Environmental specifications
Table 12
Environmental specifications
Item Operating environment
Non-operating environment
Temperature
0°C to 40°C (32°F to 104°F)
–40°C to +70°C (–40°F to +158°F)
Relative humidity
(noncondensing)
5% to 95%
5% to 95%
Noise
The switch uses fans with the automatic speed adjustment function, so the sound pressure levels vary by
fan speed. For more information, see
Table 13
Sound pressure levels
Model
Sound pressure level under room
temperature
Sound pressure level when the fan
tray operates at full speed
HP 7904 (two fan trays)
59.8 dB
76.3 dB
NOTE:
The sound pressure levels are measured according to the method specified in ISO 7779 at the bystander
position.
Other specifications
Table 14
Other specifications
Model
System leakage current
standard
Fusing current
Fireproofing standard
HP 7904
EN60950-1
GB4943
IEC60950-1
UL60950-1
15 A
EN60950-1
GB4943
IEC60950-1
UL60950-1
Cooling system
The cooling system of the switch comprises the air vents in the chassis, fan tray, and built-in fans of power
supplies. To guarantee the performance of this cooling system, consider the ventilation design for the
installation site when you choose a fan tray assembly and plan the installation site for the switch.
•
When a back-to-front airflow fan tray (JG839A) is used, ambient air flows in through the air vents
in the fan tray panel and the power supply panels, circulates through the chassis and the power
supplies, and exhausts at the port side, as shown in
.
44
Summary of Contents for FlexFabric 7900 Series
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