Acer Aspire 1350 - Manual (Page 34)

Getting familiar with your computer 24
English
Fax/data modem
Your computer features a built-in fax/data modem, enabling you to
communicate over a phone line. This means that you can connect to
the Internet via a dialup account with an ISP, log in to your network
from a remote location, or send faxes.
Warning: Your modem is not compatible with digital phone
lines. Plugging the computer into a digital phone system
will damage the modem.
To use the fax/data modem, plug a phone cable into your computer's
modem jack, and then connect the other end to a telephone jack.