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    Cooling System and Airflow in an EX3300 Switch

    The cooling system in an EX3300 switch consists of two fans: one along the rear of the chassis and another along the left side of the chassis. The fans provide front-to-back or back-to-front chassis cooling depending on the switch model. Table 1 shows the different EX3300 switch models and their direction of airflow.

    Table 1: Airflow Direction in EX3300 Switch Models

    Model

    Direction of Airflow

    EX3300-24T

    Front-to-back

    EX3300-24P

    Front-to-back

    EX3300-24T-DC

    Front-to-back

    EX3300-48T

    Front-to-back

    EX3300-48T-BF

    Back-to-front

    EX3300-48P

    Front-to-back

    In front-to-back airflow models, the air intake is located on the front of the chassis. Cool air is pulled into the chassis and pushed toward the rear of the chassis. Hot air exhausts from the rear of the chassis. See Figure 1.

    Figure 1: Front-to-Back Airflow Through the EX3300 Switch Chassis

    Front-to-Back Airflow Through
the EX3300 Switch Chassis

    In back-to-front airflow models, the air intake is located on the rear of the chassis. Cool air is pulled into the chassis and pushed toward the front of the chassis. Hot air exhausts from the front of the chassis. See Figure 2.

    Figure 2: Back-to-Front Airflow Through the EX3300 Switch Chassis

    Back-to-Front Airflow Through
the EX3300 Switch Chassis

    Under normal operating conditions, the fans operate at moderate speeds for minimal noise. Temperature sensors in the chassis monitor the temperature within the chassis. If any fan fails or if the temperature inside the chassis rises above the threshold, the switch raises an alarm and all functioning fans operate at a higher speed than normal. If the temperature inside the chassis rises above the threshold, the switch shuts down automatically.

    Published: 2013-02-27