Dell PowerConnect J-8208 Hardware Guide - Page 52

N+N Redundancy Configuration of AC Power Supplies

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Dell PowerConnect J-Series J-EX8208 Ethernet Switch Hardware Guide Table 20: N+1 Power Redundancy Configurations for Different J-EX8208 Switch Configurations Using 2000 W AC Power Supplies Switch Configuration Input Voltage Power Supplies Needed (N) Power Supplies Needed for N+1 No line cards High line (200-240 VAC) 1 2 installed Low line (100-120 VAC) 2 3 Fully loaded with High line (200-240 VAC) 3 4 8-port SFP+ line cards Low line (100-120 VAC) 5 6 N+N Redundancy Configuration of AC Power Supplies 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 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 redundancy configuration. Table 21 on page 36 lists the N+N power requirements of J-EX8208 switch configurations that use 2000 W AC power supplies. Table 21: N+N Power Supply Requirements for J-EX8208 Switch Configurations Using 2000 W AC Power Supplies Switch Configuration Input Voltage Power Supplies Needed (N) Power Supplies Needed for N+N No line cards High line (200-240 VAC) 1 2 installed Low line (100-120 VAC) 1 2 Fully loaded with High line (200-240 VAC) 3 8-port SFP+ line cards Low line (100-120 VAC) 4 6 Not Supported Related • AC Power Specifications for J-EX8200 Switches on page 75 Documentation • AC Power Supply LEDs in a J-EX8200 Switch on page 37 36

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Table 20: N+1 Power Redundancy Configurations for Different J-EX8208
Switch Configurations Using 2000 W AC Power Supplies
Power Supplies
Needed for N+1
Power Supplies
Needed (N)
Input Voltage
Switch
Configuration
2
1
High line (200–240 VAC)
No line cards
installed
3
2
Low line (100–120 VAC)
4
3
High line (200–240 VAC)
Fully loaded with
8-port SFP+ line
cards
6
5
Low line (100–120 VAC)
N+N Redundancy Configuration of AC Power Supplies
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 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 redundancy configuration.
Table 21 on page 36 lists the N+N power requirements of J-EX8208 switch configurations
that use 2000 W AC power supplies.
Table 21: N+N Power Supply Requirements for J-EX8208 Switch
Configurations Using 2000 W AC Power Supplies
Power Supplies
Needed for N+N
Power Supplies
Needed (N)
Input Voltage
Switch
Configuration
2
1
High line (200–240 VAC)
No line cards
installed
2
1
Low line (100–120 VAC)
6
3
High line (200–240 VAC)
Fully loaded with
8-port SFP+ line
cards
Not Supported
4
Low line (100–120 VAC)
Related
Documentation
AC Power Specifications for J-EX8200 Switches on page 75
•
•
AC Power Supply LEDs in a J-EX8200 Switch on page 37
36
Dell PowerConnect J-Series J-EX8208 Ethernet Switch Hardware Guide