Specifications

2-15
Installing the HP 8200 zl Switches
Installation Procedures
Installing the HP 8200 zl
Switches
power supplies installed in the switch. When there are two power supplies
installed in the switch and one should fail, the other power supply can keep
the switch running with the first six module slots operational. The 8212 zl
switch can hold up to four, load-sharing power supplies. Install the second
power supply into power slot number 2, as shown in Figure 2-3. Be sure to use
the same power supplies in any one switch.
The HP 8206 zl switch has full operation on a single power supply. However,
a second, redundant power supply will prevent the switch from losing all
operation should the main power supply fail. The 8212 zl can hold up to two,
load-sharing power supplies. Be sure to use the same power supply model in
any one switch.
The power supply slot covers can be removed with either a flat-bladed or Torx
T-10 screwdriver. Retain the slot covers for future use.
To prevent overloading of the building circuits, the second power supply can
be connected to a different AC power source than the first power supply. This
also helps with redundancy where in the event of one power source failure,
the switch will continue to operate.
Caution The 8200 zl switches are designed to provide continuously operating PoE or
PoE+ power in the event of a single power supply failure with only a loss of
PoE power to lower priority ports.
If more than one power supply fails while the switch is at or near maximum
operating power (that is: the sum total of all PoE or PoE+ supply capacity
minus the largest supply, see chapter 2 and 4 of the HP Power over Ethernet
(PoE/PoE+) Planning and Implementation Guide) loss of all PoE or PoE+
power may result.
To return PoE or PoE+ power to the ports without causing the switch to
reboot, when there are two or more power supplies still supplying 12V power,
unplug the power cord for 5 seconds and re-plug it for each power supply one
at a time.