HP ProBook 4520s Notebook PC and HP ProBook 4720s Notebook PC - Maintenance and Service Guide

RJ-45 (network)
Pin Signal
1 Transmit +
2 Transmit -
3 Receive +
4Unused
5Unused
6 Receive -
7Unused
8Unused
Universal Serial Bus
Pin Signal
1 +5 VDC
2 Data -
3 Data +
4Ground
154 Chapter 8 Connector pin assignments