Sun Microsystems StorageTek StreamLine SL8500, System Assurance Manual

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E24254-01 Chapter 1 Introduction 11
Introduction
2N Power Configuration
The 2N power configuration is an optional feature that connects another AC
power source to a second “system” power distribution unit that should attach to
a separate branch circuit.
Each system PDU delivers AC power to its own group of load sharing power
supplies to provide
both AC and DC power redundancy.
• If something within an AC power source fails, the second AC power source
supplies power to the entire system except the operator panel if AC1 fails.
• If a DC power supply fails, there is still enough power available to keep the
entire system operational until the power supply can be replaced.
This configuration provides power to the same components as N+1, plus :
- Power for the additional 2N load sharing power supplies (required)
- Power for 2 additional 19-inch racks (1 & 3) each with six outlets
- Power for the redundant AC-to-DC converters for the ECM
Figure 6. 2N Power Configuration (Optional Feature)
Redundant
Electronics