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Chapter 6 New - CSC 311 Chapter Six Data Integrity CSC 311...

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CSC 311 Chapter Six Data Integrity
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CSC 311 We are concerned here that the information received is identical to the information that was sent. To insure this, we need to be able to detect errors: Once detected, we will examine how to correct the errors so discovered.
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CSC 311 Simple error detection technique: Parity check. Count the number of ones in the data, add a parity bit to the data and set the value of the parity bit to make the total number of 1’s transmitted either even (even parity) or odd (odd parity)
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CSC 311 Parity checking is not a reliable error detection technique unless the probability of error is remote. It is for example, often used inside microprocessors to check the bus errors and the like. Major disadvantage of parity checking is that it will only detect an odd number of errors. For example, it can detect a change of value in 1 or 3 bits, but not a change in value of two or four bits. For data transmission over a network, this is unacceptable:
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Chapter 6 New - CSC 311 Chapter Six Data Integrity CSC 311...

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