Chapter 3: Modem Information; About Built-In Modems; Connecting Your Modem To The Telephone Network; Types Of Built-In Modems - IBM Aptiva Hardware Handbook

About built-in modems

Some IBM Aptiva PCs have a built-in modem (modula-
tor-demodulator). Using a telephone network, a modem
allows your computer to communicate with other com-
puters or fax machines.
This chapter includes important information about con-
necting your modem to the telephone network and
operating your modem. You'll find useful tips that will
help you:
•
Use the Auto Answer feature with your modem
communications software
•
Use the telephone with your modem
We've also included a section about how modems work
to help you understand the problems you may encoun-
ter as you use your modem.
Connecting your modem to the
telephone network
Modems are designed to operate over the public
switched telephone network (PSTN or PSN). This is an
analog network commonly used by most households
and businesses. Connect the modem to an analog net-
Modem information
work only. If you are not sure about your telephone line,
contact your local telephone company.
• Excessive voltages can occur on telephone lines,
especially during lightning storms. To avoid any
possible damage to sensitive electronic parts,
unplug the computer and the telephone cords
during such storms.
Warning!
• Some businesses, schools, and buildings have
digital telephone systems, known as digital pri-
vate branch exchange (PBX) systems. These sys-
tems do not work with the modem. Connecting
your modem to a digital telephone system may
damage the modem.

Types of built-in modems

Most IBM Aptiva PCs purchased in the U.S. and Canada
that have built-in modems use one of the modems listed
below. The modem you have depends on your com-
puter's model and is shown on the box your computer
came in.
•
2400 bps data modem with 9600 bps send fax
and 4800 receive fax capabilities:This modem is
GVC F-9424H/R1; it supports Class 1 fax commands.
•
14,400 bps data modem with 14,400 bps send
and receive fax capability:This modem is GVC
F-1114HV/R6; it supports Class 2 fax commands and
V.42bis.
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