Patent ID: 8327038

Claim:
A system to connect at least two items of equipment, a first item of equipment having a first confidentiality level and a second item of equipment having a second confidentiality level, the first and second items of equipment in communication with equipment external to the system by use of a protocol, wherein the system comprises: a medium to allow a transmission of data between the first and second items of equipment; a first interface between the medium and the first item of equipment; a second interface between the medium and the second item of equipment; a first module which interfaces with the first item of equipment to allow a first monodirectional adaptation of the protocol and to allow the transmission of data monodirectionally; and a second module which interfaces with the second item of equipment to allow a second monodirectional adaptation of the protocol and to allow a reception of the data monodirectionally from the first module, wherein the monodirectional adaptation includes a logical adaptation and a physical adaptation, and wherein the first and second modules each comprise: a first submodule adapted to carry out the logical adaptation of the protocol between a monodirectional protocol and a different predetermined protocol; and a second submodule adapted to carry out the physical adaptation of the protocol between the monodirectional protocol and the different predetermined protocol, and wherein the protocol is a USB protocol, and each first submodule is configured to: recover USB frames which are transmitted without modification by the first submodule; re-encapsulate the USB frames in one of a proprietary protocol or a non-proprietary monodirectional protocol to send through the monodirectional link; recover the data without the information related to the USB sending protocol; and re-encapsulate the data without the information related to the USB sending protocol.