Power Supplies
Choose a network switch power supply by switch model, wattage and airflow. On PoE switches the supply sets the PoE budget, and its airflow label has to match the fans: Juniper's EX4300 guide says not to mix AC and DC supplies, or supplies and fan modules with different AIR IN (AFI) and AIR OUT (AFO) labels, in the same chassis. Supplies are built per switch family, Juniper EX, Dell Networking, Cisco Catalyst and Nexus, Arista and HPE among them. Juniper's 920 W AC supply for the EX3400 is the JPSU-920-AC-AFO. Each supply is tested in-house before it goes out.
-
Cisco C3KX-PWR-1100WAC 3K-X 1100W AC Power SupplyAvailability: Available by QuoteManufacturer: Cisco Condition: Refurbished 1 Year WarrantyRequest PricingOut of stock - Summit Extreme Networks 10930 300W AC Power Supply ModuleAvailability: Available by QuoteManufacturer: Extreme Networks Condition: Refurbished 1 Year WarrantyRequest PricingOut of stock
- Cisco NXA-PAC-650W-PE Nexus 3K 9K 650W 80+ Port Side Exhaust AC Power SupplyAvailability: Available by QuoteManufacturer: Cisco Condition: Refurbished 1 Year WarrantyRequest PricingOut of stock
Juniper EX and Catalyst 3850 supplies: watts, airflow and PoE
On a Juniper EX switch the supplies installed set the PoE budget: Juniper rates the 48-port PoE EX3400 at 740 W of PoE on one 920 W supply and 1440 W on two, and a 48-port EX4300 at 925 W on one 1100 W supply. The rows below are from Juniper's EX3400 and EX4300 power-system guides and Cisco's Catalyst 3850 data sheet.
| Switch | Supply ratings the vendor offers | Airflow versions | PoE power the vendor publishes |
|---|---|---|---|
| EX3400 | 150 W AC or DC, 600 W AC, 920 W AC | AFO front-to-back and AFI back-to-front, by supply | 24-port PoE model: 370 W on one 600 W supply, 720 W on two; 48-port PoE model: 740 W on one 920 W supply, 1440 W on two |
| EX4300 | 350 W, 715 W and 1100 W AC; 550 W DC | AFO front-to-back and AFI back-to-front | 48-port model: 175 W on one 350 W, 540 W on one 715 W, 925 W on one 1100 W and 1440 W on two |
| Catalyst 3850 | 350 W AC, 1100 W AC, 440 W DC | - | - |
Supplies for other switch families follow the same rules: match the switch model, the wattage and the airflow label of the fans already installed. Fan modules in normal and reverse airflow are on Switch Fans, the switches on Juniper Networks and Cisco Switches, and other spares under Switching Accessories.
