Characteristics Of A Dc Power Supply - Juniper QFX5110 Series Hardware Documentation

NOTE: EX4300-24T, EX4300-24P, EX4300-32F, EX4300-48T, EX4300-48T-AFI, EX4300-48P,
EX4300-48MP, and EX4300-48MP-S models do not support DC power. EX4300-24T-S,
EX4300-24P-S, EX4300-32F-S, EX4300-32F-DC, EX4300-48T-S, EX4300-48T-DC,
EX4300-48T-DC-AFI, and EX4300-48P-S models support DC power.
All the EX4300 switches that are powered by DC power supplies except EX4300-24T-S, EX4300-24P-S,
EX4300-32F-S, EX4300-48T-S, and EX4300-48P-S switches are shipped with one DC power supply
installed in the rear panel of the switches. EX4300-24T-S, EX4300-24P-S, EX4300-32F-S, EX4300-48T-S,
and EX4300-48P-S switches are not shipped with power supplies; you must order the power supplies
separately.
This topic describes the DC power supplies.
CAUTION:
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.

Characteristics of a DC Power Supply

EX4300 switches support 550 W DC power supply (see
Figure 60: DC Power Supply for an EX4300 Switch
You can install up to two DC power supplies in an EX4300 switch. Power supplies are installed in the
power supply slots labeled PSU 0 and PSU 1 in the rear panel of the chassis.
Do not mix:
Figure 60 on page 185).
185