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Power System features The High-Performance Process Manager Power System provides • 24 Vdc power for operation of all HPMM cards, IOP cards, and FTAs • A nominal 3.6 Vdc battery output for backup of the HPMM and IOP memory circuits. • A nominal 0.25 ampere, 6 Vac output for operation of a LLAI line frequency clock circuit. Two types of Power Systems There are two types of Power Systems. • Standard Power System • AC Only Power System Standard Power System The Standard Power System has many features that include • An optional redundant Power Supply Module (model MU-PSRX03/04). • Either 120 Vac or 240 Vac input power. A single or dual source of input power can be connected when the optional redundant Power Supply Module option is implemented. • Single and redundant Power Supply Module failure detection. • CMOS memory NiCad battery backup (3.6 Vdc) for 12 hours (model MU-PSRX03) or 45 hours (model MU-PSRX04) backup with failure detection. • An optional 48 Vdc Battery Backup Module (model MU-PSRB03/04) with a disconnect switch that backs up the 24 Vdc for 25 minutes. Redundant Power Supply Modules Redundant Power Supply Modules are recommended when the Power System provides power for redundant HPMMs. If the redundant HPMMs are resident in separate cabinets with their own Power System, a Power System with a single Power Supply Module is acceptable, though not fully recommended.