69
•
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 consumption
Environmental specifications
Table 17
Environmental specifications
Description Operating
Non-operating
Temperature
0°C to 45°C (32°F to 113°F)
–40°C to +70°C (–40°F to +158°F)
Relative humidity
(noncondensing)
10% 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 18
Sound pressure levels
Model
Sound pressure level under
normal temperature
Sound pressure level when the
fan tray operates at full speed
12910 AC (two fan trays)
67.7 dBA
83.9 dBA
NOTE:
The sound pressure levels are measured according to the method specified in ISO 7779 at the bystander
position.