Installing MX2020 AC Power Supply Modules
To install an MX2020 AC PSM:
- Verify that the
power switch on the PSM is in the off (
O
) position. - On the PSM, slide the plastic cover away from the input
mode switch to expose the dual DIP switches. Move the input mode DIP
switch
0
(left switch) to theON
position for the bottom feedINP0
(expected to be connected), and DIP switch1
(right switch) to theON
position for the top feedINP1
(expected to be connected). If both DIP switches0
and1
are turned to theON
position, then both top and bottom feeds are expected to be connected (see Figure 1).In addition, a PSM failure triggers the alarm LED on the craft interface.
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 feed1
only if feed0
fails.Figure 1: Selecting AC Power Subsystem Feed Redundancy - 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 2). Apply between
10 lb-in. (1.13 Nm) to 12 lb-in. (1.35 Nm) of
torque to each screw. Do not overtighten the screws.
Figure 2: MX2020 Router with AC Power Supply Modules Installed - Verify that the
INP0
and/orINP1
LEDs on the PSM are lit green steadily (see Figure 3).Note If you are connecting two feeds,
INP0
andINP1
, both LEDs on the PSM will be lit green steadily. - Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
- Move the switch to the on (
|
) position. - Verify that the
PWR OK
LED is lit green steadily. See MX2020 AC Power Supply Module LEDs for information on MX2020 AC PSM LEDs. - Repeat Steps 1 through 7 for installing PSMs in slots
0
,1
, and2
, where required.Figure 3: MX2020 AC Power Supply Module Front View Note Each PSM slot not occupied by a AC PSM must be covered by a PSM blank panel.