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Appendix B
System Specifications
Environmental Specifications
97
Environmental Specifications
This section provides the environmental, power dissipation, noise emission, and air flow specifications for the
hp rp7405/rp7410 server.
Temperature and Humidity
The cabinet is actively cooled using forced convection in a Class C1-modified environment.
Operating Environment
The system is designed to run continuously and meet reliability goals in an ambient temperature of 5° C - 35°
C at sea level. The maximum allowable temperature is derated 1° C per 1000 feet of elevation above 5000 feet
above sea level up to 30° C at 10,000 feet. For optimum reliability and performance, the recommended
operating range is 20° C to 25° C
Environmental Temperature Sensor
To ensure that the system is operating within the published limits, the ambient operating temperature is
measured using a sensor placed near the chassis inlet, between the cell boards. Data from the sensor is used
to control the fan speed and also to initiate system overtemp shutdown. (For more details see the platform
management section.)
Non-Operating Environment
The system is designed to withstand ambient temperatures between -40° C to 70° C under non-operating
conditions.
Cooling
Cell Section Cooling
The cabinet incorporates front to back airflow across the cell boards and system backplane. Two (2) 150mm
fans, mounted externally on the front chassis wall behind the cosmetic front bezel, push air into the Cell
section; and two (2) 150mm fans housed in cosmetic plastic fan carriers and mounted externally to the rear
chassis wall, pull air through the Cell section.
Each cell area fan cooling is controlled by a smart fan control board, embedded in the fan module plastic
housing. The smart fan control board receives fan control input from the system fan controller on the system
backplane and returns fan status information to the system fan controller. The smart fan control board also
controls the power and the pulse width modulated control signal to the fan and monitors the speed indicator
back from the fan. The fan status LED is driven by the smart fan control board.
Bulk Power Supply Cooling
Cooling for the bulk power supplies is provided by two (2) 60mm fans contained within each BPS. Air flows
into the front of the BPS and is exhausted out of the top of the power supply though upward facing vents near
the rear of the supply. The air is then ducted out of the rear of the chassis with minimal leakage into the cell
airflow plenum.