Chapter 1: Introduction; Overview - AT&T 7400B Plus User Manual

DEFINITY Communications System
7400B Plus Data Module
User´s Guide

CHAPTER 1: INTRODUCTION

OVERVIEW

This chapter discusses the basic operating features of the 7400B
Plus and describes the external indicators and connectors.
The 7400B Plus is a new version of the 7400B Data Module. It is
fully compatible with the 7400B and supports all of its
functionality and applications. In addition, the 7400B Plus has the
following benefits:
the ability to dial voice calls from your terminal device, and
enhanced support for calls that utilize higher speed modems
(9600 V.32 modems) in a modem pool.
Congratulations on the addition of the AT&T 7400B Plus.
Following our tradition of excellent quality and high reliability,
we have designed this new 7400B Plus with the latest advances in
telecommunications technology.
The 7400B Plus is a full-duplex asynchronous, Hayes Compatible
data module. It provides integrated voice-data communications
at the desktop over standard twisted pair wiring. At the desk, the
7400B Plus provides asynchronous communication speeds
ranging from 300 bps to 19.2 Kbps. The 7400B Plus's ability to
emulate Hayes compatible modems, makes it compatible with the
many standard PC communications packages that use Hayes
Command sets. In addition, the 7400B Plus provides a voice dial
capability that allows you to initiate voice calls from a PC using
industry standard "auto-dialer" PC communications packages.
The 7400B Plus is a data service link between a Data Terminal
Equipment (DTE) device and the following AT&T digital PBX
equipment:
DEFINITY Communications System Generic 1
DEFINITY Communications System Generic 2
System 75
System 85
Note: Unless a specific DTE device is intended, the words
terminal device shall be used throughout this guide to
represent any applicable DTE device, including a dumb
terminal, a printer, a plotter, or a personal computer (PC)
with an appropriate PC communications package.
CHAPTER 1: INTRODUCTION
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