Rate
[bps]
Voice
Payload
[byte}
Bit Rate
Ethernet
[bps]
IP Bit
Rate w/o
RoHC
[bps]
IP Bit
Rate
(incl. SLL
encaps.)
[bps] RoHC Bit
Rate
[bps]
RoHC Bit
Rate
(incl. SLL
encaps.)
[bps]
G.711 64,000 160 87,200 80,000 83,200 65,600 68,800
G.722 32,000 80 55,200 48,000 51,200 33,600 36,800
G.723 6,300 24 21,525 16,773 18,885 7,269 9,381
G.728 16,000 60 31,466 26,714 28,826 17,210 19,322
G.729 8,000 20 31,200 24,000 27,200 9,600 12,800
Codec IDU Input Data
Rate
[bps] Frame
Time
[ms] Voice Payload
[byte]
Data Rate (incl.
encaps.)
[bps]
ACELP CN 8kx1 12,440 18 20 15,120
ACELP CN 8kx2 10,670 36 40 12,000
ACELP CN 8kx3 9,930 54 59 10,820
ACELP CN 6kx1 10,670 18 16 13,340
ACELP CN 6kx2 8,890 36 32 10,230
ACELP CN 6kx3 8,150 54 47 9,040