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"Redundancy : One error detection mechanism would be to send every data unit_x000D_ twice. The receiving device would then be able to do-bit-for-bit comparison_x000D_ between the two versions of the data. Any discrepancy would indicate an error,_x000D_ and an appropriate correction mechanism could be set in place .It would also be_x000D_ insupportably slow. Instead of repeating the entire data system, a shorter group_x000D_ of bits may be appended to the end of each unit. This technique is called_x000D_ redundancy because the extra bits are redundant to the information, they are_x000D_ discarded as soon as the accuracy of the transmission has been determined._x000D_ _x000D_ Source: http://in.docsity.com/en-docs/Electronic_Communication_and_Data_Communication__Lecture_notes__VIPIN"
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