Connecting To Your Phone; Dial-Up Or Leased Line; Chapter Two - Modem And Fax Basics; What Is A Modem - ZyXEL Communications U-1496 series User Manual

Communication software controls the modem connected to the
computer and directs data to and from the modem. For most cases
in the PC environment, the modem is used in an asynchronous mode
and the software controls the modem by the AT commands. ZyXEL
modems support the extended AT command set and are compatible
with most communication software packages. However, there are
some unique features in the ZyXEL modem and there are a few
unique commands to control them. Some communication packages
need a "modem data file" to tell it which commands and features
the modem supports. The floppy disk included with your modem
package features sample data files for some popular communication
software packages.

CONNECTING TO YOUR PHONE

If you would like to use a single phone line for voice and
modem connections, remove your phone cable from the RJ11 junction
box and plug one end of the RJ11 cable (supplied with modem) into
the socket on the phone, then plug the other end of the cable to
the rear panel of the modem labeled "DIAL-UP LINE" or "WALL".
Finish by plugging in your phone cable to the rear panel of the
modem labeled "PHONE". Please refer to the illustration in Fig.
3-3.

DIAL-UP OR LEASED LINE

The U-1496E and U-1496B can connect to 2-wire dial-up or leased
lines only. The U-1496 and U-1496R offer you a choice of
connecting to 2-wire dial-up line (more commonly known as public
lines) and 2/4-wire leased lines. To use the U-1496 on a leased
line, you must order and install a USOC JM8 jack. You must also
specify 4-wire operation without TEK leads for the wiring option.
When setting up a pair of modems for leased line point-to-point
operation, one must be configured for originate mode and the
other for answer mode. Both RJ11C and JM8 cables are supplied for
your convenience.

Chapter Two - MODEM AND FAX BASICS

This chapter is intended for those who want to know the details behind modem and fax
operations; what's going on behind the scenes. In addition to basic modem and fax terminology,
this chapter helps users understand and use the available features. Experienced modem and
fax users may wish to skip this chapter.

WHAT IS A MODEM

Modem is a compound word of MOdulator and DEModulator. A modem is
used for computer communications. Refer to Fig. 2.1 for a
standard modem setup and application. A modem translates computer
data to analog signals (modulation) that can travel through the