PoE/PoE+ Planning and Implementation Guide 2011-09

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Planning Considerations
This appendix is divided into five sections:
■ General Considerations
■ Specific Considerations for the 2910al-PoE Switches
■ Specific Considerations for the 3500-PoE Switches
■ Specific Considerations for the 3500yl-PWR Switches
■ Specific Considerations for the E5400zl/E8200zl Switches
These lists are in no way exhaustive, however answers to these and other
questions will help define how many and what types of switches are needed
to implement a PoE configuration.
General Considerations
The following is an example list of considerations during the planning phase
no matter which series of switches are being installed:
■ How many devices need PoE power?
■ What devices will need PoE power?
■ How much power will each device require, in watts?
■ What is the total of all their wattages?
■ Will the devices be connected to a 2910al, 3500yl, E5400zl or to a E8200zl
switch?
■ How many ports are needed?
■ How many ports are available?
■ Are the devices to be powered by PoE power supported?
• The HP Switches covered in this manual support any products that
meet the IEEE 802.3at standard and the IEEE 802.3af PoE standard
and some pre-standard PoE devices. For a current list, see the FAQ
page for your switch, which can be found at
www.hp.com/networking/support.
■ How many PDs per Switch?
• The number of PDs supported per switch depends on the power
allocation and how much power each PD uses and how much power
is left. The examples in the following section show the power
consumption in some typical configurations.