A communications system may include a plurality of communications buses, at least one bus device connected to the plurality of communications buses, and a plurality of bus controllers for sending a plurality of bus enable signals to the at least one bus device. A locking recess is defined in one corner portion at adjacent interconnected walls, and a mating locking protuberance is carried at a diametrically and vertically opposite corner portion allowing units to be stacked upon one another forming a continuous medial channel extending therethrough. The urging portion includes a leading end that pressingly contacts one axial-direction end portion of the lock plate and urges the lock plate toward the other axial-direction end. The flat wrench plate is mounted within and at one end of a short, hollow handle. The long-term prediction mode is tailored to where the generally periodic component of the speech is generally not stationary or less than completely periodic and requires greater frequency of updates from the adaptive codebook to achieve a desired perceptual quality of the reproduced speech under a long-term predictive procedure. The device also includes structure that, in a designated position, prevents the casing from rotating, interacting with the casing and an actuator for actuating the structure.