User guide

1 Introduction

Introduction

Congratulations on your purchase of the MultiModemZDX or the

MultiModemZDXV modem. You have acquired one of the finest intelligent data/fax

or voice/data/fax modems available today from one of the world’s oldest modem

manufacturers: Multi-Tech Systems, Inc. This manual will help you install,

configure, test, and use your modem.

Product Description

The MultiModemZDX and MultiModemZDXV modems incorporate the K56flex

™

and V.90 protocols, both of which enable Internet connections at data rates up to 56K

bps over standard phone lines. These protocols are able to send data downstream to

your computer at high speeds by taking advantage of the fact that data on the phone

network normally is converted from digital to analog only once before it reaches your

modem. Upstream transmissions and transmissions between client modems have a

maximum data rate of 33.6K bps. Line conditions may cause modems to connect at

speeds lower than the stated data rate maximums.

The MultiModemZDX and MultiModemZDXV modems offer interactive automatic

dialing and command mode configuration. You can store four command lines or

phone numbers of up to 31 characters each in the modem’s nonvolatile memory. The

modem pulse-dials or tone-dials, and recognizes dial tones and busy signals for

reliable call-progress detection. It can also detect AT&T calling card tones. It is FCC-

registered for connection to phone networks without notification to the phone

company.

Features

General Features

• Complies with major ITU-T, TIA, and EIA international standards to ensure

compatibility with other modems.

• Uses DTMF and tone detection to distinguish data and fax calls when used

with software that supports these features.

• Supports serial port speeds to 230.4K bps with compatible serial ports.

• Supports Caller ID (North American versions only).

Data Features

• Supports ITU-T V.90 and K56flex

speeds plus 33.6K, 31.2K, 28.8K, 26.4K,

24K, 21.6K, 19.2K, 16.8K, 14.4K, 12K, 9.6K, 7.2K, 4.8K, 2.4K, 1.2K, and 0–300

bps.

Note: Under the 56K bps standards, you can asymmetrically download data

from an ISP at speeds up to 53K bps, but upload only at speeds up to 33.6K bps.

Client-to-client operation is also limited to 33.6K bps.