Model: 1091008 he power supply provides the various DC voltages required to power the DSX-80/160 Cards. The DSX-80 4-Slot KSU requires a single power supply. The DSX-160 8-Slot KSU requires up to 3 power supplies, depending on system configuration. * DSX-80 Qty: 1 * DSX-160 Qty: 3 (max.) *Quantity required in DSX-160 determined by System Load Factor. *In DSX-160, Install one power supply for every two 16ESIU Cards.