Power Supply Modes - Cisco Catalyst 9600 Series Hardware Installation Manual

Product Overview
• Self-cooling, with a minimum airflow of 9.5 cubic feet per minute (CFM) at 100 percent load.
• Has a release latch mechanism on the side of the module, to avoid accidental removal of the module.
• Has DC-input reversal protection such that the unit will survive this condition up to the full input voltage
• Supports redundant and combined configuration modes. A single (non-redundant) or a dual (redundant)

Power Supply Modes

Cisco Catalyst 9600 Series Switches offer redundant and combined configuration modes for power supplies.
In both the modes, the power supplies will share the load equally.
The number of power supply modules installed and the system load determine the power-level that the system
expects to draw from each power supply module and consequently, the power supply mode that will be suitable.
For system power budgeting estimates and to determine power supply requirements, use the
Calculator.
To configure a power supply mode, enter the power redundancy-mode command in global configuration
mode. If you do not configure a mode, the default mode applies.
Combined Mode
This is the default power supply mode.
The system operates with one to four power supply modules. The power available to the system is the sum
of power outputs of all the power supply modules in the chassis multiplied by the share ratio. All available
power supply modules are active and sharing power, and can operate at up to 100 percent capacity. Additional
power supply units operate at 97 percent capacity. In combined mode, you can use a combination of AC and
DC power supplies provided the AC input voltage is 220V and that the power supplies are of equal wattage.
However, you cannot combine two AC power supplies of 110V input and 220V input.
Total combined mode power = P + (N-1) * P * (share ratio)
where P = Power output of one of the power supply units and N is the number of power supply modules used.
Warning
In case of failure in the combined mode, each operational power supply increases its output. If the output
power does not meet system requirements, then all the operational power supply modules may be overloaded
and go into overcurrent shutdown. All system power is then lost.
The following table provides details about the power output in combined mode:
rating.
power supply configuration, can support the following loads:
Input Voltage (VDC)
-40 to -72VDC (with extended range to -75VDC)
Voltage differential between inputs is unlimited.
Output Power
2000W
Cisco Catalyst 9600 Series Switches Hardware Installation Guide
Power Supply Modes
Cisco Power
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