High definition (HDTV) SET-TOP The low-cost DCX525e is an all-digital, MPEG-4 set-top designed to provide high-definition video along with digital sound and on-demand and interactive services for the home environment. The ARRIS DCX525e is a high-definition set-top with a single 1 GHz tuner that supports both MPEG-2 and MPEG-4 AVC services. The DCX525e provides the latest HDMI output, award-winning Dolby Digital Plus audio, and Dolby Volume Leveling.