Intel Desktop Board DG33BU Technical Product Specification
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2.2.2.1 Signal Tables for the Connectors and Headers

Table 11. Serial ATA Connectors

Pin Signal Name
1 Ground
2 TXP
3 TXN
4 Ground
5 RXN
6 RXP
7 Ground

Table 12. Chassis Intrusion Header

Pin Signal Name
1 Intruder
2 Ground

Table 13. Serial Port Header

Pin Signal Name Pin Signal Name
1 DCD 2 RXD#
3 TXD# 4 DTR
5 Ground 6 DSR
7 RTS 8 CTS
9 RI 10 Key (no pin)

Table 14. Front and Rear Chassis Fan Headers

Pin Signal Name
1 Control
2 +12 V
3 Tach

Table 15. Processor Fan Header

Pin Signal Name
1 Ground
2 +12 V
3 FAN_TACH
4 FAN_CONTROL