DATA COMMUNICATION Lecture-39.

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Presentation transcript:

DATA COMMUNICATION Lecture-39

Recap of Lecture 38 Flow Control Stop-and-Wait Sliding Window Error Control Stop-and-Wait ARQ

Overview of Lecture 39 Error Control Stop-and-Wait ARQ Sliding Window ARQ Go-back-n Selective Reject Data Link Protocols

Error Control

Stop-and-Wait ARQ: Damaged Frame

Stop-and-Wait ARQ: Lost Frame

Stop-and-Wait ARQ: Lost ACK

Go-Back-n ARQ: Damaged Frame

Go-Back-n ARQ: Lost Frame

Go-Back-n ARQ: Lost ACK

Selective-Reject ARQ: Damaged Frame

Data Link Protocols Data link protocol is a set of specifications used to implement the data link layer It contains rules for line discipline, flow control, and error handling

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

Asynchronous Protocols

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

XMODEM

Summary Error Control Stop-and-Wait ARQ Sliding Window ARQ Go-back-n Selective Reject Data Link Protocols

Suggested Reading Section 10.3, 11.1, “Data Communications and Networking” 2nd Edition by Behrouz A. Forouzan