Calculating The Power Consumption Of Your Ex8208 Switch Configuration; Calculating System Thermal Output For Your Ex8208 Switch; Configuration; Table 49: Chassis Power Consumption For N+1 Configurations And For N+N Configurations Running Junos Os Release 10.1 Or Earlier - Juniper EX8208 Complete Hardware Manual

Calculating the Power Consumption of Your EX8208 Switch Configuration

Copyright © 2010, Juniper Networks, Inc.
Ensure that you know the power requirements of different switch components. See
"Power Requirements for EX8208 Switch Components" on page 105.
This topic describes these tasks:
Calculating the Power Consumption of Your EX8208 Switch Configuration on page 109
Calculating System Thermal Output for Your EX8208 Switch Configuration on page 110
Calculating the Number of Power Supplies Required for Your EX8208 Switch
Configuration on page 111
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:
Determine the maximum power consumption of the base chassis components (that
1.
is, the components other than the line cards):
Use Table 49 on page 109 if your switch is configured for N+1 power redundancy or
if your switch is configured for N+N power redundancy and is running Junos OS
Release 10.1 or earlier.
Use Table 50 on page 110 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, the maximum fan speed is lowered,
reducing the chassis' maximum power consumption.
Table 49: 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
Chapter 7: Planning Power Requirements
Base Configuration Redundant Configuration
1100 W 1100 W
200 W 200 W
— 200 W
100 W 100 W
1400 W 1600 W
109