Chapter 5 Troubleshooting
204
(see the following table for calculation of maximum bandwidth required)
Network congestion
: a well maintained network flow control policy or protocol
help to control the traffic and prioritize the service for different type of media
Type of voice codec
Network device delay
: firewall, router, switch, access device, … etc all contribute
latency to the traffic. A good network configuration in advance is very important.
Type of the Voice Codec selected is a big factor and tradeoff to the voice quality.
The PCM type codec (G.711 u-law or A-law) provide excellent voice quality, but
consume large amount of network bandwidth. A higher compression rate codec
provide fair voice quality and consumes less network bandwidth, however requires
more CPU/DSP power which increase the voice latency.
Table 5-1
Voice Codec Bandwidth
Codec Types
Bit Rate
ITU-T G.711 A-Law PCM
64K
ITU-T G.711
-Law PCM
64K
ITU-T G.723.1
6.3K/5.3K
ITU-T G.729A
8K
ITU-T G.726.
16/24/32/40K
Summary of Contents for VENUS 2916
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Page 10: ...Venus 29xx Series SIP User s Manual viii APPENDIX C CODE DETERMINATION FLOW CHART 209...
Page 67: ...Chapter 3 Configuration and Management 51 Figure 3 27 Ethernet Configuration...
Page 81: ...Chapter 3 Configuration and Management 65 3 5 3 6 SNMP Figure 3 37 SNMP Configuration...
Page 121: ...Chapter 3 Configuration and Management 105 Figure 3 55 Static Routing Configuration...
Page 124: ...Chapter 3 Configuration and Management 108 Figure 3 57 DHCP Server Configuration...
Page 170: ...Chapter 3 Configuration and Management 154 Figure 3 106 Spy command...
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