A method of transmitting a context identifier of header compression on a data packet connection in a telecommunications system, in which the context identifier can be transmitted either as part of a compressed data packet or in the header of a data packet to be transmitted at the convergence protocol layer of the telecommunications system. The floor conditioning system improves the ease of use as compared to currently available sanding or polishing devices. When one of the sensors fails, the control unit estimates the voltage that would have otherwise been detected by the failed voltage sensor based on the switching state in the converter and the voltage detected by the other voltage sensor. The light shelter has a retaining lip designed to engage the bracket to create a substantially watertight seal. The outsole is produced by forming a molding material immediately below the upper and by causing the molding material to flow into the clearances during the forming of the molding material.