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Computer Networks

  • Computer Network - CN
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Shubham Kumar
Shubham Kumar
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B8ZS AND HDB3(SCRAMBLING)TUTORIAL-1 BY-SHUBHAM KUMAR

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HDB3(SCRAMBLING)TUTORIAL-2 BY-SHUBHAM KUMAR

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HDB3(SCRAMBLING)TUTORIAL-3 BY-SHUBHAM KUMAR

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SCRAMBLING  As we know we are using various digital encoding techniques like- Line Coding, Block Coding and Scrambling in order to enhance synchronization between the transmitter and the receiver.  In digital systems, it is common to encounter long sequences of zeros (0’s) and one’s (1’s), which makes it difficult for the receiver to retrieve timing information.  Scrambling is a digital encoding technique that is used to remove the long sequences of zeros (0’s) in a given data sequence.  By using Scrambling, we can enhance the synchronization by randomizing the bit sequence. Note: Before we start, it will be good to have a prior knowledge about AMI (Alternate Mark Inversion) Line Encoding Technique. AMI (Alternate Mark Inversion)  The AMI is a bipolar encoding technique where zero (0) voltage represents the binary 0 and alternating positive and negative voltages represent binary 1.  Let us take an example to understand the working of AMI: We are given with a bit sequence as – 10100111001 After using the AMI encoding, we have: 1 0 0 1 0 1 1 1 0 0 1

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