Technical Product Specification

Intel® Server System SR2625UR TPS Cooling Subsystem
Revision 1.8 Intel order number E46130-010
39
Table 24. Redundant Fan Connector Pin Assingment
Pin
Signal Name
Description
1
Tachometer B
Reserved, unused by redundant fan
2
PWM
Fan speed control signal
3
12 V
Power for fan
4
12 V
Power for fan
5
Tachometer A
Fan RPM sensor output
Two pulses per revolution for the 80-mm fan
Four pulses per revolution for the 60-mm 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 midplane board as shown
in the following figure.
Figure 20. Redundant Fan Header Assignments on Midplane