# Power Redundancy Function

## 1. Function Overview

The SWX3220-30MC/TCs can accommodate two power supply units.
The switch can continue operating even if one power supply unit fails or a power cable is accidentally disconnected.
It also supports the hot-swap function, allowing you to replace or add power supply units while the switch is running.
For instructions on how to insert and remove the power supply unit, refer to the user guide.

As shown in the diagram above, the slot numbers are 1 on the right and 2 on the left, facing the rear.
The LED lighting pattern of the power supply unit is as follows:

Item | Description
--- | ---
Green light | The power supply unit is operating normally
Unlit | No power is being supplied to any power supply unit
Green flash | The power supply unit is not recognized correctly
Orange light | An error has occurred in the power supply unit, and power supply has stopped The power cable is not inserted
Orange flash | A power supply unit warning has occurred

## 2. Definition of Terms Used

- Power Supply Unit Warning

  - A minor problem has occurred with the power supply unit. Power supply continues.

- Power supply unit abnormality

  - A serious problem has occurred with the power supply unit. Stop the power supply.

## 3. Function Details

### 3.1. Power Supply Unit Status Check

You can check the status of the power supply unit by executing the show power-supply command.
The following items can be checked:

Item | Description
--- | ---
Slot | Power supply unit slot IDs (stack ID + slot ID)
Model | Power supply unit model name
Serial | Power supply unit serial number
Status | Power supply unit status
Voltage | Input voltage
Wattage | Input power consumption
Max | Maximum power consumption
FanSpeed | Power supply unit fan speed

The items displayed in Status are as follows:
If multiple Failed or Warning items occur simultaneously, the causes are listed.

Item | Description
--- | ---
None | Power supply unit not plugged in
Powered | Power is being supplied normally
No AC-cable | Power cable not plugged in
Wrong module | An unsupported power supply unit is plugged in
Warned(In) | A warning has occurred on the input side regarding current, voltage, or power consumption
Warned(Out) | A warning has occurred on the output side regarding current, voltage, or power consumption
Warned(Temp) | A warning has occurred regarding the power supply unit temperature.
Warned(FAN) | A warning is occurring for the power supply unit fan
Failed(In) | An abnormality has occurred on the input side regarding current, voltage, or power consumption
Failed(Out) | An abnormality has occurred on the output side regarding current, voltage, or power consumption
Failed(Temp) | An abnormality has occurred in the power supply unit temperature
Failed(FAN) | An abnormality has occurred in the power supply unit fan

If a power supply unit warning occurs, review the installation environment.
If a problem occurs with the power supply unit, review the installation environment or replace the power supply unit.
Refer to the user guide for details.

### 3.2. Changes in power supply unit status

If there is a change in the status of the power supply unit, you can check it on the dashboard as shown below.

The types of power supply unit status changes are as follows:

Item | Description
--- | ---
Power supply unit insertion | The power supply unit is inserted
Power supply unit removal | The power supply unit was removed
Power cable insertion | The power cable is inserted
Power cable removal | The power cable was removed
Input power warning | A warning has occurred regarding the input current or voltage
Output power warning | A warning has occurred regarding the output current or voltage
Temperature warning | The power supply temperature has exceeded the warning threshold
Fan warning | A warning has occurred regarding the power supply unit fan
Input power supply abnormality | An abnormality has occurred in the input current or voltage
Output power supply abnormality | An abnormality has occurred in the output current or voltage
Temperature anomaly | The temperature of the power supply unit has exceeded the abnormal threshold
Fan error | An abnormality has occurred in the power supply unit fan.

## 4. Related Commands

Related commands are indicated below.
For command details, refer to the command reference.

Operations | Operating commands
--- | ---
Display power supply unit status | show power-supply

## 5. Examples of Command Execution

### 5.1. Power Supply Unit Status Check

Display the status of the power supply unit.

- In a non-stack configuration

      Yamaha# show power-supply
      Slot Model        Serial     Status                   Volt Watt  Max FanSpeed
      -------------------------------------------------------------------------------
       1.1 YPSU-550W-AC Z8X00000DZ Powered                  104V  61W 750W  3864rpm
       1.2 YPSU-550W-AC Z8X00001DZ Failed(In)                 0V   0W 750W  2164rpm

- In a stack configuration

      Yamaha# show power-supply
      Slot Model        Serial     Status                   Volt Watt  Max FanSpeed
      -------------------------------------------------------------------------------
       1.1 YPSU-550W-AC Z8X00000DZ No AC-cable                0V   0W 750W     0rpm
       1.2 YPSU-550W-AC Z8X00001DZ Powered                  105V  61W 750W  4320rpm
       2.1 YPSU-550W-AC Z8X00002DZ Powered                  105V  35W 750W  4136rpm
       2.2 YPSU-550W-AC Z8X00003DZ Powered                  105V  29W 750W  4208rpm

## 6. Points of Caution

- This function cannot be used with power units other than genuine Yamaha power units.

## 7. Related Documentation

- L2MS

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