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NOTE: The power backplane for a subsystem distributes regulated 52 VDC to all boards supplied

by that subsystem.

Each DC PDM has seven or nine DC inputs (–48 VDC) and return terminals for each input), (see

Figure 46 on page 108). You can select 60-A or 80-A input feed capacity on the DC PDM by setting the

DIP switch on the PDM to the rated amperage of the DC power input feeds.

NOTE: The selected input capacity applies to all inputs of this PDM. Selecting 60-A reduces the

available power output capacity of the PSMs supplied by this PDM.

Figure 46: MX2020 DC PDM

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NOTE: The type of feed that you use on the DC PDM (60-A or 80-A) depends on the distribution

scheme and distribution equipment. With a 60-A feed, the maximum power supply output power

is limited to 2100 W while the maximum power supply input power is limited to 2400 W. With

an 80-A feed, the maximum power supply output is limited to 2500 W while maximum power

supply input power is limited to 2800 W. The system power management software calculates

the available and used power based on DIP switch positions in the PDM.

Juniper MX2020 Hardware Guide

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