Juniper EX4300 Series

Installing an AC Power Supply in an EX4300 Switch
Before you install an AC power supply in the switch:
• Ensure you understand how to prevent electrostac discharge (ESD) damage. See Prevenon of
Electrostac Discharge Damage .
Ensure that you have the following parts and tools available to install the power supply:
• ESD grounding strap
• Phillips (+) screwdriver, number 2
The AC power supply in EX4300 switches is a hot-removable and hot-insertable eld-replaceable unit
(FRU) installed in the rear panel of the switch: You can remove and replace it without powering o the
switch or disrupng switch funcons.
CAUTION: Do not mix:
• AC and DC power supplies in the same chassis
• Power supplies with dierent airow labels (AIR IN (AFI) and AIR OUT (AFO)) in the
same chassis.
• Fan modules with dierent airow labels (AIR IN (AFI) and AIR OUT (AFO)) in the
same chassis.
• Power supplies and fan modules with dierent airow labels (AIR IN (AFI) and AIR
OUT (AFO)) in the same chassis.
NOTE: Each power supply must be connected to a dedicated power source outlet.
The power supply slots are at the right end of the rear panel on 24-port and 48-port switches,
and at the le end on 32-port switches. Figure 89 on page 299 shows how to install an AC
power supply in 24-port or 48-port switches. The procedure is the same for 32-port switches.
To install an AC power supply in the switch:
1. Ensure that you have the correct power supply. The label AIR IN (AFI) or AIR OUT (AFO) on the
power supply must match the label AIR IN (AFI) or AIR OUT (AFO) on the installed fan module.
2. Aach the ESD grounding strap to your bare wrist, and connect the strap to the ESD point on the
chassis.
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