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To calculate the system thermal output:
1. Determine the maximum system power consumption of your switch in watts. See
“Calculating the Power Consumption of YourEX8208 Switch Configuration” on
page 115 for how to do so.
2. Multiply the maximum system power consumption by 3.41.
For example, for a switch fully loaded with 8-port SFP+ line cards and using N+1
power redundancy with high-voltage line input, the system thermal output:
= (maximum system power consumption) x (3.41)
= (5778 W) x (3.41) =
= 19,703 BTU/hr
NOTE: Usingthemaximumsystem powerconsumptionvaluestocalculatethesystem
thermal output often results in overprovisioning the cooling systems. Typical power
consumption is about one-third lower than these calculated values.
Calculating the Number of Power Supplies Required for Your EX8208 Switch Configuration
Use this procedure to calculate the number of power supplies required by your switch
configuration. The required power configuration for EX8208 switches is N+1. You can
optionally configure your switch for N+N configuration. For example, you might want
dualpowerfeedredundancywithACpowersupplies,whichrequiresanN+Nconfiguration.
117Copyright©2010,Juniper Networks,Inc.
Chapter7:PlanningPowerRequirements