site circuit breaker. For normal capacity power supplies, we recommend a dedicated
circuit breaker rated for 40 A (–48 VDC) minimum, or as required by local code.
For high capacity power supplies, we recommend that you provision 60 A or 70 A per
feed, depending on the selected DIP switch setting.
Figure 34 on page 93 shows the normal capacity DC power supply.
Figure 35 on page 93 shows the high-capacity DC power supply.
Figure 34: DC Power Supply
Figure 35: High-Capacity DC Power Supply
DC Power Supply Configurations
In the DC power configuration, the router contains either one or two DC power supplies
located at the rear of the chassis in slots PEM0 and PEM2 (left to right). You can upgrade
your DC power systemfrom one to two power supplies. A single DC power supply provides
power to all components. A second DC power supply provides redundancy. If a DC power
supply in a redundant configuration fails, the redundant power supply takes over without
interruption.
High-capacity DC power supplies have a DIP switch that selects the power output.
93Copyright © 2017, Juniper Networks, Inc.
Chapter 7: Power System Components and Descriptions
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