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

12-3
Planning and Implementation for the HP 3800-PoE+ Switches
PoE Provisioning
Power Redundancy for the HP 3800-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.
The HP 3800-PoE+ Switches can have a second power supply installed and
can support full redundant power should the primary power supply fail. The
second power supply can provide all the power necessary to keep the switch
running.
If maximum PoE+ power is to be used on all 48 ports, it becomes necessary
to install a second power supply, since a single power supply only has enough
power to supply 24 ports with maximum wattage. In this case, there is no
redundancy. For detailed information on the power supplies see the HP 3800
Switches Installation and Getting Started Guide at www.hp.com/networking/
support. Auto search on “3800”, 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.
PoE Provisioning
The HP 3800-24G-PoE+-2SFP+ Switch, HP 3800-24G-PoE+-2XG Switch, HP
3800-48G-PoE+-4SFP+ Switch, and HP 3800-48G-PoE+-4XG Switch have 24 or
48 ports respectively and depending on how many power supplies are installed
and to what voltage the power supply is connected to, either 110 or 220 volts,
can supply up to 1080 watts of PoE+ power across all RJ-45 ports for PoE+
applications compatible with the IEEE 802.3at standard.
■ If the power supply is connected to 110 volts, then the power supply will
supply 700 watts to the switch.
■ if the power supply is connected to 220 volts, then the power supply will
supply 1000 watts to the switch.
For detailed information on the power supplies, see the HP 3800 Switches
Installation and Getting Started Guide at www.hp.com/networking/support.
Auto search on “3800”, 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.