1. DATA COMMUNICATION
Lecture-15

2. Recap of Lecture 14 Introduction to the Encoding Techniques
Digital-To-Digital Encoding
Types of Digital-To-Digital Encoding
UniPolar Encoding
Polar Encoding
NRZ

3. Overview of Lecture 15 Types of Digital-To-Digital Encoding
Polar Encoding
Return to Zero (RZ) Encoding
Biphase Encoding
Bipolar Encoding

4. Conversion Methods

5. Types of Digital-to-Digital Encoding
Digital/Digital Encoding
Unipolar
Polar
Bipolar

6. Types of Polar Encoding

7. Return to Zero (RZ)

8. Biphase Encoding
Best existing solution to the problem of Synchronization
Signal changes at the middle of bit interval but does not stop at zero

9. Differential Manchester
Biphase Encoding
Biphase Encoding
Differential Manchester
Manchester

10. Manchester

11. Differential Manchester

12. Bipolar Encoding Like RZ, it uses three voltage levels:
Unlike RZ, zero level is used to represent binary 0
Binary 1’s are represented by alternate positive and negative voltages

13. Bipolar Encoding

14. Alternate Mark Inversion (AMI)
Simplest type of Bipolar Encoding
Mark  Comes from Telegraphy (1)
Alternate Mark Inversion means Alternate ‘1’ Inversion

15. Alternate Mark Inversion (AMI)

16. Bipolar 8 Zeros Substitution (B8ZS)

17. High Density Bipolar 3 (HDB3)

18. Summary Types of Digital-To-Digital Encoding Polar Encoding
Return to Zero (RZ) Encoding
Biphase Encoding
Bipolar Encoding

19. Suggested Reading
Section 5.1, “Data Communications and Networking” 2nd Edition by Behrouz A. Forouzan