Encoding Techniques and Types - Data Communication - Lecture Slides, Slides of Data Communication Systems and Computer Networks

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DATA

COMMUNICATION

Lecture-

Recap of Lecture 13

 Signals

 Analog and Digital Data & Signals

 Periodic & Aperiodic Signals

 Sine Waves and its Characteristics

 Time and Frequency Domain

 Frequency Spectrum and Bandwidth

 Other Definitions of Bandwidth

 Digital Signals

Introduction

 Information must be transformed into signals before it can be transformed across the communication media

 How this information is transformed depends upon its original format and on the format of the communication hardware

Conversion Methods

Digital-to-Digital Conversion

Types of Digital-to-Digital

Encoding

Digital/Digital Encoding

Unipolar Polar Bipolar

Unipolar Encoding

Pros and Cons of Unipolar

Encoding

 PROS

• Straight Forward and Simple
• Inexpensive to Implement

 CONS

• DC Component
• Synchronization

Polar Encoding

 Polar encoding uses two voltage levels

• One positive and one negative

 Average voltage level on the line is reduced

 DC Component problem of Unipolar encoding is alleviated

Types of Polar Encoding

Non Return to Zero-Level

(NRZ-L)

Non Return to Zero-Invert

(NRZ-I)