Juniper MX960 Hardware Manual page 603

Action
Monitor the status of the fans. A fan tray contains multiple fans that work in unison to cool the router
components. If one fan fails, the host subsystem adjusts the speed of the remaining fans to maintain
proper cooling. A red alarm is triggered when a fan fails, and a yellow alarm and red alarm is triggered
when a fan tray is removed.
To display the status of the cooling system, issue the show chassis environment command. The output
is similar to the following:
user@host> show chassis environment
Class Item
Temp PEM 0
PEM 1
PEM 2
PEM 3
Routing Engine 0
Routing Engine 1
CB 0 Intake
CB 0 Exhaust A
CB 0 Exhaust B
CB 0 ACBC
CB 0 SF A
CB 0 SF B
CB 1 Intake
CB 1 Exhaust A
CB 1 Exhaust B
CB 1 ACBC
CB 1 SF A
CB 1 SF B
CB 2 Intake
CB 2 Exhaust A
CB 2 Exhaust B
CB 2 ACBC
CB 2 SF A
CB 2 SF B
FPC 2 Intake
FPC 2 Exhaust A
FPC 2 Exhaust B
FPC 2 I3 0 TSensor
FPC 2 I3 0 Chip
FPC 2 I3 1 TSensor
FPC 2 I3 1 Chip
FPC 2 I3 2 TSensor
Status Measurement
OK 40 degrees C / 104 degrees F
Absent
Absent
OK 40 degrees C / 104 degrees F
OK 39 degrees C / 102 degrees F
OK 42 degrees C / 107 degrees F
OK 26 degrees C / 78 degrees F
OK 27 degrees C / 80 degrees F
OK 27 degrees C / 80 degrees F
OK 26 degrees C / 78 degrees F
OK 37 degrees C / 98 degrees F
OK 35 degrees C / 95 degrees F
OK 27 degrees C / 80 degrees F
OK 30 degrees C / 86 degrees F
OK 28 degrees C / 82 degrees F
OK 27 degrees C / 80 degrees F
OK 36 degrees C / 96 degrees F
OK 36 degrees C / 96 degrees F
Absent
Absent
Absent
Absent
Absent
Absent
OK 22 degrees C / 71 degrees F
OK 27 degrees C / 80 degrees F
OK 33 degrees C / 91 degrees F
OK 33 degrees C / 91 degrees F
OK 35 degrees C / 95 degrees F
OK 33 degrees C / 91 degrees F
OK 33 degrees C / 91 degrees F
OK 33 degrees C / 91 degrees F
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