data and signal computer networks.pptx

cn notes

1. Data and Signal

2. Analog signal and Digital Signal

3. Data Vs Signal

4. Encoders

5. Digital data and digital signal

6. Digital data digital signal

7. B8ZS : Bipolar 8 zeroes substitution If an octet of all zeros occurs and the last voltage pulse preceding this octet was positive, then the eight zeros of the octet are encoded as 000 + - - + . If an octet of all zeros occurs and the last voltage pulse preceding this octet was negative, then the eight zeros of the octet are encoded as 000 - + + - .

8. HDB3 : high-density bipolar-3 zeros

9. HDB3

10. Digital Data and Analog Signal

11. QAM

12. Analog data and Digital Signal PCM : Pulse Code Modulation

13. Analog data and Digital Signal Delta Modulation