HP Power over Ethernet (PoE/PoE+) Planning and Implementation Guide

11-3
Planning and Implementation for the HP 3500-PoE yl Switches
Introduction
The HP 3500-24G-PoE+ yl Switch (J9310A) has 20 PoE-integrated 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 enabled by
default. If you do not want to use it, you must disable it by issuing the following
command via the switch CLI:
HP Switch (config)# no power pre-std-detect
For more configuration information, refer to the Management and
Configuration Guide for your switch at www.hp.com/networking/support. Auto
search on “3500”, select your switch model from the list, and click Display
selected. Then click on the links that have “Manuals” in them to get to the web
page that lists the available manuals.
Note The dual-personality ports have either auto-sensing 10/100/1000Base-T RJ-45
or SFP connectivity. The SFP ports do not support PoE. If any of the SFP ports
are used, the corresponding RJ-45 port will not be supplied with PoE power.
Power Redundancy for the HP 3500-PoE+ yl 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 HP 3500-PoE+ yl Switches can be connected to an HP 630 RPS/EPS
(J9443A) 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 630
RPS/EPS unit can provide all the power necessary to keep only one switch
running.
If maximum PoE+ power is to be used on all 48 ports, it becomes necessary
to connect a HP 630 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.