IBM NeXtScale System Planning And Implementation Manual page 138

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Figure 5-2 Sample power cabling: Six chassis and six switches
With 6U of rack space left open, it is possible to put six 1U devices in the rack
and provide two independent power connections to each device. This
configuration can provide power redundancy to the chassis, servers, and optional
devices that are installed in the rack, depending on the specifications of the
equipment.
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IBM NeXtScale System Planning and Implementation Guide
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Rear of NeXtScale Chassis 6
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