HP Compaq Presario V5000 CTO Notebook PC - Manual (Page 128)

Connecting the modem cable
WARNING! To reduce the risk of electric shock, fire, or damage to the equipment, do not
plug a modem or telephone cable into the RJ-45 (network) jack.
To connect a modem cable:
1. Plug the modem cable into the modem jack (1) on the computer.
2. Plug the modem cable into the RJ-11 telephone wall jack (2).
118 Chapter 10 Modem and Local Area Network ENWW