92
Voice over IP (VoIP)
Fundamentals
The following table provides an overview of the required bandwidth for a telephone connection with various
parameter settings. The values apply to half-duplex ethernet; for full-duplex the values can be halved.
Voice Quality
The achievable voice quality depends on various factors. It is possible to optimise voice-data transmission on
an existing network using the available configuration settings. Measuring the network quality may also help.
The following comparison provides a guide to voice quality with specific quality levels:
Required bandwidth (kilobit/s) with respect to Packet Length and Codec
Packet Length (ms) G.711 (not
compressed)
G.729A
approx. 8 kilobit/s
G.723.1
6.3 kilobit/s
G.723.1
5.3 kilobit/s
20
180.8
68.8
30
51.2
48.0
45.9
40
42.4
50
37.12
60
33.6
30.4
28.3
70
31.09
80
29.2
Quality Levels for Voice Transmission with VoIP
Level
Voice Comprehensibility
Comparable to
1
Very Good
ISDN
2
Good
DECT
3
Satisfactory
GSM
4
Limited
Defective GSM
> 4
Unacceptable
No Connection
Summary of Contents for Comfort Pro S
Page 1: ...Comfort Pro S Mounting and Commissioning Installation Guide...
Page 2: ......
Page 166: ...164 Index Notes...
Page 167: ......