DCN_rpj16

DCN_rpj16 - NT503 Data Communication Networking Line coding...

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1 Line coding
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2 Signal conversion ¾ Digital-to-digital conversion is the representation of digital information by an encoded digital signal
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3 Line coding ¾ Advantages: ± Avoids DC component ± Clocking ± Error Detection ± Signal Interference and Noise Immunity ¾ Disadvantages: ± Cost and Complexity
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4 Line coding ¾ Three categories of digital-to-digital encoding: ± Uni-polar ± Polar ± Bipolar
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5 Unipolar ¾ Uses only one level of amplitude ¾ It’s very simple, but very primitive
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6 Unipolar encoding ± Two Problems: ¾ DC component: ² Average amplitude of encoded signal is nonzero. ² Can not travel through media which can not handle DC components. ¾ Synchronization ² Lack of synchronization between sender and receiver clock can distort the timing of the signal. ² Results in misinterpretation of the number of 1’s or 0’s whenever the data stream include a long uninterrupted series of 1’s or 0’s.
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7 Polar encoding ± Uses two levels (positive and negative) of amplitude ± Reduces the DC component problem ± Three popular variations:
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8 NRZ encoding ¾ Nonreturn to zero (NRZ) ± The signal level is always either positive or negative. ¾
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This note was uploaded on 07/15/2011 for the course ECO 2023 taught by Professor Mr.raza during the Summer '10 term at FAU.