PoE/PoE+ Planning and Implementation Guide 2011-09

12-2
Planning and Implementation for the E3800 Switches
Planning Your PoE or PoE+ Configuration
■ HP E3800-48G-PoE+-4SFP+ Switch, or HP E3800-48G-PoE+-4XG Switch,
with one power supply
■ HP E3800-48G-PoE+-4SFP+ Switch, or HP E3800-48G-PoE+-4XG Switch,
with two power supplies
Each example shows a complete configuration. A table shows the PoE or
PoE+ power available to connected PoE or PoE+ devices when using one or
two power supplies in the switch. Only the 1000 watt power supply can be
used for PoE/PoE+ applications. The power supplied by the power supply
depends upon what voltage is applied to it and into which switch the power
supply is installed.
■ When supplied with 110 V, the power supply runs at a max of 700 W:
• When the power supply is installed in the HP E3800-24G-PoE+-2SFP+
or HP E3800-24G-PoE+-2XG Switch, 127 W is reserved for system
operation leaving 573 W for PoE/PoE+ operation. When a second
power supply is installed the total amount of wattage can be allocated
for PoE/PoE+ operation. In this case, with the combined 700W and
573W supplied, up to 1080 W for PoE/PoE+ operation is available.
• When installed in the HP E3800-48G-PoE+-4SFP+ or HP E3800-48G-
PoE+-4XG Switch, 185 W is reserved for system operation leaving 515
W for PoE/PoE+ operation. When a second power supply is installed
the total amount of wattage can be allocated for PoE/PoE+ operation
up to 1080 watts. Limiting the total number of PoE+ ports to 36.
■ When supplied with 220 V, the power supply runs at a max of 1000 W:
• When the power supply is installed in the HP E3800-24G-PoE+-2SFP+
or HP E3800-24G-PoE+-2XG Switch, 127 W is reserved for system
operation leaving 873 W for PoE/PoE+ operation. When a second
power supply is installed the total amount of wattage can be allocated
for PoE/PoE+ operation up to 1080 watts.
• When installed in the HP E3800-48G-PoE+-4SFP+ or HP E3800-48G-
PoE+-4XG Switch, 185 W is reserved for system operation leaving 815
W for PoE/PoE+ operation. When a second power supply is installed
the total amount of wattage can be allocated for PoE/PoE+ operation
up to 1080 watts. Limiting the total number of PoE+ ports to 36.
Once you have selected your specific configuration and the PoE or 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.