DATA
COMMUNICATION
Lecture-39
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Error Control, Data Link Protocols - Data Communication - Lecture Slides, Slides of Data Communication Systems and Computer Networks
Error Control, Stop and Wait ARQ, Sliding Window ARQ, Selective Reject, Data Link Protocols, Damaged Frame, Lost Frame are points you can learn these slides.
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DATA
COMMUNICATION
Lecture-
Recap of Lecture 38
Flow Control
- Stop-and-Wait
- Sliding Window
Error Control
- Stop-and-Wait ARQ
Error Control
Stop-and-Wait ARQ:
Damaged Frame
Stop-and-Wait ARQ:
Lost ACK
Go-Back-n ARQ: Damaged
Frame
Go-Back-n ARQ: Lost ACK
Selective-Reject ARQ:
Damaged Frame
Data Link Protocols
Asynchronous Protocols
Start and stop bits, variable-length gaps between characters ⇒ Inherent slowness
Not complex and inexpensive
- Used primarily in modems
- Being replaced by higher-speed synchronous mechanisms
XMODEM
File transfer protocol between PCs using telephone line
Half-duplex stop-and-wait ARQ protocol
Control frames from the receiver
- ACK: Acknowledgement
- NAK: Error or start of transmission
- CAN: Aborts the transmission Docsity.com