Fans
Each model integrates multiple temperature sensors that automatically regulate the fan
speed. A half-width model integrates three internal fans. A full-width model integrates
four internal fans.
The switch includes internal fans that support intelligent operation, which enables the
switch to automatically start the operation of the fans, gradually increase the speed of
the fans, and either halt PoE or block traffic if the internal switch temperature exceeds
a critical level.
The fans function with variable speeds, depending on the internal switch temperature,
use of the PoE budget, and traffic load. The fan speed can temporarily reach 100 percent.
In Quiet mode, the switch might automatically change back and forth between Cool
mode and Quiet mode until the detected internal switch temperature or use of the PoE
budget returns within safe operational thresholds. A full traffic load can also cause the
internal switch temperature to increase and the fans to function in Cool mode.
The fans support the following modes:
•
Quiet: Quiet mode is the default mode. At approximate 30 percent speed, the fans
produce minimal sound. At higher speeds, the sound of the fans becomes more
noticeable. At 100 percent speed, the fans produce significant noise.
Table 13. Quiet mode fan settings
Acoustic Noise
Range
Internal Switch
Temp. (Top)
Room Temp.
Range
Fan Duty RangePoE Power LoadModel number
33dBA to
52dBA
33.1°C to
48.2°C
25°C to
45°C
28 to
60
720W
720W
M4350-24G4XF
33dBA to
52dBA
33.4°C to
48.5°C
25°C to
45°C
28 to
60
1440W
1440W
M4350-48G4XF
34dBA to
52dBA
43.3°C to
50.1°C
25°C to
45°C
28 to
60
3314W
3314W
M4350-44M4X4V
34dBA to
56dBA
34.4°C to
51.7°C
25°C to
50°C
27 to
70
N/A
N/A
M4350-8X8F
34dBA to
64dBA
31.9°C to
51.5°C
25°C to
50°C
27 to
100
N/A
N/A
M4350-12X12F
Hardware Installation Guide44Hardware Overview
Fully Managed Switches M4350 Series