Dell Latitude X300 - Manual (Page 35)

IEEE 1394 Connector
USB Connector 2.0 (2)
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3 TXDA 8 CTS*
4 DTR* 9 RI*
5 GND
1 TPB-
2 TPB+
3 TPA-
4 TPA+
Pin Signal
1 VCC
2 Data-
3 Data+
4 GND