Specifications

Section 4.4 ADSL ATM UIG Total Access 600 Series System Manual

6. VOICE OVER DSL OVERVIEW

Voice over DSL (VoDSL) refers to providing toll quality voice access to the Public Switched Telephone

Network (PSTN) over twisted copper pair using DSL. Data can be combined with multiple voice lines over

a single medium via DSL, thus yielding many advantages over traditional TDM technologies.

Traditional TDM technologies are limited by statically allocating bandwidth. DSL overcomes this by

providing a large bandwidth and utilizing other technologies, such as ATM, to dynamically assign

bandwidth as it is needed. Because of this, the user is able to add voice and data connections over a DSL

line with flexibility and ease.

7. VOICE OVER ATM OVERVIEW

Voice over ATM is the technology used to transmit voice conversations over a data network using

Asynchronous Transfer Mode (ATM). There are several potential benefits to moving voice over a data

network using ATM. First, the small, fixed-length cells require lower processing overhead. Second, these

small, fixed-length cells allow higher transmission speeds than traditional packet switching methods.

ATM allocates bandwidth on demand, making it suitable for high-speed connection of voice, data, and

video services. Conventional networks carry data in a synchronous manner. Because empty slots are

circulating even when the link is not needed, network capacity is wasted. ATM automatically adjusts the

network capacity to meet the system needs.

8. VOICE OVER DSL APPLICATION

The Total Access 600 connects to a DSLAM via DSL and ATM. The Total Access 600 has a built in echo

canceller that provides G.165 echo cancellation. The module can automatically detect ADPCM and enable

it as needed.

Figure 23 shows a typical VoDSL application. The Total Access 600 connects to the ATM network, via a

DSLAM, to provide both voice and high speed data from a single platform.