Internal Disk Drive Led Connection; Table A-33 Processor Fan Connector #3 (J4A1); Table A-34 Processor Fan Connector #4 (J4C1); Table A-35 Internal Disk Drive Led Connector - Silicon Graphics 1450 Maintenance Manual

A: Technical Reference

Internal Disk Drive LED Connection

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Table A-33 describe the processor fan connector #3 (J4A1).
Table A-33 Processor Fan Connector #3 (J4A1)
Pin Signal Type
1 Ground Power
2 12V Power
3 Fan Tach Out
Table A-34 describe the processor fan connector #4 (J4C1).
Processor Fan Connector #4 (J4C1)
Table A-34
Pin Signal Type
1 Ground Power
2 12V Power
3 Fan Tach Out
Table A-35 shows the cable pinout assignment for the internal disk drive LED connector.
Table A-35 Internal Disk Drive LED Connector
Pin Signal
1 NC
2 Activity signal
3 Activity signal
4 NC
Description
GROUND is the power supply ground
Power supply 12 V
FAN_TACH signal is connected to the BMC to monitor the
FAN speed
Description
GROUND is the power supply ground
Power supply 12 V
FAN_TACH signal is connected to the BMC to monitor the
FAN speed
Description
No connect
5 V, high true activity signal
Same as pin 2 (Shorted to pin 2)
No connect
007-4276-001