ISRO | ISRO CS 2015 | Question 51
In CRC if the data unit is 100111001 and the divisor is 1011 then what is dividend at the receiver?
(A) 100111001101
(B) 100111001011
(C) 100111001
(D) 100111001110
Answer: (B)
Explanation:
Step-1: Append (number of bits in divisor - 1) number of zeroes at the end of data unit Data unit = 100111001, append 3 zeroes at the end. = 100111001000 Step 2 Divide using xor subtraction: ______________ 1011) 100111001000 ( 101000001 1011 ------ 01011 1011 ------- 01000 1011 -------- 011 -------- Step 3 Perform Xor-sum of the remainder with the appended zeroes in data unit. = 100111001(000) xor (011) = 100111001011
So, option (B) is correct.
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