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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.
Switch ground
Dell Technologies recommends you ground your switch. Use the S5448F-ON switch in a common bond network (CBN).
Connect the grounding cables as described in
NOTE:
For an AC-powered switch, although the third conductor of the AC power cable provides a ground path, Dell
Technologies recommends grounding your switch with a dedicated ground wire.
CAUTION:
For DC-powered switches, the only way to safely ground your switch is to attach a dedicated ground
wire. The ground lug ships inside the DC PSU shipping box. The two ground lug screws ship attached to the
switch. Before you power on the DC switch, ensure that the ground lug and ground wire are properly attached to
the switch and the earth ground.
Fans and airflow
The S5448F-ON switch fans support two airflow options: normal and reverse.
Fan combinations
Fan installation is done as part of the factory install based on stock keeping unit (SKU) type. The S5448F-ON switch has SKUs
that support the following configurations:
● AC PSU with fan airflow from the I/O to the PSU—normal—the red indicator is the normal airflow direction.
● DC PSU with fan airflow from the I/O to the PSU—normal—the red indicator is the normal airflow direction.
With the addition of the fan reversal kit, the S5448F-ON switch has SKUs that also support the following configurations:
● AC PSU with fan airflow from the PSU to the I/O—reverse—the blue indicator is the reverse airflow direction.
● DC PSU with fan airflow from the PSU to the I/O—reverse—the blue indicator is the reverse airflow direction.
Order the fans suitable to support your site ventilation. Use a single type of fan airflow in your switch.
CAUTION:
Switches with fan airflow from the PSU to the I/O—reverse airflow—are subject to tighter
restrictions for power consumption on cables and optics that are used for 400 GbE ports. Reverse airflow
switches do not support high-power cables or optics. 400 GbE transceivers and active cables may exceed
the supported threshold. For more information, see the
PowerSwitch S5448F-ON.
CAUTION:
To avoid damage to the switch, fan and PSU airflow directions must match. Do not mix normal airflow
and reverse airflow in a single switch.
For proper ventilation, position the switch in an equipment rack or cabinet with a minimum of 12.7 cm (5 inches) of clearance
around the exhaust vents. The fan speed varies based on internal temperature monitoring. The switch never intentionally turns
off the fans.
For more information, see Fans.
14
Site preparations
S5448F-ON switch
installation.
High-Power Optics for SmartFabric OS10 Dell EMC
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