HP J2962A, Installation And Reference Manual

Page: 17 / 36

Frequently Asked Questions
The following table lists questions and answers about the Redundant Power
Supply:
Question Answer
What is the difference between a UPS and an RPS? A UPS (Uninterruptible Power Supply) is an external
power backup device. The UPS serves as a battery
backup, so that if your AC power source fails (as in a
brownout or blackout), the UPS will still provide power. To
order an HP UPS, call 1-800-538-8787.
An RPS (Redundant Power Supply) is an internal power
backup device. Each component of an RPS is duplicated
(redundant), so that if one power supply component fails
the RPS will still provide power.
Should I keep my device’s AC power cord connected? No. This configuration is not supported by HP.
I have only one device connected to the RPS. What would
happen if I connected only one AC power cord to the RPS? You will have redundant DC power but not redundant AC
power.
If I connect a DC cable to DC Power Output 1 and an AC
power cord to AC Power 2 , will the device receive power?
Yes. However, you should connect both RPS AC power
cables to two separate AC power sources for maximum
redundancy.
If I connect two devices to the RPS, do I have to use any
particular DC output connectors? No. Pick any two DC Output connectors.
Do I have to plug both AC power cords into different AC
power sources? We recommend that you connect each AC power cord to
a different AC power source but it is not required.
How the RPS Works
11