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

14-3
Planning and Implementation for the HP 5400R zl2 Switches
Introduction
Power Redundancy for the HP 5400R zl2 Switches
There are two types of power supplied by the HP 5400R zl2 switch power
supplies:
■ 12V power or system power
■ 54V power for PoE/PoE+ power
The 12V system power is used to operate the internal components of the
switch. The 54V PoE/PoE+ power is used to power the PoE devices connected
to the modules.
It is important to provide a secondary power supply for redundancy purposes
for both the 12V and 54V circuits. The internal power supply in these switches
provides power to both the 12V (system) and 54V (PoE+) circuits. If the 12V
(system) power fails the switch will shut down. If the 54V fails, all PDs would
lose power. Therefore, to keep the switch running should one power supply,
or either power source fail, you should install a second power supply.
The HP 5406R zl2 Switches can hold two internal power supplies and the HP
5412R zl2l Switches can hold four internal power supplies.
PoE/PoE+ Chassis Switch zl2 Power Supplies
Mixing Power Supplies in chassis
Mixing power supplies is supported but not recommended as redundancy
cannot be configured for unlike power supplies.
The J9830A zl power supply provides PoE/PoE+ power at 54 V (2500 W at 115-
127v and also at 200-240 V). If you install a J9828A or J9829A with a J9830A
power supply, they do voltage sharing.
Note: All three power supplies- J9828A, J9829A, and J9830A support POE+ power.
If more than one power supply is connected, they provide 92.5% of the total
power. For Example,
■ J9828A provides 254 W (275*92.5%)
■ J9829A provides 832 W (900*92.5%)
■ J9830A provides 2312 W (2500*92.5%)
All the system power usage for the blades takes precedence and the remainder
power is given to the PoE+ pool.
For PoE/PoE+ only, the following power supplies can be used: