Chapter 3 The Data Link Layer.

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Chapter 3 The Data Link Layer.

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Presentation transcript:

Chapter 3 The Data Link Layer

Data Link Layer Design Issues Services Provided to the Network Layer Framing Error Control Flow Control

Functions of the Data Link Layer Provide service interface to the network layer Dealing with transmission errors Regulating data flow Slow receivers not swamped by fast senders

Functions of the Data Link Layer (2) Relationship between packets and frames.

A character stream. (a) Without errors. (b) With one error. Framing A character stream. (a) Without errors. (b) With one error.

Framing (2) (a) A frame delimited by flag bytes. (b) Four examples of byte sequences before and after stuffing.

Framing (3) Bit stuffing (a) The original data. (b) The data as they appear on the line. (c) The data as they are stored in receiver’s memory after destuffing.

Error Detection and Correction Error-Correcting Codes Error-Detecting Codes

Error-Correcting Codes Use of a Hamming code to correct burst errors.

Error-Detecting Codes