A method and switch for controlling the allocation of priority of TCP packets, more particularly for distinguishing between data and control packets and assigning an increased priority to control packets. The housing and chip may be used for sending andor receiving radiation. The substrate has formed therein an aperture for receiving and electrically and mechanically engaging the first ground conductor. With the configuration, the influence of a failure occurring in the on-chip redundancy system can be prevented from being exerted on the comparator measure. The toner supplying unit supplies fresh toner particles to the developing unit.