Ac-Input And Dc-Input Power Supplies - Cisco Gigabit Switch Router 12008 Installation And Configuration Manual

Overview of the Cisco 12008

AC-Input and DC-Input Power Supplies

The Cisco 12008 router can be configured to operate with AC source power or DC source
power. You can install one or two AC-input power supplies or one or two DC-input power
supplies in the power supply bays located in the right side of the router enclosure (see
Figure 1-2).
A single power supply of either type is the standard router configuration. In such a
configuration, it is recommended that you install the power supply in the lower bay.
You can install a second (optional and redundant) power supply of the same type for backup
purposes.
Caution
proper flow of cooling air through the power supply bays and to satisfy EMI compliance
requirements.
Note
supply. Installed power supplies must always be of the same type. Furthermore, you should
not install two power supplies of either type unless you intend to actively use both units. In
other words, you should not power the router with a single power supply while using the
other bay to temporarily or indefinitely "store" an inert unit. Doing so will disrupt the
normal flow of cooling air through the router enclosure.
Figure 1-4 shows an AC-input power supply; Figure 1-5 shows a DC-input power supply.
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Cisco 12008 Gigabit Switch Router Installation and Configuration Guide
A vacant power supply bay must be covered with a blank filler panel to ensure
You cannot use an AC-input power supply in conjunction with a DC-input power