Specifications

Baseboard Connectors
007-4276-001 129
The baseboard only supports monitoring a total of eight tachometer fan inputs. The front
panel connector provides connections to all eight tachometer fan inputs. The tachometer
signals from these four processor fan connectors are connected to the same tachometer
fan signals FAN_TACH(4), FAN_TACH(5), FAN_TACH(6), and FAN_TACH(7)
providedonthefrontpanelconnectorJ9E3.Therefore,makesurethatonlyone
connection is used at any given time.
Note: The type of connector (in, out, in/out, power, ground) indicated in the following
tables is described from the perspective of the baseboard.
Table A-31 describes the processor fan connector #1 (J3C1).
Table A-32 describes the processor fan connector #2 (J3A1).
Table A-31 Processor Fan Connector #1 (J3C1)
Pin Signal Type Description
1 Ground power GROUND is the power supply ground
2 12V power Power supply 12 V
3 Fan Tach Out FAN_TACH signal is connected to the BMC to monitor the
FAN speed
Table A-32 Processor Fan Connector #2 (J3A1)
Pin Signal Type Description
1 Ground power GROUND is the power supply ground
2 12V power Power supply 12 V
3 Fan Tach Out FAN_TACH signal is connected to the BMC to monitor the
FAN speed