Table of Contents
Advertisement
Table 8: Fan Tray Specifications
Specification
Height
Width
Depth
Weight
Copyright © 2019, Juniper Networks, Inc.
See
Table 8 on page 43
for the physical specifications for the fan trays.
Value
22.4 in. (56.9 cm)
6.6 in. (16.8 cm)
4.0 in. (10.2 cm) without handles, 5.2 in. (13.2 cm) with handles
11.8 lbs. (5.4 kg)
Only remove one fan tray when replacing an existing fan tray while the switch is running.
The switch continues to operate for a limited time with a single operating fan tray without
triggering a thermal alarm.
CAUTION:
To avoid a thermal alarm, do not remove both fan trays while the
switch is operating.
CAUTION:
The chassis will shut down if a thermal alarm is raised for more
than three minutes.
The internal fan Control Board in each fan tray contains the LEDs for the associated fan
tray controllers and the LEDs for the three Switch Interface Boards (SIBs) directly behind
the fan tray.
Fan Tray Controller
The two fan tray controllers provide the control logic and power to hot-insert and
hot-remove a fan tray. The fans in each fan tray are numbered 0 through 10.
The system continually monitors the temperature of critical parts across the chassis and
adjusts the chassis fan speed according to the temperature.
Software controls the fan speed. Under normal operating conditions, the fans in the fan
tray run at less than full speed. If one fan tray controller fails or appears missing (such
as when a SIB is being replaced) the other fan tray controller sets the fans to full speed.
This allows the switch to continue to operate normally as long as the remaining fans cool
the chassis sufficiently. Use the
fans and fan speed. For example:
root> show chassis fan
Item
Fan Tray 0 Fan 0
Fan Tray 0 Fan 1
Fan Tray 0 Fan 2
Fan Tray 0 Fan 3
show chassis fan
command to see the status of individual
Status
RPM
OK
6300
OK
6150
OK
6300
OK
6300
Chapter 1: Overview
Measurement
Spinning at normal speed
Spinning at normal speed
Spinning at normal speed
Spinning at normal speed
43
Advertisement
Chapters
Table of Contents
