Cisco ASA 5512-X Hardware Installation Manual page 19

About the ASA 5500-X

AC and DC Support, page 19
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Power Supply Indicators and Connections, page 20
Dual Power Supply Support for the ASA 5545-X and ASA 5555-X
You can add an additional power supply, or you can order the ASA 5545-X or ASA 5555-X with two power supplies
installed. Having two power supplies installed provides a redundant power option. This configuration ensures that
if one power supply fails, the other power supply assumes the full load until the failed power supply is replaced.
To maintain air flow, an empty bay must be covered, or both bays must be populated with power supplies.
If only one power supply is installed, make sure that it is installed in slot 0 (left slot) and that slot 1 (right slot) is
covered with a slot cover. If only one power supply is installed, do not remove the power supply unless the chassis
has been powered off. Removing the only operational power supply causes an immediate power loss.
Power On Guidelines
The power supply is switched from Standby to ON by way of a system chassis STANDBY/ON switch. Earlier ASAs
(V01) require you to turn on the power with the power switch. Newer ASAs (V02) automatically turn on when you
plug in the power cable. To determine your version, do one of the following:

At the CLI prompt, enter the show inventory command and look for V01 or V02 in the output.

On the back of the chassis, look at the VID PID label for V01 or V02.
For the V01 chassis, see the following limitations:

The ASA requires 50 seconds from the time that AC power is applied before the power state can be updated
and stored. This means that any changes to the power state within the first 50 seconds of applying AC power
will not be observed if AC power is removed within that time.

The ASA requires 10 seconds from the time it is placed into standby mode before the power state can be
updated and stored. This means any changes to the power state within the first 10 seconds of entering
standby mode (including the standby mode itself) will not be observed if AC power is removed within that time.
For the V02 chassis, the above limitations to not apply.
The power supply slot numbers are on the back of the chassis to the left side of each power supply. When facing
the back of the chassis, power supply slot 0 (PS0) is to the left and power supply slot 1(PS1) is to the right. By
default, a single power supply is installed in slot 0.
AC and DC Support
The ASA supports the following power supplies:

AC power supply—Provides 400 watt output power with two DC voltage outputs: +12 V and +5 V. The AC
power supply operates between 85 and 264 VAC. The AC power supply current shares on the 12 V output
and is used in a dual hot-pluggable configuration. The AC power supply consumes a maximum of 471 W of
input power.
When the Cisco ASA 5500-X operates on AC power, it supports the ability to restore the previous power state
of the system in the event that AC power is lost.

DC power supply—Provides 400 watt output power with two DC voltage outputs: +12 V and +5.0 V. The power
supply operates between –40.5 and –72 VDC. The DC power supply current shares on the 12 V output and is
used in a dual hot-pluggable configuration. The DC power supply consumes a maximum of 500 W of input
power.
Note: The ASA 5545-X and ASA 5555-X can support two AC or two DC power supplies. Do not mix AC and DC
power supply units in the same chassis.
Cisco ASA 5512-X, ASA 5515-X, ASA 5525-X, ASA 5545-X, and ASA 5555-X Hardware Installation Guide
Power Supply
19