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HP ProCurve 2520 Planning And Implementation Manual: Power Redundancy For The 2600 And 2610 Switches

Procurve power over ethernet (poe/poe+).
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Introduction
PoE Capabilities of the Products

Power Redundancy for the 2600 and 2610 Switches

The internal power supply in these switches provides both the 12V (RPS) and
50V (EPS) circuits. If either the 12V or 50V fails, the power supply shuts down
which will bring down all switch and PoE connections. Therefore it is
important to provide a redundant power supply for both the 12V and 50V
circuits. Thus when you connect EPS from a 600 RPS/EPS device to one of
the 2600-PWR Switches or one of the 2610-PWR Switches, you should also
connect the RPS as well to provide full redundant power.
The 2600-PWR Switches and 2610-PWR Switches can be connected to a 600
RPS/EPS and receive full redundant power from the RPS part of the unit for
switch operation, if the internal power supply in the switch fails. If multiple
switches are connected to the RPS ports and several switches lose power at
the same time, the switch attached to the lowest RPS port number receives
power. The 600 RPS/EPS unit can provide all the power necessary to keep one
switch running.
EPS power from the 600 RPS/EPS is the PoE capability of the device. It
supplies backup and additional PoE power for the ports of the 2600-PWR and
2610-PWR switches.
The 610 EPS can also be used for this purpose, to supply PoE power only. The
610 EPS cannot supply RPS power, it can only supply PoE power. Refer to
chapter three, four, and five for more information on capabilities and
connectivity of these switches, components and accessories.
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