Calculating The System Thermal Output For Your J-Ex8216 Switch Configuration - Dell PowerConnect J-EX8216 Hardware Manual

Calculating the System Thermal Output for Your J-EX8216 Switch Configuration

Table 41: Chassis Power Consumption for N+N Configurations
Chassis Component
Two fan trays
RE module
Second RE module
Eight SF modules
Total
Calculate the maximum internal power consumption of the entire switch by adding
2.
in the power requirements of each line card.
For example, for a switch fully loaded with 8-port SFP+ line cards and using N+1 power
redundancy, the maximum internal power consumption:
= (chassis watts) + 16 (8-port SFP+ line card watts)
= (2400 W + 16 (450 W))
= (2400 W + 7200 W)
= 9600 W
Calculate the maximum system power consumption by dividing the maximum internal
3.
power consumption by the efficiency of the power supply. This accounts for the loss
of energy within the power supply.
NOTE: The efficiency of a 2000 W AC or 3000 W AC power supply is
approximately 90 percent when input voltage is high line (200–240 VAC).
The efficiency of a 2000 W AC power supply is approximately 87 percent
when input voltage is low line (100–120 VAC).
For example, for a switch fully loaded with 8-port SFP+ line cards and using N+1 power
redundancy with high-line input voltage, the maximum system power consumption:
= (maximum internal power consumption) / (power supply efficiency)
= (9600 W) / (0.90)
= 10,667 W
Use the following procedure to calculate the system thermal output in British thermal
units (BTU) per hour for your switch configuration.
Chapter 7: Planning Power Requirements
Redundant Configuration
1000 W
100 W
100 W
600 W
1800 W
87