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Methods for Determining the Cyclic Redundancy
Error Protection on Magnetic Tape and Magnetic
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7-track magnetic tapes 800 bpi magnetic 9-track BCH codes binary block codes block length bpi magnetic tapes buffer storage burst of length byte check character check codes circuits code word continuous ARQ convolutional codes correctable error correcting codes CRC character CRC register CRC(x cyclic code cyclic redundancy check data bits data character data transmission systems decoder detecting and correcting determined Equation erroneous track error burst error control error detecting error is undetectable error-free errors occur ESZK feedback shift register Fire code half-duplex Hamming code hardware method information bits information block information character Kodes mod 2 added mod g(x n-tuple nomial number of errors number of information number of l's odd number parity bits parity check bits parity check matrix performed processing the last reading backward remainder Serial CRC shown in Fig single track error stop-and-wait ARQ transmitted two-direction parity check uncorrectable undetectable errors vector VRC bit zero