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Installation guide

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Cisco ASA 5500-X Series Hardware Installation Guide
OL-32129-01
Chapter 1 About the ASA 5500-X
Power Supply
Power Supply
The ASA 5512-X, ASA 5515-X, and ASA 5525-X ship with one fixed fan and one fixed power supply
(AC or DC) installed. The ASA 5545-X and ASA 5555-X ship with one power supply (AC or DC)
installed.
• Dual Power Supply Support for the ASA 5545-X and ASA 5555-X, page 1-14
• Power On Guidelines, page 1-14
• AC and DC Support, page 1-15
• Power Supply Indicators and Connections, page 1-15
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.