A video signal shuffling device forms a segment with blocks having a given offset value in horizontal and vertical directions from a given starting point uniquely determined on the screen, the offset value being identical in every region. A test case generator generates a test case that includes an initial set of test case effective addresses, an initial set of ESIDs, and an initial set of VSIDs. In addition, the lower pulley can also function as a wheel for transporting the apparatus. The host system communicates with the network processor to detect the packet media streams from the captured packets and to analyze the detected packet media streams. Downhole tool transducers accumulate the data and transmit the same to the surface.