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ITM 301 - Notes (Lesson 3)

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Ryerson University
Information Technology Management
ITM 301
Farid Shirazi

Physical 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. Radio stations). b. Statistical division multiplexing.  also called statistical time division Mux(STDM).  CPU assigns time slots to apps (fixed).  Generates a sense of mu
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