Channels are formed that pass through an active surface of a semiconductor substrate to provide isolation between adjacent active surface regions defining individual die locations. The prop further includes a bearing plate positioned at the first end of the yieldable prop, wherein the bearing plate is selected from a shape comprising planar and volcano. A stitching wire fastened at the cushion cover can thus be connected to the counter-retainer in a load-transmitting manner. The Bragg grating may be a phase change grating with individual sections being reduced in strength by line removal. An attack detection engine within the device analyzes the temporary packets to detect any network attacks carried by the encapsulated data units.