Sony VGN-SR490DDB - Manual (Page 57)

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Using Your VAIO Computer >
Using the Network (LAN)
!
Do not plug a telephone cable into the network (Ethernet) port on your computer.
If the network (Ethernet) port is connected to one of the telephone lines mentioned below, high electric current to the port may cause damage,
overheating, or fire.
- Home (intercom speakerphone) or business-use telephone lines (multi-line business telephone)
- Public telephone subscriber line
- Private branch exchange (PBX)