SBC 7000 DSP Densities

Overview

This section describes DSP density values on the SBC 7000 system according to its DSP module configuration.

Media handling functionality of SBC 7000 platform is identical to SBC 5000 series platform with DSP25 modules. All the functional specifications of SBC 7000 platform are similar to the SBC 5000 series platform with the exception of transcode operation capacities. Announcements and DTMF detection do not require additional resources beyond the DSP PAD required for transcoding.

A four DSP module configuration contains ample capacity to transcode the following calls over the two 10 Gigabit media interfaces:

• G.711 to G.711
• G.711SS to G.711SS
• G.722 to G.711

The number of calls supported by the two 10 Gigabit media interfaces depends upon the packet size of those calls. For example, when transcoding either 20 ms G.711 to 20 ms G.711 or 20 ms G.722 to 20 ms G.711, the media interfaces support approximately 99,000 calls.

For the G.711 SS case, when transcoding 20 ms G.711SS to 20 ms G.711SS, the system can support up to 150,000 calls, the maximum number allowable on the  SBC 7000 platform. This scenario is not limited by DSP capacity or system bandwidth.

For G.722, a four DSP module configuration contains enough DSP transcoding capability to perform 123648 G.722 to G.711 transcodes.  However, the system does not have enough bandwidth to transcode that many sessions.  Assuming a 20 ms packet size, the two 10 gigabit interfaces allow transcoding of approximately 99,000 G.722 to G.711 calls.

The SBC 7000 system can support the following capacities when fully populated with four DSP-LCs:

SBC 7000 with One DSP-LC

The following table depicts the maximum number of sessions between two codec types on an SBC 7000 with one DSP-LC module installed. An SBC 7000 can be configured with up to four DSP-LC modules.