Acoustic Noise and Fan Speed

Fan & Acoustic Noise

Switch Model Acoustic Information
5520-24T

Typical: Single 350W AC PSU, no VIM

Maximum: Dual 350W AC PSU, 5520-VIM-4YE

Bystander Sound Pressure

  • 39.6 dB(A),0˚C to 35˚C (32˚F to 95˚F) (Typical)
  • 77.5 dB(A), 50˚C (122˚F) (Maximum)

Sound Power

  • 5.1 B, 0˚C to 35˚C (32˚F to 95˚F) (Typical)
  • 8.46 B, 50˚C (122˚F) (Maximum)
5520-24W

Typical: Single 715W AC PSU, no VIM

Maximum: Dual 1100W AC PSU, 5520-VIM-4YE

Bystander Sound Pressure

  • 50.4 dB(A),0˚C to 35˚C (32˚F to 95˚F) (Typical)
  • 67.1 dB(A), 25˚C (77˚F) (Maximum)
  • 78.9 dB(A), 50˚C (122˚F) (Maximum)

Sound Power

  • 6 B, 0˚C to 35˚C (32˚F to 95˚F) (Typical)
  • 7.61 B, 25˚C (77˚F) (Maximum)
  • 8.6 B, 50˚C (122˚F) (Maximum)
5520-48T

Typical: Single 350W AC PSU, no VIM

Maximum: Dual 350W AC PSU, 5520-VIM-4YE

Bystander Sound Pressure

  • 39.0 dB(A),0˚C to 35˚C (32˚F to 95˚F) (Typical)
  • 79.0 dB(A), 50˚C (122˚F) (Maximum)

Sound Power

  • 4.9 B, 0˚C to 35˚C (32˚F to 95˚F) (Typical)
  • 8.52 B, 50˚C (122˚F) (Maximum)
5520-48W

Typical: Single 1100W AC PSU, no VIM

Maximum: Dual 2000W AC PSU (240VAC), 5520-VIM-4YE

Bystander Sound Pressure

  • 64.3 dB(A),0˚C to 35˚C (32˚F to 95˚F) (Typical)
  • 69.1 dB(A), 25˚C (77˚F) (Maximum)
  • 79.4 dB(A), 50˚C (122˚F) (Maximum)

Sound Power

  • 7.24 B, 0˚C to 35˚C (32˚F to 95˚F) (Typical)
  • 7.65 B, 25˚C (77˚F) (Maximum)
  • 8.6 B, 50˚C (122˚F) (Maximum)
5520-12MW-36W

Typical: Single 1100W AC PSU, no VIM

Maximum: Dual 2000W AC PSU (240VAC), 5520-VIM-4YE

Bystander Sound Pressure

  • 62.7 dB(A),0˚C to 35˚C (32˚F to 95˚F) (Typical)
  • 69.2 dB(A), 25˚C (77˚F) (Maximum)
  • 78.8 dB(A), 50˚C (122˚F) (Maximum)

Sound Power

  • 7.25 B, 0˚C to 35˚C (32˚F to 95˚F) (Typical)
  • 7.64 B, 25˚C (77˚F) (Maximum)
  • 8.6 B, 50˚C (122˚F) (Maximum)
5520-48SE

Typical: Single 350W AC PSU, no VIM

Maximum: Dual 350W AC PSU, 5520-VIM-4YE

Bystander Sound Pressure

  • 41.4 dB(A),0˚C to 35˚C (32˚F to 95˚F) (Typical)
  • 77.9 dB(A), 50˚C (122˚F) (Maximum)

Sound Power

  • 5.14 B, 0˚C to 35˚C (32˚F to 95˚F) (Typical)
  • 8.53 B, 50˚C (122˚F) (Maximum)
5520-24X

Typical: Single 350W AC PSU, no VIM

Maximum: Dual 350W AC PSU, 5520-VIM-4YE

Bystander Sound Pressure

  • 40.6 dB(A),0˚C to 35˚C (32˚F to 95˚F) (Typical)
  • 76.9 dB(A), 50˚C (122˚F) (Maximum)

Sound Power

  • 5.05 B, 0˚C to 35˚C (32˚F to 95˚F) (Typical)
  • 8.52 B, 50˚C (122˚F) (Maximum)
5520-24T-ACDC

Typical: F2B Airflow; Single 550W AC PSU, no VIM

Maximum: F2B Airflow; Dual 550W AC PSU, with 5520-VIM-4YE
Bystander Sound Pressure
  • 38.6 dB(A), 0˚C to 40˚C (Typical)
  • 76.5 dB(A), 50˚C (Maximum)
 Sound Power
  • 4.94 B, 0˚C to 40˚C (Typical)
  • 8.60 B, 50˚C (Maximum)

Typical: F2B Airflow; Single 550W DC PSU, no VIM

Maximum: F2B Airflow; Dual 550W DC PSU, with 5520-VIM-4YE
Bystander Sound Pressure
  • 38.2 dB(A), 0˚C to 40˚C (Typical)
  • 77.0 dB(A), 50˚C (Maximum)
 Sound Power
  • 4.89 B, 0˚C to 40˚C (Typical)
  • 8.56 B, 50˚C (Maximum)

Typical: B2F Airflow; Single 550W AC PSU, no VIM

Maximum: B2F Airflow; Dual 550W AC PSU, with 5520-VIM-4YE
Bystander Sound Pressure
  • 38.46dB(A), 0˚C to 40˚C (Typical)
  • 76.6 dB(A), 50˚C (Maximum)
 Sound Power
  • 4.99 B, 0˚C to 40˚C (Typical)
  • 8.61 B, 50˚C (Maximum)

Typical: B2F Airflow; Single 550W DC PSU, no VIM

Maximum: B2F Airflow; Dual 550W DC PSU, with 5520-VIM-4YE
Bystander Sound Pressure
  • 39.8 dB(A), 0˚C to 40˚C (Typical)
  • 79.0 dB(A), 50˚C (Maximum)
 Sound Power
  • 5.03 B, 0˚C to 40˚C (Typical)
  • 8.69 B, 50˚C (Maximum)
5520-48T-ACDC

Typical:F2B Airflow; Single 550W AC PSU, no VIM

Maximum: F2B Airflow; Dual 550W AC PSU, with 5520-VIM-4YE
Bystander Sound Pressure
  • 38.2 dB(A), 0˚C to 40˚C (Typical)
  • 76.4 dB(A), 50˚C (Maximum)
 Sound Power
  • 4.91 B, 0˚C to 40˚C (Typical)
  • 8.58 B, 50˚C (Maximum)

Typical: F2B Airflow; Single 550W DC PSU, no VIM

Maximum: F2B Airflow; Dual 550W DC PSU, with 5520-VIM-4YE
Bystander Sound Pressure
  • 38.1 dB(A), 0˚C to 40˚C (Typical)
  • 77.1 dB(A), 50˚C (Maximum)
 Sound Power
  • 4.88 B, 0˚C to 40˚C (Typical)
  • 8.55 B, 50˚C (Maximum)

Typical: B2F Airflow; Single 550W AC PSU, no VIM

Maximum: B2F Airflow; Dual 550W AC PSU, with 5520-VIM-4YE
Bystander Sound Pressure
  • 38.5 dB(A), 0˚C to 40˚C (Typical)
  • 76.7 dB(A), 50˚C (Maximum)
 Sound Power
  • 4.94 B, 0˚C to 40˚C (Typical)
  • 8.54 B, 50˚C (Maximum)

Typical: B2F Airflow; Single 550W DC PSU, no VIM

Maximum: B2F Airflow; Dual 550W DC PSU, with 5520-VIM-4YE
Bystander Sound Pressure
  • 39.6 dB(A), 0˚C to 40˚C (Typical)
  • 79.0 dB(A), 50˚C (Maximum)
 Sound Power
  • 5.00 B, 0˚C to 40˚C (Typical)
  • 8.70 B, 50˚C (Maximum)
5520-48SE-ACDC

Typical: F2B Airflow; Single 550W AC PSU, no VIM

Maximum: F2B Airflow; Dual 550W AC PSU, with 5520-VIM-4YE
Bystander Sound Pressure
  • 39.0 dB(A), 0˚C to 40˚C (Typical)
  • 76.6 dB(A), 50˚C (Maximum)
 Sound Power
  • 4.98 B, 0˚C to 40˚C (Typical)
  • 8.65 B, 50˚C (Maximum)

Typical: F2B Airflow; Single 550W DC PSU, no VIM

Maximum: F2B Airflow; Dual 550W DC PSU, with 5520-VIM-4YE
Bystander Sound Pressure
  • 38.7 dB(A), 0˚C to 40˚C (Typical)
  • 77.2 dB(A), 50˚C (Maximum)
 Sound Power
  • 4.96 B, 0˚C to 40˚C (Typical)
  • 8.64 B, 50˚C (Maximum)

Typical: B2F Airflow; Single 550W AC PSU, no VIM

Maximum: B2F Airflow; Dual 550W AC PSU, with 5520-VIM-4YE
Bystander Sound Pressure
  • 38.9 dB(A), 0˚C to 40˚C (Typical)
  • 77.4 dB(A), 50˚C (Maximum)
 Sound Power
  • 4.95 B, 0˚C to 40˚C (Typical)
  • 8.65 B, 50˚C (Maximum)

Typical: B2F Airflow; Single 550W DC PSU, no VIM

Maximum: B2F Airflow; Dual 550W DC PSU, with 5520-VIM-4YE
Bystander Sound Pressure
  • 40.2 dB(A), 0˚C to 40˚C (Typical)
  • 79.5 dB(A), 50˚C (Maximum)
 Sound Power
  • 5.04 B, 0˚C to 40˚C (Typical)
  • 8.75 B, 50˚C (Maximum)
5520-24X-ACDC

Typical: F2B Airflow; Single 550W AC PSU, no VIM

Maximum: F2B Airflow; Dual 550W AC PSU, with 5520-VIM-4YE
Bystander Sound Pressure
  • 38.1 dB(A), 0˚C to 40˚C (Typical)
  • 75.8 dB(A), 50˚C (Maximum)
 Sound Power
  • 4.90 B, 0˚C to 40˚C (Typical)
  • 8.59 B, 50˚C (Maximum)

Typical: F2B Airflow; Single 550W DC PSU, no VIM

Maximum: F2B Airflow; Dual 550W DC PSU, with 5520-VIM-4YE
Bystander Sound Pressure
  • 38.0 dB(A), 0˚C to 40˚C (Typical)
  • 76.6 dB(A), 50˚C (Maximum)
 Sound Power
  • 4.88 B, 0˚C to 40˚C (Typical)
  • 8.53 B, 50˚C (Maximum)

Typical: B2F Airflow; Single 550W AC PSU, no VIM

Maximum: B2F Airflow; Dual 550W AC PSU, with 5520-VIM-4YE
Bystander Sound Pressure
  • 38.3 dB(A), 0˚C to 40˚C (Typical)
  • 77.3 dB(A), 50˚C (Maximum)
 Sound Power
  • 4.94 B, 0˚C to 40˚C (Typical)
  • 8.64 B, 50˚C (Maximum)

Typical: B2F Airflow; Single 550W DC PSU, no VIM

Maximum: B2F Airflow; Dual 550W DC PSU, with 5520-VIM-4YE
Bystander Sound Pressure
  • 40.1 dB(A), 0˚C to 40˚C (Typical)
  • 79.3 dB(A), 50˚C (Maximum)
 Sound Power
  • 4.94 B, 0˚C to 40˚C (Typical)
  • 8.73 B, 50˚C (Maximum)
Table 1. 5520 Fan Speed and Power Consumption
Fan Speed Fan Module RPM (typical) Power
Inlet Fan Outlet Fan Typical
Full (100%) 21000 19000 12V*1.7A = 20.4W per module*
Low (20%) 4200 3800 2W (per module)

* Some units are equipped with (2) fan module, while others are equipped with 3. Total fan power is equal to the number of installed fan modules multiplied by the fan power for each module.

Fan Speed and Temperature Variation

The speed of the fan increases only when the temperature of the device increases. Fan speed is not dependent on any fan failures.

9036817-00 Rev. AU