There is a communications parity system. It employs a three input XOR to generat

Question

There is a communications parity system. It employs a three input  XOR to generate "Even" parity in the transmitted messages, it means a fourth bit will be added with the result of the XOR. If the total number of bits is odd the an extra 1 will be added to make it even, or if the initial number of 1's is even then a zero will be added to keep even parity. If the receiver detects an odd number of 1's it means there is an errror and the message will be rejected. An even number of 1's in the receiver will accept the message. Match the columns for the following cases:

Match the correct answer selectin A,B, C or D

Explanation / Answer

1. Original Message 0,0,0. The fourth bit needed to make even parity in the transmitted message {([0],0,0,0}.

2. Original message 0,1,0. The fourth bit needed to make even parity in the transmitted message {[1],0,1,0}.

3. The received message is 1,1,0,1 and the expected parity is even. The message will be Rejected.

4. The received message is 1,0,0,1 and the expected parity is even. The message will be Accepted.

A,C,D,B

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