Juniper PWR-MX480-1800-DC-S

In the DC power configuration, the MX480 router contains either two or four DC power supplies (see Figure 1) located at the rear of the chassis in slots PEM0 through PEM3 (left to right). You can upgrade your DC power system from two to four power supplies.

Four power supplies provide full redundancy. If a DC power supply in a redundant configuration is removed or fails, its redundant power supply takes over without interruption.