Topic 5 - Parity checking

Question 1

Name 2 problems with parity checking

Answer 1

It can only detect an odd number of errors

It cannot correct the errors found

Question 2

What is the method for parity checking?

Answer 2

1) The sending and receiving computers agree the protocol to be used (even or odd)
2) The sending computer adds the correct parity bit to the binary data (either an extra 1 or 0)
3) The sending computer sends the binary data, including the parity bit
4) The receiving computer checks to make sure the overall parity of the data received is as agreed (an even or odd number of 1 bits)
5) If the parity of the data is incorrect, the receiving computer will request that the data is transmitted again