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HP ProCurve 2520 Planning And Implementation Manual: Power Redundancy For The 3500 Switches; Hp Procurve 3500yl-pwr Switches

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

Power Redundancy for the 3500 Switches

The internal power supply in these switches provides both the 12V (RPS) and
50V (EPS) circuits. If the 50V portion of the power supply fails, it will only shut
down the PoE connections. However, if the 12V portion of the power supply
fails, it will shut down the entire switch. Therefore it is important to provide
a redundant power supply for both the 12V and 50V circuits. It is recommended
that both EPS and RPS be connected to provide full redundancy.
The HP ProCurve 3500-PoE Switches can be connected to a 620 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 two switches are connected
to the RPS ports and both switches lose power at the same time, they both
receive redundant power. The 620 RPS/EPS unit can provide all the power
necessary to keep two switches running.
If maximum PoE power is to be used on all 48 ports, you must connect an HP
ProCurve 620 RPS/EPS, since the internal power supply only has enough
power to supply 24 ports with maximum wattage. In this case, there is no
redundancy.

HP ProCurve 3500yl-PWR Switches

The HP ProCurve Switch 3500yl-48G-PWR (J8693A), has 44 Integrated PoE
auto-sensing 10/100/1000Base-T RJ-45 ports with four dual-personality Gigabit
Uplink ports.
The HP ProCurve Switch 3500yl-24G-PWR (J8692A), has 20 Integrated PoE
auto-sensing 10/100/1000Base-T RJ-45 ports with four dual-personality Gigabit
Uplink ports.
These switches also support some pre-standard PoE devices. For a list of these
devices, see the FAQs for your switch model. This feature is the default and
you must disable it if you do not want to use it. For example:
1-14
ProCurve(config)# no power pre-std-detect

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