Juniper MX2020 Hardware Manual page 352

NOTE: After a PSM and a PDM are powered on, it can take up to 60 seconds for status
indicators—such as the output status LEDs on the PSM, and the command output on the
craft interface—to indicate that the PSM and PDM are functioning normally. Ignore error
indicators that appear during the first 60 seconds.
10. Verify that the PWR OK LED on the AC PSM faceplate is lit steadily, indicating that PDM is correctly
installed, functioning properly, and providing power to the AC outputs.
11. On the external management device connected to the Routing Engine, monitor the startup process to
verify that the system has booted properly.
12. Verify that the router powers up and goes through the system initialization process.
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