Juniper MX2010 Hardware Manual page 119

Table 30: MX2010 DC Power Components (continued)
Component
DC Power Distribution Modules (240 V
China)
DC Power Supply Modules (PSMs)
Table 31: MX2010 AC Power Components
Component
AC power system
Description
In the DC PDM (240 V China) power configuration, the router contains
up to two DC PDMs located at the rear of the chassis in slots
PDM0/Input0 and PDM1/Input1 (bottom to top). A minimum of one
PDM is required per system. Two PDMs provide full redundancy. The
DC PDM provides a power interface to nine PSMs. If feeds that connect
to one PDM fail in a redundant configuration, the other feed will provide
full power. You can install a total of two PDMs into a router. Each DC
PDM (240 V China) operates with nine feeds.
The MX2010 DC PSMs (-48 V and 240 V China) are hot-removable
and hot-insertable. The DC PSMs are a dual redundant feed (INP0 and
INP1). To provide feed redundancy, you can connect each DC PSM to
two separate feeds from different sources. When both input feeds are
present, power is drawn from the feed supplying higher DC voltage.
You can set these feeds by using the input mode DIP switch located
on the DC PSM (see "MX2010 DC Power Supply Module (-48 V)
Description" on page 116). There are two PDMs per power system
capable of carrying seven feeds or nine feeds each. The 240 V China
PDM has nine feeds. Each DC PSM is capable of delivering 2500 W of
power if -48 V/80 A is applied to the -48 V PSM, and 240 V/16 A is
applied to the China 240 VDC PSM.
Description
The MX2010 supports connection of a single-phase or three-phase
(delta or wye) AC power system. In the three-phase power systems,
the AC power going to the PSMs is split into three individual phases
(wye) or a pair of phases (delta). Each PSM works on a single phase;
therefore, the power system works independent of the type of AC feed
connected. You can connect one or two AC feeds, depending on the
power system configuration (number of PSMs, redundancy, and so on).
Each phase from each of the two feeds is distributed among one or two
PSMs. One feed has each phase going to two PSMs, and the other feed
has each phase going to a single PSM.
The single-phase AC PDM provides an AC input connection from the
single-phase AC power source, and also provides an input power
interface to the PSM through a system power midplane.
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