Juniper MX2020 Hardware Manual page 501

Fan Tray 2 Fan 6
Fan Tray 3 Fan 1
Fan Tray 3 Fan 2
Fan Tray 3 Fan 3
Fan Tray 3 Fan 4
Fan Tray 3 Fan 5
Fan Tray 3 Fan 6
Fan Tray 0, Fan Tray 1 refer to the lower rear fan trays, Fan Tray 2, and Fan Tray 3 refer to the upper rear
fan trays.
Fan 1, Fan 2, Fan 3, Fan 4, Fan 5, and Fan 6 refer to the fans on the fan tray. There are six fans for each
fan tray.
SEE ALSO
MX2020 Cooling System Description | 45
Troubleshooting the MX2020 Cooling System | 678
MX2020 Component LEDs on the Craft Interface
Replacing an MX2020 Fan Tray | 437
Maintaining the MX2020 Cooling System Zones
Purpose
For optimum router performance, verify the status of the two cooling zones of the chassis. Both Zone 0
and Zone 1 cool the Control Board and Routing Engine (CB-RE). Zone 1 consist of ten MPCs (10 through
19) and their respective MICs, along with the top half of the CB-REs and SFBs. Zone 1 is cooled by fan
trays 2 and 3. Zone 0 consists of ten MPCs (0 through 9), and their respective MICs, along with the bottom
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:
OK 29% 2640 RPM
OK 38% 3480 RPM
OK 40% 3600 RPM
OK 38% 3480 RPM
OK 38% 3480 RPM
OK 38% 3480 RPM
OK 38% 3480 RPM
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