SPSH4 Server SystemTechnical Product Specification
Revision 1.11
Intel reference number 10736
83
7.3 Fan Distribution Board
The SPSH4 fan distribution board (FDB) provides power, speed control, tachometer monitoring,
and presence detect for the six system fans. The fan board snaps into the chassis fan baffle
part and does not require any screws to secure it.
The fan board is populated with two 80mm fans and two dual 120mm fan banks (two 120mm
fans grouped together to form the fan bank).
Amber LEDs on the fan board indicate a fan bank fault condition. These LEDs can be viewed
when the chassis front top cover is removed. Fan bank fault condition is generated by server
management from either a missing fan presence signal or from too slow of a fan tachometer
reading.
The speed of the system fans is controlled by pulse width modulation (PWM) of power. PWM
control of fan speed is implemented by toggling fan power b12V and +5V power rails.
This is done via a server management control signal input to a power FET. In the event of a
fault or over temperature condition, only +12V power is applied to all fans thus providing
maximum fan speed and cooling capability. In addition, fan power is fused to improved system
availability in the event of a fan fault.
7.3.1 Board
Layout
Figure 29: Fan Board Layout
7.3.2 Connector
Pinouts
Table 74: Power Connector (P5)
Pin
Signal
Pin
Signal
1 +12V
4 +12V
2
No connection
5
No connection
3 GND
6 GND
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