In the DC power configuration, the services gateway contains either two or four DC power supplies (see Figure 1), located at the lower 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. The DC power supplies in slots PEM0 and PEM2 provide power to the lower fan tray, card slots 6 through 11, and SCB slots 1 and 2. The DC power supplies in slots PEM1 and PEM3 provide power to the upper fan tray, card slots 0 through 5, and SCB slot 0.
Four power supplies provide full redundancy. If a DC power supply fails, its redundant power supply takes over without interruption.
Each DC power supply has a single DC input (–48 VDC and return) that requires a dedicated 80 A (–48 VDC) circuit breaker for the maximum hardware configuration. For information about site power preparations and connecting the services gateway to power and ground, see the SRX 5800 Services Gateway Hardware Guide.
For site power preparations, inluding DC power supply and power system electrical specifications, see the SRX 5800 Services Gateway Hardware Guide.
Figure 1: DC Power Supply