Extreme Networks 7720 - Acoustic Noise and Fan Speed Specifications

Acoustic Noise and Fan Speed
Acoustic Noise
The following table includes acoustic specications of the Extreme 7720 Series
switches.
Switch Model Bystander Sound Pressure (at
27°C)
Declared Sound Power (at
27°C)
7720-32C (AC/DC PSU with
front-to-back airow)
45 dB(A) 6.9 bels
7720-32C (AC/DC PSU with
back-to-front airow)
52 dB(A) 7.3 bels
Fan Tray and Speed Variation
Fan speeds are adjusted based on calculations of the temperatures on all sensors. Due
to one fan being located behind the other, air pushed from one fan can cause the other
fan in the module to run at a higher speed. One fan can run at medium speed while
the other can spin at high speed if one is close to the temperature boundary.
Table 17: Fan Tray and Speed Variation
Description Operation Status Operation Speed Airow Direction
Tray 1 Fan 1 up high speed Unknown*
Tray 1 Fan 2 up medium speed Unknown*
Tray 2 Fan 1 up high speed Unknown*
Tray 2 Fan 2 up medium speed Unknown*
Tray 3 Fan 1 up high speed Unknown*
Tray 3 Fan 2 up medium speed Unknown*
Tray 4 Fan 1 up high speed Unknown*
Tray 4 Fan 2 up medium speed Unknown*
Tray 5 Fan 1 up high speed Unknown*
Tray 5 Fan 2 up medium speed Unknown*
Tray 6 Fan 1 up high speed Unknown*
Tray 6 Fan 2 up medium speed Unknown*
* - The color of the tab on the fan tray indicates the airow direction:
• Red = Front-to-Back
• Blue = Back-to-Front
Technical Specications Acoustic Noise and Fan Speed
Extreme 7720 Hardware Installation Guide 83