An apparatus and a method for routing data in a radio data communication system having one or more host computers, one or more intermediate base stations, and one or more RF terminals organizes the intermediate base stations into an optimal spanning-tree network to control the routing of data to and from the RF terminals and the host computer efficiently and dynamically. The second port is operable to simultaneously carry a second type of data traffic over a sub-interface of the main physical interface. The torque transmitting device includes a piston partially defining two separate and independently pressurizable chambers. The obtained structure can be connected trough wire-bonding or flip chip connection. In the resolutionframe rate converter 31, pixels are added or extracted in accordance with the start position of a macro block, thus adjusting the input image signal to one than can easily be encoded to MPEG4 image codes. The filter is configured to receive an input signal in the form of a modulated chirped optical signal.