N+N Redundancy Configuration Of Ac Power Supplies - Dell PowerConnect J-EX8216 Hardware Manual

N+N Redundancy Configuration of AC Power Supplies

The following tables list the N+1 power requirements for different AC power supplies:
Table 21 on page 41—Lists the N+1 power requirements of J-EX8216 switch
configurations that use 2000 W AC power supplies.
Table 22 on page 41—Lists the N+1 power requirements of J-EX8216 switch
configurations that use 3000 W AC power supplies.
Table 21: N+1 Power Redundancy Configurations for J-EX8216 Switch
Configurations Using 2000 W AC Power Supplies
Switch
Configuration Input Voltage
No line cards High line (200–240 VAC)
installed
Low line (100–120 VAC)
Fully loaded with High line (200–240 VAC)
8-port SFP+ line
cards
Low line (100–120 VAC)
Table 22: N+1 Power Redundancy Configurations for J-EX8216 Switch
Configurations Using 3000 W AC Power Supplies
Switch
Configuration Input Voltage
No line cards High line (200–240 VAC)
installed
Fully loaded with High line (200–240 VAC)
8-port SFP+ line
cards
You can optionally configure your switch for N+N redundancy, in which N power supplies
can be removed or fail and the remaining N power supplies continue to supply power for
the switch without interruption. A common application for N+N redundancy is to have a
dual power feed for AC power supplies.
When you configure power management for N+N redundancy, power management
lowers the chassis maximum power consumption by lowering the maximum fan speed.
It does so to compensate for the fact that because more power is held in reserve in an
N+N configuration than in an N+1 configuration, less power would ordinarily be available
to power line cards. By reducing the chassis maximum power consumption, power
management allows the switch to power more line cards.
The AC power supplies (2000 W or 3000 W), the number and type of line cards installed
in the switch, and the input voltage determine the number of power supplies needed (N)
for the switch. You must then install additional power supplies to meet the N+N
Chapter 2: Component Descriptions
Power Supplies Power Supplies
Needed (N) Needed for N+1
2 3
2 3
5 6
Not supported Not supported
Power Supplies Power Supplies
Needed (N) Needed for N+1
1 2
4 5
41