Error correction - retransmission, Computer Networking

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When an error is discovered the receiver is able to ask the sender to retransmit the entire data unit

Error Correction-Forward Error Correction

A receiver is able to use an error-correcting code which automatically corrects certain errors
Single-bit errors
Is able to be detected by the addition of parity bit which helps to find "error" or "no error" which is sufficient to detect errors
To correct errors the receiver is able to simply invert 0 to 1 or 1 to 0 but the problem is "locating" the position of error
To do thus requires enough redundancy bits
Condition: 2r >= m + r + 1

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