1. Analog Signal: is in form of a wave signal (Frequency). Hz = 1 frequency per second.
2. Digital Signal: Converts analog signal into digital (bits).
a. ADC Analog – to – Digital Converter (Microphone).
b. DAC Digital – to – Analog Converter (Speaker).
File = Byte Format, Data Transactions = Bit Format.
3. Baseband vs. Broadband.
a. Baseband = One Type of Signal.
b. Broadband = Sends/receive multiple different signals at a time. TV Cable (RG6).
4. Modulation: Embedding data signal into a carrier signal. (e.g. Power Signal).
De-modulation: is the process of separating data signal from the carrier signal.
Modem = Modulator/ Demodulator.
5. Multiplexer (MUX): Is a device that generates a single output from multiple inputs.
a. DEMUX: Divides a single signal into multiple signals.
6. Types of Muxes:
a. Frequency division Multiplexing (FDM) (e.g. Radio).
i. FDM: divides frequency band into multiple smaller bands of frequencies. (e.g.
b. Statistical division multiplexing. also called statistical time division Mux(STDM).
CPU assigns time slots to apps (fixed). Generates a sense of mu