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Cooling System and Airflow in an EX4100-F Switch

The cooling system in EX4100-F switch consists of fanless models and models with built-in fan(s). EX4100-F-12P and EX4100-F-12T switch models are fanless and rely on natural convection cooling. The airflow direction depends on the fan modules and power supplies installed in the switch.

Airflow Direction in EX4100-F Switch Models

Table 1 shows the direction of airflow in EX4100-F models as shipped.

Table 1: Airflow Direction in EX4100-F Switch Models

Model Number

Fan Modules and Power Supply

Direction of Airflow

  • EX4100-F-24T

  • EX4100-F-48T

One built-in fan with AFO cooling.

Front-to-back—cold air to cool the chassis enters through the vents on the front panel of the chassis, and hot air exits through the vents on the rear panel of the chassis.

  • EX4100-F-24P

  • EX4100-F-48P

Two built-in fans with AFO cooling.

Front-to-back—cold air to cool the chassis enters through the vents on the front panel of the chassis, and hot air exits through the vents on the rear panel of the chassis.

EX4100-F Switches with Front-to-Back Airflow

In EX4100-F switch models with front-to-back airflow, air enters through vents on the front panel to cool the chassis. The hot air then exits through the vents on the rear panel.

Note:

The front side of a switch is the side where the ports are located. The rear side is where the fans are located.
Figure 1: Front-to-Back Airflow Through the EX4100-F-24P Switch Chassis Front-to-Back Airflow Through the EX4100-F-24P Switch Chassis
Figure 2: Front-to-Back Airflow Through the EX4100-F-24T Switch Chassis Front-to-Back Airflow Through the EX4100-F-24T Switch Chassis
Figure 3: Front-to-Back Airflow Through the EX4100-F-48P Switch Chassis Front-to-Back Airflow Through the EX4100-F-48P Switch Chassis
Figure 4: Front-to-Back Airflow Through the EX4100-F-48T Switch Chassis Front-to-Back Airflow Through the EX4100-F-48T Switch Chassis

How to Position the Switch

Position the switch with front-to-back airflow in such a manner that the AIR OUT labels on the fan modules and power supplies are next to the hot aisle (see Figure 5).

Figure 5: Deployment of Switches with Front-to-Back Airflow Through the Switch Chassis Deployment of Switches with Front-to-Back Airflow Through the Switch Chassis

Position the switch with back-to-front airflow in such a manner that the AIR IN labels on the fan modules and power supplies are next to the cold aisle (see Figure 6).

Figure 6: Deployment of Switches with Back-to-Front Airflow Through the Switch Chassis Deployment of Switches with Back-to-Front Airflow Through the Switch Chassis