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    Cooling System and Airflow in a Junos Pulse Gateway MAG6610 and MAG6611

    The cooling system in a Junos Pulse Gateway MAG6610 and MAG6611 consists of one or more fan trays. Each fan tray contains two fans. The fan tray is a hot-insertable and hot-removable field-replaceable unit (FRU).

    You remove and replace the fan tray from the rear of the chassis.

    The Junos Pulse Gateway continues to operate for a limited time (15 seconds) during the replacement of the fan tray without thermal shutdown. The fan tray provides front-to-back. The air intake to cool the chassis is located on the front of the chassis. Air is pulled into the chassis and pushed toward the fan tray. Hot air exhausts from the rear of the chassis.

    Temperature sensors in the chassis monitor the temperature within the chassis. The fan tray used in the Junos Pulse Gateway comes with load-sharing redundancy that can tolerate a single fan failure at room temperature (below 113° F/45° C) to still provide sufficient cooling.

    Under normal operating conditions, the fans in the fan tray run at less than full speed. If a fan fails or the ambient temperature rises above the threshold 113°F (45°C), the speed of the remaining fans is automatically adjusted to keep the temperature within the acceptable range, 32°F (0°C) through 113°F (45°C).

    The system raises an alarm if the fan fails or if the ambient temperature inside the chassis rises above the acceptable range. If the temperature inside the chassis rises above the threshold temperature, the system shuts down automatically.

    You cannot replace a single fan. If one or more fans fail, you must replace the entire fan tray.

    Note: Face plates are required for proper airflow and cooling. If you remove a service module and do not intend to replace it, cover the opening with the supplied face plate.

    Published: 2011-07-25