Installing a DC Power Supply in an EX4300 Switch
Before you install a DC power supply in the switch:
Ensure you understand how to prevent electrostatic discharge (ESD) damage. See Prevention of Electrostatic Discharge Damage.
Ensure that you have the following parts and tools available to install a DC power supply in the switch chassis:
ESD grounding strap
Phillips (+) screwdriver, number 2
The DC power supply in EX4300 switches is a hot-removable and hot-insertable field-replaceable unit (FRU) installed in the rear panel of the switch: You can remove and replace it without powering off the switch or disrupting switch functions.
Do not mix:
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.
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. Figure 1 shows how to install a DC power 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:
- 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.
- Attach the ESD grounding strap to your bare wrist, and connect the strap to the ESD point on the chassis.
- 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.
- Taking care not to touch power supply pins, leads, or solder connections, remove the power supply from the bag.
- Using both hands, place the power supply in the power supply slot on the rear panel of the switch and slide it in until it is fully seated and the ejector lever fits into place.
If you have a Juniper J-Care service contract, register any addition, change, or upgrade of hardware components at https://www.juniper.net/customers/support/tools/updateinstallbase/ . Failure to do so can result in significant delays if you need replacement parts. This note does not apply if you replace existing components with the same type of component.