a. Under what circumstances are parity bits and cyclic redundancy checks (CRC) appropriate error detection techniques? (2 marks) b. The following CRC polynomial generator is used in Wideband Code Division Multiple Access network applications: x8 + x2 + x4 + x3 + x + 1 i. What binary number does this polynomial represent? ii. In applying this CRC, what is the probability an error burst greater than 9 bits will escape detection if it is assumed all error patterns within the burst are equi- probable? (3 marks) a. Under what circumstances are parity bits and cyclic redundancy checks (CRC) appropriate error detection techniques? (2 marks) b. The following CRC polynomial generator is used in Wideband Code Division Multiple Access network applications: x8 + x2 + x4 + x3 + x + 1 i. What binary number does this polynomial represent? ii. In applying this CRC, what is the probability an error burst greater than 9 bits will escape detection if it is assumed all error patterns within the burst are equi- probable