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The network bit rate of SILK is adaptive within the range that the following table specifies. The 

Spacevars
0 product

defines and modifies the average network bit rate in real-time, while the actual bit rate depends on the input signal and change over time. The bit rate can dynamically change within that range. Since all other parameters are equal, the higher bit rates result in higher audio quality.

Caption
0 Table 1 SILK Bandwidth Options 3 silk_bandwidth
Audio Bandwidth Frequency (Hz) Bit Rate (KBPS) Description Narrowband 8000 6 - 20 The  Spacevars 0 product only uses the narrowband mode either to interface to PSTN networks, or on low-end devices that support 8000 Hz or less sampling frequency. Wideband 16,000 8 - 30 The  Spacevars 0 product uses the wideband mode for all IP platforms that support 16,000 Hz or less sampling frequency.

The following table outlines the SBC 1000/2000 SILK performance capacity.

Caption
0 Table 1 SBC 1K/2K SILK Performance Capacity
Configuration (post-Release 6.1.x) Example SKU(s) Number of DSPs Number of Sessions, SILK NB <-> G.711 SBC 1000, SIP entry model SBC-1K-R-SIP-E 1 14 SBC 1000, SIP SBC-1K-R-SIP 3 42 SBC 1000 with PRI SBC-1K-R-FXS8FXO-P, SBC-1K-R-P 2 28 SBC 1000 with FXx, no PRI SBC-1K-R-FXSFXO, SBC-1K-R-FXS 1 14 SBC 1000 gateways SBC-1K-R-4P-FXSFXO-GW 1 14 SBC 2000, 1 DSP SBC-2K-R-1 1 60 SBC 2000, 2 DSP SBC-2K-R-2 2 120 SBC 2000, 4 DSP SBC-2K-R-4 4 240 SBC 2000, 6 DSP SBC-2K-R-6 6 360