1. Chapter 7 Data Link Control & Data Link Protocol By Dr.Sukchatri P.

2. Contents 2/62 Data Link Control Line Discipline Flow Control Error Control Data Link Protocols Asynchronous Protocols Synchronous Protocols Character Protocol Bit-Oriented Protocol

3. Data Link Control 3/62

4. Data Link Control Functions 4/62

5. Line discipline categories 5/62

6. Line discipline concept : ENQ/ACK 6/62

7. ENQ/ACK line discipline 7/62

8. Poll/Select discipline 8/62 Multipoint discipline

9. Select 9/62

10. Poll 10/62

11. Categories of flow control 11/62

12. Stop-and-wait 12/62

13. Sliding window 13/62

14. Sender sliding window 14/62

15. Receiver sliding window 15/62

16. Example of sliding window 16/62

17. Categories of error control 17/62

18. Stop-and-wait ARQ 18/62

19. Stop-and-wait ARQ 19/62

20. Go-back-n 20/62

21. Go-back-n 21/62

22. Go-back-n 22/62

23. Data Link Protocols 23/62

24. Asynchronous Protocols 24/62

25. XMODEM Frames 25/62

26. Synchronous Protocols 26/62

27. BSC Frames 27/62

28. A Simple BSC data frame 28/62

29. A BSC frame with a header 29/62

30. Multiblock frame 30/62

31. Multiframe transmission 31/62

32. BSC Control frame 32/62

33. Control Frame 33/62

34. Control Frame 34/62

35. Control Frame 35/62

36. Byte stuffing 36/62

37. Bit-Oriented Protocols 37/62

38. HDLS Configurations 38/62

39. HDLS Configurations 39/62

40. HDLS Configurations 40/62

41. HDLC Modes 41/62

42. HDLC Frame types 42/62

43. HDLC Frame types 43/62

44. HDLC Frame types 44/62

45. HDLC Flag Field 45/62

46. Bit Stuffing in HDLC 46/62

47. HDLC Address field 47/62

48. HDLC Control Fields 48/62 I-Frame : Information field, contains the user ’ s data S-Frame : Supervisory frames, acknowledgment, flow control, & error control U-Frame : Unnumbered frames, exchange session management and control information between connected devices.

49. Poll/Final in HDLC 49/62

50. HDLC Information Field 50/62

51. FCS Field 51/62

52. S-frame control field in HDLC 52/62

53. Use of P/F bit in polling and selecting 53/62 RR : Receive Ready

54. Use of P/F bit in polling and selecting 54/62 RR : Receive Not Ready

55. Use of P/F bit in polling and selecting 55/62

56. U-frame control field in HDLC 56/62

57. U-frame control field in HDLC 57/62

58. Example of polling using HDLC 58/62

59. Example of selecting using HDLC 59/62

60. Example of peer-to-peer communication 60/62

61. Example of peer-to-peer communication 61/62

62. Questions/Answers 62/62