H3C Technologies H3C S5800 Series Switches - Manual (Page 2)

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NOTE:
•
The RPS500-A3 and RPS 800-A can provide selective DC power supply to the powered device (PD)
depending on the connected DC output cable(s).
• Currently, when working as an external power supply system for low-end Ethernet switches, RPS500-A3
or RPS800-A does not use concurrent –50 V/–54 V and +12 V outputs.
• The RPS1000-A3 and RPS1600-A can feed multiple devices at the same time. The number of PDs that
the RPS unit can support is determined by the power consumption of the PDs and the maximum output
power of the RPS unit. The total power consumption contributed by all the PDs must not exceed the
maximum output power of the RPS. For more information about the output distribution of the
RPS1000-A3 and RPS1600-A, see
RPS1000-A3 User Manual and RPS1600-A User Manual.
RPS Working Mechanism
An RPS unit can serve as a redundant backup power supply unit for switches:
• If using the same AC power source with a PD, when the internal power supply system of the PD fails,
the RPS unit can automatically provide DC supply to the PD, thus ensuring uninterrupted operation
of the PD.
• If using a different AC power source from a PD, when the AC power source to the PD fails, the RPS
unit can automatically provide DC supply to the PD, thus ensuring uninterrupted operation of the PD.
In addition, the RPS1000-A3 and RPS1600-A can provide heavy-duty PoE supply to Ethernet switches.
RPS power supplies of different models work differently. More specifically:
• The RPS1000-A3/RPS1600-A supports hot backup of power supply. When the power supply
systems of the PDs operate normally, the RPS1000-A3/RPS1600-A also provides part of the power
feed to the device. When the power supply system of a PD fails, the RPS1000-A becomes an
independent power supply system to feed that PD.
• The RPS500-A3/RPS800-A supports cold backup of power supply. The RPS500-A3/RPS800-A
switches to the DC output state only when it detects a power supply failure of the PD. When the PD’s
own power supply system is functioning, the RPS unit only works in monitoring mode, without
feeding power to the PD.
NOTE:
•
The output of the RPS500-A3 or RPS800-A is controlled by a control pin. When the PD’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 DC output state within 2 ms.
• For some models of PDs, the control pin of the RPS500-A3 or RPS800-A can be controlled through a
special cable to support hot backup of power supply.
DC Output Cables
DC Output Cables for RPS500-A3 and RPS800-A
Table 2 lists the output cables that the RPS500-A3 and RPS800-A use to feed H3C low-end series
Ethernet switches. All these cables are optional accessories.