Install Guide

● Rack mounting—You may either place the switch on a rack shelf or mount the switch directly into a 19" wide, EIA-310-E-
compliant rack.
● Rack loading—Overloading or uneven loading of racks may result in shelf or rack failure and may damage the equipment
or cause possible personal injury. Stabilize the racks in a permanent location before loading begins. Mount the components
starting at the bottom of the rack, then work to the top. Do not exceed your rack load rating.
● Power considerations—Connect only to the power source specified on the unit. When you install multiple electrical
components in a rack, ensure that the total component power ratings do not exceed the circuit capabilities. Overloaded
power sources and extension cords present fire and shock hazards.
● Elevated ambient temperature—If you install the equipment in a closed rack assembly, the operating temperature of the rack
environment may be greater than the room ambient temperature. The acceptable ambient temperature ranges are listed in
Specifications under Environmental Parameters.
●
Reduced air flow—Install the equipment in the rack so that you do not compromise the amount of airflow required for safe
operation of the switch. For proper ventilation, position the chassis in an equipment rack or cabinet with a minimum of 5
inches (12.7 cm) of clearance around exhaust vents.
● Reverse air flow—To ensure cool air intake and to avoid hot air blow out from the I/O side, ensure that you have the
necessary clearance.
● Reliable earthing—Maintain reliable earthing of rack-mounted equipment. Pay particular attention to the supply connections
other than the direct connections to the branch circuit; for example, use of power strips.
● Do not mount the equipment with the PSU side facing in a downward position.
NOTE: Always handle the system and its components with care. Avoid dropping the chassis or its field replaceable units.
CAUTION: Always wear an electrostatic discharge (ESD) wrist or heel ground strap when handling a system and
its components. As with all electrical devices of this type, take all necessary safety precautions to prevent injury
when installing this system. ESD damage can occur if components are mishandled.
Cabinet placement
Install the S4048T-ON only in indoor cabinets designed for use in a controlled environment.
Do not install the S4048T–ON in outside cabinets. For cabinet placement requirements, see Site selection.
The cabinet must meet minimum size requirements. Airflow must be in accordance with the Electronic Industries Alliance (EIA)
standard. Ensure that there is a minimum of 5 inches (12.7 cm) between the intake and exhaust vents and the cabinet wall.
Rack mounting
When you prepare your equipment rack, ensure that the rack is grounded.
Ground the equipment rack to the same ground point the power service in your area uses. The ground path must be permanent.
System ground
Dell EMC recommends you ground your system. Use the S4048T-ON in a common bond network (CBN).
Connect the grounding cable as described in Ground lug and bracket installation and Ground wire installation.
Fans and airflow
The S4048T-ON fans support two airflow options.
Fan combinations
Fans are installed as part of the factory install based on SKU type. The system has stock keeping units (SKUs) that support the
following configurations:
● AC or DC PSU with fan airflow from the I/O to the PSU
Site preparations
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