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Chapter 6 Multiplexingand Error Detection/Correction 1/60 By Dr.Sukchatri P.

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Presentation on theme: "Chapter 6 Multiplexingand Error Detection/Correction 1/60 By Dr.Sukchatri P."— Presentation transcript:

1 Chapter 6 Multiplexingand Error Detection/Correction 1/60 By Dr.Sukchatri P.

2 Contents 2/60 Multiplexing Many to one/one to many Types of multiplexing Telephone system Error Detection/Correction Types of Errors Detection Correction

3 Multiplexer/Demultiplexer

4

5 Multiplexing VS No Multiplexing 5/60

6 Catagories of multiplexing

7 Type of Multiplexer

8 Frequency Division Multiplex (FDM)

9 Time Division Multiplex (TDM)

10 FDM Multiplexing process, Time domain

11 FDM Multiplexing process, Frequency domain

12 FDM demultiplexing process, time domian

13 FDM demultiplexing, frequency domain

14 Time-Division Multiplexing (TDM)

15 Synchronous TDM

16 Synchronous TDM, multiplexing process

17 Synchronous TDM, demultiplexing process

18 Framing bits

19 Data rate calculation for frames

20 Asynchronous TDM

21 Examples of asynchronous TDM frames A.Case 1 : only three lines sending data

22 Examples of asynchronous TDM frames B.Case 2 : only four lines sending data

23 C. Case 3 : all five lines sending data Examples of asynchronous TDM frames

24 Multiplexing and inverse multiplexing

25 Telephone network

26 Catagories of Telephone service

27 Catagories of analog services

28 Analog switched service

29 Analog leased service

30 Analog hierarchy

31 Categories of Digital services

32 Switched/56 services

33 DDS services (Digital Data Service) DSU : Digital Service Unit

34 DS hierarchy (Digital Signal)

35 T-1 line for multiplexing telephone lines PCM: Plus Code Modulation :> convert analog-digital

36 T-1 frame structure

37 Fractional T-1 line DSU : Digital Service Unit CSU : Channel Service Unit

38 Types of errors Error Detection and Correction

39 Single-bit error

40 Multiple-bit error

41 Burst error of length five

42 Redundancy

43 Detection methods

44 Even parity VRC concept

45 Longitudinal Redundancy Check (LRC)

46 VRC and LRC

47 Cyclic Redundacy Check (CRC) CRC generator and checker

48 Binary division in a CRC generator

49 Polynomial

50 A polynomial representing a divisor

51 Standard polynomials

52 Checksum

53 Data unit and checksum

54 Error Correction Data and redundancy bits

55 Positions of redundancy bits in Hamming code

56 Redundancy bits calculation : Hamming Code

57 Example of redundancy bit calculation

58 Single-bit error

59 Error detection using Hamming code

60 Questions/Answers

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