1. Modern Possibilities of Access and Transport Networks Vladislav Skorpil

2. The principle of Time Division Multiplex

5. The Principle of Pulse Code Modulation (PCM)

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

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

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

16. Transmiter part

17. Receiver part

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

20. Quantizing step encoder

22. Weighting encoder (Bit encoder)

24. Counting Analogue to Digital Convertor

25. Tracking A/D Convertor

26. Parallel A/D Convertor

27. Compenzating A/D Convertor

28. Shannon decoder

29. Shannon decoder response

30. Shannon Rack decoder

31. Shannon-Rack Decoder Response

32. Weighting Decoder (Bit Encoder)

33. Operational Amplifier

34. D/A Convertor with weighting resistors

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

36. D/A Convertor with current sources

37. Compandors and non-linear encoders

38. Compression and expansion characteristics

39. A-low compression characteristic

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

41. 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)

42. Isolation impulse

43. Identification of impulse

44. Decision eye – bipolar signal

45. Decision eye – unipolar signal, basic noise

46. Influence of impulse interference

47. Influence of jitter

48. Generation of AMI signal

49. Quantizing distortion

50. Peak limiting

53. Time behaviour of sampling

54. Spectrum of sampling signal – PAM 1st sort

55. Ideal PAM 1st order (wide of samples approaches to zero

56. Spestrum of sampling signal -2nd order

57. Spectrum of PAM 2nd order – wide of samples equals to sampling periode

58. This is the end of my slides to the theme Modern possibilities of access and transport networks If you have any questions, you can write e- mail to: skorpil@feec.vutbr.cz