Juniper QFX5120 Series - QFX5120 Cooling System; QFX5120 Models with Front-To-Back Airflow | 45

Table 11: Status LED on SFP28 and SFP+ Uplink Ports
State and DescriptionColorLED
Indicates the speed. The speed indicators are:
•
Blinking green—1 Gbps and 10 Gbps
•
Steadily green—25 Gbps
GreenStatus
QFX5120 Cooling System
IN THIS SECTION
QFX5120 Cooling System | 42
QFX5120 Models and Airflow Direction | 43
QFX5120 Models with Front-to-Back Airflow | 45
QFX5120 Models with Back-to-Front Airflow | 47
Positioning the Switch | 48
QFX5120 Fan Module Status | 49
The cooling system in a QFX5120 device consists of fan modules and the fans that are part of the power
supplies. The QFX5120-32C has six fan modules, and the QFX5120-48Y has five fan modules. You can
order a QFX5120 that works in one of two airflow directions. The airflow direction depends on the fan
modules and power supplies that are installed in the switch. QFX5120 switches provide back-to-front
airflow (air enters through the back of the switch), indicated by the label AIR IN, or front-to-back (air
exhausts through the back of the switch), indicated by the label AIR OUT—depending on the fan modules
and power supplies installed in the switch.
CAUTION: You must not mix fan modules and power supplies with different airflow
directions in the same chassis.
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