In a data transmission system, and a method for transmitting data in the gigabitsecond range, data are transferred from a source located on a rotary part to a stationary part via a slip ring system. Mobile Originated Interactive Menus are implemented as a feature of a Short Message Service Center. Each entity is then assigned to be a member of a particular group. In response to the cache command, a current way value of the replacement pointer corresponding to the specified set is replaced with the replacement way value.