There are disclosed various methods, apparatuses and computer program products for media encapsulating and decapsulating. The surface light source device includes a housing including a bottom plate, a light source that is arranged on the bottom plate and illuminates the liquid crystal display, and a plurality of radiator fins arranged at a spacing from each other. The pre-calculated mappings are adjusted according to one or more transmission parameters of the data-carrying signals. At least one coupling is provided between the seat and the rear foot.