Header Error Correction
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The Header Error Correction (HEC) is a field in the Asynchronous Transfer Mode cell consisting of an 8-bit checksum of the cell's header only.
It consists of the remainder of the division of the 32 bits of the header by the polynomial x8 + x2 + x + 1 plus the constant 01010101. This scheme is able to correct single-bit errors and detect many multiple-bit errors.