Juniper MX2020 Hardware Manual page 503

half of CB-REs and SFBs. Zone 0 is cooled by fan trays 0 and 1. Two fan trays are at the bottom of the
chassis, and two fan trays are at the top of the chassis.
Action
On a regular basis:
Check the LEDs on the craft interface for upper and lower fan trays. The green status LEDs labeled 0 and
1, for lower fan trays, and 2 and 3 for the upper fan trays light steadily when a fan tray is functioning
normally.
During normal operation:
The green LEDs next to the fan trays 0, 1, 2, and 3 on the craft interface light steadily when the fan tray
is functioning normally for that zone.
Issue the show chassis zones command to check the status of the two cooling zones. The output is
similar to the following:
user@host> show chassis zones
ZONE 0 Status
Driving FRU
Temperature
Condition
Num Fans Missing
Num Fans Failed
Fan Duty Cycle
ZONE 1 Status
Driving FRU
Temperature
Condition
Num Fans Missing
Num Fans Failed
Fan Duty Cycle
RELATED DOCUMENTATION
MX2020 Cooling System Description | 45
FPC 9
62 degrees C / 143 degrees F
WARM TEMP
0
0
30
FPC 19
64 degrees C / 147 degrees F
WARM TEMP
0
0
30
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