N+1 Redundancy Configuration Of Ac Power Supplies - Dell PowerConnect J-EX8216 Hardware Manual

Dell PowerConnect J-Series J-EX8216 Ethernet Switch Hardware Guide

N+1 Redundancy Configuration of AC Power Supplies

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Each AC power supply comes with a power retainer that holds the power cord in place.
See Figure 25 on page 40. The power retainer has a clip and an adjustment nut. The
L-shaped ends of the clip hook into the bracket holes on each side of the AC appliance
inlet on the faceplate. The adjustment nut holds the power cord in the correct position.
For instructions for installing the power retainer, see "Connecting AC Power to a J-EX8200
Switch" on page 131.
Figure 25: Power Retainer for an AC Power Supply
Each power supply connects to the midplane in a J-EX8216 switch. The backplane and
the midplane distribute the output power produced by the power supplies to different
switch components. Each AC power supply provides power to all the components in the
switch.
Each power supply has its own fan and is cooled by its own internal cooling system. The
airflow is from the front of the power supply to the back. Hot air exhausts from the rear
of the chassis.
A J-EX8216 switch supports both 2000 W AC power supplies and 3000 W AC power
supplies.
The 2000 W AC power supply supports both the low-line (100–120 VAC) and the high-line
(200–240 VAC) AC power configurations. In both cases, the output is 52 VDC. The output
power is 1200 W for low-line input and 2000 W for high-line input.
The 3000 W AC power supply supports only the high-line (200–240 VAC) AC power
configuration. Low-line input is not supported for the 3000 W AC power supplies on the
J-EX8216 switch. The output is 52 VDC. The output power is 3000 W for high-line input.
N+1 redundancy configuration is required for normal operation of J-EX8200 switches. In
an N+1 redundancy configuration, if one power supply fails or is removed, the remaining
power supplies continue to supply power for the switch without interruption.
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 a switch. You must then install an additional power supply to meet the required N+1
redundancy configuration. For details about different switch configurations, see "J-EX8216
Switch Configurations" on page 7.