HP Power over Ethernet (PoE/PoE+) Planning and Implementation Guide

14-17
Planning and Implementation for the HP 5400R zl2 Switches
Configuration Examples
In this example the load must be balanced or split between two or three
modules in order to effectively use all 508 watts. The number of devices and
wattage must be split between the modules. This would also help limit the
effects of a single module failure. If one module fails, only the devices on that
module would lose power.
Alternatively, one power supply could be used to supply PoE power at 275
watts and the other power supply could be held in reserve as a secondary
power supply if the primary power supply fails. If both power supplies are
connected to different power sources, one could backup the other in case of
failure. With this option the user must manage the PoE usage in order to
maintain redundancy.
Connecting a fully loaded external power supply can double the available PoE
power. See page 14-23.
In this example (Figure 14-4) there is one J9829A power supply supplying 900
watts for PoE usage. Compared to the J9828A, one J9829A power supply can
supply more PoE wattage than two J9828As.
Figure 14-4. Example of a HP 5406R zl2 with one power supply, J9829A
The following table shows the label and description for HP 5406R zl2 with one
power supply, J9829A:
Label Description
1 Front
2 Power Supply J8929A
3 Back