Adapter (3, 5) for processing electrical signals in an installation comprising a video camera equipment and a remote equipment, said adapter comprising - a digital coding multiplexing and serialising circuit (22, 35, 44), - one or more optical transmitters (24, 38, 48), which inputs are connected to the digital coding multiplexing and serialising circuit (22, 35, 44), - a de-serialising de-multiplexing and digital decoding circuit (26, 32, 45) and - one or more optical receivers (25, 31, 50'), which outputs are connected to the de-serialising de-multiplexing and digital decoding circuit (26, 32, 45), characterized in that said adapter (3, 5) comprises - a timing reference encoding circuit, able to provide an adjusted version of the digital representation of a timing reference signal, which output is connected to the digital coding multiplexing and serialising circuit (22, 35, 44),and - a video frame synchroniser, adapted to delay a program video output sent by the video camera equipment by up to a video frame period, wherein the program delay is controlled by a genlock monitoring and control circuit, said genlock monitoring and control circuit being able to compare the timing of the program video output and the adjusted version of the digital representation of a timing reference signal provided by the timing reference encoding circuit, able to control both the timing reference encoding circuit and the video frame synchroniser and able to adjust the timing reference encoding circuit to match the timing of the program video output to the adjusted version of the digital representation of a timing reference signal provided by the timing reference encoding circuit or to control the video frame synchroniser to synchronise the program video output to the adjusted version of the digital representation of a timing reference signal provided by the timing reference encoding circuit. - a digital coding multiplexing and serialising circuit (22, 35, 44), - one or more optical transmitters (24, 38, 48), which inputs are connected to the digital coding multiplexing and serialising circuit (22, 35, 44), - a de-serialising de-multiplexing and digital decoding circuit (26, 32, 45) and - one or more optical receivers (25, 31, 50'), which outputs are connected to the de-serialising de-multiplexing and digital decoding circuit (26, 32, 45), characterized in that said adapter (3, 5) comprises - a timing reference encoding circuit, able to provide an adjusted version of the digital representation of a timing reference signal, which output is connected to the digital coding multiplexing and serialising circuit (22, 35, 44),and - a video frame synchroniser, adapted to delay a program video output sent by the video camera equipment by up to a video frame period, wherein the program delay is controlled by a genlock monitoring and control circuit, said genlock monitoring and control circuit being able to compare the timing of the program video output and the adjusted version of the digital representation of a timing reference signal provided by the timing reference encoding circuit, able to control both the timing reference encoding circuit and the video frame synchroniser and able to adjust the timing reference encoding circuit to match the timing of the program video output to the adjusted version of the digital representation of a timing reference signal provided by the timing reference encoding circuit or to control the video frame synchroniser to synchronise the program video output to the adjusted version of the digital representation of a timing reference signal provided by the timing reference encoding circuit.