RTS XCP-48-RJ45 Manuel d'utilisateur télécharger pdf (Page 79)

Codec Specifications

Figure 5. Codec Specifications

Coding Profile

Codec

Codec Rate

Audio (ms) / Packet

Packets/Second

Encoded Audio (bytes)

IP Overhead (bytes)

Total Packet Size (bytes)

Bandwidth (Bytes/sec)

Bandwidth (kbps/side)

Bandwidth (kbps/channel)

0,3,6,9 G.711 64k 10 100.00 80 60 140 14000 112 224

1,4,7,10 G.711 64k 20 50.00 160 60 220 11000 88 176

2,5,8,11 G.711 64k 30 33.33 240 60 300 10000 80 160

12,16 G.729 8k 10 100.00 10 60 70 7000 56 112

13,17 G.729 8k 20 50.00 20 60 80 4000 32 64

14,18 G.729 8k 40 25.00 40 60 100 2500 20 40

15,19 G.729 8k 60 16.67 60 60 120 2000 16 32

20,22 G.723 5.3k 30 33.33 24 60 84 2800 22.4 44.8

24,26 G.723 6.3k 30 33.33 24 60 84 2800 22.4 44.8

21,23 G.723 5.3k 60 16.67 48 60 108 1800 14.4 28.8

25,27 G.723 6.3k 60 16.67 48 60 108 1800 14.4 28.8

NOTE: A channel consists of a transmitting and a receiving side, so the bandwidth is double for a bi-directional

audio stream.

NOTE: Bandwidth values are approximate maximums, actual bandwidth could be considerably lower with VAD

enabled.

Codec: Determines how the audio is compressed/decompressed and the name given to

the defined algorithm

Coded Rate Actual bits per second of the audio in compressed form. This is sent over the

network through various data packets. Network efficiency can be calculated

with an IP header for each packet of X ms of audio.

Size: Amount of audio in each IP Packet, milliseconds (ms).

VAD: Voice Activity Detection, when enabled and only when audio is above a

certain threshold, will send packets. Otherwise, a silence packet is went once,

and not again until audio is above the threshold. Enabling this will result in a

more efficient network, but care must be taken because of the Mother’s Day

phenomenon. If there is ever a need to have all audio paths open and active, a

network designer must account for this scenario.

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RTS XCP-48-RJ45 Manuel d'utilisateur Page 79