Juniper Networks EX8208 manual Chassis Component Base Configuration RedundantConfiguration

Chapter 7: Planning Power Requirements

This topic describes these tasks:

•Calculating the Power Consumption of Your EX8208 Switch Configuration on page 115

•Calculating System Thermal Output for Your EX8208 Switch Configuration on page 116

•Calculating the Number of Power Supplies Required for Your EX8208 Switch Configuration on page 117

Calculating the Power Consumption of Your EX8208 Switch Configuration

Use the following procedure to determine the maximum power you need to supply to the switch. To calculate maximum system power consumption, you first determine the combined maximum internal power requirements of all the switch components and then divide this result by the power supply efficiency.

To calculate maximum system power consumption:

1.Determine the maximum power consumption of the base chassis components (that is, the components other than the line cards):

•Use Table 48 on page 115 if your switch is configured for N+1 power redundancy or if your switch is configured for N+N power redundancy and is running Junos OS Release 10.1 or earlier.

•Use Table 49 on page 116 only if your switch is running Junos OS Release 10.2 or later and power management is configured for N+N power redundancy.

NOTE: In Junos OS Release 10.2 or later, if power management is configured for N+N redundancy, the maximum fan speed is lowered, reducing the chassis’ maximum power consumption.

Table 48: Chassis Power Consumption for N+1 Configurations and for

N+N Configurations Running Junos OS Release 10.1 or Earlier

Chassis Component	Base Configuration	RedundantConfiguration
Fan tray	1100 W	1100 W
Switch Fabric and Routing Engine (SRE)	200 W	200 W
module
Second SRE module	—	200 W
Switch Fabric module	100 W	100 W
Total	1400 W	1600 W

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