Calculating The Number Of Power Supplies Required For Your Ex8208 Switch Configuration - Juniper EX8208 Complete Hardware Manual

Calculating the Number of Power Supplies Required for Your EX8208 Switch Configuration

Copyright © 2010, Juniper Networks, Inc.
To calculate the system thermal output:
Determine the maximum system power consumption of your switch in watts. See
1.
"Calculating the Power Consumption of Your EX8208 Switch Configuration" on page 109
for how to do so.
Multiply the maximum system power consumption by 3.41.
2.
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: Using the maximum system power consumption values to calculate
the system thermal output often results in overprovisioning the cooling
systems. Typical power consumption is about one-third lower than these
calculated values.
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
dual power feed redundancy with AC power supplies, which requires an N+N configuration.
Chapter 7: Planning Power Requirements
111