Service Number of Ports Load (Busy Ratio %) DSP Cost
*1
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
*1
Trunk using G.729 codec 8 50% 8.8
Trunk using G.711 codec 64 80% 51.2
Extension using G.729 codec 32 50% 35.2
Extension using G.711 codec 64 80% 51.2
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 188.8
*1
DSP Cost = Number of Ports ´ Resource cost per port (unit) ´ Load
In
this example, the total DSP cost is 188.8. In such an environment, a PBX with a DSP L card (max. 254 DSP
resources) would be sufficient.
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.
PC Programming Manual References
9.38 PBX Configuration—[1-5] Configuration—DSP Resource
538 Feature Guide
5.5.4 DSP Resource Usage
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