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 FPC 9
Temperature 62 degrees C / 143 degrees F
Condition WARM TEMP
Num Fans Missing 0
Num Fans Failed 0
Fan Duty Cycle 30
ZONE 1 Status
Driving FRU FPC 19
Temperature 64 degrees C / 147 degrees F
Condition WARM TEMP
Num Fans Missing 0
Num Fans Failed 0
Fan Duty Cycle 30
RELATED DOCUMENTATION
MX2020 Cooling System Description | 45
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