Juniper Networks MX480 - Manual (Page 69)

Figure 23: DC Power Supply
Figure 24: High-Capacity DC Power Supply
g004725
DC Power Supply Configurations
In the DC power configuration, the MX480 router contains either two or four DC power
supplies (see
Figure 23 on page 45 ) 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. The DC power supply in
PEM2 serves as redundant to the DC power supply
in slot PEM0 , and the DC power supply in PEM3 serves as redundant to the DC power
supply in slot PEM1 . If only two DC power supplies are installed, they must be installed
in slots PEM0 and PEM1 or in slots PEM2 and PEM3 .
Table 18 on page 45 shows the components that are powered by each DC power supply
slot. It applies to existing and high-capacity power supplies.
Table 18: Power Supply Redundancy and Power Distribution
Power Supply Provides Power to the Following Components DC Power Supply Slot
Fan tray, DPC slots 0 and 1 , and SCB slots 0 and 1 PEM0
45 Copyright © 2013, Juniper Networks, Inc.
Chapter 2: MX480 Hardware Components