Juniper MX2020 Hardware Manual page 330

NOTE: The DIP switches are only used to indicate presence of a feed. If both feeds are
present, power is always drawn from feed 0. Power will be drawn from feed 1 only if feed
0 fails.
Figure 134: Selecting DC Power Subsystem Feed Redundancy
PWR OK FAULT
INP0 INP1
3. Using both hands, grasp the handle and slide the PSM straight into the chassis until the PSM is fully
seated in the chassis slot. Tighten the two captive screws (see
Figure 136 on page 311) (MX2010), or
(1.13 Nm) to 12 lb-in. (1.35 Nm) of torque to each screw. Do not overtighten the screws.
ON
0 1
Figure 137 on page 312
Figure 135 on page 311
(MX2008). Apply between 10 lb-in.
310
(MX2020) and