Features
Enterasys S-Series S4 Chassis Hardware Installation Guide 1-5
Operating Status
The S-AC-PS and S-AC-PS-15A power supplies report information regarding their present
operating status. This information includes the following:
• Power supply ID (PS1, PS2, PS3, PS4)
• Power supply status (normal/fault/not installed)
• Power supply redundancy indication (redundant/not available)
Refer to the Enterasys S-Series CLI Reference Guide for instructions on how to access power supply
status information using Local Management.
Auto-Ranging Input Voltage and Frequency
The S-AC-PS and S-AC-PS-15A power supplies automatically adjust to the input voltage and
frequency, which allows for an input voltage of 100 to 220 Vac, and a frequency between 50 and
60 Hz. See the operating specifications in Appendix A. No additional adjustments are necessary.
See “Installing the AC Power Supplies” on page 3-14 for more details.
Hot Swapping
To reduce network downtime, a power supply may be hot swapped. When multiple power
supplies are installed, this allows the removal of one power supply without powering down the
chassis and interrupting network traffic.
DC Power Supplies
You can use the S-DC-PS power supplies in the S4 chassis in place of the AC power supplies
(S-AC-PS and S-AC-PS-15A).
The DC power supply connects a -48/-60 VDC battery voltage to the backplane of the S4 chassis.
Each power supply provides a maximum of 1200 watts of power. The DC power supply also
provides a +5 VDC auxiliary output.
The S-DC-PS power supply provides the following features:
• Redundancy — A maximum of four supplies can be operated in parallel, sharing a common
power bus. Failure of any single supply will not affect operation of the power bus. In addition,
inadvertent hot-swapping of energized power supplies will not affect bus operation. This
applies to all outputs of the power supply.
• Reverse polarity protection and alarm — No damage will occur to the power supply if the
input voltage is inadvertently reversed. An audible alarm will sound upon reverse polarity.
• Visual indicators — The power supply has two LEDs on the front panel. The IN LED lights
green when the input voltage is above the minimum required to operate. The OUT LED lights
green if all power supply voltage outputs are in regulation.
Note: You cannot install a combination of AC and DC power supplies in the S4 chassis.
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