the procurve switch fl redundant power supply operates between 100–240 vac. each component (management module, interface module, and so on) regulates its own power needs. the switch 8108fl requires one power supply to operate a fully-populated chassis—an optional second power supply provides for redundancy. for the switch 8116fl, two power supplies are required to operate a fully-populated chassis—an optional third power supply provides for redundancy.