CITM301 Chapter 3 - CITM301 Chapter 3 TRANSMISSION BASICS AND NETWORKING MEDIA TRANSMISSION process of transmitting or of signals after they have been

CITM301 Chapter 3 - CITM301 Chapter 3 TRANSMISSION BASICS...

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  • CITM 301
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CITM301 Chapter 3 TRANSMISSION BASICS AND NETWORKING MEDIA TRANSMISSION : process of transmitting or of signals after they have been transmitted Types of Signaling ANALOG : voltage varies continuously and appears as a wavy line when graphed over time o AMPLITUDE : measure of its strength at any given point in time o FREQUENCY : number of times that a wave’s amp cycles from it’s starting point (Hz) o WAVELENGTH : the distance between corresponding points on wave’s cycle o Convey greater subtleties with less energy DIGITAL : composed of pules of precise, positive and zero voltages (1) o Binary system (bit) o 8 bits form a byte (placeholders are from right to left starting with 0) DATA MODULATION : technology used to modify analog signals to make them suitable for carrying data over a communication path SIMPLEX : signal travelling in only one direction HALF-DUPLEX : signals may travel in both directions over a medium but in only one direction at a time FULL-DUPLEX : signals are free to travel in both directions over a medium simultaneously (eg. Talking on the phone; 300-3400 Hz) MULTIPLEXING : form of transmission that allows multiple signals to travel simultaneously over one medium o MUX (MULTIPLEXER) : device that can combine many signals on a channel o DEMUX (DEMULTIPLEXER) : separates the combined signals and brings them back to the original form o TDM (TIME DIVISION MULTIPLEXING) : divides a channel into multiple intervals of time or time slots) o STATISTICAL MULTIPLEXING : transmitter assigns slots to nodes according to priority and need o FDM (FREQUENCY DIVISION MULTIPLEXING)
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  • Summer '19
  • Twisted pair, Coaxial cable, division multiplexing, wire pairs, multiple light signals

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