US Robotics 56K SERIAL CONTROLLER FAXMODEM Quick Installation Manual page 7

English
C a u t i o n : Use an analogue phone line only. The modem will be damaged if
you connect it to a digital phone line.
Most office phones are wired through digital lines. If you do not
know whether your phone line is analogue or digital, consult your
telephone service provider or building facilities department.
3. Use the provided telephone cord to connect the phone jack on the modem
an analogue telephone wall jack.
5