Power supplies
The S5148F-ON switch ships with two AC or DC power supplies. The two power supplies have two air-flow directions—from
the I/O to the PSU and from the PSU to the I/O.
Two PSUs are required for full redundancy, but the switch can operate with a single PSU.
The PSUs are field replaceable. When running with full redundancy—two power supplies installed and running—you can remove
and replace one PSU without disrupting traffic.
CAUTION: To prevent electrical shock, ensure that the S5148F-ON switch 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.
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: If you use a single PSU, install a blank plate in the other PSU slot. Use power supply 2 (PSU2) as the blank plate
slot. To install the blank plate, use a #1 Philips screw driver.
NOTE: ESD damage can occur if components are mishandled. Always wear an ESD-preventive wrist or heel ground strap
when handling the S5148F-ON switch and components.
Topics:
• Components
• AC or DC power supply installation
• DC power supply to power source connection
Components
The following power supply options are available for the S5148F-ON switch:
● AC or DC power supply with integrated fan
● AC or DC power supply with integrated reverse flow fan
Power supply 1 (PSU1) is on the left side of the switch; power supply 2 (PSU2) is on the right side of the switch.
Figure 15. S5148F-ON PSUs
● 1—PSU modules
The PSUs have an integrated fan, which you cannot replace individually; if the fan integrated in a PSU fails, you must replace
the entire PSU. You can replace the fan trays individually. For fan tray replacement procedures, see Fans.
WARNING:
Prevent exposure and contact with hazardous voltages. Do not attempt to operate this switch with
the safety cover removed.
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28 Power supplies
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