Juniper MX2010, Hardware Manual

Page: 139 / 825

Figure 47: DC Power Supply Module
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The DC power system is feed redundant. Each DC PSM can be connected to two separate feeds from
different sources that are used to provide feed redundancy. If two feeds are connected, PSM input power
is drawn from the feed with the higher voltage present. There are two PDMs per power system capable
of carrying nine feeds each. Connect feeds from one source to one PDM and feeds from the other source
to the second PDM of the power system. The primary input of the PSM is a dual redundant feed, INP0
and INP1. Both feeds are active during operation, but both feeds might or might not be providing current.
Move the input mode DIP switch to the on or off position to determine the power supply feeds (see
Table 38 on page 117 and Figure 48 on page 118 ). In addition, a PSM failure triggers the alarm LED on the
craft interface. Each PDM has an LED per feed indicating whether the feed is active or not, or whether
the feed is connected properly, see “MX2010 DC Power (-48 V) System Electrical Specifications” on
page 201 .
Table 38: DIP Switch Positions on the DC PSM
Input Source Right Switch Position Left Switch Position
None Off Off
Input 0 (INP0) Off On
Input 1 (INP1) On Off
Both Input 0 and Input 1 On On
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