Juniper EX4300 Series Hardware Manual page 312

• AC and DC power supplies in the same chassis
• Power supplies with different airflow labels (AIR IN (AFI) and AIR OUT (AFO)) in the
same chassis.
• Fan modules with different airflow labels (AIR IN (AFI) and AIR OUT (AFO)) in the
same chassis.
• Power supplies and fan modules with different airflow labels (AIR IN (AFI) and AIR
OUT (AFO)) in the same chassis.
NOTE: We recommend that you connect each power supply 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 left end on 32-port switches.
supply in 24-port or 48-port switches. The procedure is the same for 32-port switches.
To install a DC 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. Attach the ESD grounding strap to your bare wrist, and connect the strap to the ESD point on the
chassis.
3. If the power supply slot has a cover panel on it, loosen the captive screws on the cover panel by
using your fingers or the screwdriver. Hold the captive screw and gently pull it outward to remove
the cover panel. Save the cover panel for later use.
4. Taking care not to touch power supply pins, leads, or solder connections, remove the power supply
from the bag.
Figure 91 on page 303 shows how to install a DC power
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