Cisco Catalyst 9400 Series Hardware Installation Manual page 31

Product Overview
For example, all the power supply modules have an AC-input voltage of 220 VAC, or an AC-input
voltage 110 VAC.
AC Input and DC Input with N+1 Redundant Mode or Combined Mode
If you plan to install a mix of AC-input and DC-input power supply modules, you must meet these conditions
in the context of the N+1 redundant mode or combined mode:
• All the installed power supply modules must be of the same capacity.
For example, a mix of C9400-PWR-3200AC and C9400-PWR-3200DC are installed.
• All the installed AC-input power supply modules must have an AC-input voltage of 220 VAC.
AC Input and DC Input with N+N Redundant Mode
If you plan to install a mix of AC-input and DC-input power supply modules, you must meet these conditions
in the context of the N+N redundant mode:
• All the power supply modules that are configured as active must be of the same type; all the modules
that are configured as standby must be of the same type. (The type refers to AC input and DC input).
For example, all the installed active power supply modules are C9400-PWR-2100AC, all the installed
standby power modules are C9400-PWR-3200DC.
• All the installed AC-input power supply modules in the chassis must be of the same capacity and have
the same input voltage level.
Continuing with the above example, all the active power supply modules are C9400-PWR-2100AC, and
have an input voltage of 115 VAC.
• All the installed DC-input power supply modules must be configured as standby.
Continuing with the above example, all the installed C9400-PWR-3200DC modules are configured as
standby.
• If power supply modules of different capacities are installed, the higher capacity modules must be
configured as standby.
Continuing with the above example, the 3200 W module is the higher capacity module and all installed
C9400-PWR-3200DC modules are configured as standby.
Note Regardless of the type of power supply module installed (whether only AC input, or only DC input, or a mix
of both types), in the context of the N+N redundant mode, ensure the following:
• When transitioning or switching over to the N+N mode (from any other mode), there must be no change
in the power consumption budget during the transition period.
• Total standby output power must be greater than or equal to the total active output power (total standby
output power > or = total active output power). This ensures that the system continues to provide
redundancy at the time of a switchover.
Power Supply Module Installation Considerations
Cisco Catalyst 9400 Series Switches Hardware Installation Guide
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