Apple PowerBook G3 - Manual (Page 30)

3 Plug your modem into a working phone line.
4 Follow instructions for setting up your modem with the communications software you
are using.
WARNING When you connect a telephone line to your modem, make
certain that the phone line is the standard (analog) residential line, not a
digital line. Connecting a digital line to your modem card could damage it.
30 Chapter 2