N is the number of active power supply modules and can be one to seven power supply modules on a seven-slot
or a ten-slot chassis, and one to three power supply modules on a four-slot chassis. +1 is the power supply
module reserved for redundancy, and must be configured as the standby module (use the power
redundancy-mode command in global configuration mode).
The default standby power supply slot on a seven-slot or a ten-slot chassis is eight. The default standby power
supply slot on a four-slot chassis is four. To designate a different slot as standby, use the power
redundancy-mode command in global configuration mode.
N+N Redundant Mode
N number of power supply modules are configured as active, and n number of power supply modules are
configured as standby. To configure standby power supply modules, use the power redundancy-mode
command in global configuration mode.
For detailed software configuration information including examples, see the required version of the software
configuration guide. In the guide, go to Contents → System Management → Environmental Monitoring and
Power Management.
Power Supply Module Installation Considerations
This unit might have more than one power supply connection. All connections must be removed to de-energize
the unit. Statement 1028
Warning
Only trained and qualified personnel should be allowed to install, replace, or service this equipment. Statement
1030
Warning
No user-serviceable parts inside. Do not open. Statement 1073
Warning
While the installation of power supplies of different capacities in the same chassis is supported, it is not an
optimal use of total system power in a redundant mode.
Note
When installing power supply modules, ensure that the following conditions are met:
AC input Only
If you plan to install only AC-input power supply modules, you must meet these conditions in the context of
the N+1 redundant mode, or N+N redundant mode, or combined mode:
• All the installed power supply modules must be of the same capacity.
For example, all the installed modules are C9400-PWR-2100AC.
• All the installed power supply modules must have the same AC-input voltage level.
Cisco Catalyst 9400 Series Switches Hardware Installation Guide
24
Product Overview
Power Supply Module Installation Considerations
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