Install Guide

Power supplies
The S4048T-ON ships with two power supply units.
The system supports AC or DC power supplies with two air-flow directions—from the I/O side to the PSU side and from the
PSU side to the I/O side. Two PSUs are required for full redundancy, but the system can operate with a single PSU.
The PSUs are field replaceable. When running with full redundancy—two power supply units installed and running, you can
remove and replace one PSU without disrupting traffic.
NOTE: If you use a single PSU, install a blank plate in the other PSU slot. Dell EMC recommends using PSU2 as the blank
plate slot.
NOTE: Connect the power supply to the appropriate branch circuit protection as defined by your local electrical codes.
Verify that the remote power source complies with the switch input power specifications.
NOTE: ESD damage can occur if components are mishandled. Always wear an ESD-preventive wrist or heel ground strap
when handling the S4048T-ON and its components.
CAUTION: To prevent electrical shock, verify that the S4048T-ON is grounded properly. If you do not ground
your equipment correctly, excessive emissions may result. Use a qualified electrician to ensure that the power
cables meet your local electrical requirements.
Topics:
• Components
• AC power supply installation
• DC power supply connection
Components
The following power supply options are available for the S4048T-ON:
● AC or DC power supply with integrated fan
● AC or DC power supply with integrated reverse flow fan
PSU1 is on the left side of the chassis; PSU2 is on the right side of the chassis.
Figure 16. S4048T-ON PSU-side view
1.
PSU1 2. Fan modules
3. RS-232/RJ-45 serial console port 4. PSU2
5. 10/100/1000BaseT Ethernet management port
The PSUs are single units that include an integrated fan. You can individually replace the separate fan units however if the
integrated PSU fan fails, you must replace the entire PSU. For fan tray replacement procedures, see Fans.
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26 Power supplies