H3C Technologies H3C S5800 Series Switches - Manual (Page 6)

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NOTE:
For some models of powered devices, the control pin of the
RPS800-A can be controlled through a special cable to support hot
backup of power supply. When the power supply systems of the
powered devices operate properly, the RPS unit also provides part
of the power feed to the devices; when the power supply system of a
powered device fails, the RPS unit becomes an independent power
supply system to feed that powered device.
Features
The RPS800-A can provide selective DC outputs. Depending on the
connected DC output cable(s), the RPS unit can provide +12 VDC or
–54 VDC power supply to the powered device, or +12 VDC and –54
VDC outputs concurrently to the powered device.
NOTE:
As optional parts for the RPS800-A, different types DC output cables
are available depending on the requirement of the powered device.
For more information about the DC output cables, consult H3C
marketing or customer service staff.