*2
Example 1: Small Office
In a small office (e.g., 32 employees), the necessary number of trunks and extensions is likely to be
relatively small. In addition, the expected load on the system will also be small.
(For clarity, unused services are not included in the table.)
Service
Number of Ports
Load (Busy Ratio %)
DSP Cost
Trunk using G.729 codec
3
5%
0.3
Non-IP trunk
1
5%
0.05
Extension using G.729 codec
32
10%
7.0
Unified Messaging
4
—
5.2
OGM
2
—
4.0
Conference
4
—
2.0
Total DSP Cost
18.55
*1
DSP Cost = Number of Ports × Resource cost per port (unit) × Load
In the example above, the total DSP cost is 18.55. In such an environment, a PBX with a DSP S card (max.
63 DSP resources) would be sufficient.
Example 2: Call Centre
In a call centre, both the number of trunks and number of extensions are likely to be very high. Also, since
employees are constantly receiving calls, the system load will be high. Furthermore, calls are often recorded
at call centres to provide quality-of-service monitoring.
Service
Number of Ports
Load (Busy Ratio %)
DSP Cost
Trunk using G.729 codec
8
50%
8.8
Trunk using G.711 codec
128
80%
102.4
Extension using G.729 codec
32
50%
35.2
Extension using G.711 codec
128
80%
102.4
IP-CS using G.729 codec
8
50%
8.8
Unified Messaging
8
—
10.4
Two-way Recording
4
—
9.2
OGM
4
—
8.0
Conference
12
—
6.0
Total DSP Cost
291.2
*1
DSP Cost = Number of Ports × Resource cost per port (unit) × Load
In this example, the total DSP cost is 291.2. In this case, two DSP cards are necessary: at minimum one
DSP L card (max. 254 DSP resources) and one DSP S card (max. 63 DSP resources).
Conditions
•
Calls that are established via P2P (→ 5.2.3 Peer-to-Peer (P2P) Connection) do not use the PBX’s DSP
resources, so they may be excluded from the usage calculation.
5.5.3 DSP Resource Usage
Feature Manual
421
Summary of Contents for KX-NSX1000
Page 8: ...List of Abbreviations 8 Feature Manual ...
Page 16: ...Table of Contents 16 Feature Manual ...
Page 17: ...Section 1 For Your Safety Feature Manual 17 ...
Page 20: ...1 1 1 For Your Safety 20 Feature Manual ...
Page 21: ...Section 2 Call Handling Features Feature Manual 21 ...
Page 260: ...2 29 2 Call Control Feature 260 Feature Manual ...
Page 261: ...Section 3 Unified Messaging System Feature Manual 261 ...
Page 311: ...Section 4 Network Features Feature Manual 311 ...
Page 377: ...Section 5 System Configuration and Administration Features Feature Manual 377 ...