The following images show the back panel
of the PA-820 and PA-850 Series firewall and the table describes
each back panel component. The only difference between the back
panels of the two firewalls is that the PA-820 has one fixed power
supply and the PA-850 firewall has two hot-swappable power supplies
(the second power supply is for redundancy).
Item
Component
Description
1
Power inputs
Use the power supply input(s) to connect
power to the firewall.
PA-820 firewall—Single fixed
AC power supply and power input.
PA-850 firewall—Two AC power supplies and power inputs.
2
Ground stud
Use the single post ground stud to connect
the firewall to earth ground (ground cable not included).
3
Cooling fans
Fans that provide ventilation and cooling
for the firewall.