In orthogonal frequency division multiplexing multiple-input multiple-output systems, a wireless transmitreceive unit selects a random access channel and a phase for a constant amplitude zero auto correlation sequence for RACH transmission. The first and the second contact partners are lead with latching means together to form a plug-in electrical connection in the plug housing. The CPU of the printing apparatus controls printing by the printhead on the basis of the print data stored in the print buffer.