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Line Coding Schemes

Line Coding Schemes. ‏ Line coding is the process of converting binary data, a sequence of bits to a digital signal. Course Name: Data Communications Level : UG. Authors Phani Swathi Chitta Mentor Prof. Saravanan Vijayakumaran. Learning Objectives.

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Line Coding Schemes

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  1. Line Coding Schemes ‏Line coding is the process of converting binary data, a sequence of bits to a digital signal. Course Name: Data Communications Level : UG Authors Phani Swathi Chitta Mentor Prof. Saravanan Vijayakumaran

  2. Learning Objectives After interacting with this Learning Object, the learner will be able to: • Convert the sequence of binary digits into a digital signal

  3. Definitions of the components/Keywords: 1 Binary data can be transmitted using a number of different types of pulses. The choice of a particular pair of pulses to represent the symbols 1 and 0 is called Line Coding. 2 3 4 5

  4. Master Layout 1 Input Data 0 1 1 0 1 1 1 0 1 0 1 2 3 Digital Signal 4 5

  5. Step 1: unipolar NRZ (Non Return to Zero) 1 Representation of 0 Representation of 1 2 3 4 5

  6. Step 2: Polar NRZ (Non Return to Zero) 1 Representation of 0 Representation of 1 2 3 4 5

  7. Step 3: Polar RZ (Return to Zero) 1 Representation of 0 Representation of 1 2 3 4 5

  8. Step 4: NRZI (Non Return to Zero Inverted) 1 Representation of 0 Representation of 1 2 Fig. A Fig. B Fig. C Fig. D 3 4 5

  9. Step 5: Manchester coding 1 Representation of 0 Representation of 1 2 3 4 5

  10. Step 6: Differential Manchester coding 1 Representation of 0 Representation of 1 2 Fig. A Fig. B Fig. C Fig. D 3 4 5

  11. The corresponding waveforms should be shown in the demo part when a particular line code is selected.

  12. Illustration of different line coding schemes

  13. Assumption: The signal level to the left of the bit is high • Include Slides 13 and 14 in the theory part

  14. Electrical Engineering Slide 1 Slide 3 Slide 14,15 Slide 17 Slide 16 Introduction Definitions Analogy Test your understanding (questionnaire)‏ Lets Sum up (summary)‏ Want to know more… (Further Reading)‏ Interactivity: Input Data Try it yourself • Select the coding scheme • Uni polar NRZ • Polar NRZ • Polar RZ • NRZI • Manchester • Differential Manchester Digital Signal • Enter 11 bit input data 15 Credits

  15. Questionnaire 1 • What is the Differential Manchester waveform corresponding to the bit string 1101101 Note: The signal level before the first bit is assumed to be high Answers: a) b) ‏ 2 3 4 5

  16. Questionnaire 1 2. What is the Differential Manchester waveform for the bit string 11100 Note: The signal level to the left of the first bit in the string is low Answers: a) b) ‏ 2 1 1 1 0 0 3 4 5

  17. Links for further reading Reference websites: Books:“Communication Systems” by Simon Haykin, fourth Edition “Data and Computer Communications” by William Stallings, eighth Edition Research papers:

  18. Summary • Binary data can be transmitted using a number of different types of pulses. The choice of a particular pair of pulses to represent the symbols 1 and 0 is called Line Coding. • ‏Line coding is the process of converting binary data, a sequence of bits to a digital signal.

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