Install Guide

Power supplies
The S5148F-ON switch ships with two AC or DC power supplies. The two power supplies have two air-ow 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 eld replaceable. When running with full redundancy—two power supplies installed and running—you can remove and
replace one PSU without disrupting trac.
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 qualied electrician to ensure that the power cables meet your local
electrical requirements.
NOTE: Connect the power supply to the appropriate branch circuit protection as dened by your local electrical codes. Verify
that the remote power source complies with the switch input power specications.
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 ow 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
6
Power supplies 31