Characteristics Of A Dc Power Supply - Juniper QFX5120 Series Hardware Manual

The DC power supply in QFX5120 switches is a hot-insertable and hot-removable field-replaceable unit
(FRU): You can install it without powering off the switch or disrupting the switching function.
All the QFX5120 switches that are powered by DC power supplies are shipped with one DC power supply
pre-installed in the rear panel of the switches.
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.
This topic includes:

Characteristics of a DC Power Supply

QFX5120 switches support 650 W DC power supply (see
Figure 33: DC Power Supply for an QFX5120 Switch
You can install up to two DC power supplies in an QFX5120 switch. Power supplies are installed in the
power supply slots labeled PSU 0 and PSU 1 in the rear panel of the chassis.
Table 20 on page 59 lists the details of the 650 W DC power supplies used in QFX5120 switches.
Do not mix:
Figure 33 on page 58).
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