HP 4310s - ProBook - Core 2 Duo 2.1 GHz - Network); RJ-45 (Network)

Connector pin assignments
Maintenance and Service Guide 9–5
RJ-45 (network)
Pin Signal
1 Transmit +
2 Transmit -
3 Receive +
4 Unused
5 Unused
6 Receive -
7 Unused
8 Unused