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DATA COMMUNICATION Lecture-40
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Recap of Lecture 39 Error Control Stop-and-Wait ARQ Sliding Window ARQ
Go-back-n Selective Reject Data Link Protocols
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Overview of Lecture 40 Data Link Protocols Asynchronous Protocols
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Asynchronous Protocols
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XMODEM
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Other Asynchronous Protocols
YMODEM ZMODEM BLAST (Blocked Asynchronous Transmission) KERMIT
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Synchronous Protocols
Fast transmission for LAN, MAN, and WAN Synchronous Protocols Character(Byte)-oriented protocols Bit-oriented protocols
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Synchronous Protocols
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Character-Oriented Protocols
Not as efficient as Bit-Oriented Protocols Seldom used now Easy to comprehend and provide the basis to study Bit-Oriented Protocols
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BSC (Binary Synchronous Communication)
A popular character-oriented data link protocol Developed by IBM in 1964 Half-duplex transmission with stop-and-wait ARQ Usable in both point-to-point and multipoint configuration
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BSC (Binary Synchronous Communication)
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Data Frames Simple BSC data frame
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Data Frames BSC frame with a header
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Data Frames A Multiblock Frame
Text in a message is often divided between several blocks To increase the likelihood of error detection
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Data Frames Multiframe Transmission
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Control Frames Control frames serve three purposes:
Establishing connections Maintaining flow and error control during data transmission Terminating connections
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Control Frames Contain control characters but no data
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Summary Data Link Protocols Asynchronous Protocols
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Suggested Reading Section11.1, 11.2
“Data Communications and Networking” 2nd Edition by Behrouz A. Forouzan
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