
Introduction
Chapter 1
Introduction
Overview
The Netopia 4753 Voice/Data Integrated Access Devices (IADs) make it possible for small businesses to take advantage of the advanced communications technologies previously limited to larger organizations. By integrating multiple voice connections and
The Netopia 4753 G.SHDSL Integrated Access Device combines a complete telephone system with a
This section covers the following topics:
■“Features and Capabilities” on page
■“How to Use This Guide” on page
Features and Capabilities
Office telephone systems are commonly one of two types, PBX (Private Branch Exchange) or Centrex (Central Office Exchange). Technically, Centrex is a subset of PBX.
PBX users share a certain number of outside lines for making telephone calls external to the PBX. Most
Centrex is a newer variation on the PBX. It is a PBX with all switching occurring at a local telephone office instead of at the company's premises. Typically, the telephone company owns and manages all the communications equipment necessary to implement the PBX and then sells various services to the company.
Small- to
At the phone company's central office, where all the big switch gear is, there are two kinds of switches for the two kinds of services, voice and data. The voice switch is called a Voice Gateway and the data switch is called a Digital Subscriber Line Access Multiplexer (DSLAM) or access concentrator. Both the voice and data signals are concentrated at the DSLAM and forwarded either to a data router or to the Voice Gateway. Both kinds of switches are manufactured by a variety of companies. The IAD must be capable of communicating with a wide array of possible combinations of Voice Gateways and DSLAMs.