A pneumatic tire comprises circumferentially-continuously-extending crown main grooves and shoulder main grooves to divide the tread portion into one crown rib, two middle ribs and two shoulder ribs. The hollow bodies which are thus produced can be both inserted into steel cages and also connected with each other via bars and built into concrete layers. The MSOH, and possibly RSOH, sections of the STM-N frame of the high bit-rate SDH signal are handled by the MS digital cross connect in a manner equivalent to the payload section thus providing transparency for the payload and for the MSOH section, as well as, possibly, for the RSOH section too. A detector is coupled to the gantry and is adapted to receive the x-ray flux and generate therefrom a detector signal.