S4048-ON Installation Guide January 2019

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Fans and airflow

The S4048–ON fans support two airflow options.

Fan combinations

The S4048-ON has stock keeping units (SKUs) that support the following configurations. Installation of the fans is done as part of the factory install based on SKU type.

  • AC PSU with fan airflow from the I/O-side to the PSU-side
  • AC PSU with fan airflow from the PSU-side to the I/O-side

Be sure to order the fans suitable to support your site’s ventilation. Use a single type of airflow fan in your switch. Do not mix reverse and normal air flows in a single S4048–ON chassis.

For proper ventilation, position the S4048-ON in an equipment rack (or cabinet) with a minimum of 5 inches (12.7 cm) of clearance around the exhaust vents. When you install two S4048-ON switches near each other, position the two chassis at least 5 inches (12.7 cm) apart to permit proper airflow. The fan speed increases when the internal temperature reaches 161.6°F (72°C) and decreases to normal speed when the temperature falls to 136.4°F (58°C). The S4048-ON never intentionally turns off the fans.


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