Juniper MX2010 Hardware Manual page 41

going to the PSMs is split into three individual phases—each PSM works on a single phase. This means
the power system works independent of the kind of AC feed is connected. The user can connect one
or two 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). See
and Figure 7 on page 15.
Figure 6: Power Distribution from Three-Phase Feed Delta PDM to the AC PSMs
AC PS_0
2800W
input
A1
B1
C1
Figure 7: Power Distribution from Three-Phase Feed Wye PDM to the AC PSMs
AC PS_0
2800W
input
NE1
A1
B1
C1
The AC power system is feed redundant—each PSM takes in two AC feeds and uses one of the two.
One AC feed is active at a time. If one feed fails, the PSM automatically switches over to the other feed
without disrupting system function (see
AC PS_3 AC PS_1 AC PS_4
2800W 2800W 2800W
input input input
AC PS_2
2800W
input
AC PS_5
2800W
input
AC PS_1 AC PS_4
2800W 2800W
input input
AC PS_3 AC PS_2 AC PS_5
2800W 2800W 2800W
input input input
"MX2000 Three-Phase Delta AC Power Distribution Module
AC PS_6 AC PS_7
2800W 2800W
input input
AC PS_8
2800W
input
AC PS_7
2800W
input
AC PS_6 AC PS_8
2800W 2800W
input input
Figure 6 on page 15
A2
B2
C2
NE2
A2
B2
C2
15