What are Controllerless Modem and Software Modem?
In general, a modem system can be divided into three parts: • Controller: This part communicates with the CPU via the bus (PCI or ISA) interface, executes modem AT command sets, handles data access between applications and datapump, and also executes the error correction and data compression algorithms. • Data Pump: This part handles floating point operations like FFT, DTMF, and other tone generation and detection, modulation and demodulation and spectrum analysis. This part is the engine of the modem, the kernel of modem operation. It modulates data from the controller and transmits the analog signals to the DAA. It demodulates the received signals from the DAA and sends the data to the controller. • DAA ( Data Access Arrangement ): DAA (Data Access Arrangement): This part contains analog circuits to provide the characteristics required to connect to the telephone network. The matching characteristics include line impedance, current sink and hybrid circuitry. The DAA also enables feat
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