Panasonic Toughbook CF-52ELNBD2M Reference Manual page 59

Modem
Connecting the Internal Modem with a Telephone Jack
CAUTION
Use a surge protector since the modem may be damaged by a sudden high voltage surge that may occur in the event
of a lightning strike.
1
Open the cover (A), and connect the computer and the
telephone jack (B) using the telephone cable
(included) (C).
Hold the cable so that the shape of the connector (D) matches the
port, and insert fully until it clicks.
2
Click (Start) - [Control Panel] - [Connect to the Inter-
net] - [Dial-up] and change the settings as necessary.
NOTE
Do not enter sleep or hibernation during communications.
To remove the cable, press and hold the lever and pull out.
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A