5.5.4 DSP Resource Usage
Description
To digitally process audio signals, such as a telephone call, the PBX must use a certain number of DSP (Digital
Signal Processing) resources. DSP resources are provided by the DSP card installed in the PBX. Since there
are a limited number of DSP resources, no further operations (e.g., telephone calls, playing an OGM) can be
performed if all resources are being used.
The following list shows some of the basic operations that require DSP resources.
•
IP extension call
•
IP trunk call
•
Conference
•
Accessing the Unified Messaging system (including recording calls)
•
OGM playback
•
Echo canceller
For IP extension and trunk calls, the number of required resources differs depending on the codec (G.711 or
G.729) used.
Note
The examples in this section are intended to illustrate the concept of DSP resource usage. More complex
situations may necessitate additional resources, and in some cases fewer resources may be necessary.
Examples of DSP resource usage
Fundamentally, the number of resources required for a given situation is the sum of the resources required for
each individual operation. The following examples illustrate DSP resource usage in various situations.
[IP trunk to IP extension]
IP Trunk
IP-PT
X
Y
PBX
G.729A
G.711
If an IP trunk call using the G.729 codec requires X number of resources, and an IP extension call using the
G.711 codec requires Y number of resources, then the number of resources required for a call from an IP
extension to an IP trunk requires X + Y number of resources.
[Unified Messaging access]
IP-PT
Y
X
PBX
G.711
UM
Playing back messages from or recording messages to the Unified Messaging (UM in the figure above) system
requires DSP resources, X in this example, in addition to the resources required for the G.711 codec (Y). The
total cost is X + Y.
Feature Guide
531
5.5.4 DSP Resource Usage
Содержание KX-NS500
Страница 14: ...14 Feature Guide Table of Contents...
Страница 15: ...Section 1 For Your Safety Feature Guide 15...
Страница 18: ...18 Feature Guide 1 1 1 For Your Safety...
Страница 19: ...Section 2 Call Handling Features Feature Guide 19...
Страница 40: ...PT Programming Manual References 720 Doorphone Call Destination 40 Feature Guide 2 1 2 Internal Call Features...
Страница 57: ...632 Maximum Number of Agents Feature Guide 57 2 2 2 Incoming Call Distribution Group Features...
Страница 107: ...User Manual References 1 2 1 Basic Calling Feature Guide 107 2 5 4 Trunk Call Features...
Страница 174: ...Feature Guide References 2 21 2 Flexible Buttons 174 Feature Guide 2 11 6 Flash Recall Terminate...
Страница 193: ...User Manual References 1 4 2 Holding a Call Feature Guide 193 2 13 1 Call Hold...
Страница 228: ...User Manual References 1 7 1 Paging 1 7 2 Answering Denying a Paging Announcement 228 Feature Guide 2 17 1 Paging...
Страница 321: ...2 1 4 Turning on the External Background Music BGM Feature Guide 321 2 30 1 Background Music BGM...
Страница 324: ...324 Feature Guide 2 30 2 Outgoing Message OGM...
Страница 325: ...Section 3 Unified Messaging System Feature Guide 325...
Страница 375: ...Section 4 Network Features Feature Guide 375...
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Страница 465: ...Section 5 System Configuration and Administration Features Feature Guide 465...
Страница 506: ...Feature Guide References 6 1 Capacity of System Resources 506 Feature Guide 5 2 4 Portable Station PS Features...
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