The sending and receiving computers agree on the parity protocol (odd or even)., The sending computer adds a parity bit to each byte to make the byte odd or even parity., The sending computer sends the binary data including the parity bits., The receiving computer checks the parity of each byte received and checks it against the agreed protocol., If the parity of the byte is incorrect, the receiving computer requests the data to be re-sent..

Parity check

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