Heat Dissipation; Environmental Specifications; Noise - HP FlexFabric 12900 series Installation Manual

The minimum system power consumption is the total static power consumption of all cards plus the
•
minimum fan tray power consumption. For example, for a 12910 AC switch that has two
LSX1SUP10A1 MPUs, two LSX1TGS48EA1 LPUs, six LSX1FAB10B1 switching fabric modules, and
two 12910 fan trays, the minimum system power consumption of the switch is 2 × 45 + 2 × 310+ 6
× 135 + 2 × 196= 1912 W.
• The maximum system power consumption is the total dynamic power consumption of all cards plus
the maximum fan tray power consumption. For example, for a 12910 AC switch that has two
LSX1SUP10A1 MPUs, two LSX1TGS48EA1 LPUs, six LSX1FAB10B1 switching fabric modules, and
two 12910 fan trays, the maximum system power consumption of the switch is 2 × 50 + 2 × 435 +
6 × 170 +2 × 1377 = 4744 W.

Heat dissipation

Heat dissipation is measured in BTU/h, and 1 W equals 3.4121BTU/h.
The heat dissipation of a switch depends on its power consumption. To calculate heat dissipation of the
switch, assume 90% power consumption is converted to heat, and the efficiency of the power supply is
90%. Heat dissipation/hour of the switch is 0.9 × (total power consumption of the cards plus power
consumption of the fan tray)/0.9 × 3.4121.
For the power consumption of the cards and fan trays of the HP FlexFabric 12900 switches, see
power consumption and system power

Environmental specifications

Table 17 Environmental specifications
Description
Temperature
Relative humidity
(noncondensing)

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 18 Sound pressure levels
Model
12910 AC (two fan trays)
NOTE:
The sound pressure levels are measured according to the method specified in ISO 7779 at the bystander
position.
consumption."
Operating
0°C to 45°C (32°F to 113°F)
10% to 95%
Table 18.
Sound pressure level under
normal temperature
67.7 dBA
69
Non-operating
–40°C to +70°C (–40°F to +158°F)
5% to 95%
Sound pressure level when the
fan tray operates at full speed
83.9 dBA
"Module