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The new generation Cisco FXO/FXS NIMs, add improvements over the previous WAN Interface Cards (VICs and VIC2s). The FXO, FXS, E/M and BRI NIMs contain an onboard DSP (Digital Signal Processor) and don’t require the router to have dedicated PVDM on the motherboard. The DSP on the voice module is necessary for the voice features. It also provides for echo cancellation of up to 128-ms echo-tail length for demanding network conditions.