Juniper QFX5220, Hardware Manual, Page: 176 / 247

It is also helpful to calculate the percentage of fan RPM, or duty cycle, use the following in root:
root@re0.
~#i2cget -y -f 13 0x66 0x11
0x07
In this example, the system returned the hexadecimal value 0x07. Convert that value to decimal, which is
7 in this example. Then use this formula to get the duty cycle:
Duty cycle = (value re 1)*6.25%
In this example, duty cycle = (7 +1)*6.25 = 50%
Chassis Alarm Messages
Chassis alarms indicate a failure on the device or one of its components. Chassis alarms are preset and
cannot be modified.
Chassis alarms on QFX5220 devices have two severity levels:
•
Major (red)—Indicates a critical situation on the device that has resulted from one of the conditions
described in Table 42 on page 182 . A red alarm condition requires immediate action.
•
Minor (yellow)—Indicates a noncritical condition on the device that, if left unchecked, might cause an
interruption in service or degradation in performance. A yellow alarm condition requires monitoring or
maintenance.
Table 42 on page 182 describes the chassis alarm messages on QFX5220.
Junos OS Evolved systems, such as QFX5220, are based on a new alarm infrastructure, not all power
supplies and fan alarms are supported. Table 42 on page 182 shows these alarms.
181