H3C Technologies H3C S5800 Series Switches - Manual (Page 5)

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Product overview
Introduction
The RPS800-A is an external DC power supply that uses AC input and
provides DC output for multiple switch and router models as a
redundant backup power supply system.
The RPS800-A supports cold backup of power supply, which means that
the RPS800-A only switches to the RPS output state when it detects a
power supply failure of the powered device. When the powered
device’s own power supply system is functioning, the RPS only works in
the monitoring mode, without feeding power to the powered device.
The output of the RPS800-A is controlled by a control pin. When the
powered device’s own power supply system fails, a LOW signal is sent
to the control pin of the RPS unit. Upon receiving this LOW signal, the
RPS unit switches to the RPS output state within 2 ms.
If using the same AC power source with the powered device, the
RPS800-A can timely provide DC supply to the powered device when
the internal power supply system of the powered device fails.
If using a different AC power source from the powered device, the
RPS800-A can timely provide DC supply to the powered device when
the AC power source to the device fails, thus ensuring uninterrupted
operation of the device.