A fiber optic cassette includes a body defining a front and an opposite rear. The apertures are arranged in circumferentially distributed fashion in the region of a ring of the circular and disc-shaped basic form. The monitoring device refers to frames received by a predetermined communication device and having the ID appended thereto, and tallies an amount of data for frames for each number of relaying communication devices. The housing can be connected to adjacent components in a leakproof manner, and connections for engine crankcase ventilation or fuel tank ventilation can be integrated into the housing. The element exhibits a predetermined output state subsequent to suppression of the eroded signals. The heat transfer-emitter unit comprising a chamber enclosure made of a high temperature resistant material, defining a flow-through heat transfer chamber ; an electro-magnetic radiation emitter configured for emitting predominantly near-infrared radiation when exposed to high temperatures.