VTEL HS 2000, Руководство системного администратора

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HS 2000 System Administrator’s Handbook Chapter 4. Monitoring System Operation
System Status 77
Audio Send
The current bandwidth used for sending audio. These are the audio
compression algorithms:
Audio compression algorithms
Algorithm Description
16 Kbps, G.728 This is a low bit-rate algorithm. It consumes only
16 Kbps of a call. Its best use is for low bit-rate
calls, especially 128 Kbps or lower, or ISDN calls.
The audio bandwidth is 3.4 KHz and the audio
quality is good. This is a standards-based
algorithm, but it may not be available on some
non-VTEL systems.
48 Kbps, G.722 This algorithm uses 48 Kbps of bandwidth and
provides better audio quality than G.711 and
G.728 at lower (for example, 128 Kbps)
transmission rates. The audio bandwidth is 7.0
KHz, and the audio clarity is about twice that of a
standard telephone.
56 Kbps, G.722 This algorithm uses 56 Kbps of bandwidth and
provides better audio quality than G.711 and
G.728 at lower (for example, 128 Kbps)
transmission rates. The audio bandwidth is 7.0
KHz, and the audio clarity is about twice that of a
standard telephone.
64 Kbps, G.711 µlaw Uses 64 Kbps of the video call. This algorithm
is used when the video call bandwidth is large
(greater than 128 Kbps) or when the receiving
end is not capable of G.728 or G.722.
The audio bandwidth for G.711 µlaw is 3.4 KHz.
This algorithm is predominant in the USA.
G.711 Alaw is for use in Europe.
64 Kbps, G.711 Alaw G.711 Alaw characteristics are the same as G.711
µlaw. G.711 Alaw is primarily for use in Europe.