Juniper MX2020 Hardware Manual page 579

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Copyright © 2015, Juniper Networks, Inc.
If all PSMs have failed, the system temperature might have exceeded the threshold,
9.
causing the system to shut down.
NOTE: On the display and in the CLI, the PSMs are referred to as
through
PSM8
If the system temperature exceeds the threshold, the Junos OS shuts
down all PSMs so that no status is displayed.
The Junos OS also can shut down one of the PSMs for other reasons. In
this case, the remaining PSMs provide power to the router, and you can
still view the system status through the CLI or display.
If you cannot determine the cause of the problem or need additional assistance, see
10.
"Contacting Customer Support" on page
MX2020 Craft Interface Description on page 37
MX2020 DC Power Supply Module Description on page 96
MX2020 DC Power Distribution Module Description on page 94
MX2020 AC Power Supply Module Description on page 158
MX2020 Three-Phase Delta AC Power Distribution Module Description on page 86
MX2020 Three-Phase Wye AC Power Distribution Module Description on page 88
Replacing an MX2020 DC Power Supply Module on page 454
Replacing an MX2020 DC Power Distribution Module on page 457
Replacing an MX2020 AC Power Supply Module on page 428
Replacing an MX2020 Three-Phase Delta AC Power Distribution Module on page 510
Replacing an MX2020 Three-Phase Wye AC Power Distribution Module on page 518
MX2020 Troubleshooting Resources on page 531
Chapter 27: Troubleshooting Components
(bottom) and through
PSM9
549.
PSM0
(top).
PSM17
547