Cisco 3850 Power Consumption Calculator

This calculator helps you estimate the power consumption of a Cisco Catalyst 3850 switch based on its configuration and usage. Understanding power consumption is essential for capacity planning, cost estimation, and environmental impact assessment.

How to Use This Calculator

To calculate the power consumption of your Cisco 3850 switch:

Select the switch model from the dropdown menu.
Enter the number of active ports in use.
Select the power supply type (AC or DC).
Click "Calculate" to see the estimated power consumption.

The calculator provides an estimate based on standard specifications and typical usage patterns. For precise measurements, consult your switch's documentation or use a power meter.

Formula and Assumptions

The power consumption of a Cisco 3850 switch is calculated using the following formula:

Total Power Consumption (Watts) = Base Power + (Active Ports × Port Power)

Where:

Base Power - The power consumed by the switch when no ports are active (varies by model).
Active Ports - The number of Gigabit Ethernet ports currently in use.
Port Power - The power consumed per active port (typically 0.5W per port).

Note: These calculations are estimates based on typical usage. Actual power consumption may vary depending on specific configurations and environmental factors.

Example Calculation

Let's calculate the power consumption for a Cisco Catalyst 3850-24T switch with 12 active ports:

Total Power = 120W (Base Power) + (12 × 0.5W) = 120W + 6W = 126W

This means the switch will consume approximately 126 watts of power when 12 ports are active.

For a more detailed breakdown, refer to the table below:

Component	Power Consumption
Base Power	120W
Active Ports (12 × 0.5W)	6W
Total	126W

Frequently Asked Questions

What factors affect Cisco 3850 power consumption?: The power consumption is primarily affected by the number of active ports, switch model, and power supply type. Additional factors include temperature, fan speed, and optional modules.
How can I reduce power consumption on my Cisco 3850?: To reduce power consumption, disable unused ports, use energy-efficient power supplies, and implement power management features like EnergyWise. Also, consider using the switch in a controlled environment with proper ventilation.
Is the power consumption estimate accurate?: The calculator provides a reasonable estimate based on standard specifications. For precise measurements, use a power meter or consult the official Cisco documentation for your specific model.
Can I use this calculator for other Cisco switch models?: This calculator is specifically designed for the Cisco Catalyst 3850 series. For other models, use the appropriate calculator or consult Cisco's official documentation.