Introduction to PoE
PoE technology allows IP telephones, wireless LAN access points, and other appliances to receive power and
transfer data over existing ethernet LAN cabling. For more information about PoE technology, see the PoE/PoE+
planning and implementation guide, which is available on the HPE Networking website at http://www.hpe.com/
networking. Enter your Switch number.
Additionally, PoE+ provides more power-management capability, allowing the switch to have more power
available for more PDs. Power can be allocated exactly and automatically according to what the PD actually
requires at a given time.
PoE terminology
Power-over-ethernet (PoE) and Power-over-ethernet plus (PoE+ or POEP) operate similarly in most cases. Any
differences between PoE and PoE+ operation are noted; otherwise, the term "PoE" is used to designate both PoE
and PoE+ functionality.
Planning and implementing a PoE configuration
This section provides an overview of some considerations for planning a PoE application. For additional
information on this topic, refer to the HPE PoE/PoE+ planning and implementation guide which is available on the
HPE Networking web site at http://www.hpe.com/networking.
Some of the elements you may want to consider for a PoE installation include:
• Port assignments to VLANs
• Use of security features
• Power requirements
This section can help you to plan your PoE installation. If you use multiple VLANs in your network, or if you have
concerns about network security, you should read the first two topics. If your PoE installation comes close to (or is
likely to exceed) the system’s ability to supply power to all devices that may request it, then you should also read
the third topic. (If it is unlikely that your installation will even approach a full utilization of the PoE power available,
then you may find it unnecessary to spend much time on calculating PoE power scenarios.)
Power requirements
To get the best PoE performance, you should provide enough PoE power to exceed the maximum amount of
power that is needed by all the PDs that are being used.
By connecting an external power supply you can optionally provision more PoE wattage per port and or supply
the switch with redundant 12V power to operate should an internal power supply fail. A Power Supply Shelf
(external power supply) can also be connected to these switches to provide extra or redundant PoE power.
See the HPE PoE/PoE+ planning and implementation guide for detailed information about the PoE/PoE+ power
requirements for your switch.
Chapter 4
Power Over Ethernet (PoE/PoE+) Operation
84 Aruba 2530 Management and Configuration Guide for
ArubaOS-Switch 16.05
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