Acer TravelMate 4750 - Manual (Page 57)

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Expanding through options
Your notebook PC offers you a complete mobile computing experience.
Connectivity options
Ports allow you to connect peripheral devices to your computer as you would
with a desktop PC. For instructions on how to connect different external devices
to the computer, read the following section.
Fax/data modem (only for certain models)
Your computer has a built-in V.92 56 Kbps fax/data modem 
(only for certain models).
Warning! This modem port is not compatible with digital phone
lines. Plugging this modem into a digital phone line will damage
the modem.
To use the fax/data modem port, connect a phone cable from the modem port
to a telephone jack.
Warning! Please make sure that the cable you use is appropriate
for the country in which you are working.