PoE/PoE+ Planning and Implementation Guide 2011-09

1-12
Introduction
PoE Capabilities of the HP Products
These switches also support some pre-standard PoE devices. While HP strives
to support as many non-standard devices as possible, some devices in the
market are designed in ways that are restrictive, or exclusive of the IEEE
standard and thus cannot be supported. For a list of these devices, see the
FAQs for your switch model at www.hp.com/networking/support, and click on
faqs. This feature is the default and you must disable it if you do not want to
use it. For example:
ProCurve 2910al#(config) no power pre-std-detect
For more information, refer to the Management and Configuration Guide
for your switch at www.hp.com/networking/support.
(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/PoE+ power.
Power Redundancy for the 2910al 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.
HP Redundant/External Power Supplies (RPS/EPS) can be connected to the
2910al Switches for redundant 12 V system power (RPS) and to provide for
additional PoE+ provisioning. For RPS power, the 2910al Switches can be
connected to either an HP 620 RPS/EPS (J8696A) or HP 630 RPS/EPS
(J9443A). For additional PoE+ EPS power, only the 630 can be used. The 620
does not provide 54 V for PoE+, only 50 V for PoE, and the 2910al Switches
do not support connections to the 620 for EPS.
The 2910al switch provides up to 30W from each port (25.5W for PD, 4.5W for
cable dissipation); the number of ports that can be operated at full power is
limited to 12 ports at full power, and/or 24 ports at 15.4W. To increase the
capacity of the switch, an external power supply can be attached to double
the total system capacity to 24 ports at 30W, or 48 ports at 15.4W.
The power supplies for these switches are optimized to provide the most
efficient and cost effective solution.