Juniper MX2020 Hardware Guide

For the fan trays, the output for the show chassis environment command is similar to the following:
user@host> show chassis environment
Class Item Status Measurement
Temp PSM 0 Absent
PSM 1 Absent
PSM 2 Absent
PSM 3 Absent
PSM 4 OK 34 degrees C / 93 degrees F
PSM 5 OK 31 degrees C / 87 degrees F
PSM 6 OK 30 degrees C / 86 degrees F
PSM 7 OK 30 degrees C / 86 degrees F
PSM 8 OK 31 degrees C / 87 degrees F
PSM 9 Absent
PSM 10 Absent
PSM 11 Absent
PSM 12 Absent
PSM 13 OK 32 degrees C / 89 degrees F
PSM 14 OK 31 degrees C / 87 degrees F
PSM 15 OK 30 degrees C / 86 degrees F
PSM 16 OK 30 degrees C / 86 degrees F
PSM 17 OK 30 degrees C / 86 degrees F
PDM 0 OK
PDM 1 OK
PDM 2 OK
PDM 3 OK
CB 0 IntakeA-Zone0 OK 25 degrees C / 77 degrees F
CB 0 IntakeB-Zone1 OK 29 degrees C / 84 degrees F
CB 0 IntakeC-Zone0 OK 28 degrees C / 82 degrees F
CB 0 ExhaustA-Zone0 OK 27 degrees C / 80 degrees F
CB 0 ExhaustB-Zone1 OK 28 degrees C / 82 degrees F
CB 0 TCBC-Zone0 OK 32 degrees C / 89 degrees F
CB 1 IntakeA-Zone0 OK 30 degrees C / 86 degrees F
CB 1 IntakeB-Zone1 OK 25 degrees C / 77 degrees F
CB 1 IntakeC-Zone0 OK 39 degrees C / 102 degrees F
CB 1 ExhaustA-Zone0 OK 33 degrees C / 91 degrees F
CB 1 ExhaustB-Zone1 OK 28 degrees C / 82 degrees F
CB 1 TCBC-Zone0 OK 32 degrees C / 89 degrees F
SPMB 0 Intake OK 30 degrees C / 86 degrees F
SPMB 1 Intake OK 24 degrees C / 75 degrees F
Routing Engine 0 OK 35 degrees C / 95 degrees F
Routing Engine 0 CPU OK 31 degrees C / 87 degrees F
Routing Engine 1 OK 27 degrees C / 80 degrees F
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Juniper MX2020 Specifications

General

Brand	Juniper
Model	MX2020
Category	Network Router
Language	English