Connecting Power to a DC-Powered MX2020 Router with Power
Distribution Modules (-48 V)
WARNING: Before performing DC power procedures, ensure that power is removed
from the DC circuit. To ensure that all power is OFF, locate the circuit breaker on the
panel board that services the DC circuit, switch the circuit breaker to the OFF position,
and tape the switch handle of the circuit breaker in the OFF position.
You connect DC power to the router by attaching power cables from the external DC power sources to
the terminal studs on the PDM faceplates. You must provide the power cables (the cable lugs are not
supplied with the router).
To connect the DC source power cables to the router:
1. Switch off the dedicated customer site circuit breakers. Ensure that the voltage across the DC power
source cable leads is 0 V and that there is no chance that the cable leads might become active during
installation.
2. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to
one of the ESD points on the chassis.
NOTE: If the PSMs are installed in the router, make sure the power switches on all PSMs
are turned to the off (O) position.
3. Move the DC circuit feed switch on the PDM faceplate to match the current rating amperage—60 A,
or 80 A for each feed.
NOTE: The switch position applies to all inputs of this PDM. Selecting the 60 A position
may reduce power output capacity available from each PSM.
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