A NuBus Expansion Chassis.Slot Architecture: 12 Nubus w/internal ID switchesCable length: 1 foot (use only this cable).Power: 100-240 VAC (Auto switch power supply) 50/60hz, 220watts, 4`Amp load *(see note)Dimensions: 4-U rack mount 19" W x 7" H x 20" D (48.3 x 17.8 x 50.8cm).Front Handle clearance: 1.25" (3.2 cm).Weight (empty): 27 lbs (12.25 kg).Weight (loaded): 52 lbs (24 kg) - All slots full.Chassis/cards under serial #220 need to be modified for reliability. Contact Digidesign to determine modification status.*(Do not use the AC plug, reserved for the monitor, on the back of the Mac as a power supply for the chassis. The Amp load of the Expansion chassis exceeds the max load spec of this connection on the Mac which may lead to damage on cards installed in the Expansion Chassis.)