What do you mean by the term VRC

What do you mean by the term VRC? Describe in brief.

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This is the most common and least costly method for Error Detection. In VRC, a parity bit is added to each and every data unit in such a way that the total number of 1s becomes even for the even parity. This can detect all single-bit errors. This can detect burst errors just if the total number of errors in each and every data unit is odd.

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