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lec-40 - What's Next Physical layer Data Communication...

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25 Nov 2008  BITS C481 (Computer Networks) 1 What’s Next… Physical layer Data Communication basics Data Rate Limits Shannon Capacity Nyquist bit rate
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25 Nov 2008  BITS C481 (Computer Networks) 2 Data : Analog or Digital Analog data as analog signal : Human voice from our houses to the telephone exchange. Analog data as digital signal : most of the systems today : Say Human voice, images sent on digital lines .. New telephone system (digital exchanges) Digital data as analog signal : computer data sent over internet using analog line .. Say telephone line ( say our house to the exchange) Digital data as digital signal : say from one digital exchange to another
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25 Nov 2008  BITS C481 (Computer Networks) 3 Signals : Analog or digital Analog signal has infinitely many levels of intensity (infinitely many values, continuous values) over a period of time. Digital signal has only a limited number of defined values(discrete values) say, 0,1.
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25 Nov 2008  BITS C481 (Computer Networks) 4 Periodic and Aperiodic Signals Periodic Signals: Repeats over time i.e follows a pattern Ex. Sinewave Aperiodic Signals: No pattern What is used for data communication???
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