PoE/PoE+ Planning and Implementation Guide 2011-09

1-18
Introduction
PoE Capabilities of the HP Products
The HP E3800-48G-PoE+-4XG Switch (J9588A), has 48 Integrated PoE auto-
sensing 10/100/1000Base-T RJ-45 ports with four XG ports.
The E3800-24G-PoE+-2XG Switch (J9587A), has 24 auto-sensing 10/100/1000-
T RJ-45 ports and two XG 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 disabled by default
and must be enabled to use it. For more information, refer to the Management
and Configuration Guide for your switch at www.hp.com/networking/support.
Power Redundancy for the E3800 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 E3800 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 E3800
Switches Installation and Getting Started Guide. For information on PoE/
PoE+ usage see Chapter 12 “Planning and Implementation for the E3800
Switches” of this manual.