Data Transmission - Computer Science and Engineering
1Data TransmissionPresentation BCSE 3461 / 5461: Computer Networking & Internet TechnologiesKannan Srinivasan08/30/2012Presentation B2Data Communications ModelFigure Assignment: , B3 data : entities that convey meaning analog data : continuous values within some interval sound, video digital data : discrete values text, integers Signals (electromagnetic or electric): means by which data are propagated analog (or contiguous) signalis continuously varying electromagnetic wavethat propagates over (a variety of) medium digital (or discrete) signalis sequence of voltage pulsesthat are transmitted over a wire medium. The signal intensity maintains a constant level for some time and then changes to another constant and SignalsPresentation B4Analog and Digital Signals: ExamplesFigure signalDigital (2-level) signal3Presentation B5Analog Signal Carrying Analog & Digital DataFigure B6Digital Signal Carrying Analog & Digital DataFigure B7 Transmission is communication of data by propagation and processing of signals Transmission system includes: Transmission medium and amplifiers or repeaters Transmission medium guided medium: electromagnetic waves are gu
Data Transmission Presentation B CSE 3461 / 5461: Computer Networking & Internet Technologies Kannan Srinivasan 08/30/2012 Presentation B 2 Data Communications Model ... transmission system for the signal to be efficiently transferred through the given transmission system.
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