Error Detection And Correction In Data Communications Using Parity Bit And Cyclic Redundancy Check

ABSTRACT

The distance over which data moves within a computer may vary from a few thousandths of an inch, as is the case within a single IC chip, to as much as several feet along the backplane of the main circuit board. Over such small distances, digital data may be transmitted as direct, two-level electrical signals over simple copper conductors. Except for the fastest computers, circuit designers are not very concerned about the shape of the conductor or the analog characteristics of signal transmission.

Frequently, however, data must be sent beyond the local circuitry that constitutes a computer. In many cases, the distances involved may be enormous. Unfortunately, as the distance between the source of a message and its destination increases, accurate transmission becomes increasingly difficult. This results from the electrical distortion of signals traveling through long conductors, and from noise added to the signal as it propagates through a transmission medium. Although some precautions must be taken for data exchange within a computer, the biggest problems occur when data is transferred to devices outside the computer's circuitry. 

TABLE OF CONTENTS

DEDICATION

ACKNOWLEDGEMENT

ABSTRACT

CHAPTER ONE

1.0 INTRODUCTION

1.1 STATEMENT OF PROBLEM

1.2 PURPOSE OF STUDY

1.3 IMPORTANCE OF THE STUDY

1.4 DEFINITION OF TERMS

CHAPTER TWO

2.0 LITERATURE REVIEW

2.2 PARITY AND CHECKSUMS

CHAPTER THREE

3.0 CYCLIC REDUNDANCY CHECK

3.1 DATA TRANSFER IN DIGITAL CIRCUITS

CHAPTER FOUR

4.0 ERROR DETECTING METHODS

4.1 CYCLIC REDUNDANCY CHECK METHOD (CRC)

CHAPTER FIVE: CONCLUSION

5.1 LIMITATION OF STUDY

5.2 SUGGESTIONS FOR FURTHER STUDY

5.3 REFERENCE