Juniper EX6210 Complete Hardware Manual page 141

Table 54: Calculating System Thermal Output for Your EX6210 Switch Configuration (continued)
Step
5 Determine the efficiency of the installed
power supply:
2500 W AC power supply efficiency is
approximately 94% at high-voltage line
(200–240 VAC) input.
2500 W AC power supply efficiency is
approximately 92% at low-voltage line
(100–120 VAC) input.
5000 W AC power supply efficiency is
approximately 92% at high-voltage line
(200–240 VAC) input.
5000 W AC power supply efficiency is
approximately 89% at low-voltage line
(100–120 VAC) input.
2100 W DC power supply efficiency is
approximately 92%.
6 Maximum System Power Requirement =
(Maximum Internal Power Requirement of
the Switch) / (Efficiency of the Installed
Power Supply)
7 System Thermal Output = (Maximum
System Power Requirement ) * 3.41
NOTE: 1 W = 3.41 BTU/hr
Related
Documentation
Copyright © 2014, Juniper Networks, Inc.
EX6210 switch
with two 48-port
RJ-45 line cards,
2100 W DC power
supply
92%
= 800 W / .92
= 870 W
= 870 * 3.41 BTU/hr
= 2996.7 BTU
NOTE: The system thermal output for your switch configuration will be
different from the values calculated in
maximum system power requirement values to calculate the system thermal
output would typically provide you with a value that would overprovision the
cooling system budget. The typical power requirement is about one-third
less than these calculated values.
AC Power Supplies in an EX6200 Switch on page 38
DC Power Supply in an EX6200 Switch on page 49
Understanding Power Management on EX Series Switches
Chapter 7: Planning Power Requirements
EX6210 switch EX6210 switch
with two 48-port with two 48-port
PoE+ line cards, SFP line cards,
2500 W AC power 5000 W AC power
supply supply
(high-voltage line (high-voltage line
input) input)
94% 92%
= 940 W / .94 = 1000 W / .92
= 1000 W = 1087 W
= 1000 * 3.41 = 1087 * 3.41 BTU/hr
BTU/hr
3706.67 BTU
= 3410 BTU
Table 54 on page 120. Using the
121