Rack-mount or benchtop 505 Series incorporates twenty-one 6U x 160 mm front-access slots and twenty-one 6U x 80 mm rear transition slots. Backplane supports 64-bit CompactPCI architecture; provides coding keys for selectable +5 or +3.3 Vdc I/O; offers telephony busing with or without H.110; and achieves low-noise, high-speed transfer rates. It supports various peripheral drives, including 6U peripheral shuttles.