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Chapter 4

Chapter 4. Digital Transmission. Figure 4.1 Line coding. Figure 4.2 Signal level versus data level. Figure 4.3 DC component. Figure 4.4 Lack of synchronization. Figure 4.5 Line coding schemes. Note:. Unipolar encoding uses only one voltage level. Figure 4.6 Unipolar encoding. Note:.

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Chapter 4

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  1. Chapter 4 DigitalTransmission

  2. Figure 4.1Line coding

  3. Figure 4.2Signal level versus data level

  4. Figure 4.3DC component

  5. Figure 4.4Lack of synchronization

  6. Figure 4.5Line coding schemes

  7. Note: Unipolar encoding uses only one voltage level.

  8. Figure 4.6Unipolar encoding

  9. Note: Polar encoding uses two voltage levels (positive and negative).

  10. Figure 4.7Types of polar encoding

  11. Note: In NRZ-L the level of the signal is dependent upon the state of the bit.

  12. Note: In NRZ-I the signal is inverted if a 1 is encountered.

  13. Figure 4.8NRZ-L and NRZ-I encoding

  14. Figure 4.9RZ encoding

  15. Note: A good encoded digital signal must contain a provision for synchronization.

  16. Figure 4.10Manchester encoding

  17. Note: In Manchester encoding, the transition at the middle of the bit is used for both synchronization and bit representation.

  18. Figure 4.11Differential Manchester encoding

  19. Note: In differential Manchester encoding, the transition at the middle of the bit is used only for synchronization. The bit representation is defined by the inversion or noninversion at the beginning of the bit.

  20. 4.4 Transmission Mode Parallel Transmission Serial Transmission

  21. Figure 4.24Data transmission

  22. Figure 4.25Parallel transmission

  23. Figure 4.26Serial transmission

  24. Note: In asynchronous transmission, we send 1 start bit (0) at the beginning and 1 or more stop bits (1s) at the end of each byte. There may be a gap between each byte.

  25. Note: Asynchronous here means “asynchronous at the byte level,” but the bits are still synchronized; their durations are the same.

  26. Figure 4.27Asynchronous transmission

  27. Note: In synchronous transmission, we send bits one after another without start/stop bits or gaps. It is the responsibility of the receiver to group the bits.

  28. Figure 4.28Synchronous transmission

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