Intel SR2500 Fiche technique Page 36

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Cooling Subsystem Intel® Server System SR2500AL
Revision – 1.00
Intel order number D31980-004
24
Table 17 Redundant Fan Connector Pin Assingment
Pin Signal Name Description
1 Tachometer B Reserved, unused by redundant fan
2 PWM Fan speed control signal
3 12V Power for fan
4 12V Power for fan
5 Tachometer A Fan RPM sensor output
Two pulses per revolution for the 80mm fan
Four pulses per revolution for the 60mm fan
6 Return Return path to ground
7 Return Return path to ground
8 Fan Presence Detection if fan is installed in system
9 LED Cathode LED in fan
10 LED Anode Reserved, unused by the redundant fan
The system fans are hot-pluggable and do not have any cable connections. They mate directly
to the fan module. The system fan module plugs into headers on the mid-plane board
according the following diagram.
AF000049
4
2
3
1
6
5
Figure 18. Redudant Fan Header Assignments on Mid-plane
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