The analogue Transmitter transmits the video to the train over a line of sight path of up to 200 metres. Several Transmitters can be installed to provide longer coverage, or when the track is curved and there is no line of sight. Alternatively a single digital Transmitter can be used

The Beacon transmits data to the train to control the displays and to select the frequencies for the platform

Two Trainborne Antennas receive the Transmitter and Beacon signals. Two units are used to provide spacial diversity

The Trainborne Receiver decodes the Beacon data and demodulates the video signals using the frequency data contained in the Beacon message. The Receiver also selects the best videos and switches them to the displays. The selection is based on the video quality in each of the parallel channels from the two Antennas. It is made within nS to ensure the best channel is always available to the driver who, despite the switching, sees rock solid pictures. The Trainborne Receiver automatically switches from one Transmitter to another as the train progresses along the track.