The Fox DataDiode is an elegant solution for the high security transfer for data between networks. Central to the Fox DataDiode solution is the Fox Hardware DataDiode, a unique hardware-based, communication device, which operates in a unidirectional mode and makes use of a gigabit optical data link to transfer data in a single direction (hence the term ‘diode’), between a low-security network and a network with a high-security level. Needless to say, this solution can also be used where both networks have the same level of security.