I think this is about networking not banking. ATM stands for Asyncrhonous Transfer Mode and HEC stands for Header Error Control.
CRC is used for this purpose. The control field is HEC (header error control).
Hec Cyre died in 1971.
Hec Cyre was born in 1901.
Hec Highton died in 1985.
Hec Clouthier was born in 1949.
HEC Paris was created in 1881.
Hec Fowler died in 1987.
Hec Gervais died in 1997.
Hec Gervais was born in 1934.
HEC Lausanne was created in 1911.
HEC Montréal was created in 1907.
soon it will be in HEC ranking