A system for absorbing impact energy includes a container formed with a plurality of faces, wherein the container is attached to a vehicle. The external placement of the thermal sensor does not require replacement of the entire magnetic coil, yielding less expensive replacement of a failed thermal sensor. The coefficient data at the respective stages are combined by the combining means to obtain coefficient data for the block. If it is determined that items are missing from the sorted sequence a placeholder may be inserted to mark the place of missing items. In a third aspect, jammer detect information is used to determine the comparison reference clock signal frequency.