The document describes different types of data link protocols, including asynchronous and synchronous protocols, as well as character-oriented and bit-oriented protocols. It also provides details on specific protocols like XMODEM and HDLC, including their frame formats and how fields like address, control, information and frame check sequence (FCS) are used.

1. Chapter 11
Data Link Protocols
• Asynchronous Protocols
• Synchronous Protocols
• Character-Oriented Protocols
• Bit-Oriented Protocols
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2. Figure 11-1
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3. Figure 11-2
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4. Figure 11-3
XMODEM
XMODEM is Half Duplex stop-and-wait ARQ protocol.
Transmissison begins after sending NAK frame by receiver.
CAN signal aborts the transmission.
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5. Figure 11-4
OR
Byte oriented protocols
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6. Figure 11-5
BSC-BINARY SYNCHRONOUS COMMUNICATION
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7. Figure 11-6
Simple BSC Frame
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8. Figure 11-7
A Frame with Header
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9. Figure 11-8
Multiblock Frame
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10. Figure 11-9
Multiframe Transmission
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11. Figure 11-10
Control Frame
Contains control characters but no data.
Used to send commands or get information from other device.
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12. Figure 11-11
Control Frames
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13. Figure 11-11-continued
Control Frames
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14. Figure 11-11-continued
Control Frames
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15. Figure 11-12
Byte Stuffing
DATA LINK ESCAPE
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16. Figure 11-13
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17. Figure 11-14
HDLC Configuration
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18. Figure 11-14-continued
HDLC Configuration
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19. Figure 11-14-continued
HDLC Configuration
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20. Figure 11-15
HDLC Modes
NRM- NORMAL RESPONSE MODE
ARM- ASYNCHRONOUS RESPONSE MODE
ABM- ASYNCHRONOUS BALANCED MODE
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21. Figure 11-16
HDLC Frame Types
INFORMATION FRAME
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22. Figure 11-16-continued
HDLC Frame Types
SUPERVISORY FRAME
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23. Figure 11-16-continued
HDLC Frame Types
UNNUMBERED FRAME
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24. Figure 11-17
HDLC Flag Field
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25. Figure 11-18
Bit Stuffing
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26. Figure 11-19
HDLC Address Field
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27. Figure 11-20
HDLC Control Field
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28. Figure 11-21
Poll/Final
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29. Figure 11-22
HDLC Information Field
Combining data to be sent with acknowledgement of the frame
Received in one single frame is called piggybacking.
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30. Figure 11-23
HDLC FCS Field
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31. Figure 11-24
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32. Figure 11-25
Use of P/F Field
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33. Figure 11-25-continued
Use of P/F Field
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34. Figure 11-25-continued
Use of P/F Field
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35. Figure 11-25-continued
Use of P/F Field
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36. Figure 11-25-continued
Use of P/F Field
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37. Figure 11-26
U-Frame Control Field
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38. Figure 11-26-continued
U-Frame Control Field
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39. Figure 11-27
Polling Example
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40. Figure 11-28
Selecting Example
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41. Figure 11-29
Peer-to-Peer Example
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42. Figure 11-29-continued
Peer-to-Peer Example
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