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The device has default temperature threshold ranges for fan speeds, as shown in
Table 19 on page 64. If desired, you can change these settings.
The software regularly polls the chassis to obtain the temperature of each thermal
plane, then uses this information to decide whether or not to switch the fan speed.
By default, the device polls the chassis every 60 seconds for temperature data. You
can change this interval using the CLI command chassis poll-time.
If the temperature of a thermal plane exceeds the high temperature level of the
temperature range associated with the current fan speed in the associated plane,
the system will switch the fan speed to the next higher level. for example, let's say
the current fan speed is 3 (medium), and the configured operating temperature
range for fan speed 3 is 40 to 50 degrees centigrade for thermal plane 2. Based on
this configuration, if the temperature of thermal plane 2 rises to 51 degrees
centigrade, the system will automatically increase the fan speed to fan speed 4.
Manual mode: Typically, the fans operate in automatic mode, as described above.
If desired, you can manually set the speed at which the fans will operate. For more
information, see "Manually setting the fan speed" on page 68.
Changing temperature thresholds for thermal planes and fan
speeds on the on the B16S
The B16S cooling system includes six five-speed fans. The fans operate at speeds
of low, medium-low, medium, medium-high, and high. In general, each fan speed,
except for low, has a low and high temperature threshold associated with it as
shown in Figure 30 on page 63. The low fan speed has a high temperature
threshold only.
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Ethernet Switch s-series Installation and User Guide
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