Model: SSA-AC-PS-625W
AC Power Supplies
Two AC power supply models, ordered separately, are available for the SSA:
• SSA-AC-PS-625W
• SSA-AC-PS-1000W
The SSA AC power supplies automatically adjust to the input voltage and frequency,.
supply redundancy are supported:
• Redundant mode, in which the power made available to the system is equal to the maximum output
of the lowest rated supply. If you choose to use two power supplies in a redundant power
configuration, system power redundancy is guaranteed if one supply is lost. Power supplies are hot
swappable in this operational mode.
• Non-redundant, or additive, mode, in which the combined output of both supplies is made available
to the system. If you choose to use two power supplies in a non-redundant power configuration, the
loss of a single supply may result in a system reset. Power supplies are not hot swappable in this
operational mode.
The following power configurations are supported:
• Redundant
• 625 watts (2 x 625)
• 625 watts (625 + 1000)
• 1000 watts (2 x 1000)
• Non-redundant (additive)
• 625 watts (1 x 625)
• 1000 watts (1 x 1000)
• 1250 watts (2 x 625)
• 1625 watts (1000 + 625)
• 2000 watts (2 x 1000)

Fans
The SSA uses thirteen individual 12V fans to cool the system. Though the SSA fans are field replaceable,
they are not hot swappable. For information on how to replace SSA fans, see Replacing the SSA Fans on
page 43.
Micro-USB Port
The micro-USB port is intended for debug purposes only.
Power over Ethernet
Three SSA models—SSA-T4068-0252, SSA-T1068-0652, and SSA-T1068-0652A—support both IEEE
802.3AF and 802.3at Power over Ethernet (PoE) standards, with up to 1500 watts available for PoE.
Depending on your power supply configuration, the SSA-T4068-0252, SSA-T1068-0652, and SSAT1068-0652A can supply PoE power to powered devices on all 48 RJ45 ports simultaneously.
The red PoE button switches the RJ45 port LEDs to report PoE information. In PoE mode, the PWR LED
changes to indicate the power supplies installed in the SSA. For more information, see Table 10 on page
38.
For an overview of PoE, see Power over Ethernet (PoE) for S-Series Devices on page 63.

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