Computer Science : S2 : L3 : Error Detection Methods
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7 Terms
Data corruption
The chance that data has been changed or lost during transmission, making it unreliable.
Parity checking
A method to check if data has been changed following transmission, based on the number of bits in a byte. The parity bit determines if there is an even or odd number of 1's in the data.
Even parity
If the parity bit is 0, there is an even number of 1's in the data.
Odd parity
If the parity bit is 1, there is an odd number of 1's in the data.
Echo check
Sending data to another device and receiving it back to check for errors. Not always reliable due to potential errors during the return transmission.
Checksum
A simple method of error detection where an additional value, the checksum, is sent at the end of a block of data. The checksum is recalculated at the receiving end and compared to the transmitted checksum to determine if the data was transmitted without errors.
Checksum algorithm
Steps to calculate the checksum by adding the bytes together, dividing the sum by 256, rounding down to the nearest whole number, multiplying by 256, and calculating the difference between the sum and the result.