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CRC (Cyclic Redundancy Check) - an explanation

(1) Mathematical algorithm that computes numerical value based on bits in block of data. Number is transmitted with data and used by receiver. Uses same algorithm to insure accurate delivery of data by comparing results of algorithm and number received. If mismatch occurs, an error in transmission is presumed. (2) Form of error detection accomplished by reading block of incoming data, operating on the binary number equivalent of this block (e.g., dividing by another binary number), and noting remainder. If remainder is same as character transmitted in message, assumes transmission was error free.