Juniper EX4500 Hardware Manual page 255

Temperature sensors in the chassis monitor the temperature of the chassis. The switch raises an alarm if
a fan fails or if the temperature of the chassis exceeds permissible levels.
Solution
When the switch raises a temperature alarm such as the FPC 0 EX-PFE1 Temp Too Hot alarm, use the
show chassis environment and the show chassis temperature-thresholds commands to identify the
condition that triggered the alarm.
CAUTION:
exceeds the maximum recommended ambient temperature. To prevent airflow
restriction, allow at least 6 inches (15.2 cm) of clearance around the ventilation
openings.
1. Connect to the switch by using Telnet and issue the show chassis environment command. This command
displays environmental information about the switch chassis, including the temperature, and information
about the fans, power supplies, and Routing Engines. Following is a sample output on an EX9208 switch.
The output is similar on other EX Series switches.
user@switch> show chassis environment
Class Item
Temp PEM 0
PEM 1
PEM 2
PEM 3
Routing Engine 0
Routing Engine 0 CPU
Routing Engine 1
Routing Engine 1 CPU
CB 0 Intake
CB 0 Exhaust A
CB 0 Exhaust B
CB 0 ACBC
CB 0 XF A
CB 0 XF B
CB 1 Intake
CB 1 Exhaust A
CB 1 Exhaust B
CB 1 ACBC
CB 1 XF A
CB 1 XF B
FPC 3 Intake
To prevent the switch from overheating, do not operate it in an area that
Status
OK
OK
Absent
Absent
OK
OK
Absent
Absent
OK
OK
OK
OK
OK
OK
Absent
Absent
Absent
Absent
Absent
Absent
OK
Measurement
40 degrees C / 104 degrees F
40 degrees C / 104 degrees F
37 degrees C / 98 degrees F
35 degrees C / 95 degrees F
36 degrees C / 96 degrees F
34 degrees C / 93 degrees F
40 degrees C / 104 degrees F
39 degrees C / 102 degrees F
46 degrees C / 114 degrees F
45 degrees C / 113 degrees F
48 degrees C / 118 degrees F
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