06-DigitalDataComm

06-DigitalDataComm - William Stallings Data and Computer...

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William Stallings Data and Computer Communications 8th Edition Chapter 6 Digital Data Communications Techniques
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Each signaling element may contain: less than one bit…. Manchester encoding One bit….NRZ-L, FSK More than one bit….QPSK However the bits are encoded, the sender and receiver  must synchronize in order to transfer the bits  correctly.
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Asynchronous and Synchronous Transmission Timing problems require a mechanism to  synchronize the transmitter and receiver Two solutions Asynchronous Synchronous
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Asynchronous Data transmitted on character at a time 5 to 8 bits Timing only needs maintaining within each  character Resynchronize with each character
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Asynchronous (diagram)
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Asynchronous - Behavior In a steady stream, interval between characters  is uniform (length of stop element) In idle state, receiver looks for transition 1 to 0 Then samples next seven intervals (char length) Then looks for next 1 to 0 for next char Simple Cheap Overhead of 2 or 3 bits per char (~20%) Good for data with large gaps (keyboard)
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This note was uploaded on 02/10/2012 for the course CSC 411 taught by Professor Simmons during the Spring '08 term at S. Alabama.

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06-DigitalDataComm - William Stallings Data and Computer...

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