PoE/PoE+ Planning and Implementation Guide 2011-09

9-1
9
Planning and Implementation for the 2910al
PoE+ Switches
This chapter discusses the planning process a user should follow to
successfully implement PoE+ using a Series 2910al Switch. After
understanding what PoE+ is and its operating rules, the next step to
implementation is planning. See “General Considerations” page A-1, for an
example list of considerations during the planning phase.
Planning Your PoE Configuration
This section assists you in building a PoE+ configuration. Using the following
examples you can plan, build, and connect PoE+ devices quickly and easily.
There are four configurations:
■ HP ProCurve 2910al-24G-PoE+ Switch
■ HP ProCurve 2910al-24G-PoE+ Switch connecting an external power
supply
■ HP ProCurve 2910al-48G-PoE+ Switch
■ HP ProCurve 2910al-48G-PoE+ Switch connecting an external power
supply
Each example shows a complete configuration. A table shows the PoE+ power
available to connected PoE+ devices when using just the switch and when
connecting an external power supply.
Once you have selected your specific configuration and the PoE+ power
provided, you then add up the maximum amount of power each device
requires (use maximum power in watts, usually found on a product’s data
sheet). Adjust this total maximum power figure by adding 16% to account for
possible line loss. This value must be less than the maximum power available
shown in the table for your configuration.