Calculating The Power Consumption Of Your Ex8208 Switch Configuration - Juniper EX8208 Hardware Manual

This topic describes these tasks.

Calculating the Power Consumption of Your EX8208 Switch Configuration | 122

Calculating System Thermal Output for Your EX8208 Switch Configuration | 124
Calculating the Number of Power Supplies Required for Your EX8208 Switch Configuration | 124
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 58 on page 122
configured for N+N power redundancy and is running Junos OS Release 10.1 or earlier.
Use Table 59 on page 123
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 58: Chassis Power Consumption for N+1 Configurations and for N+N Configurations Running
Junos OS Release 10.1 or Earlier
Chassis Component
Fan tray
Switch Fabric and Routing Engine (SRE)
module
Second SRE module
Switch Fabric module
Total
if your switch is configured for N+1 power redundancy or if your switch is
only if your switch is running Junos OS Release 10.2 or later and power
Base Configuration
1100 W
200 W
—
100 W
1400 W
Redundant Configuration
1100 W
200 W
200 W
100 W
1600 W
122