If the no.of 1’s in a frame is even, then even parity is used by adding the bit ‘1’with zero value. The receiver counts the no.of bits ( 1’s) in a frame to add the parity bit. The redundant bit called parity bit is added to make the no.of bits even or odd in case of even parity or odd parity. They are, parity check, cyclic redundancy check (CRC) and longitudinal redundancy check. The errors in the received data can be detected by using 3 types of error detection codes. If there is ‘m’ no.of data bits and ‘r’ no.of redundant bits, then the combinations of information will be 2r.Ģr > = m+r+1 Types of Error Detection Codes If the data received by the receiver finds the error, then it executes the error-correcting codes, to correct and recover the data automatically. In this type of error correction, the receiver requests back the sender to retransmit the data if the receiver detects the error.
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