17.5 (H) x 17 (W) x 19.68(D), Holds 12, 6U x 160mm Cards, 12 Slot VME or VME64x Backplane,6 x 5.25 HH Devices, 2 x 114 CFM, 12V DC Fans 500W: +5V/80A; +12V/10A; -12V/10A, or 600W: +5V/75A; +12V/12A; -12V/4A; 3.3V/40A
VXS,7(H) x 17(W) x 15.75"(D),Holds 5, 6U x 160mm Cards,5 Slot VXS Dual Star Backplane, No Device Mounting,1 x114 CFM Fan, 250W: +5V/35A; +12V/18A; -12V/1A;3.3V/38A
1.75(H) x 17.5(W) x 12(D),Holds 2, 6U x 160mm Cards, 2 Slot VME or VME64x Backplane, No Device Mounting, 3 x 8 CFM Fans, 250W: +5V/40A; +12V/5.5A; -12V/1.5A; 3.3V/40A,Rear I/O