In case of even parity check, if the count of 1s is even, the frame is accepted, otherwise, it is rejected. Receiver’s End − On receiving a frame, the receiver counts the number of 1s in it. If a number of 1s is even, the parity bit value is 1. In case of odd parity: If a number of 1s is odd, the parity bit value is 0.If a number of 1s is odd, the parity bit value is 1. In the case of even parity: If a number of 1s is even, the parity bit value is 0.Sender’s End − While creating a frame, the sender counts the number of 1s in it and adds the parity bit the value of which is determined as follows. Odd Parity − Here the total number of bits in the message is made odd. The parity check is suitable for single bit error detection only.Įven Parity − Here the total number of bits in the message is made even. The parity check is done by adding an extra bit, called parity bit, to the data to make the number of 1s either even or odd depending upon the type of parity. There are three main techniques for detecting errors in data frames: Parity Check, Checksum and Cyclic Redundancy Check (CRC). If it finds that the data is free from errors, it removes the redundant bits before passing the message to the upper layers. The receiver performs necessary checks based upon the additional redundant bits.
It does not take into account the number of error bits and the type of error.įor error detection, the sender needs to send some additional bits along with the data bits. The corrupted bits leads to spurious data being received by the receiver and are called errors.Įrror detection techniques are responsible for checking whether an error has occurred or not in the frame that has been transmitted via the network. When bits are transmitted over the computer network, they are subject to get corrupted due to interference and network problems.
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