Chapter 7 Data Link Control & Data Link Protocol By Dr.Sukchatri P.
Chapter 7
Jan 03, 2016
Chapter 7. Data Link Control & Data Link Protocol. By Dr. Sukchatri P. Contents. Data Link Control Line Discipline Flow Control Error Control Data Link Protocols Asynchronous Protocols Synchronous Protocols Character Protocol Bit-Oriented Protocol. Data Link Control. - PowerPoint PPT Presentation
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Transcript
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
3/62
Data Link Control Functions
4/62
Line discipline categories
5/62
Line discipline concept : ENQ/ACK
6/62
ENQ/ACK line discipline
7/62
Poll/Select discipline
8/62
Multipoint discipline
Select
9/62
Poll
10/62
Categories of flow control
11/62
Stop-and-wait
12/62
Sliding window
13/62
Sender sliding window
14/62
Receiver sliding window
15/62
Example of sliding window
16/62
Categories of error control
17/62
Stop-and-wait ARQ
18/62
Stop-and-wait ARQ
19/62
Go-back-n
20/62
Go-back-n
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Go-back-n
22/62
Data Link Protocols
23/62
Asynchronous Protocols
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XMODEM Frames
25/62
Synchronous Protocols
26/62
BSC Frames
27/62
A Simple BSC data frame
28/62
A BSC frame with a header
29/62
Multiblock frame
30/62
Multiframe transmission
31/62
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
36/62
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
46/62
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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