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Modern Possibilities of Access and Transport Networks

Modern Possibilities of Access and Transport Networks. Vladislav Skorpil. The principle of Time Division Multiplex. The Principle of Pulse Code Modulation (PCM). The Principle of Delta Modulation (DM) and Adaptivre delta Modulation (ADM). Adaptive Diferential PCM - ADPCM.

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Modern Possibilities of Access and Transport Networks

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  1. Modern Possibilities of Access and Transport Networks Vladislav Skorpil

  2. The principle of Time Division Multiplex

  3. The Principle of Pulse Code Modulation (PCM)

  4. The Principle of Delta Modulation (DM) and Adaptivre delta Modulation (ADM)

  5. Adaptive Diferential PCM - ADPCM • For signal with no constant midle power, samples are adapted to constant midle power

  6. The basic block diagram for TDM system with digital modulation • Older type • Common codec

  7. Transmiter part

  8. Receiver part

  9. The basic block diagram for TDM system with digital modulation • Modern type • Individual codec

  10. Quantizing step encoder

  11. Weighting encoder (Bit encoder)

  12. Counting Analogue to Digital Convertor

  13. Tracking A/D Convertor

  14. Parallel A/D Convertor

  15. Compenzating A/D Convertor

  16. Shannon decoder

  17. Shannon decoder response

  18. Shannon Rack decoder

  19. Shannon-Rack Decoder Response

  20. Weighting Decoder (Bit Encoder)

  21. Operational Amplifier

  22. D/A Convertor with weighting resistors

  23. D/A Convertor with cross piece structure of resistor networks

  24. D/A Convertor with current sources

  25. Compandors and non-linear encoders

  26. Compression and expansion characteristics

  27. A-low compression characteristic

  28. Unipolar and Bipolar Signal, Signal NRZ, RZ, TPC, SPC, HDB3,AMI

  29. Code HDB3 • Maximal 3 zeroes in sequence • When the sequence of 4 or more zeroes exist, then forth one is encoded as the impulse with the same polarity as the previous one • This bipolarity interruption must be positive after negative and negative after possitive (zero direct current part)

  30. Isolation impulse

  31. Identification of impulse

  32. Decision eye – bipolar signal

  33. Decision eye – unipolar signal, basic noise

  34. Influence of impulse interference

  35. Influence of jitter

  36. Generation of AMI signal

  37. Quantizing distortion

  38. Peak limiting

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