S4048-ON Installation Guide January 2019

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Switch power-up

Supply power to the S4048–ON after it is mounted in a rack or cabinet.

Dell EMC recommends re-inspecting your switch before powering up. Verify the following:
  • The equipment is properly secured to the rack and properly grounded, optional.
  • The equipment rack is properly mounted and grounded, optional.
  • The ambient temperature around the unit—which may be higher than the room temperature, is within the limits specified for the S4048–ON. For more information, see Specifications.
  • There is sufficient airflow around the unit.
  • The input circuits are correctly sized for the loads and that you use sufficient over-current protection devices.
  • All protective covers are in place.
  • Blank panels are installed if you do not install optional modules.
  • NOTE: A US AC power cable is included for powering up an AC power supply. You must order all other power cables separately.
  • NOTE: ESD damage can occur if components are mishandled. Always wear an ESD-preventive wrist or heel ground strap when handling the S4048–ON switch and its components.

Power up sequence

When the switch powers up, the fans immediately come on at high speed. The fan speed slows as the switch continues to boot up.


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