Superdome Servers - I/O Expansion Cabinet Guide, Fifth Edition

Chapter 1
Introduction
Overview
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The power subsystem has n+1 redundancy for the AC-to-DC conversion and the AC inputs. AC-to-DC n+1
redundancy is achieved with two BPSs, any one of which can support the load. AC input redundancy is
achieved with two single-phase AC power cords connected to dual (n+1) primary power grids, either one of
which can support the load.
Figure 1-7 XPC Location
A BPS is a modular, hot swappable, power supply that is installed into an XPC slot. Each BPS is configured as
an n+1 redundant, hot swappable, current sharing, and modular power supply within the power subsystem.
Each BPS is capable of operation in an AC-power load share mode (n+1), where both AC sources, if present,
are equally loaded. If one AC source is absent or out or range, operation continues from the second AC source.
This is a transparent operation.
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