Juniper Networks EX8208 - Manual (Page 67)

Figure 25: AC Power Supply
Each AC power supply comes with a power retainer that holds the power cord in place.
See Figure 26 on page 41. The power retainer has a clip and an adjustment nut. The
L-shaped ends of the clip hook into the bracket holes on each side of the AC appliance
inlet on the faceplate. The adjustment nut holds the power cord in the correct position.
For instructions for installing the power retainer, see “Connecting AC Power to an EX8200
Switch” on page 173.
Figure 26: Power Retainer for an AC Power Supply
Each power supply connects to the backplane in an EX8208 switch and to the midplane
in an EX8216 switch. The backplane and the midplane distribute the output power
produced by the power supplies to different switch components. Each AC power supply
provides power to all the components in the switch.
Each power supply has its own fan and is cooled by its own internal cooling system. The
airflow is from the front of the power supply to the back. Hot air exhausts from the rear
of the chassis.
EX8200 switches support both 2000 W AC power supplies and 3000 W AC power
supplies.
The 2000 W AC power supply supports both the low-voltage line (100–120 VAC) and
the high-voltage line (200–240 VAC) AC power configurations. In both cases, the output
41 Copyright © 2010, Juniper Networks, Inc.
Chapter 2: Component Descriptions