Juniper MX2010 Hardware Manual page 134

of one PDM is required per system (two PDMs per MX2010 chassis) for nonredundant power. The DC
PDM provides a power interface to nine power supply modules (PSMs).
Two PDMs provide full redundancy. In a redundant configuration, a total of fourteen 60-A or 80-A input
feeds (7-feed DC PDMs), and a total of eighteen 60-A or 80-A input feeds (9-feed DC PDMs) are supported.
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). 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 43 on page 112 shows the MX2010 DC PDM.
Figure 43: MX2010 DC PDM
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 the 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.
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