Time and frequency domain concepts, Fourier Transform. Introduction to Analogy and digital signals.  A/D conversion, Nyquist sampling and quantization. Introduction to modulation and demodulation. Amplitude modulation, frequency modulation and phase modulation. ON-OFF keying, FSK and PSK. Binary codes for transmission (NRZ, RZ, HDB3, Manchester code), delta modulation. Serial and parallel communication, RS232. Modems.