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

10-2
Planning and Implementation for the HP 3500-PoE Switches
PoE Provisioning
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 10/100Base-TX 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 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 3500-PoE Switches can be connected to an HP 620 RPS/EPS (J8696A)
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 HP 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
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.
PoE Provisioning
■ The 3500-24-PoE Switch can supply up to 398 watts of PoE power across
ports 1-24 ports for PoE applications compatible with the IEEE 802.3af
standard and some pre-standard devices.
■ The 3500-48-PoE Switch can supply up to 398 watts of PoE power across
ports 1-48 for applications compatible with the IEEE 802.3af standard and
some pre-standard devices. This only allows half the per-port wattage as
is available on the 3500-24-PoE switch.