PLANET VIP-350PT User Manual

Page 147

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Packet Rate and VoIP Bandwidth Consumption
Packet rate is especially important for sizing a network against a router because routers are not only

constrained by bandwidth but the number of packets per second (PPS) that they can process.

This table calculates the bandwidth consumption based on uni-directional voice only. So for the total

bandwidth used for media during a simple two-way call, you should multiply the value by two.

Link

CODEC

Frame per

RTP Packet

(Packet Rate)

IP

(kbps)

PPP

(kbps)

Ethernet

802.3

Averaged

Band-width

Utilization

Delay

(ms)

Mean

Opinion

Score

(MOS

i

)

1 (35 pps

ii

) 16.8 18.4 21.6

28%

37.5

2 (17 pps)

11.2

12

13.6

43.2%

67.5

3 (12 pps)

9.3

9.9

10.9

52.8%

97.5

4 (9 pps)

8.4

8.8

9.6

59.3%

127.5

5 (7 pps)

7.8

8.2

8.8

64.1%

157.5

G.723.1

5.3 kbps

6 (6 pps)

7.5

7.7

8.3

67.7%

187.5

3.5-3.7

1 (35 pps)

17.9

19.5

22.7

31.9%

37.5

2 (17 pps)

12.3

13.1

14.7

47.9%

67.5

3 (12 pps)

10.5

11

12.1

57.1%

97.5

4 (9 pps)

9.5

9.9

10.7

63.8%

127.5

5 (7 pps)

9

9.3

9.9

68.1%

157.5

G.723.1

6.4 kbps

6 (6 pps)

8.6

8.9

9.4

71.4%

187.5

3.8-4.0

1 (100 pps)

42

46.8

56.4

16.5%

15

2 (50 pps)

25.2

27.6

32.4

28.2%

25

3 (35 pps)

19.6

21.2

24.4

36.8%

35

4 (25 pps)

16.8

18

20.4

43.5%

45

5 (20 pps)

15.1

16.1

18

48.8%

55

G.729ab

8 kbps

6 (17 pps)

14

14.8

16.4

53.1%

65

3.7-4.2

1 (100 pps)

64

73.6

75.2

43%

10

2 (50 pps)

48

52.8

53.6

60.2%

20

3 (35 pps)

44.8

48.2

48.7

66%

30

4 (25 pps)

40

42.4

42.8

75.1%

40

5 (20 pps)

38.4 40.3 40.6 79.11%

50

G.726

32 kbps

6 (17 pps)

38.1

39.7

40

80.3

60

4.1

1 (100 pps)

100.8

105.6

115.2

59.9%

10

2 (50 pps)

84

86.4

91.2

73.4%

20

3 (33 pps)

78.4

80

83.2

79.5%

30

4 (25 pps)

75.6

76.8

79.2

82.9%

40

5 (20 pps)

73.9

74.9

76.8

85.1%

50

G.711

64 kbps

6 (17 pps)

72.8

73.6

75.2

86.6%

60

4.3-4.7

Those values in

blue

font are near optimal settings for the specific CODEC in terms of bandwidth

consumption and delay. In general, the more frames carried in one RTP packet, the less bandwidth it
consumes but in the cost of longer delay. We suggest a good setting should not introduce a delay for
more than 60 ms.

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