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April 20, 2016

Distinguish between longitudinal redundacy check and cyclic redundancy check as used in data communication

(a) (i) Distinguish between Forward Error Correction (FEC) and Backward Error Correction (BEC).
(ii)Distinguish between longitudinal redundacy check and cyclic redundancy check as used in data communication (6 Marks)
(b) Calculate the CRC needed for the transmission of data stream 1001011 (4 Marks)
(c) Describe the following transmission line impairments.
(i) Delay distortion
(ii) Attenuation
(iii) Jitter
(iv) White noise (8 Marks)
(d) Scramble the following data bit stream 1000 0001 1000 0000 0011 using
(i) B8ZS (2 Marks)

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