WARNING: The switch is pluggable type A equipment installed in arestricted-access location. It has a separate protective earthing terminalprovided on the chassis in addition to the grounding pin of the power supplycord. This separate protective earth terminal must be permanently connectedto earth ground. See “Connecting Earth Ground to a J-EX Series Switch” onpage 129.RelatedDocumentationAC Power Supply in a J-EX8200 Switch on page 34•• AC Power Electrical Safety Guidelines for J-EX Series Switches on page 238• AC Power Disconnection Warning for J-EX Series Switches on page 239• General Electrical Safety Guidelines and Warnings for J-EX Series Switches on page 235• Connecting AC Power to a J-EX8200 Switch on page 130Calculating Power Requirements for a J-EX8208 SwitchUse the information in this topic to calculate power consumption, system thermal output,and number of power supplies required for different J-EX8208 switch configurations.Before you begin these calculations:• Ensure you understand the different switch configurations. See “J-EX8208 SwitchConfigurations” on page 6.• Ensure that you know the power requirements of different switch components. See“Power Requirements for J-EX8208 Switch Components” on page 76.This topic describes these tasks:• Calculating the Power Consumption of Your J-EX8208 Switch Configuration on page 79• Calculating System Thermal Output for Your J-EX8208 SwitchConfiguration on page 81• Calculating the Number of Power Supplies Required for Your J-EX8208 SwitchConfiguration on page 81Calculating the Power Consumption of Your J-EX8208 Switch ConfigurationUse the following procedure to determine the maximum power you need to supply tothe switch. To calculate maximum system power consumption, you first determine thecombined maximum internal power requirements of all the switch components and thendivide this result by the power supply efficiency.To calculate maximum system power consumption:1. Determine the maximum power consumption of the chassis components other thanthe line cards:79Chapter 7: Planning Power Requirements
