An oven serves for heat-treating food pieces laid upon a grid in a cabinet by a heat source. The image decoder removes coding distortion in pixels of two adjacent transform blocks which are motion-compensated, having a coded motion compensation error equal to zero, and are located inside a same macroblock. 11 traffic indication map to determine whether traffic for the user device exists. Either the frame or the faceplate are configured for detachable attachment of the coupling device to the faceplate.