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Chapter 7
Data Link Control &
Data Link Protocol
By Dr.Sukchatri P.
Contents
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•Data Link Control•Line Discipline•Flow Control•Error Control•Data Link Protocols•Asynchronous Protocols•Synchronous Protocols•Character Protocol•Bit-Oriented Protocol
Data Link Control
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Data Link Control Functions
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Line discipline categories
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Line discipline concept : ENQ/ACK
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ENQ/ACK line discipline
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Poll/Select discipline
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Multipoint discipline
Select
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Poll
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Categories of flow control
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Stop-and-wait
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Sliding window
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Sender sliding window
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Receiver sliding window
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Example of sliding window
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Categories of error control
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Stop-and-wait ARQ
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Stop-and-wait ARQ
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Go-back-n
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Go-back-n
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Go-back-n
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Data Link Protocols
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Asynchronous Protocols
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XMODEM Frames
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Synchronous Protocols
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BSC Frames
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A Simple BSC data frame
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A BSC frame with a header
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Multiblock frame
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Multiframe transmission
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BSC Control frame
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Control Frame
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Control Frame
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Control Frame
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Byte stuffing
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Bit-Oriented Protocols
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HDLS Configurations
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HDLS Configurations
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HDLS Configurations
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HDLC Modes
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HDLC Frame types
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HDLC Frame types
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HDLC Frame types
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HDLC Flag Field
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Bit Stuffing in HDLC
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HDLC Address field
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HDLC Control Fields
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I-Frame : Information field , contains the user’s dataS-Frame : Supervisory frames, acknowledgment, flow control, & error controlU-Frame : Unnumbered frames , exchange session management and control information between connected devices.
Poll/Final in HDLC
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HDLC Information Field
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FCS Field
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S-frame control field in HDLC
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Use of P/F bit in polling and selecting
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RR : Receive Ready
Use of P/F bit in polling and selecting
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RR : Receive Not Ready
Use of P/F bit in polling and selecting
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U-frame control field in HDLC
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U-frame control field in HDLC
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Example of polling using HDLC
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Example of selecting using HDLC
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Example of peer-to-peer communication
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Example of peer-to-peer communication
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Questions/Answers
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