Computer Science · Oct / Nov 2022 · Paper 12 · Question 5

8 bytes of data are transmitted from one computer to another. Each byte of data has a parity bit. The data is also sent with a parity byte. Each bit in the parity byte allows a check to be performed on each column of bits. A parity check is performed on the data and an error is found in one bit. The table shows the data that was received. Parity bit Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 Bit 8 Byte 1 0 1 0 1 0 0 1 1 Byte 2 1 0 0 1 1 1 1 1 Byte 3 1 1 1 1 1 1 0 0 Byte 4 1 1 0 1 0 1 0 1 Byte 5 1 0 0 0 1 1 1 0 Byte 6 1 1 1 0 1 0 1 1 Byte 7 1 1 0 0 1 1 0 0 Byte 8 1 1 1 1 0 0 1 1 Parity byte 1 0 1 1 0 1 1 1 Identify which bit has an error by giving the Byte number and Bit number. Explain how you found the error. Byte number Bit number Explanation [4]

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