1. Presentation on Line coding technique Given by Mithun Majumdar IT/14/40

2. Line encoding technique Introduction Characteristics of line coding technique 1. signal level versus data level 2. pulse rate versus bit rate: e.g, signal has two data level and pulse duration of 10ms 3. DC component: 4. Self-synchronization

3. Line encoding technique Schema of line coding technique Line coding UnipolarPolarBipolar

4. Line encoding technique Unipolar: >Two voltage level is used >positive for 1 >zero level for binary 0 Disadvantage: 1.Dc component problem 2.Long stream of 0’s and 1’s 3.Average voltage line is positive

5. Line encoding technique Polar: Overcoming from disadvantage of unipolar Classification of polar Polar NRZRZManchestar Differential manchester

6. Line encoding technique NRZ: 1.Use either positive or negative voltage Classification of NRZ: NRZNRZ-LNRZ-I

7. Line encoding technique NRZ-L(Non return zero-level): >Positive level binary 0 >Negative level binary 1 Disadvantage: 1.Long stream of 1’s and 0’s

8. Line encoding technique NRZ-I(Non return zero-invert) >.Inversion of voltage level represent one bit >Transition between positive and negative represent binary 1 and no change in voltage level is binary 0 Disadvantage: 1.Only Long stream of 0’s can’t understand by receiver.1’s can

9. Line encoding technique RZ(Return to zero): >Three voltage level >Positive to zero 1 >Negative to zero 0 Disadvantage: 1.Two signal change for one bit 2.Occupied more bandwidth

10. Line encoding technique Manchester: >Use inversion at middle of bit interval for both synchronization and bit representation >Positive to negative 0 >Negative to positive 1

11. Line encoding technique Differential Manchester:  Uses Inversion at middle of bit interval for synchronization  Presence or absence of an additional transition at the beginning of the interval is used to indentify  Transition means 0 and no transition means 1

12. Line encoding technique Bipolar: >Three voltage level >Zero state for 0 >1 st 1 is positive and 2 nd is negative and 3 rd is positive and so on

13. Line encoding technique THANK YOU SO MUCH Have a great day