Juniper Networks Cooling System and Airflow in an EX8208 Switch, Fan Tray for an EX8208 Switch

Chapter 2: Component Descriptions

Cooling System and Airflow in an EX8208 Switch

The cooling system in an EX8208 switch consists of a single fan tray. The fan tray is a hot-insertable and hot-removable field-replaceable unit (FRU). The fan tray contains 12 fans.

The fan tray installs vertically on the left side on the front of the chassis and provides side-to-side chassis cooling. A handle on the front faceplate facilitates handling of the fan tray. See Figure 30 on page 53.

Figure 30: Fan Tray for an EX8208 Switch

The fan tray can be removed and replaced from the front of the chassis. The switch continues to operate for a limited time (2 minutes) during the replacement of the fan tray without thermal shutdown.

CAUTION: You must replace the fan tray within 2 minutes of removing it.

The air intake to cool the chassis is located on the right side of the chassis. Air is pulled into the chassis and is pushed thorough the line card cage towards the fan tray. Hot air exhausts from the left side of the chassis. See Figure 31 on page 54.

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