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Technical Specifications
Acoustic Noise and Fan Speed
Acoustic Noise
The following table includes acoustic specifications of the Extreme 7720 Series
switches.
Switch Model
7720-32C (AC/DC PSU with
front-to-back airflow)
7720-32C (AC/DC PSU with
back-to-front airflow)
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
Tray 1 Fan 1
Tray 1 Fan 2
Tray 2 Fan 1
Tray 2 Fan 2
Tray 3 Fan 1
Tray 3 Fan 2
Tray 4 Fan 1
Tray 4 Fan 2
Tray 5 Fan 1
Tray 5 Fan 2
Tray 6 Fan 1
Tray 6 Fan 2
* - The color of the tab on the fan tray indicates the airflow direction:
•
Red = Front-to-Back
•
Blue = Back-to-Front
Bystander Sound Pressure (at
27°C)
45 dB(A)
52 dB(A)
Operation Status
up
up
up
up
up
up
up
up
up
up
up
up
Extreme 7720 Hardware Installation Guide
Acoustic Noise and Fan Speed
Declared Sound Power (at
27°C)
6.9 bels
7.3 bels
Operation Speed
high speed
medium speed
high speed
medium speed
high speed
medium speed
high speed
medium speed
high speed
medium speed
high speed
medium speed
Airflow Direction
Unknown*
Unknown*
Unknown*
Unknown*
Unknown*
Unknown*
Unknown*
Unknown*
Unknown*
Unknown*
Unknown*
Unknown*
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