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This topic describes these tasks:
•
Calculatingthe PowerConsumptionof YourEX8208SwitchConfigurationon page115
•
CalculatingSystemThermalOutputforYourEX8208SwitchConfigurationonpage116
•
Calculating the Number of Power Supplies Required for YourEX8208 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
combinedmaximuminternalpowerrequirementsofalltheswitchcomponentsandthen
divide this result by the power supply efficiency.
To calculate maximum system power consumption:
1. Determinethemaximumpowerconsumptionofthebasechassiscomponents(that
is, the components other than the line cards):
•
Use Table 48 on page 115 if your switchis configured forN+1 powerredundancy 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,themaximumfanspeedislowered,reducingthechassis’maximumpower
consumption.
Table 48: Chassis Power Consumption for N+1 Configurations and for
N+N Configurations Running Junos OS Release 10.1 or Earlier
RedundantConfigurationBaseConfigurationChassisComponent
1100 W1100 WFan tray
200 W200 WSwitchFabricandRoutingEngine(SRE)
module
200 W—SecondSRE module
100 W100 WSwitchFabricmodule
1600W1400WTotal
115Copyright©2010, JuniperNetworks, Inc.
Chapter7:PlanningPowerRequirements