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HP ProCurve 2520 Planning And Implementation Manual: Power Redundancy For The 3500yl Poe+ Switches

Procurve power over ethernet (poe/poe+).
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Introduction
PoE Capabilities of the Products
The HP ProCurve Switch 3500yl-24G-PoE+ (J9310A), 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:
For more information, refer to the Management and Configuration Guide
which is on the ProCurve Web site. To display the list of downloadable
manuals, click on the following link: www.hp.com/go/procurve/manuals.
(You may want to bookmark this Web page for easy access in the future.)
The dual-personality ports have either auto-sensing 10/100/1000Base-T RJ-45
or mini-GBIC connectivity. The mini-GBIC ports do not support PoE. If any of
the mini-GBIC ports are used the corresponding RJ-45 port will not be supplied
with PoE power.

Power Redundancy for the 3500yl PoE+ Switches

The internal power supply in these switches provides both the 12V (RPS) and
54V (EPS) circuits. If the 54V 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 54V circuits. It is recommended
that both EPS and RPS be connected to provide full redundancy.
The 3500yl-PoE+ Switches can be connected to an HP ProCurve 630 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. The HP ProCurve
630 RPS/EPS unit can provide all the power necessary to keep only one switch
running.
The "maximum PoE+" power for 48 ports equals (48 ports x 30 watts = 1440
watts). The 398 watts of internal power plus the 382 watts from the EPS equals
780 watts. This will only support "maximum PoE+" power on 24 of the 48 ports.
The internal power supply can only support "maximum PoE+" on 12 of 48 ports
(or 12 of 24 ports on 24 port PoE+ switch).
1-16
ProCurve(config)# no power pre-std-detect

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