. Also called Check bit.
. Added to block of data for error detection purpose.
. Used in data transmission to ensure total number of 1's is even or odd.
. Purpose is to ensure data is not corrupted during transmission.
. Added to block of data for error detection purpose.
. Used in data transmission to ensure total number of 1's is even or odd.
. Purpose is to ensure data is not corrupted during transmission.
Types of Parity:
Even Parity: If total number of 1's is even, parity bit=0 otherwise parity bit=1.
Odd Parity: If total number of 1's is odd, parity bit=0 otherwise parity bit=1.
How it works?
. Sender and receiver must both agree to use parity checking and also whether it is even or odd.
. For even, at transmission side, parity generator checks whether total number of 1's are even and adds 0 or 1 accordingly.
. In receiver side, parity checker checks total number of 1's.
. If it is matched, data is correctly transmitted.
. If not, error message is sent or re-transmission of data takes place.
