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. TheL-shaped ends of the clip hook into the bracket holes on each side of the AC applianceinlet 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-EX8200Switch” on page 131.Figure 25: Power Retainer for an AC Power SupplyEach power supply connects to the midplane in a J-EX8216 switch. The backplane andthe midplane distribute the output power produced by the power supplies to differentswitch components. Each AC power supply provides power to all the components in theswitch.Each power supply has its own fan and is cooled by its own internal cooling system. Theairflow is from the front of the power supply to the back. Hot air exhausts from the rearof the chassis.A J-EX8216 switch supports both 2000 W AC power supplies and 3000 W AC powersupplies.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 outputpower 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 powerconfiguration. Low-line input is not supported for the 3000 W AC power supplies on theJ-EX8216 switch. The output is 52 VDC. The output power is 3000 W for high-line input.N+1 Redundancy Configuration of AC Power SuppliesN+1 redundancy configuration is required for normal operation of J-EX8200 switches. Inan N+1 redundancy configuration, if one power supply fails or is removed, the remainingpower 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 installedin 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+1redundancy configuration. For details about different switch configurations, see “J-EX8216Switch Configurations” on page 7.40Dell PowerConnect J-Series J-EX8216 Ethernet Switch Hardware Guide
