Calculating System Thermal Output For Your Ex8208 Switch Configuration; Calculating The Number Of Power Supplies Required For Your Ex8208 Switch Configuration - Juniper EX8208 Hardware Manual

= (5200 W) / (0.90)
= 5778 W

Calculating System Thermal Output for Your EX8208 Switch Configuration

Use the following procedure to calculate the system thermal output in British thermal units (BTU) per hour
for your switch configuration.
To calculate the system thermal output:
1. Determine the maximum system power consumption of your switch in watts. See
Power Consumption of Your EX8208 Switch Configuration" on page 122
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: 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.

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 dual power feed redundancy with AC power supplies,
which requires an N+N configuration.
"Calculating the
for how to do so.
124