One error control scheme for ATM header

Wireless Asynchronous Transfer Mode (WATM) have been proposed by ETSI and ATM Forum for some communications applications. The ATM employs header error control (HEC) to protect the ATM cell header from bit error and/or avoid the miss forwarding of ATM cell. Standard HEC is based on CRC polynomial. Its decoding allows single error correction and it is usually based on exploitation of look-up tables or other relatively complex procedure caused by necessity to determine the position of the single error in a ATM cell header. This paper describes one additional FEC method for ATM cell header. The new approach has slightly better error control capability and simultaneously its decoding method is very simple and avoids the usage of look up tables. The FEC scheme is using the same redundancy as the standard method – 1 byte, but it allows correcting not only all single-bit errors in a header, but also some double-bit errors, triple-bit errors and quadruple-bit errors.